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--- old/usr/src/cmd/zic/northamerica
+++ new/usr/src/cmd/zic/northamerica
1 1 # This file is in the public domain, so clarified as of
2 2 # 2009-05-17 by Arthur David Olson.
3 3
4 4 # also includes Central America and the Caribbean
5 5
6 6 # This file is by no means authoritative; if you think you know better,
7 7 # go ahead and edit the file (and please send any changes to
8 8 # tz@iana.org for general use in the future). For more, please see
9 9 # the file CONTRIBUTING in the tz distribution.
10 10
11 11 # From Paul Eggert (1999-03-22):
12 12 # A reliable and entertaining source about time zones is
13 13 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
14 14
15 15 ###############################################################################
16 16
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17 17 # United States
18 18
19 19 # From Paul Eggert (1999-03-31):
20 20 # Howse writes (pp 121-125) that time zones were invented by
21 21 # Professor Charles Ferdinand Dowd (1825-1904),
22 22 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
23 23 # His pamphlet "A System of National Time for Railroads" (1870)
24 24 # was the result of his proposals at the Convention of Railroad Trunk Lines
25 25 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
26 26 # but in 1872-05 he moved the proposed origin to Greenwich.
27 -# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
28 -# and the most of the country soon followed suit.
29 27
28 +# From Paul Eggert (2016-09-21):
29 +# Dowd's proposal left many details unresolved, such as where to draw
30 +# lines between time zones. The key individual who made time zones
31 +# work in the US was William Frederick Allen - railway engineer,
32 +# managing editor of the Travelers' Guide, and secretary of the
33 +# General Time Convention, a railway standardization group. Allen
34 +# spent months in dialogs with scientific and railway leaders,
35 +# developed a workable plan to institute time zones, and presented it
36 +# to the General Time Convention on 1883-04-11, saying that his plan
37 +# meant "local time would be practically abolished" - a plus for
38 +# railway scheduling. By the next convention on 1883-10-11 nearly all
39 +# railroads had agreed and it took effect on 1883-11-18 at 12:00.
40 +# That Sunday was called the "day of two noons", as the eastern parts
41 +# of the new zones observed noon twice. Allen witnessed the
42 +# transition in New York City, writing:
43 +#
44 +# I heard the bells of St. Paul's strike on the old time. Four
45 +# minutes later, obedient to the electrical signal from the Naval
46 +# Observatory ... the time-ball made its rapid descent, the chimes
47 +# of old Trinity rang twelve measured strokes, and local time was
48 +# abandoned, probably forever.
49 +#
50 +# Most of the US soon followed suit. See:
51 +# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
52 +# http://dx.doi.org/10.2307/3105430
53 +
30 54 # From Paul Eggert (2005-04-16):
31 55 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
32 56 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
33 57
34 58 # From Paul Eggert (2006-03-22):
35 59 # A good source for time zone historical data in the US is
36 60 # Thomas G. Shanks, The American Atlas (5th edition),
37 61 # San Diego: ACS Publications, Inc. (1991).
38 62 # Make sure you have the errata sheet; the book is somewhat useless without it.
39 63 # It is the source for most of the pre-1991 US entries below.
40 64
41 65 # From Paul Eggert (2001-03-06):
42 66 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
43 67 # in his whimsical essay "An Economical Project for Diminishing the Cost
44 68 # of Light" published in the Journal de Paris (1784-04-26).
45 69 # Not everyone is happy with the results:
46 70 #
47 71 # I don't really care how time is reckoned so long as there is some
48 72 # agreement about it, but I object to being told that I am saving
49 73 # daylight when my reason tells me that I am doing nothing of the kind.
50 74 # I even object to the implication that I am wasting something
51 75 # valuable if I stay in bed after the sun has risen. As an admirer
52 76 # of moonlight I resent the bossy insistence of those who want to
53 77 # reduce my time for enjoying it. At the back of the Daylight Saving
54 78 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
55 79 # to push people into bed earlier, and get them up earlier, to make
56 80 # them healthy, wealthy and wise in spite of themselves.
57 81 #
58 82 # -- Robertson Davies, The diary of Samuel Marchbanks,
59 83 # Clarke, Irwin (1947), XIX, Sunday
60 84 #
61 85 # For more about the first ten years of DST in the United States, see
62 86 # Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint
63 87 # (Carnegie Library of Pittsburgh, 1927).
64 88 # http://www.clpgh.org/exhibit/dst.html
65 89 #
66 90 # Shanks says that DST was called "War Time" in the US in 1918 and 1919.
67 91 # However, DST was imposed by the Standard Time Act of 1918, which
68 92 # was the first nationwide legal time standard, and apparently
69 93 # time was just called "Standard Time" or "Daylight Saving Time".
70 94
71 95 # From Arthur David Olson:
72 96 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
73 97 # See, for example, the front page of the Saturday, 1974-10-26
74 98 # and Sunday, 1974-10-27 editions of the Washington Post.
75 99
76 100 # From Arthur David Olson:
77 101 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
78 102 # Daylight Saving Time in the US was by local option, except during wartime.
79 103
80 104 # From Arthur David Olson (2000-09-25):
81 105 # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
82 106 # In the introduction, Oboler spoke of "Eastern Peace Time."
83 107 # An AltaVista search turned up:
84 108 # http://rowayton.org/rhs/hstaug45.html
85 109 # "When the time is announced over the radio now, it is 'Eastern Peace
86 110 # Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
87 111 # (August 1945) by way of confirmation.
88 112
89 113 # From Joseph Gallant citing
90 114 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
91 115 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
92 116 # to switch to London for Attlee's address, but the American people
93 117 # never got to hear his speech live. According to one press account,
94 118 # CBS' Bob Trout was first to announce the word of Japan's surrender,
95 119 # but a few seconds later, NBC, ABC and Mutual also flashed the word
96 120 # of surrender, all of whom interrupting the bells of Big Ben in
97 121 # London which were to precede Mr. Attlee's speech.
98 122
99 123 # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
100 124 # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
101 125 #
102 126 # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
103 127 # Any announcement from Asia would reach St. John's New York newsroom on a
104 128 # wire service teletype machine, which had prescribed signals for major news.
105 129 # Associated Press, for example, would ring five bells before spewing out
106 130 # typed copy of an important story, and 10 bells for news "of transcendental
107 131 # importance."
108 132 #
109 133 # On Aug. 14, stalling while talking steadily into the NBC networks' open
110 134 # microphone, St. John heard five bells and waited only to hear a sixth bell,
111 135 # before announcing confidently: "Ladies and gentlemen, World War II is over.
112 136 # The Japanese have agreed to our surrender terms."
113 137 #
114 138 # He had scored a 20-second scoop on other broadcasters.
115 139
116 140 # From Arthur David Olson (2005-08-22):
117 141 # Paul has been careful to use the "US" rules only in those locations
118 142 # that are part of the United States; this reflects the real scope of
119 143 # U.S. government action. So even though the "US" rules have changed
120 144 # in the latest release, other countries won't be affected.
121 145
122 146 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
123 147 Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
124 148 Rule US 1918 1919 - Oct lastSun 2:00 0 S
125 149 Rule US 1942 only - Feb 9 2:00 1:00 W # War
126 150 Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
127 151 Rule US 1945 only - Sep lastSun 2:00 0 S
128 152 Rule US 1967 2006 - Oct lastSun 2:00 0 S
129 153 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
130 154 Rule US 1974 only - Jan 6 2:00 1:00 D
131 155 Rule US 1975 only - Feb 23 2:00 1:00 D
132 156 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
133 157 Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
134 158 Rule US 2007 max - Mar Sun>=8 2:00 1:00 D
135 159 Rule US 2007 max - Nov Sun>=1 2:00 0 S
136 160
137 161 # From Arthur David Olson, 2005-12-19
138 162 # We generate the files specified below to guard against old files with
139 163 # obsolete information being left in the time zone binary directory.
140 164 # We limit the list to names that have appeared in previous versions of
141 165 # this time zone package.
142 166 # We do these as separate Zones rather than as Links to avoid problems if
143 167 # a particular place changes whether it observes DST.
144 168 # We put these specifications here in the northamerica file both to
145 169 # increase the chances that they'll actually get compiled and to
146 170 # avoid the need to duplicate the US rules in another file.
147 171
148 172 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
149 173 Zone EST -5:00 - EST
150 174 Zone MST -7:00 - MST
151 175 Zone HST -10:00 - HST
152 176 Zone EST5EDT -5:00 US E%sT
153 177 Zone CST6CDT -6:00 US C%sT
154 178 Zone MST7MDT -7:00 US M%sT
155 179 Zone PST8PDT -8:00 US P%sT
156 180
157 181 # From Bob Devine (1988-01-28):
158 182 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
159 183 # old new
160 184 # Pacific Standard Time(PST) -same-
161 185 # Yukon Standard Time(YST) -same-
162 186 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
163 187 # Nome Standard Time (NT) Bering Standard Time (BST)
164 188 #
165 189 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
166 190 # The YST zone now covers nearly all of the state, AHST just part
167 191 # of the Aleutian islands. No DST.
168 192
169 193 # From Paul Eggert (1995-12-19):
170 194 # The tables below use 'NST', not 'NT', for Nome Standard Time.
171 195 # I invented 'CAWT' for Central Alaska War Time.
172 196
173 197 # From U. S. Naval Observatory (1989-01-19):
174 198 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
175 199 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
176 200 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
177 201 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
178 202 # USA MOUNTAIN 7 H BEHIND UTC DENVER
179 203 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
180 204 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
181 205 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
182 206 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
183 207 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
184 208 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
185 209 # USA " 9 H BEHIND UTC APR 3 - OCT 30
186 210 # USA HAWAII 10 H BEHIND UTC
187 211 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
188 212
189 213 # From Arthur David Olson (1989-01-21):
190 214 # The above dates are for 1988.
191 215 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
192 216 # no DST in Samoa, and the claim that there is DST in Alaska and the
193 217 # Aleutians.
194 218
195 219 # From Arthur David Olson (1988-02-13):
196 220 # Legal standard time zone names, from United States Code (1982 Edition and
197 221 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
198 222 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
199 223 # took effect), as explained in sections 263 and 261:
200 224 # (none)
201 225 # United States standard eastern time
202 226 # United States standard mountain time
203 227 # United States standard central time
204 228 # United States standard Pacific time
205 229 # (none)
206 230 # United States standard Alaska time
207 231 # (none)
208 232 # Next, names from 1967-04-01 until 1983-11-30 (the date for
209 233 # public law 98-181):
210 234 # Atlantic standard time
211 235 # eastern standard time
212 236 # central standard time
213 237 # mountain standard time
214 238 # Pacific standard time
215 239 # Yukon standard time
216 240 # Alaska-Hawaii standard time
217 241 # Bering standard time
218 242 # And after 1983-11-30:
219 243 # Atlantic standard time
220 244 # eastern standard time
221 245 # central standard time
222 246 # mountain standard time
223 247 # Pacific standard time
224 248 # Alaska standard time
225 249 # Hawaii-Aleutian standard time
226 250 # Samoa standard time
227 251 # The law doesn't give abbreviations.
228 252 #
229 253 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
230 254 # Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time"
231 255 # for time in Guam and the Northern Marianas. See the file "australasia".
232 256 #
233 257 # From Paul Eggert (2015-04-17):
234 258 # HST and HDT are standardized abbreviations for Hawaii-Aleutian
235 259 # standard and daylight times. See section 9.47 (p 234) of the
236 260 # U.S. Government Printing Office Style Manual (2008)
237 261 # http://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf
238 262
239 263 # From Arthur David Olson, 2005-08-09
240 264 # The following was signed into law on 2005-08-08.
241 265 #
242 266 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
243 267 # (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
244 268 # U.S.C. 260a(a)) is amended--
245 269 # (1) by striking "first Sunday of April" and inserting "second
246 270 # Sunday of March"; and
247 271 # (2) by striking "last Sunday of October" and inserting "first
248 272 # Sunday of November'.
249 273 # (b) Effective Date.--Subsection (a) shall take effect 1 year after the
250 274 # date of enactment of this Act or March 1, 2007, whichever is later.
251 275 # (c) Report to Congress.--Not later than 9 months after the effective
252 276 # date stated in subsection (b), the Secretary shall report to Congress
253 277 # on the impact of this section on energy consumption in the United
254 278 # States.
255 279 # (d) Right to Revert.--Congress retains the right to revert the
256 280 # Daylight Saving Time back to the 2005 time schedules once the
257 281 # Department study is complete.
258 282
259 283 # US eastern time, represented by New York
260 284
261 285 # Connecticut, Delaware, District of Columbia, most of Florida,
262 286 # Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
263 287 # (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
264 288 # New Hampshire, New Jersey, New York, North Carolina, Ohio,
265 289 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
266 290 # Vermont, Virginia, West Virginia
267 291
268 292 # From Dave Cantor (2004-11-02):
269 293 # Early this summer I had the occasion to visit the Mount Washington
270 294 # Observatory weather station atop (of course!) Mount Washington [, NH]....
271 295 # One of the staff members said that the station was on Eastern Standard Time
272 296 # and didn't change their clocks for Daylight Saving ... so that their
273 297 # reports will always have times which are 5 hours behind UTC.
274 298
275 299 # From Paul Eggert (2005-08-26):
276 300 # According to today's Huntsville Times
277 301 # http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1
278 302 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City
279 303 # in Russell County, Lanett in Chambers County and some towns in Lee County,
280 304 # set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
281 305 # Roberts, city administrator in Phenix City. as saying "We are in the Central
282 306 # time zone, but we do go by the Eastern time zone because so many people work
283 307 # in Columbus."
284 308
285 309 # From Paul Eggert (2014-09-06):
286 310 # Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208
287 311 # says that New York City Hall time was 3 minutes 58.4 seconds fast of
288 312 # Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the
289 313 # nearest second.
290 314
291 315 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
292 316 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
293 317 Rule NYC 1920 only - Oct lastSun 2:00 0 S
294 318 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
295 319 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
296 320 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
297 321 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
298 322 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
299 323 -5:00 US E%sT 1920
300 324 -5:00 NYC E%sT 1942
301 325 -5:00 US E%sT 1946
302 326 -5:00 NYC E%sT 1967
303 327 -5:00 US E%sT
304 328
305 329 # US central time, represented by Chicago
306 330
307 331 # Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
308 332 # Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
309 333 # Washington counties), Illinois, western Indiana
310 334 # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
311 335 # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
312 336 # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
313 337 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
314 338 # western Tennessee, most of Texas, Wisconsin
315 339
316 340 # From Larry M. Smith (2006-04-26) re Wisconsin:
317 341 # http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
318 342 # is currently enforced at the 01:00 time of change. Because the local
319 343 # "bar time" in the state corresponds to 02:00, a number of citations
320 344 # are issued for the "sale of class 'B' alcohol after prohibited
321 345 # hours" within the deviated hour of this change every year....
322 346 #
323 347 # From Douglas R. Bomberg (2007-03-12):
324 348 # Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
325 349 # Statue 175 closer in synch with the US Congress' intent....
326 350 # http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
327 351
328 352 # From an email administrator of the City of Fort Pierre, SD (2015-12-21):
329 353 # Fort Pierre is technically located in the Mountain time zone as is
330 354 # the rest of Stanley County. Most of Stanley County and Fort Pierre
331 355 # uses the Central time zone due to doing most of their business in
332 356 # Pierre so it simplifies schedules. I have lived in Stanley County
333 357 # all my life and it has been that way since I can remember. (43 years!)
334 358 #
335 359 # From Paul Eggert (2015-12-25):
336 360 # Assume this practice predates 1970, so Fort Pierre can use America/Chicago.
337 361
338 362 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
339 363 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
340 364 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
341 365 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
342 366 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
343 367 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
344 368 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
345 369 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
346 370 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
347 371 -6:00 US C%sT 1920
348 372 -6:00 Chicago C%sT 1936 Mar 1 2:00
349 373 -5:00 - EST 1936 Nov 15 2:00
350 374 -6:00 Chicago C%sT 1942
351 375 -6:00 US C%sT 1946
352 376 -6:00 Chicago C%sT 1967
353 377 -6:00 US C%sT
354 378 # Oliver County, ND switched from mountain to central time on 1992-10-25.
355 379 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
356 380 -7:00 US M%sT 1992 Oct 25 2:00
357 381 -6:00 US C%sT
358 382 # Morton County, ND, switched from mountain to central time on
359 383 # 2003-10-26, except for the area around Mandan which was already central time.
360 384 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
361 385 # Officially this switch also included part of Sioux County, and
362 386 # Jones, Mellette, and Todd Counties in South Dakota;
363 387 # but in practice these other counties were already observing central time.
364 388 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
365 389 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
366 390 -7:00 US M%sT 2003 Oct 26 2:00
367 391 -6:00 US C%sT
368 392
369 393 # From Josh Findley (2011-01-21):
370 394 # ...it appears that Mercer County, North Dakota, changed from the
371 395 # mountain time zone to the central time zone at the last transition from
372 396 # daylight-saving to standard time (on Nov. 7, 2010):
373 397 # http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
374 398 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
375 399
376 400 # From Andy Lipscomb (2011-01-24):
377 401 # ...according to the Census Bureau, the largest city is Beulah (although
378 402 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
379 403 # largest city in Mercer County). Google Maps places Beulah's city hall
380 404 # at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
381 405 # of 6h47'07".
382 406
383 407 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
384 408 -7:00 US M%sT 2010 Nov 7 2:00
385 409 -6:00 US C%sT
386 410
387 411 # US mountain time, represented by Denver
388 412 #
389 413 # Colorado, far western Kansas, Montana, western
390 414 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
391 415 # New Mexico, southwestern North Dakota,
392 416 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
393 417 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
394 418 #
395 419 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
396 420 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
397 421 Rule Denver 1920 only - Oct lastSun 2:00 0 S
398 422 Rule Denver 1921 only - May 22 2:00 0 S
399 423 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
400 424 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
401 425 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
402 426 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
403 427 -7:00 US M%sT 1920
404 428 -7:00 Denver M%sT 1942
405 429 -7:00 US M%sT 1946
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406 430 -7:00 Denver M%sT 1967
407 431 -7:00 US M%sT
408 432
409 433 # US Pacific time, represented by Los Angeles
410 434 #
411 435 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
412 436 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
413 437 # north of the Salmon River, and the towns of Burgdorf and Warren),
414 438 # Nevada (except West Wendover), Oregon (except the northern 3/4 of
415 439 # Malheur county), and Washington
440 +
441 +# From Paul Eggert (2016-08-20):
442 +# In early February 1948, in response to California's electricity shortage,
443 +# PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
444 +# causing electric clocks to lose six minutes per day. (This did not change
445 +# legal time, and is not part of the data here.) See:
446 +# Ross SA. An energy crisis from the past: Northern California in 1948.
447 +# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
448 +# 1973-11. http://escholarship.org/uc/item/8x22k30c
416 449 #
450 +# In another measure to save electricity, DST was instituted from 1948-03-14
451 +# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
452 +# the fallback transition earlier. See pages 3-4 of:
453 +# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
454 +#
455 +# In response:
456 +#
457 +# Governor Warren received a torrent of objecting mail, and it is not too much
458 +# to speculate that the objections to Daylight Saving Time were one important
459 +# factor in the defeat of the Dewey-Warren Presidential ticket in California.
460 +# -- Ross, p 25
461 +#
462 +# On December 8 the governor exercised the option, setting the date to January 1
463 +# (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01).
464 +#
465 +# Despite the controversy, in 1949 California voters approved Proposition 12,
466 +# which established DST from April's last Sunday at 01:00 until September's
467 +# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed
468 +# the fall-back date to October's last Sunday. See:
469 +# http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props
470 +# http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props
471 +#
417 472 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
418 -Rule CA 1948 only - Mar 14 2:00 1:00 D
473 +Rule CA 1948 only - Mar 14 2:01 1:00 D
419 474 Rule CA 1949 only - Jan 1 2:00 0 S
420 -Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
475 +Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D
421 476 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
422 477 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
423 478 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
424 479 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
425 480 -8:00 US P%sT 1946
426 481 -8:00 CA P%sT 1967
427 482 -8:00 US P%sT
428 483
429 484 # Alaska
430 485 # AK%sT is the modern abbreviation for -9:00 per USNO.
431 486 #
432 487 # From Paul Eggert (2001-05-30):
433 488 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
434 489 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
435 490 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
436 491 # also a Friday. Include only the time zone part of this transition,
437 492 # ignoring the switch from Julian to Gregorian, since we can't represent
438 493 # the Julian calendar.
439 494 #
440 495 # As far as we know, none of the exact locations mentioned below were
441 496 # permanently inhabited in 1867 by anyone using either calendar.
442 497 # (Yakutat was colonized by the Russians in 1799, but the settlement
443 498 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
444 499 # were nearby inhabitants in some cases and for our purposes perhaps
445 500 # it's best to simply use the official transition.
446 501
447 502 # From Paul Eggert (2014-07-18):
448 503 # One opinion of the early-1980s turmoil in Alaska over time zones and
449 504 # daylight saving time appeared as graffiti on a Juneau airport wall:
450 505 # "Welcome to Juneau. Please turn your watch back to the 19th century."
451 506 # See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01.
452 507 # http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html
453 508 #
454 509 # Steve Ferguson (2011-01-31) referred to the following source:
455 510 # Norris F. Keeping time in Alaska: national directives, local response.
456 511 # Alaska History 2001;16(1-2).
457 512 # http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/
458 513
459 514 # From Arthur David Olson (2011-02-01):
460 515 # Here's database-relevant material from the 2001 "Alaska History" article:
461 516 #
462 517 # On September 20 [1979]...DOT...officials decreed that on April 27,
463 518 # 1980, Juneau and other nearby communities would move to Yukon Time.
464 519 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
465 520 # Pacific Time.
466 521 #
467 522 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
468 523 # Department's September 1979 decision. Juneau and other communities in
469 524 # northern Southeast reverted to Pacific Time on October 26.
470 525 #
471 526 # On October 28 [1983]...the Metlakatla Indian Community Council voted
472 527 # unanimously to keep the reservation on Pacific Time.
473 528 #
474 529 # According to DOT official Joanne Petrie, Indian reservations are not
475 530 # bound to follow time zones imposed by neighboring jurisdictions.
476 531 #
477 532 # (The last is consistent with how the database now handles the Navajo
478 533 # Nation.)
479 534
480 535 # From Arthur David Olson (2011-02-09):
481 536 # I just spoke by phone with a staff member at the Metlakatla Indian
482 537 # Community office (using contact information available at
483 538 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
484 539 # It's shortly after 1:00 here on the east coast of the United States;
485 540 # the staffer said it was shortly after 10:00 there. When I asked whether
486 541 # that meant they were on Pacific time, they said no - they were on their
487 542 # own time. I asked about daylight saving; they said it wasn't used. I
488 543 # did not inquire about practices in the past.
489 544
490 545 # From Arthur David Olson (2011-08-17):
491 546 # For lack of better information, assume that Metlakatla's
492 547 # abandonment of use of daylight saving resulted from the 1983 vote.
493 548
494 549 # From Steffen Thorsen (2015-11-09):
495 550 # It seems Metlakatla did go off PST on Sunday, November 1, changing
496 551 # their time to AKST and are going to follow Alaska's DST, switching
497 552 # between AKST and AKDT from now on....
498 553 # http://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/
499 554
500 555 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
501 556 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
502 557 -8:57:41 - LMT 1900 Aug 20 12:00
503 558 -8:00 - PST 1942
504 559 -8:00 US P%sT 1946
505 560 -8:00 - PST 1969
506 561 -8:00 US P%sT 1980 Apr 27 2:00
507 562 -9:00 US Y%sT 1980 Oct 26 2:00
508 563 -8:00 US P%sT 1983 Oct 30 2:00
509 564 -9:00 US Y%sT 1983 Nov 30
510 565 -9:00 US AK%sT
511 566 Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
512 567 -9:01:13 - LMT 1900 Aug 20 12:00
513 568 -8:00 - PST 1942
514 569 -8:00 US P%sT 1946
515 570 -8:00 - PST 1969
516 571 -8:00 US P%sT 1983 Oct 30 2:00
517 572 -9:00 US Y%sT 1983 Nov 30
518 573 -9:00 US AK%sT
519 574 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
520 575 -8:46:18 - LMT 1900 Aug 20 12:00
521 576 -8:00 - PST 1942
522 577 -8:00 US P%sT 1946
523 578 -8:00 - PST 1969
524 579 -8:00 US P%sT 1983 Oct 30 2:00
525 580 -8:00 - PST 2015 Nov 1 2:00
526 581 -9:00 US AK%sT
527 582 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
528 583 -9:18:55 - LMT 1900 Aug 20 12:00
529 584 -9:00 - YST 1942
530 585 -9:00 US Y%sT 1946
531 586 -9:00 - YST 1969
532 587 -9:00 US Y%sT 1983 Nov 30
533 588 -9:00 US AK%sT
534 589 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
535 590 -9:59:36 - LMT 1900 Aug 20 12:00
536 591 -10:00 - CAT 1942
537 592 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
538 593 -10:00 US CAT/CAPT 1946 # Peace
539 594 -10:00 - CAT 1967 Apr
540 595 -10:00 - AHST 1969
541 596 -10:00 US AH%sT 1983 Oct 30 2:00
542 597 -9:00 US Y%sT 1983 Nov 30
543 598 -9:00 US AK%sT
544 599 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
545 600 -11:01:38 - LMT 1900 Aug 20 12:00
546 601 -11:00 - NST 1942
547 602 -11:00 US N%sT 1946
548 603 -11:00 - NST 1967 Apr
549 604 -11:00 - BST 1969
550 605 -11:00 US B%sT 1983 Oct 30 2:00
551 606 -9:00 US Y%sT 1983 Nov 30
552 607 -9:00 US AK%sT
553 608 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
554 609 -11:46:38 - LMT 1900 Aug 20 12:00
555 610 -11:00 - NST 1942
556 611 -11:00 US N%sT 1946
557 612 -11:00 - NST 1967 Apr
558 613 -11:00 - BST 1969
559 614 -11:00 US B%sT 1983 Oct 30 2:00
560 615 -10:00 US AH%sT 1983 Nov 30
561 616 -10:00 US H%sT
562 617 # The following switches don't quite make our 1970 cutoff.
563 618 #
564 619 # Shanks writes that part of southwest Alaska (e.g. Aniak)
565 620 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
566 621 # and another part (e.g. Akiak) made the same switch five weeks later.
567 622 #
568 623 # From David Flater (2004-11-09):
569 624 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
570 625 # Historic Preservation Commission, provided this information, which
571 626 # suggests that Unalaska deviated from statutory time from early 1967
572 627 # possibly until 1983:
573 628 #
574 629 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
575 630 # "Except for St. Paul and Akutan, Unalaska is the only important
576 631 # location not on Alaska Standard Time. The following resolution was
577 632 # made by William Robinson and seconded by Henry Swanson: Be it
578 633 # resolved that the City of Unalaska hereby goes to Alaska Standard
579 634 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
580 635 # January 14, Alaska Standard Time.) This resolution was passed with
581 636 # three votes for and one against."
582 637
583 638 # Hawaii
584 639
585 640 # From Arthur David Olson (2010-12-09):
586 641 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
587 642 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
588 643 # the article is available at
589 644 # http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
590 645 # and indicates that standard time was adopted effective noon, January
591 646 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
592 647 # saving for the period between the last Sunday of each April and the
593 648 # last Sunday of each September, but less than a month later repealed the
594 649 # act," (page 220), that year-round daylight saving time was in effect
595 650 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
596 651 # when clocks changed) and that clocks were changed by 30 minutes
597 652 # effective the second Sunday of June, 1947 (page 219, with no time of
598 653 # day given for when clocks changed). A footnote for the 1933 changes
599 654 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
600 655 # and Act 163 (approved 21 May 1933)."
601 656
602 657 # From Arthur David Olson (2011-01-19):
603 658 # The following is from "Laws of the Territory of Hawaii Passed by the
604 659 # Seventeenth Legislature: Regular Session 1933," available (as of
605 660 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
606 661 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
607 662 # year, the standard time of this Territory shall be advanced one
608 663 # hour...This Act shall take effect upon its approval. Approved this 26th
609 664 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
610 665 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
611 666 # hereby repealed...This Act shall take effect upon its approval, upon
612 667 # which date the standard time of this Territory shall be restored to
613 668 # that existing immediately prior to the taking effect of said Act 90.
614 669 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
615 670 # of the Territory of Hawaii."
616 671 #
617 672 # Note that 1933-05-21 was a Sunday.
618 673 # We're left to guess the time of day when Act 163 was approved; guess noon.
619 674
620 675 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
621 676 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00
622 677 -10:30 - HST 1933 Apr 30 2:00
623 678 -10:30 1:00 HDT 1933 May 21 12:00
624 679 -10:30 - HST 1942 Feb 9 2:00
625 680 -10:30 1:00 HDT 1945 Sep 30 2:00
626 681 -10:30 - HST 1947 Jun 8 2:00
627 682 -10:00 - HST
628 683 Link Pacific/Honolulu Pacific/Johnston
629 684
630 685 # Now we turn to US areas that have diverged from the consensus since 1970.
631 686
632 687 # Arizona mostly uses MST.
633 688
634 689 # From Paul Eggert (2002-10-20):
635 690 #
636 691 # The information in the rest of this paragraph is derived from the
637 692 # Daylight Saving Time web page
638 693 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
639 694 # maintained by the Arizona State Library, Archives and Public Records.
640 695 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
641 696 # time, but by federal law railroads, airlines, bus lines, military
642 697 # personnel, and some engaged in interstate commerce continued to
643 698 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
644 699 # Gazette says that was the date the law changed, and that 04-01 was
645 700 # the date the state's clocks would change. In 1945 the State of
646 701 # Arizona used standard time all year, again with exceptions only as
647 702 # mandated by federal law. Arizona observed DST in 1967, but Arizona
648 703 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
649 704 #
650 705 # Shanks says the 1944 experiment came to an end on 1944-03-17.
651 706 # Go with the Arizona State Library instead.
652 707
653 708 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
654 709 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
655 710 -7:00 US M%sT 1944 Jan 1 0:01
656 711 -7:00 - MST 1944 Apr 1 0:01
657 712 -7:00 US M%sT 1944 Oct 1 0:01
658 713 -7:00 - MST 1967
659 714 -7:00 US M%sT 1968 Mar 21
660 715 -7:00 - MST
661 716 # From Arthur David Olson (1988-02-13):
662 717 # A writer from the Inter Tribal Council of Arizona, Inc.,
663 718 # notes in private correspondence dated 1987-12-28 that "Presently, only the
664 719 # Navajo Nation participates in the Daylight Saving Time policy, due to its
665 720 # large size and location in three states." (The "only" means that other
666 721 # tribal nations don't use DST.)
667 722 #
668 723 # From Paul Eggert (2013-08-26):
669 724 # See America/Denver for a zone appropriate for the Navajo Nation.
670 725
671 726 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
672 727 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
673 728 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
674 729 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
675 730 # Teton, Twin Falls, Valley, Washington counties, and the southern
676 731 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
677 732 # switched four weeks late in 1974.
678 733 #
679 734 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
680 735 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
681 736 -8:00 US P%sT 1923 May 13 2:00
682 737 -7:00 US M%sT 1974
683 738 -7:00 - MST 1974 Feb 3 2:00
684 739 -7:00 US M%sT
685 740
686 741 # Indiana
687 742 #
688 743 # For a map of Indiana's time zone regions, see:
689 744 # http://en.wikipedia.org/wiki/Time_in_Indiana
690 745 #
691 746 # From Paul Eggert (2007-08-17):
692 747 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
693 748 # with the following exceptions:
694 749 #
695 750 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
696 751 # Vanderburgh, and Warrick counties have been like America/Chicago.
697 752 #
698 753 # - Dearborn and Ohio counties have been like America/New_York.
699 754 #
700 755 # - Clark, Floyd, and Harrison counties have been like
701 756 # America/Kentucky/Louisville.
702 757 #
703 758 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
704 759 # and Switzerland counties have their own time zone histories as noted below.
705 760 #
706 761 # Shanks partitioned Indiana into 345 regions, each with its own time history,
707 762 # and wrote "Even newspaper reports present contradictory information."
708 763 # Those Hoosiers! Such a flighty and changeable people!
709 764 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
710 765 #
711 766 # Other than Indianapolis, the Indiana place names are so nondescript
712 767 # that they would be ambiguous if we left them at the 'America' level.
713 768 # So we reluctantly put them all in a subdirectory 'America/Indiana'.
714 769
715 770 # From Paul Eggert (2014-06-26):
716 771 # https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana
717 772 # says "DOT is relocating the time zone boundary in Indiana to move Starke,
718 773 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
719 774 # Eastern Time Zone to the Central Time Zone.... The effective date of
720 775 # this rule is 2 a.m. EST Sunday, April 2, 2006, which is the
721 776 # changeover date from standard time to Daylight Saving Time."
722 777 # Strictly speaking, this meant the affected counties changed their
723 778 # clocks twice that night, but this obviously was in error. The intent
724 779 # was that 01:59:59 EST be followed by 02:00:00 CDT.
725 780
726 781 # From Gwillim Law (2007-02-10):
727 782 # The Associated Press has been reporting that Pulaski County, Indiana is
728 783 # going to switch from Central to Eastern Time on March 11, 2007....
729 784 # http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
730 785
731 786 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
732 787 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
733 788 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
734 789 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
735 790 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
736 791 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
737 792 -6:00 US C%sT 1920
738 793 -6:00 Indianapolis C%sT 1942
739 794 -6:00 US C%sT 1946
740 795 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
741 796 -5:00 - EST 1957 Sep 29 2:00
742 797 -6:00 - CST 1958 Apr 27 2:00
743 798 -5:00 - EST 1969
744 799 -5:00 US E%sT 1971
745 800 -5:00 - EST 2006
746 801 -5:00 US E%sT
747 802 #
748 803 # Eastern Crawford County, Indiana, left its clocks alone in 1974,
749 804 # as well as from 1976 through 2005.
750 805 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
751 806 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
752 807 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
753 808 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
754 809 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
755 810 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
756 811 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
757 812 -6:00 US C%sT 1951
758 813 -6:00 Marengo C%sT 1961 Apr 30 2:00
759 814 -5:00 - EST 1969
760 815 -5:00 US E%sT 1974 Jan 6 2:00
761 816 -6:00 1:00 CDT 1974 Oct 27 2:00
762 817 -5:00 US E%sT 1976
763 818 -5:00 - EST 2006
764 819 -5:00 US E%sT
765 820 #
766 821 # Daviess, Dubois, Knox, and Martin Counties, Indiana,
767 822 # switched from eastern to central time in April 2006, then switched back
768 823 # in November 2007.
769 824 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
770 825 Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
771 826 Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
772 827 Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
773 828 Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
774 829 Rule Vincennes 1955 only - May 1 0:00 1:00 D
775 830 Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
776 831 Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
777 832 Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
778 833 Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
779 834 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
780 835 Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
781 836 -6:00 US C%sT 1946
782 837 -6:00 Vincennes C%sT 1964 Apr 26 2:00
783 838 -5:00 - EST 1969
784 839 -5:00 US E%sT 1971
785 840 -5:00 - EST 2006 Apr 2 2:00
786 841 -6:00 US C%sT 2007 Nov 4 2:00
787 842 -5:00 US E%sT
788 843 #
789 844 # Perry County, Indiana, switched from eastern to central time in April 2006.
790 845 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
791 846 Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
792 847 Rule Perry 1946 only - Sep lastSun 2:00 0 S
793 848 Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
794 849 Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
795 850 Rule Perry 1955 only - May 1 0:00 1:00 D
796 851 Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
797 852 Rule Perry 1960 only - Oct lastSun 2:00 0 S
798 853 Rule Perry 1961 only - Sep lastSun 2:00 0 S
799 854 Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
800 855 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
801 856 Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
802 857 -6:00 US C%sT 1946
803 858 -6:00 Perry C%sT 1964 Apr 26 2:00
804 859 -5:00 - EST 1969
805 860 -5:00 US E%sT 1971
806 861 -5:00 - EST 2006 Apr 2 2:00
807 862 -6:00 US C%sT
808 863 #
809 864 # Pike County, Indiana moved from central to eastern time in 1977,
810 865 # then switched back in 2006, then switched back again in 2007.
811 866 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
812 867 Rule Pike 1955 only - May 1 0:00 1:00 D
813 868 Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
814 869 Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
815 870 Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
816 871 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
817 872 Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
818 873 -6:00 US C%sT 1955
819 874 -6:00 Pike C%sT 1965 Apr 25 2:00
820 875 -5:00 - EST 1966 Oct 30 2:00
821 876 -6:00 US C%sT 1977 Oct 30 2:00
822 877 -5:00 - EST 2006 Apr 2 2:00
823 878 -6:00 US C%sT 2007 Nov 4 2:00
824 879 -5:00 US E%sT
825 880 #
826 881 # Starke County, Indiana moved from central to eastern time in 1991,
827 882 # then switched back in 2006.
828 883 # From Arthur David Olson (1991-10-28):
829 884 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
830 885 # notes that Starke County switched from Central time to Eastern time as of
831 886 # 1991-10-27.
832 887 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
833 888 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
834 889 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
835 890 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
836 891 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
837 892 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
838 893 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
839 894 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
840 895 -6:00 US C%sT 1947
841 896 -6:00 Starke C%sT 1962 Apr 29 2:00
842 897 -5:00 - EST 1963 Oct 27 2:00
843 898 -6:00 US C%sT 1991 Oct 27 2:00
844 899 -5:00 - EST 2006 Apr 2 2:00
845 900 -6:00 US C%sT
846 901 #
847 902 # Pulaski County, Indiana, switched from eastern to central time in
848 903 # April 2006 and then switched back in March 2007.
849 904 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
850 905 Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
851 906 Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
852 907 Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
853 908 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
854 909 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
855 910 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
856 911 -6:00 US C%sT 1946
857 912 -6:00 Pulaski C%sT 1961 Apr 30 2:00
858 913 -5:00 - EST 1969
859 914 -5:00 US E%sT 1971
860 915 -5:00 - EST 2006 Apr 2 2:00
861 916 -6:00 US C%sT 2007 Mar 11 2:00
862 917 -5:00 US E%sT
863 918 #
864 919 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
865 920 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
866 921 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
867 922 -6:00 US C%sT 1954 Apr 25 2:00
868 923 -5:00 - EST 1969
869 924 -5:00 US E%sT 1973
870 925 -5:00 - EST 2006
871 926 -5:00 US E%sT
872 927
873 928 # Part of Kentucky left its clocks alone in 1974.
874 929 # This also includes Clark, Floyd, and Harrison counties in Indiana.
875 930 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
876 931 Rule Louisville 1921 only - May 1 2:00 1:00 D
877 932 Rule Louisville 1921 only - Sep 1 2:00 0 S
878 933 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
879 934 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
880 935 Rule Louisville 1946 only - Jun 2 2:00 0 S
881 936 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
882 937 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
883 938 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
884 939 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
885 940 -6:00 US C%sT 1921
886 941 -6:00 Louisville C%sT 1942
887 942 -6:00 US C%sT 1946
888 943 -6:00 Louisville C%sT 1961 Jul 23 2:00
889 944 -5:00 - EST 1968
890 945 -5:00 US E%sT 1974 Jan 6 2:00
891 946 -6:00 1:00 CDT 1974 Oct 27 2:00
892 947 -5:00 US E%sT
893 948 #
894 949 # Wayne County, Kentucky
895 950 #
896 951 # From Lake Cumberland LIFE
897 952 # http://www.lake-cumberland.com/life/archive/news990129time.shtml
898 953 # (1999-01-29) via WKYM-101.7:
899 954 # Clinton County has joined Wayne County in asking the DoT to change from
900 955 # the Central to the Eastern time zone.... The Wayne County government made
901 956 # the same request in December. And while Russell County officials have not
902 957 # taken action, the majority of respondents to a poll conducted there in
903 958 # August indicated they would like to change to "fast time" also.
904 959 # The three Lake Cumberland counties are the farthest east of any U.S.
905 960 # location in the Central time zone.
906 961 #
907 962 # From Rich Wales (2000-08-29):
908 963 # After prolonged debate, and despite continuing deep differences of opinion,
909 964 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
910 965 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
911 966 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
912 967 #
913 968 # From Paul Eggert (2001-07-16):
914 969 # The final rule was published in the
915 970 # Federal Register 65, 160 (2000-08-17), pp 50154-50158.
916 971 # http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22
917 972 #
918 973 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
919 974 -6:00 US C%sT 1946
920 975 -6:00 - CST 1968
921 976 -6:00 US C%sT 2000 Oct 29 2:00
922 977 -5:00 US E%sT
923 978
924 979
925 980 # From Rives McDow (2000-08-30):
926 981 # Here ... are all the changes in the US since 1985.
927 982 # Kearny County, KS (put all of county on central;
928 983 # previously split between MST and CST) ... 1990-10
929 984 # Starke County, IN (from CST to EST) ... 1991-10
930 985 # Oliver County, ND (from MST to CST) ... 1992-10
931 986 # West Wendover, NV (from PST TO MST) ... 1999-10
932 987 # Wayne County, KY (from CST to EST) ... 2000-10
933 988 #
934 989 # From Paul Eggert (2001-07-17):
935 990 # We don't know where the line used to be within Kearny County, KS,
936 991 # so omit that change for now.
937 992 # See America/Indiana/Knox for the Starke County, IN change.
938 993 # See America/North_Dakota/Center for the Oliver County, ND change.
939 994 # West Wendover, NV officially switched from Pacific to mountain time on
940 995 # 1999-10-31. See the
941 996 # Federal Register 64, 203 (1999-10-21), pp 56705-56707.
942 997 # http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15
943 998 # However, the Federal Register says that West Wendover already operated
944 999 # on mountain time, and the rule merely made this official;
945 1000 # hence a separate tz entry is not needed.
946 1001
947 1002 # Michigan
948 1003 #
949 1004 # From Bob Devine (1988-01-28):
950 1005 # Michigan didn't observe DST from 1968 to 1973.
951 1006 #
952 1007 # From Paul Eggert (1999-03-31):
953 1008 # Shanks writes that Michigan started using standard time on 1885-09-18,
954 1009 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
955 1010 # that Detroit kept
956 1011 #
957 1012 # local time until 1900 when the City Council decreed that clocks should
958 1013 # be put back twenty-eight minutes to Central Standard Time. Half the
959 1014 # city obeyed, half refused. After considerable debate, the decision
960 1015 # was rescinded and the city reverted to Sun time. A derisive offer to
961 1016 # erect a sundial in front of the city hall was referred to the
962 1017 # Committee on Sewers. Then, in 1905, Central time was adopted
963 1018 # by city vote.
964 1019 #
965 1020 # This story is too entertaining to be false, so go with Howse over Shanks.
966 1021 #
967 1022 # From Paul Eggert (2001-03-06):
968 1023 # Garland (1927) writes "Cleveland and Detroit advanced their clocks
969 1024 # one hour in 1914." This change is not in Shanks. We have no more
970 1025 # info, so omit this for now.
971 1026 #
972 1027 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
973 1028 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
974 1029 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
975 1030 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
976 1031 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
977 1032 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
978 1033 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
979 1034 Zone America/Detroit -5:32:11 - LMT 1905
980 1035 -6:00 - CST 1915 May 15 2:00
981 1036 -5:00 - EST 1942
982 1037 -5:00 US E%sT 1946
983 1038 -5:00 Detroit E%sT 1973
984 1039 -5:00 US E%sT 1975
985 1040 -5:00 - EST 1975 Apr 27 2:00
986 1041 -5:00 US E%sT
987 1042 #
988 1043 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
989 1044 # switched from EST to CST/CDT in 1973.
990 1045 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
991 1046 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
992 1047 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
993 1048 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
994 1049 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
995 1050 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
996 1051 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
997 1052 -6:00 US C%sT 1946
998 1053 -6:00 Menominee C%sT 1969 Apr 27 2:00
999 1054 -5:00 - EST 1973 Apr 29 2:00
1000 1055 -6:00 US C%sT
1001 1056
1002 1057 # Navassa
1003 1058 # administered by the US Fish and Wildlife Service
1004 1059 # claimed by US under the provisions of the 1856 Guano Islands Act
1005 1060 # also claimed by Haiti
1006 1061 # occupied 1857/1900 by the Navassa Phosphate Co
1007 1062 # US lighthouse 1917/1996-09
1008 1063 # currently uninhabited
1009 1064 # see Mark Fineman, "An Isle Rich in Guano and Discord",
1010 1065 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
1011 1066 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
1012 1067
1013 1068 ################################################################################
1014 1069
1015 1070
1016 1071 # From Paul Eggert (2014-10-31):
1017 1072 #
1018 1073 # Unless otherwise specified, the source for data through 1990 is:
1019 1074 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1020 1075 # San Diego: ACS Publications, Inc. (2003).
1021 1076 # Unfortunately this book contains many errors and cites no sources.
1022 1077 #
1023 1078 # Gwillim Law writes that a good source
1024 1079 # for recent time zone data is the International Air Transport
1025 1080 # Association's Standard Schedules Information Manual (IATA SSIM),
1026 1081 # published semiannually. Law sent in several helpful summaries
1027 1082 # of the IATA's data after 1990. Except where otherwise noted,
1028 1083 # IATA SSIM is the source for entries after 1990.
1029 1084 #
1030 1085 # Other sources occasionally used include:
1031 1086 #
1032 1087 # Edward W. Whitman, World Time Differences,
1033 1088 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1034 1089 # which I found in the UCLA library.
1035 1090 #
1036 1091 # William Willett, The Waste of Daylight, 19th edition
1037 1092 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
1038 1093 # [PDF] (1914-03)
1039 1094 #
1040 1095 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1041 1096 # <http://www.jstor.org/stable/1774359>.
1042 1097 #
1043 1098 # See the 'europe' file for Greenland.
1044 1099
1045 1100 # Canada
1046 1101
1047 1102 # From Alain LaBonté (1994-11-14):
1048 1103 # I post here the time zone abbreviations standardized in Canada
1049 1104 # for both English and French in the CAN/CSA-Z234.4-89 standard....
1050 1105 #
1051 1106 # UTC Standard time Daylight saving time
1052 1107 # offset French English French English
1053 1108 # -2:30 - - HAT NDT
1054 1109 # -3 - - HAA ADT
1055 1110 # -3:30 HNT NST - -
1056 1111 # -4 HNA AST HAE EDT
1057 1112 # -5 HNE EST HAC CDT
1058 1113 # -6 HNC CST HAR MDT
1059 1114 # -7 HNR MST HAP PDT
1060 1115 # -8 HNP PST HAY YDT
1061 1116 # -9 HNY YST - -
1062 1117 #
1063 1118 # HN: Heure Normale ST: Standard Time
1064 1119 # HA: Heure Avancée DT: Daylight saving Time
1065 1120 #
1066 1121 # A: de l'Atlantique Atlantic
1067 1122 # C: du Centre Central
1068 1123 # E: de l'Est Eastern
1069 1124 # M: Mountain
1070 1125 # N: Newfoundland
1071 1126 # P: du Pacifique Pacific
1072 1127 # R: des Rocheuses
1073 1128 # T: de Terre-Neuve
1074 1129 # Y: du Yukon Yukon
1075 1130 #
1076 1131 # From Paul Eggert (1994-11-22):
1077 1132 # Alas, this sort of thing must be handled by localization software.
1078 1133
1079 1134 # Unless otherwise specified, the data entries for Canada are all from Shanks
1080 1135 # & Pottenger.
1081 1136
1082 1137 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1083 1138 # 2007-03-01):
1084 1139 # The British Columbia government announced yesterday that it will
1085 1140 # adjust daylight savings next year to align with changes in the
1086 1141 # U.S. and the rest of Canada....
1087 1142 # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1088 1143 # ...
1089 1144 # Nova Scotia
1090 1145 # Daylight saving time will be extended by four weeks starting in 2007....
1091 1146 # http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1092 1147 #
1093 1148 # [For New Brunswick] the new legislation dictates that the time change is to
1094 1149 # be done at 02:00 instead of 00:01.
1095 1150 # http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1096 1151 # ...
1097 1152 # Manitoba has traditionally changed the clock every fall at 03:00.
1098 1153 # As of 2006, the transition is to take place one hour earlier at 02:00.
1099 1154 # http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1100 1155 # ...
1101 1156 # [Alberta, Ontario, Quebec] will follow US rules.
1102 1157 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1103 1158 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1104 1159 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1105 1160 # ...
1106 1161 # P.E.I. will follow US rules....
1107 1162 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1108 1163 # ...
1109 1164 # Province of Newfoundland and Labrador....
1110 1165 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1111 1166 # ...
1112 1167 # Yukon
1113 1168 # http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1114 1169 # ...
1115 1170 # N.W.T. will follow US rules. Whoever maintains the government web site
1116 1171 # does not seem to believe in bookmarks. To see the news release, click the
1117 1172 # following link and search for "Daylight Savings Time Change". Press the
1118 1173 # "Daylight Savings Time Change" link; it will fire off a popup using
1119 1174 # JavaScript.
1120 1175 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1121 1176 # ...
1122 1177 # Nunavut
1123 1178 # An amendment to the Interpretation Act was registered on February 19/2007....
1124 1179 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1125 1180
1126 1181 # From Paul Eggert (2014-10-18):
1127 1182 # H. David Matthews and Mary Vincent's map
1128 1183 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
1129 1184 # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
1130 1185 # contains detailed boundaries for regions observing nonstandard
1131 1186 # time and daylight saving time arrangements in Canada circa 1998.
1132 1187 #
1133 1188 # National Research Council Canada maintains info about time zones and DST.
1134 1189 # http://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html
1135 1190 # http://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5
1136 1191 # Its unofficial information is often taken from Matthews and Vincent.
1137 1192
1138 1193 # From Paul Eggert (2006-06-27):
1139 1194 # For now, assume all of DST-observing Canada will fall into line with the
1140 1195 # new US DST rules,
1141 1196
1142 1197 # From Chris Walton (2011-12-01)
1143 1198 # In the first of Tammy Hardwick's articles
1144 1199 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1145 1200 # she quotes the Friday November 1/1918 edition of the Creston Review.
1146 1201 # The quote includes these two statements:
1147 1202 # 'Sunday the CPR went back to the old system of time...'
1148 1203 # '... The daylight saving scheme was dropped all over Canada at the same time,'
1149 1204 # These statements refer to a transition from daylight time to standard time
1150 1205 # that occurred nationally on Sunday October 27/1918. This transition was
1151 1206 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
1152 1207
1153 1208 # In light of that evidence, we alter the date from the earlier believed
1154 1209 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1155 1210 # than Thursday) in all Canadian rulesets.
1156 1211
1157 1212 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1158 1213 Rule Canada 1918 only - Apr 14 2:00 1:00 D
1159 1214 Rule Canada 1918 only - Oct 27 2:00 0 S
1160 1215 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1161 1216 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1162 1217 Rule Canada 1945 only - Sep 30 2:00 0 S
1163 1218 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1164 1219 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1165 1220 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1166 1221 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1167 1222 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1168 1223
1169 1224
1170 1225 # Newfoundland and Labrador
1171 1226
1172 1227 # From Paul Eggert (2000-10-02):
1173 1228 # Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1174 1229 # but the only part of Labrador that follows the rules is the
1175 1230 # southeast corner, including Port Hope Simpson and Mary's Harbour,
1176 1231 # but excluding, say, Black Tickle.
1177 1232
1178 1233 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1179 1234 Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1180 1235 Rule StJohns 1917 only - Sep 17 2:00 0 S
1181 1236 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1182 1237 Rule StJohns 1919 only - May 5 23:00 1:00 D
1183 1238 Rule StJohns 1919 only - Aug 12 23:00 0 S
1184 1239 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1185 1240 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1186 1241 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1187 1242 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1188 1243 # Pottenger.
1189 1244 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1190 1245 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1191 1246 # Whitman gives the following transitions:
1192 1247 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1193 1248 # but go with Shanks & Pottenger and assume they used Canadian rules.
1194 1249 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1195 1250 # Apr 30 - Sep 24; go with Shanks & Pottenger.
1196 1251 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1197 1252 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1198 1253 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1199 1254 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1200 1255 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1201 1256 # From Paul Eggert (2000-10-02):
1202 1257 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1203 1258 # at 00:01 local time. For now, assume it started in 1987.
1204 1259
1205 1260 # From Michael Pelley (2011-09-12):
1206 1261 # We received today, Monday, September 12, 2011, notification that the
1207 1262 # changes to the Newfoundland Standard Time Act have been proclaimed.
1208 1263 # The change in the Act stipulates that the change from Daylight Savings
1209 1264 # Time to Standard Time and from Standard Time to Daylight Savings Time
1210 1265 # now occurs at 2:00AM.
1211 1266 # ...
1212 1267 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1213 1268 # ...
1214 1269 # MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1215 1270 # Office of the Chief Information Officer
1216 1271 # Executive Council
1217 1272 # Government of Newfoundland & Labrador
1218 1273
1219 1274 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1220 1275 Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1221 1276 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1222 1277 Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1223 1278 Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1224 1279 Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1225 1280 #
1226 1281 # St John's has an apostrophe, but Posix file names can't have apostrophes.
1227 1282 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1228 1283 Zone America/St_Johns -3:30:52 - LMT 1884
1229 1284 -3:30:52 StJohns N%sT 1918
1230 1285 -3:30:52 Canada N%sT 1919
1231 1286 -3:30:52 StJohns N%sT 1935 Mar 30
1232 1287 -3:30 StJohns N%sT 1942 May 11
1233 1288 -3:30 Canada N%sT 1946
1234 1289 -3:30 StJohns N%sT 2011 Nov
1235 1290 -3:30 Canada N%sT
1236 1291
1237 1292 # most of east Labrador
1238 1293
1239 1294 # The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
1240 1295 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1241 1296 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1242 1297 -3:30:52 - NST 1918
1243 1298 -3:30:52 Canada N%sT 1919
1244 1299 -3:30:52 - NST 1935 Mar 30
1245 1300 -3:30 - NST 1936
1246 1301 -3:30 StJohns N%sT 1942 May 11
1247 1302 -3:30 Canada N%sT 1946
1248 1303 -3:30 StJohns N%sT 1966 Mar 15 2:00
1249 1304 -4:00 StJohns A%sT 2011 Nov
1250 1305 -4:00 Canada A%sT
1251 1306
1252 1307
1253 1308 # west Labrador, Nova Scotia, Prince Edward I
1254 1309
1255 1310 # From Brian Inglis (2015-07-20):
1256 1311 # From the historical weather station records available at:
1257 1312 # https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada
1258 1313 # Sydney shares the same time history as Glace Bay, so was
1259 1314 # likely to be the same across the island....
1260 1315 # Sydney, as the capital and most populous location, or Cape Breton, would
1261 1316 # have been better names for the zone had we known this in 1996.
1262 1317
1263 1318 # From Paul Eggert (2015-07-20):
1264 1319 # Shanks & Pottenger write that since 1970 most of this region has been like
1265 1320 # Halifax. Many locales did not observe peacetime DST until 1972;
1266 1321 # the Cape Breton area, represented by Glace Bay, is the largest we know of
1267 1322 # (Glace Bay was perhaps not the best name choice but no point changing now).
1268 1323 # Shanks & Pottenger also write that Liverpool, NS was the only town
1269 1324 # in Canada to observe DST in 1971 but not 1970; for now we'll assume
1270 1325 # this is a typo.
1271 1326
1272 1327 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1273 1328 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1274 1329 Rule Halifax 1916 only - Oct 1 0:00 0 S
1275 1330 Rule Halifax 1920 only - May 9 0:00 1:00 D
1276 1331 Rule Halifax 1920 only - Aug 29 0:00 0 S
1277 1332 Rule Halifax 1921 only - May 6 0:00 1:00 D
1278 1333 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1279 1334 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1280 1335 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1281 1336 Rule Halifax 1923 only - Sep 4 0:00 0 S
1282 1337 Rule Halifax 1924 only - Sep 15 0:00 0 S
1283 1338 Rule Halifax 1925 only - Sep 28 0:00 0 S
1284 1339 Rule Halifax 1926 only - May 16 0:00 1:00 D
1285 1340 Rule Halifax 1926 only - Sep 13 0:00 0 S
1286 1341 Rule Halifax 1927 only - May 1 0:00 1:00 D
1287 1342 Rule Halifax 1927 only - Sep 26 0:00 0 S
1288 1343 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1289 1344 Rule Halifax 1928 only - Sep 9 0:00 0 S
1290 1345 Rule Halifax 1929 only - Sep 3 0:00 0 S
1291 1346 Rule Halifax 1930 only - Sep 15 0:00 0 S
1292 1347 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1293 1348 Rule Halifax 1932 only - May 1 0:00 1:00 D
1294 1349 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1295 1350 Rule Halifax 1933 only - Oct 2 0:00 0 S
1296 1351 Rule Halifax 1934 only - May 20 0:00 1:00 D
1297 1352 Rule Halifax 1934 only - Sep 16 0:00 0 S
1298 1353 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1299 1354 Rule Halifax 1935 only - Sep 30 0:00 0 S
1300 1355 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1301 1356 Rule Halifax 1936 only - Sep 14 0:00 0 S
1302 1357 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1303 1358 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1304 1359 Rule Halifax 1939 only - May 28 0:00 1:00 D
1305 1360 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1306 1361 Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1307 1362 Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1308 1363 Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1309 1364 Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1310 1365 Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1311 1366 Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1312 1367 Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1313 1368 Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1314 1369 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1315 1370 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1316 1371 -4:00 Halifax A%sT 1918
1317 1372 -4:00 Canada A%sT 1919
1318 1373 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1319 1374 -4:00 Canada A%sT 1946
1320 1375 -4:00 Halifax A%sT 1974
1321 1376 -4:00 Canada A%sT
1322 1377 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1323 1378 -4:00 Canada A%sT 1953
1324 1379 -4:00 Halifax A%sT 1954
1325 1380 -4:00 - AST 1972
1326 1381 -4:00 Halifax A%sT 1974
1327 1382 -4:00 Canada A%sT
1328 1383
1329 1384 # New Brunswick
1330 1385
1331 1386 # From Paul Eggert (2007-01-31):
1332 1387 # The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1333 1388 # says they changed at 00:01 through 2006, and
1334 1389 # <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1335 1390 # clear that this was the case since at least 1993.
1336 1391 # For now, assume it started in 1993.
1337 1392
1338 1393 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1339 1394 Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1340 1395 Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1341 1396 Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1342 1397 Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1343 1398 Rule Moncton 1939 only - May 27 1:00 1:00 D
1344 1399 Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1345 1400 Rule Moncton 1940 only - May 19 1:00 1:00 D
1346 1401 Rule Moncton 1941 only - May 4 1:00 1:00 D
1347 1402 Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1348 1403 Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1349 1404 Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1350 1405 Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1351 1406 Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1352 1407 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1353 1408 Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1354 1409 -5:00 - EST 1902 Jun 15
1355 1410 -4:00 Canada A%sT 1933
1356 1411 -4:00 Moncton A%sT 1942
1357 1412 -4:00 Canada A%sT 1946
1358 1413 -4:00 Moncton A%sT 1973
1359 1414 -4:00 Canada A%sT 1993
1360 1415 -4:00 Moncton A%sT 2007
1361 1416 -4:00 Canada A%sT
1362 1417
1363 1418 # Quebec
1364 1419
1365 1420 # From Paul Eggert (2015-03-24):
1366 1421 # See America/Toronto for most of Quebec, including Montreal.
1367 1422 #
1368 1423 # Matthews and Vincent (1998) also write that Quebec east of the -63
1369 1424 # meridian is supposed to observe AST, but residents as far east as
1370 1425 # Natashquan use EST/EDT, and residents east of Natashquan use AST.
1371 1426 # The Quebec department of justice writes in
1372 1427 # "The situation in Minganie and Basse-Côte-Nord"
1373 1428 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1374 1429 # that the coastal strip from just east of Natashquan to Blanc-Sablon
1375 1430 # observes Atlantic standard time all year round.
1376 1431 # http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1377 1432 # says this common practice was codified into law as of 2007.
1378 1433 # For lack of better info, guess this practice began around 1970, contra to
1379 1434 # Shanks & Pottenger who have this region observing AST/ADT.
1380 1435
1381 1436 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1382 1437 Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1383 1438 -4:00 Canada A%sT 1970
1384 1439 -4:00 - AST
1385 1440
1386 1441 # Ontario
1387 1442
1388 1443 # From Paul Eggert (2006-07-09):
1389 1444 # Shanks & Pottenger write that since 1970 most of Ontario has been like
1390 1445 # Toronto.
1391 1446 # Thunder Bay skipped DST in 1973.
1392 1447 # Many smaller locales did not observe peacetime DST until 1974;
1393 1448 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1394 1449 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1395 1450
1396 1451 # From Mark Brader (2003-07-26):
1397 1452 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1398 1453 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1399 1454 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1400 1455 # have already done so. In Orillia DST was to run until Saturday,
1401 1456 # 1912-08-31 (no time mentioned), but it was met with considerable
1402 1457 # hostility from certain segments of the public, and was revoked after
1403 1458 # only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but
1404 1459 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1405 1460 # earlier in June).
1406 1461 #
1407 1462 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1408 1463
1409 1464 # From Paul Eggert (1997-10-17):
1410 1465 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1411 1466 # says that Atikokan, Ontario currently does not observe DST,
1412 1467 # but will vote on 11-10 whether to use EST/EDT.
1413 1468 # He also writes that the Ontario Time Act (1990, Chapter T.9)
1414 1469 # http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
1415 1470 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1416 1471 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1417 1472 # concerns a non-official time observed as a matter of local practice.
1418 1473 #
1419 1474 # From Paul Eggert (2000-10-02):
1420 1475 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1421 1476 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1422 1477 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1423 1478 # violation of the official Ontario rules.
1424 1479 #
1425 1480 # From Paul Eggert (2006-07-09):
1426 1481 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1427 1482 # 2005-07-21 Chronicle-Journal, which said:
1428 1483 #
1429 1484 # The clocks in Atikokan stay set on standard time year-round.
1430 1485 # This means they spend about half the time on central time and
1431 1486 # the other half on eastern time.
1432 1487 #
1433 1488 # For the most part, the system works, Mayor Dennis Brown said.
1434 1489 #
1435 1490 # "The majority of businesses in Atikokan deal more with Eastern
1436 1491 # Canada, but there are some that deal with Western Canada," he
1437 1492 # said. "I don't see any changes happening here."
1438 1493 #
1439 1494 # Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1440 1495 # [New Osnaburgh] follow the same practice."
1441 1496
1442 1497 # From Garry McKinnon (2006-07-14) via Chris Walton:
1443 1498 # I chatted with a member of my board who has an outstanding memory
1444 1499 # and a long history in Atikokan (and in the telecom industry) and he
1445 1500 # can say for certain that Atikokan has been practicing the current
1446 1501 # time keeping since 1952, at least.
1447 1502
1448 1503 # From Paul Eggert (2006-07-17):
1449 1504 # Shanks & Pottenger say that Atikokan has agreed with Rainy River
1450 1505 # ever since standard time was introduced, but the information from
1451 1506 # McKinnon sounds more authoritative. For now, assume that Atikokan
1452 1507 # switched to EST immediately after WWII era daylight saving time
1453 1508 # ended. This matches the old (less-populous) America/Coral_Harbour
1454 1509 # entry since our cutoff date of 1970, so we can move
1455 1510 # America/Coral_Harbour to the 'backward' file.
1456 1511
1457 1512 # From Mark Brader (2010-03-06):
1458 1513 #
1459 1514 # Currently the database has:
1460 1515 #
1461 1516 # # Ontario
1462 1517 #
1463 1518 # # From Paul Eggert (2006-07-09):
1464 1519 # # Shanks & Pottenger write that since 1970 most of Ontario has been like
1465 1520 # # Toronto.
1466 1521 # # Thunder Bay skipped DST in 1973.
1467 1522 # # Many smaller locales did not observe peacetime DST until 1974;
1468 1523 # # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1469 1524 #
1470 1525 # In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1471 1526 # right corner of page 1, it says that Toronto will return to standard
1472 1527 # time at 2 am Sunday morning (which agrees with the database), and that:
1473 1528 #
1474 1529 # The one-hour setback will go into effect throughout most of Ontario,
1475 1530 # except in areas like Windsor which remains on standard time all year.
1476 1531 #
1477 1532 # Windsor is, of course, a lot larger than Nipigon.
1478 1533 #
1479 1534 # I only came across this incidentally. I don't know if Windsor began
1480 1535 # observing DST when Detroit did, or in 1974, or on some other date.
1481 1536 #
1482 1537 # By the way, the article continues by noting that:
1483 1538 #
1484 1539 # Some cities in the United States have pushed the deadline back
1485 1540 # three weeks and will change over from daylight saving in October.
1486 1541
1487 1542 # From Arthur David Olson (2010-07-17):
1488 1543 #
1489 1544 # "Standard Time and Time Zones in Canada" appeared in
1490 1545 # The Journal of The Royal Astronomical Society of Canada,
1491 1546 # volume 26, number 2 (February 1932) and, as of 2010-07-17,
1492 1547 # was available at
1493 1548 # http://adsabs.harvard.edu/full/1932JRASC..26...49S
1494 1549 #
1495 1550 # It includes the text below (starting on page 57):
1496 1551 #
1497 1552 # A list of the places in Canada using daylight saving time would
1498 1553 # require yearly revision. From information kindly furnished by
1499 1554 # the provincial governments and by the postmasters in many cities
1500 1555 # and towns, it is found that the following places used daylight sav-
1501 1556 # ing in 1930. The information for the province of Quebec is definite,
1502 1557 # for the other provinces only approximate:
1503 1558 #
1504 1559 # Province Daylight saving time used
1505 1560 # Prince Edward Island Not used.
1506 1561 # Nova Scotia In Halifax only.
1507 1562 # New Brunswick In St. John only.
1508 1563 # Quebec In the following places:
1509 1564 # Montreal Lachine
1510 1565 # Quebec Mont-Royal
1511 1566 # Lévis Iberville
1512 1567 # St. Lambert Cap de la Madelèine
1513 1568 # Verdun Loretteville
1514 1569 # Westmount Richmond
1515 1570 # Outremont St. Jérôme
1516 1571 # Longueuil Greenfield Park
1517 1572 # Arvida Waterloo
1518 1573 # Chambly-Canton Beaulieu
1519 1574 # Melbourne La Tuque
1520 1575 # St. Théophile Buckingham
1521 1576 # Ontario Used generally in the cities and towns along
1522 1577 # the southerly part of the province. Not
1523 1578 # used in the northwesterly part.
1524 1579 # Manitoba Not used.
1525 1580 # Saskatchewan In Regina only.
1526 1581 # Alberta Not used.
1527 1582 # British Columbia Not used.
1528 1583 #
1529 1584 # With some exceptions, the use of daylight saving may be said to be limited
1530 1585 # to those cities and towns lying between Quebec city and Windsor, Ont.
1531 1586
1532 1587 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1533 1588 Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1534 1589 Rule Toronto 1919 only - Oct 26 0:00 0 S
1535 1590 Rule Toronto 1920 only - May 2 2:00 1:00 D
1536 1591 Rule Toronto 1920 only - Sep 26 0:00 0 S
1537 1592 Rule Toronto 1921 only - May 15 2:00 1:00 D
1538 1593 Rule Toronto 1921 only - Sep 15 2:00 0 S
1539 1594 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1540 1595 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1541 1596 # was meant.
1542 1597 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1543 1598 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1544 1599 # The 1927-to-1939 rules can be expressed more simply as
1545 1600 # Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1546 1601 # Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1547 1602 # Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1548 1603 # Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1549 1604 # The rules below avoid use of Sun>=25
1550 1605 # (which pre-2004 versions of zic cannot handle).
1551 1606 Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1552 1607 Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1553 1608 Rule Toronto 1932 only - May 1 2:00 1:00 D
1554 1609 Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1555 1610 Rule Toronto 1933 only - Oct 1 2:00 0 S
1556 1611 Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1557 1612 Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1558 1613 Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1559 1614 Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1560 1615 Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1561 1616 Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1562 1617 Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1563 1618 Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1564 1619 Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1565 1620 # Shanks & Pottenger say Toronto ended DST a week early in 1971,
1566 1621 # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1567 1622 # is wrong, and that he had confirmed it by checking the 1971-10-30
1568 1623 # Toronto Star, which said that DST was ending 1971-10-31 as usual.
1569 1624 Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1570 1625
1571 1626 # From Paul Eggert (2003-07-27):
1572 1627 # Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1573 1628 # Port Arthur, Ontario, the principle of the Bill has been in
1574 1629 # operation for the past three years, and in the City of Moose Jaw,
1575 1630 # Saskatchewan, for one year."
1576 1631
1577 1632 # From David Bryan via Tory Tronrud, Director/Curator,
1578 1633 # Thunder Bay Museum (2003-11-12):
1579 1634 # There is some suggestion, however, that, by-law or not, daylight
1580 1635 # savings time was being practiced in Fort William and Port Arthur
1581 1636 # before 1909.... [I]n 1910, the line between the Eastern and Central
1582 1637 # Time Zones was permanently moved about two hundred miles west to
1583 1638 # include the Thunder Bay area.... When Canada adopted daylight
1584 1639 # savings time in 1916, Fort William and Port Arthur, having done so
1585 1640 # already, did not change their clocks.... During the Second World
1586 1641 # War,... [t]he cities agreed to implement DST during the summer
1587 1642 # months for the remainder of the war years.
1588 1643
1589 1644 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1590 1645 Zone America/Toronto -5:17:32 - LMT 1895
1591 1646 -5:00 Canada E%sT 1919
1592 1647 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1593 1648 -5:00 Canada E%sT 1946
1594 1649 -5:00 Toronto E%sT 1974
1595 1650 -5:00 Canada E%sT
1596 1651 Zone America/Thunder_Bay -5:57:00 - LMT 1895
1597 1652 -6:00 - CST 1910
1598 1653 -5:00 - EST 1942
1599 1654 -5:00 Canada E%sT 1970
1600 1655 -5:00 Toronto E%sT 1973
1601 1656 -5:00 - EST 1974
1602 1657 -5:00 Canada E%sT
1603 1658 Zone America/Nipigon -5:53:04 - LMT 1895
1604 1659 -5:00 Canada E%sT 1940 Sep 29
1605 1660 -5:00 1:00 EDT 1942 Feb 9 2:00s
1606 1661 -5:00 Canada E%sT
1607 1662 Zone America/Rainy_River -6:18:16 - LMT 1895
1608 1663 -6:00 Canada C%sT 1940 Sep 29
1609 1664 -6:00 1:00 CDT 1942 Feb 9 2:00s
1610 1665 -6:00 Canada C%sT
1611 1666 Zone America/Atikokan -6:06:28 - LMT 1895
1612 1667 -6:00 Canada C%sT 1940 Sep 29
1613 1668 -6:00 1:00 CDT 1942 Feb 9 2:00s
1614 1669 -6:00 Canada C%sT 1945 Sep 30 2:00
1615 1670 -5:00 - EST
1616 1671
1617 1672
1618 1673 # Manitoba
1619 1674
1620 1675 # From Rob Douglas (2006-04-06):
1621 1676 # the old Manitoba Time Act - as amended by Bill 2, assented to
1622 1677 # March 27, 1987 ... said ...
1623 1678 # "between two o'clock Central Standard Time in the morning of
1624 1679 # the first Sunday of April of each year and two o'clock Central
1625 1680 # Standard Time in the morning of the last Sunday of October next
1626 1681 # following, one hour in advance of Central Standard Time."...
1627 1682 # I believe that the English legislation [of the old time act] had
1628 1683 # been assented to (March 22, 1967)....
1629 1684 # Also, as far as I can tell, there was no order-in-council varying
1630 1685 # the time of Daylight Saving Time for 2005 and so the provisions of
1631 1686 # the 1987 version would apply - the changeover was at 2:00 Central
1632 1687 # Standard Time (i.e. not until 3:00 Central Daylight Time).
1633 1688
1634 1689 # From Paul Eggert (2006-04-10):
1635 1690 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1636 1691 # starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1637 1692 # it was also 02:00s in 1966.
1638 1693
1639 1694 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1640 1695 Rule Winn 1916 only - Apr 23 0:00 1:00 D
1641 1696 Rule Winn 1916 only - Sep 17 0:00 0 S
1642 1697 Rule Winn 1918 only - Apr 14 2:00 1:00 D
1643 1698 Rule Winn 1918 only - Oct 27 2:00 0 S
1644 1699 Rule Winn 1937 only - May 16 2:00 1:00 D
1645 1700 Rule Winn 1937 only - Sep 26 2:00 0 S
1646 1701 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1647 1702 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1648 1703 Rule Winn 1945 only - Sep lastSun 2:00 0 S
1649 1704 Rule Winn 1946 only - May 12 2:00 1:00 D
1650 1705 Rule Winn 1946 only - Oct 13 2:00 0 S
1651 1706 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1652 1707 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1653 1708 Rule Winn 1950 only - May 1 2:00 1:00 D
1654 1709 Rule Winn 1950 only - Sep 30 2:00 0 S
1655 1710 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1656 1711 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1657 1712 Rule Winn 1959 only - Oct lastSun 2:00 0 S
1658 1713 Rule Winn 1960 only - Sep lastSun 2:00 0 S
1659 1714 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1660 1715 Rule Winn 1963 only - Sep 22 2:00 0 S
1661 1716 Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1662 1717 Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1663 1718 Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1664 1719 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1665 1720 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1666 1721 -6:00 Winn C%sT 2006
1667 1722 -6:00 Canada C%sT
1668 1723
1669 1724
1670 1725 # Saskatchewan
1671 1726
1672 1727 # From Mark Brader (2003-07-26):
1673 1728 # The first actual adoption of DST in Canada was at the municipal
1674 1729 # level. As the [Toronto] Star put it (1912-06-07), "While people
1675 1730 # elsewhere have long been talking of legislation to save daylight,
1676 1731 # the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1677 1732 # DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1678 1733 # presumably late evening, as below), and would run until "the end of
1679 1734 # the summer". The discrepancy between municipal time and railroad
1680 1735 # time was noted.
1681 1736
1682 1737 # From Paul Eggert (2003-07-27):
1683 1738 # Willett (1914-03) notes that DST "has been in operation ... in the
1684 1739 # City of Moose Jaw, Saskatchewan, for one year."
1685 1740
1686 1741 # From Paul Eggert (2006-03-22):
1687 1742 # Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1688 1743 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1689 1744 # Other western towns (e.g. Lloydminster) are like Edmonton.
1690 1745 # Matthews and Vincent (1998) write that Denare Beach and Creighton
1691 1746 # are like Winnipeg, in violation of Saskatchewan law.
1692 1747
1693 1748 # From W. Jones (1992-11-06):
1694 1749 # The. . .below is based on information I got from our law library, the
1695 1750 # provincial archives, and the provincial Community Services department.
1696 1751 # A precise history would require digging through newspaper archives, and
1697 1752 # since you didn't say what you wanted, I didn't bother.
1698 1753 #
1699 1754 # Saskatchewan is split by a time zone meridian (105W) and over the years
1700 1755 # the boundary became pretty ragged as communities near it reevaluated
1701 1756 # their affiliations in one direction or the other. In 1965 a provincial
1702 1757 # referendum favoured legislating common time practices.
1703 1758 #
1704 1759 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1705 1760 # Saskatchewan 1978) was proclaimed, and established that the eastern
1706 1761 # part of Saskatchewan would use CST year round, that districts in
1707 1762 # northwest Saskatchewan would by default follow CST but could opt to
1708 1763 # follow Mountain Time rules (thus 1 hour difference in the winter and
1709 1764 # zero in the summer), and that districts in southwest Saskatchewan would
1710 1765 # by default follow MT but could opt to follow CST.
1711 1766 #
1712 1767 # It took a few years for the dust to settle (I know one story of a town
1713 1768 # on one time zone having its school in another, such that a mom had to
1714 1769 # serve her family lunch in two shifts), but presently it seems that only
1715 1770 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1716 1771 # rules any more; all other districts appear to have used CST year round
1717 1772 # since sometime in the 1960s.
1718 1773
1719 1774 # From Chris Walton (2006-06-26):
1720 1775 # The Saskatchewan time act which was last updated in 1996 is about 30 pages
1721 1776 # long and rather painful to read.
1722 1777 # http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1723 1778
1724 1779 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1725 1780 Rule Regina 1918 only - Apr 14 2:00 1:00 D
1726 1781 Rule Regina 1918 only - Oct 27 2:00 0 S
1727 1782 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1728 1783 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1729 1784 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1730 1785 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1731 1786 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1732 1787 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1733 1788 Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1734 1789 Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1735 1790 Rule Regina 1945 only - Sep lastSun 2:00 0 S
1736 1791 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1737 1792 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1738 1793 Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1739 1794 Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1740 1795 Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1741 1796 Rule Regina 1959 only - Oct lastSun 2:00 0 S
1742 1797 #
1743 1798 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1744 1799 Rule Swift 1957 only - Oct lastSun 2:00 0 S
1745 1800 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1746 1801 Rule Swift 1959 only - Oct lastSun 2:00 0 S
1747 1802 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1748 1803 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1749 1804 Zone America/Regina -6:58:36 - LMT 1905 Sep
1750 1805 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1751 1806 -6:00 - CST
1752 1807 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1753 1808 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1754 1809 -7:00 Regina M%sT 1950
1755 1810 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1756 1811 -6:00 - CST
1757 1812
1758 1813
1759 1814 # Alberta
1760 1815
1761 1816 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1762 1817 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1763 1818 Rule Edm 1918 only - Oct 27 2:00 0 S
1764 1819 Rule Edm 1919 only - May 27 2:00 0 S
1765 1820 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1766 1821 Rule Edm 1920 only - Oct lastSun 2:00 0 S
1767 1822 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1768 1823 Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1769 1824 Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1770 1825 Rule Edm 1945 only - Sep lastSun 2:00 0 S
1771 1826 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1772 1827 Rule Edm 1947 only - Sep lastSun 2:00 0 S
1773 1828 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1774 1829 Rule Edm 1967 only - Oct lastSun 2:00 0 S
1775 1830 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1776 1831 Rule Edm 1969 only - Oct lastSun 2:00 0 S
1777 1832 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1778 1833 Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1779 1834 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1780 1835 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1781 1836 -7:00 Edm M%sT 1987
1782 1837 -7:00 Canada M%sT
1783 1838
1784 1839
1785 1840 # British Columbia
1786 1841
1787 1842 # From Paul Eggert (2006-03-22):
1788 1843 # Shanks & Pottenger write that since 1970 most of this region has
1789 1844 # been like Vancouver.
1790 1845 # Dawson Creek uses MST. Much of east BC is like Edmonton.
1791 1846 # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1792 1847
1793 1848 # It seems though that (re: Creston) is not entirely correct:
1794 1849
1795 1850 # From Chris Walton (2011-12-01):
1796 1851 # There are two areas within the Canadian province of British Columbia
1797 1852 # that do not currently observe daylight saving:
1798 1853 # a) The Creston Valley (includes the town of Creston and surrounding area)
1799 1854 # b) The eastern half of the Peace River Regional District
1800 1855 # (includes the cities of Dawson Creek and Fort St. John)
1801 1856
1802 1857 # Earlier this year I stumbled across a detailed article about the time
1803 1858 # keeping history of Creston; it was written by Tammy Hardwick who is the
1804 1859 # manager of the Creston & District Museum. The article was written in May 2009.
1805 1860 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1806 1861 # According to the article, Creston has not changed its clocks since June 1918.
1807 1862 # i.e. Creston has been stuck on UTC-7 for 93 years.
1808 1863 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1809 1864
1810 1865 # Unfortunately the exact date for the time change in June 1918 remains
1811 1866 # unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1812 1867 # ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1813 1868 # as plausible as any other date (in June). She also said that after writing
1814 1869 # the article she had discovered another time change in 1916; this is the
1815 1870 # subject of another article which she wrote in October 2010.
1816 1871 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1817 1872
1818 1873 # Here is a summary of the three clock change events in Creston's history:
1819 1874 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1820 1875 # Exact date unknown
1821 1876 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1822 1877 # Exact date in October unknown; Sunday October 1 is a reasonable guess.
1823 1878 # 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1824 1879 # Exact date in June unknown; Sunday June 2 is a reasonable guess.
1825 1880 # note 1:
1826 1881 # On Oct 27/1918 when daylight saving ended in the rest of Canada,
1827 1882 # Creston did not change its clocks.
1828 1883 # note 2:
1829 1884 # During WWII when the Federal Government legislated a mandatory clock change,
1830 1885 # Creston did not oblige.
1831 1886 # note 3:
1832 1887 # There is no guarantee that Creston will remain on Mountain Standard Time
1833 1888 # (UTC-7) forever.
1834 1889 # The subject was debated at least once this year by the town Council.
1835 1890 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1836 1891
1837 1892 # During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1838 1893 # In Creston, that was handled by shifting the area to PST (-8:00) then applying
1839 1894 # summer time to cause the offset to be -7:00, the same as it had been before
1840 1895 # the change. It can be argued that the timezone abbreviation during this
1841 1896 # period should be PDT rather than MST, but that doesn't seem important enough
1842 1897 # (to anyone) to further complicate the rules.
1843 1898
1844 1899 # The transition dates (and times) are guesses.
1845 1900
1846 1901 # From Matt Johnson (2015-09-21):
1847 1902 # Fort Nelson, BC, Canada will cancel DST this year. So while previously they
1848 1903 # were aligned with America/Vancouver, they're now aligned with
1849 1904 # America/Dawson_Creek.
1850 1905 # http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html
1851 1906 #
1852 1907 # From Tim Parenti (2015-09-23):
1853 1908 # This requires a new zone for the Northern Rockies Regional Municipality,
1854 1909 # America/Fort_Nelson. The resolution of 2014-12-08 was reached following a
1855 1910 # 2014-11-15 poll with nearly 75% support. Effectively, the municipality has
1856 1911 # been on MST (-0700) like Dawson Creek since it advanced its clocks on
1857 1912 # 2015-03-08.
1858 1913 #
1859 1914 # From Paul Eggert (2015-09-23):
1860 1915 # Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver.
1861 1916
1862 1917 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1863 1918 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1864 1919 Rule Vanc 1918 only - Oct 27 2:00 0 S
1865 1920 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1866 1921 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1867 1922 Rule Vanc 1945 only - Sep 30 2:00 0 S
1868 1923 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1869 1924 Rule Vanc 1946 only - Oct 13 2:00 0 S
1870 1925 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1871 1926 Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1872 1927 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1873 1928 Zone America/Vancouver -8:12:28 - LMT 1884
1874 1929 -8:00 Vanc P%sT 1987
1875 1930 -8:00 Canada P%sT
1876 1931 Zone America/Dawson_Creek -8:00:56 - LMT 1884
1877 1932 -8:00 Canada P%sT 1947
1878 1933 -8:00 Vanc P%sT 1972 Aug 30 2:00
1879 1934 -7:00 - MST
1880 1935 Zone America/Fort_Nelson -8:10:47 - LMT 1884
1881 1936 -8:00 Vanc P%sT 1946
1882 1937 -8:00 - PST 1947
1883 1938 -8:00 Vanc P%sT 1987
1884 1939 -8:00 Canada P%sT 2015 Mar 8 2:00
1885 1940 -7:00 - MST
1886 1941 Zone America/Creston -7:46:04 - LMT 1884
1887 1942 -7:00 - MST 1916 Oct 1
1888 1943 -8:00 - PST 1918 Jun 2
1889 1944 -7:00 - MST
1890 1945
1891 1946 # Northwest Territories, Nunavut, Yukon
1892 1947
1893 1948 # From Paul Eggert (2006-03-22):
1894 1949 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1895 1950 # Mathew Englander (1996-10-07) gives the following refs:
1896 1951 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1897 1952 # c. 7 defines Yukon standard time as UTC-9....
1898 1953 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1899 1954 # [http://canlii.ca/t/7vhg]
1900 1955 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1901 1956 # * O.I.C. 1980/02 established DST.
1902 1957 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1903 1958
1904 1959 # From Brian Inglis (2015-04-14):
1905 1960 #
1906 1961 # I tried to trace the history of Yukon time and found the following
1907 1962 # regulations, giving the reference title and URL if found, regulation name,
1908 1963 # and relevant quote if available. Each regulation specifically revokes its
1909 1964 # predecessor. The final reference is to the current Interpretation Act
1910 1965 # authorizing and resulting from these regulatory changes.
1911 1966 #
1912 1967 # Only recent regulations were retrievable via Yukon government site search or
1913 1968 # index, and only some via Canadian legal sources. Other sources used include
1914 1969 # articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS
1915 1970 # Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and
1916 1971 # 1970 quoted below; each article includes current extracts from provincial
1917 1972 # and territorial ST and DST regulations at the end, summaries and details of
1918 1973 # standard times and daylight saving time at many locations across Canada,
1919 1974 # with time zone maps, tables and calculations for Canadian Sunrise, Sunset,
1920 1975 # and LMST; they also cover many countries and global locations, with a chart
1921 1976 # and table showing current Universal Time offsets, and may be useful as
1922 1977 # another source of information for 1970 and earlier.
1923 1978 #
1924 1979 # * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26,
1925 1980 # pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS)
1926 1981 # http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75:
1927 1982 # Yukon Interpretation Ordinance
1928 1983 # Yukon standard time is the local mean time at the one hundred and
1929 1984 # thirty-fifth meridian.
1930 1985 #
1931 1986 # * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.;
1932 1987 # JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System
1933 1988 # (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1:
1934 1989 # Yukon Interpretation Ordinance, 1955, Chap. 16.
1935 1990 #
1936 1991 # (1) Subject to this section, standard time shall be reckoned as nine
1937 1992 # hours behind Greenwich Time and called Yukon Standard Time.
1938 1993 #
1939 1994 # (2) Notwithstanding subsection (1), the Commissioner may make regulations
1940 1995 # varying the manner of reckoning standard time.
1941 1996 #
1942 1997 # * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance
1943 1998 # http://? - no online source found
1944 1999 #
1945 2000 # * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
1946 2001 # Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
1947 2002 # http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
1948 2003 # Territory Commissioner's Order 1967-59 Interpretation Ordinance ...
1949 2004 #
1950 2005 # 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon
1951 2006 # Territory on 27th January, 1966, is hereby revoked.
1952 2007 #
1953 2008 # 2. Yukon (East) Standard Time as defined by section 36 of the
1954 2009 # Interpretation Ordinance from and after mid-night on the 28th day of May,
1955 2010 # 1967 shall be reckoned in the same manner as Pacific Standard Time, that
1956 2011 # is to say, eight hours behind Greenwich Time in the area of the Yukon
1957 2012 # Territory lying east of the 138th degree longitude west.
1958 2013 #
1959 2014 # 3. In the remainder of the Territory, lying west of the 138th degree
1960 2015 # longitude west, Yukon (West) Standard Time shall be reckoned as nine
1961 2016 # hours behind Greenwich Time.
1962 2017 #
1963 2018 # * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214
1964 2019 # http://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html
1965 2020 # C.O. 1973/214 INTERPRETATION ACT ...
1966 2021 #
1967 2022 # 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby
1968 2023 # revoked.
1969 2024 #
1970 2025 # 2. Yukon Standard Time as defined by section 36 of the Interpretation
1971 2026 # Act from and after midnight on the twenty-eighth day of October, 1973
1972 2027 # shall be reckoned in the same manner as Pacific Standard Time, that is
1973 2028 # to say eight hours behind Greenwich Time.
1974 2029 #
1975 2030 # * O.I.C. 1980/02 INTERPRETATION ACT
1976 2031 # http://? - no online source found
1977 2032 #
1978 2033 # * Yukon Daylight Saving Time, YOIC 1987/56
1979 2034 # http://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
1980 2035 # O.I.C. 1987/056 INTERPRETATION ACT ...
1981 2036 #
1982 2037 # In every year between
1983 2038 # (a) two o'clock in the morning in the first Sunday in April, and
1984 2039 # (b) two o'clock in the morning in the last Sunday in October,
1985 2040 # Standard Time shall be reckoned as seven hours behind Greenwich Time and
1986 2041 # called Yukon Daylight Saving Time.
1987 2042 # ...
1988 2043 # Dated ... 9th day of March, A.D., 1987.
1989 2044 #
1990 2045 # * Yukon Daylight Saving Time 2006, YOIC 2006/127
1991 2046 # http://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html
1992 2047 # O.I.C. 2006/127 INTERPRETATION ACT ...
1993 2048 #
1994 2049 # 1. In Yukon each year the time for general purposes shall be 7 hours
1995 2050 # behind Greenwich mean time during the period commencing at two o'clock
1996 2051 # in the forenoon on the second Sunday of March and ending at two o'clock
1997 2052 # in the forenoon on the first Sunday of November and shall be called
1998 2053 # Yukon Daylight Saving Time.
1999 2054 #
2000 2055 # 2. Order-in-Council 1987/56 is revoked.
2001 2056 #
2002 2057 # 3. This order comes into force January 1, 2007.
2003 2058 #
2004 2059 # * Interpretation Act, RSY 2002, c 125
2005 2060 # http://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html
2006 2061
2007 2062 # From Rives McDow (1999-09-04):
2008 2063 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
2009 2064 # Nunavut moves to single time zone Oct. 31
2010 2065 # http://www.nunatsiaq.com/nunavut/nvt90903_13.html
2011 2066 #
2012 2067 # From Antoine Leca (1999-09-06):
2013 2068 # We then need to create a new timezone for the Kitikmeot region of Nunavut
2014 2069 # to differentiate it from the Yellowknife region.
2015 2070
2016 2071 # From Paul Eggert (1999-09-20):
2017 2072 # Basic Facts: The New Territory
2018 2073 # http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html
2019 2074 # (1999) reports that Pangnirtung operates on eastern time,
2020 2075 # and that Coral Harbour does not observe DST. We don't know when
2021 2076 # Pangnirtung switched to eastern time; we'll guess 1995.
2022 2077
2023 2078 # From Rives McDow (1999-11-08):
2024 2079 # On October 31, when the rest of Nunavut went to Central time,
2025 2080 # Pangnirtung wobbled. Here is the result of their wobble:
2026 2081 #
2027 2082 # The following businesses and organizations in Pangnirtung use Central Time:
2028 2083 #
2029 2084 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
2030 2085 # Eastern Arctic National Parks, A & D Specialist
2031 2086 #
2032 2087 # The following businesses and organizations in Pangnirtung use Eastern Time:
2033 2088 #
2034 2089 # Hamlet office, All other businesses, Both schools, Airport operator
2035 2090 #
2036 2091 # This has made for an interesting situation there, which warranted the news.
2037 2092 # No one there that I spoke with seems concerned, or has plans to
2038 2093 # change the local methods of keeping time, as it evidently does not
2039 2094 # really interfere with any activities or make things difficult locally.
2040 2095 # They plan to celebrate New Year's turn-over twice, one hour apart,
2041 2096 # so it appears that the situation will last at least that long.
2042 2097 # The Nunavut Intergovernmental Affairs hopes that they will "come to
2043 2098 # their senses", but the locals evidently don't see any problem with
2044 2099 # the current state of affairs.
2045 2100
2046 2101 # From Michaela Rodrigue, writing in the
2047 2102 # Nunatsiaq News (1999-11-19):
2048 2103 # http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html
2049 2104 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
2050 2105 # central - or Nunavut time - for government offices, and eastern time
2051 2106 # for municipal offices and schools.... Igloolik [was similar but then]
2052 2107 # made the switch to central time on Saturday, Nov. 6.
2053 2108
2054 2109 # From Paul Eggert (2000-10-02):
2055 2110 # Matthews and Vincent (1998) say the following, but we lack histories
2056 2111 # for these potential new Zones.
2057 2112 #
2058 2113 # The Canadian Forces station at Alert uses Eastern Time while the
2059 2114 # handful of residents at the Eureka weather station [in the Central
2060 2115 # zone] skip daylight savings. Baffin Island, which is crossed by the
2061 2116 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
2062 2117 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
2063 2118 # Central Time and Southampton Island [in the Central zone] is not
2064 2119 # required to use daylight savings.
2065 2120
2066 2121 # From <http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html>
2067 2122 # Nunavut now has two time zones (2000-11-10):
2068 2123 # The Nunavut government would allow its employees in Kugluktuk and
2069 2124 # Cambridge Bay to operate on central time year-round, putting them
2070 2125 # one hour behind the rest of Nunavut for six months during the winter.
2071 2126 # At the end of October the two communities had rebelled against
2072 2127 # Nunavut's unified time zone, refusing to shift to eastern time with
2073 2128 # the rest of the territory for the winter. Cambridge Bay remained on
2074 2129 # central time, while Kugluktuk, even farther west, reverted to
2075 2130 # mountain time, which they had used before the advent of Nunavut's
2076 2131 # unified time zone in 1999.
2077 2132 #
2078 2133 # From Rives McDow (2001-01-20), quoting the Nunavut government:
2079 2134 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
2080 2135
2081 2136 # From Paul Eggert (2000-12-04):
2082 2137 # Let's just keep track of the official times for now.
2083 2138
2084 2139 # From Rives McDow (2001-03-07):
2085 2140 # The premier of Nunavut has issued a ministerial statement advising
2086 2141 # that effective 2001-04-01, the territory of Nunavut will revert
2087 2142 # back to three time zones (mountain, central, and eastern). Of the
2088 2143 # cities in Nunavut, Coral Harbor is the only one that I know of that
2089 2144 # has said it will not observe dst, staying on EST year round. I'm
2090 2145 # checking for more info, and will get back to you if I come up with
2091 2146 # more.
2092 2147 # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
2093 2148
2094 2149 # From Gwillim Law (2005-05-21):
2095 2150 # According to ...
2096 2151 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
2097 2152 # (from a 1998 Canadian Geographic article), the de facto and de jure time
2098 2153 # for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
2099 2154 # round. Using Google, it's easy to find other websites that confirm this.
2100 2155 # I wasn't able to find how far back this time regimen goes, but since it
2101 2156 # predates the creation of Nunavut, it probably goes back many years....
2102 2157 # The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
2103 2158 #
2104 2159 # From Paul Eggert (2014-10-17):
2105 2160 # For lack of better information, assume that Southampton Island observed
2106 2161 # daylight saving only during wartime. Gwillim Law's email also
2107 2162 # mentioned maps now maintained by National Research Council Canada;
2108 2163 # see above for an up-to-date link.
2109 2164
2110 2165 # From Chris Walton (2007-03-01):
2111 2166 # ... the community of Resolute (located on Cornwallis Island in
2112 2167 # Nunavut) moved from Central Time to Eastern Time last November.
2113 2168 # Basically the community did not change its clocks at the end of
2114 2169 # daylight saving....
2115 2170 # http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
2116 2171
2117 2172 # From Chris Walton (2011-03-21):
2118 2173 # Back in 2007 I initiated the creation of a new "zone file" for Resolute
2119 2174 # Bay. Resolute Bay is a small community located about 900km north of
2120 2175 # the Arctic Circle. The zone file was required because Resolute Bay had
2121 2176 # decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
2122 2177 #
2123 2178 # According to new information which I received last week, Resolute Bay
2124 2179 # went back to using UTC-6 in the winter of 2007-2008...
2125 2180 #
2126 2181 # On March 11/2007 most of Canada went onto daylight saving. On March
2127 2182 # 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
2128 2183 # talked to somebody that was both knowledgeable and helpful. I was able
2129 2184 # to confirm that Resolute Bay was still operating on UTC-5. It was
2130 2185 # explained to me that Resolute Bay had been on the Eastern Time zone
2131 2186 # (EST) in the winter, and was now back on the Central Time zone (CDT).
2132 2187 # i.e. the time zone had changed twice in the last year but the clocks
2133 2188 # had not moved. The residents had to know which time zone they were in
2134 2189 # so they could follow the correct TV schedule...
2135 2190 #
2136 2191 # On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
2137 2192 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2138 2193 # of the phone call, I decided to seek out an alternate source of
2139 2194 # information. I found an e-mail address for somebody by the name of
2140 2195 # Stephanie Adams whose job was listed as "Inns North Support Officer for
2141 2196 # Arctic Co-operatives." I was under the impression that Stephanie lived
2142 2197 # and worked in Resolute Bay...
2143 2198 #
2144 2199 # On March 14/2011 I phoned the hamlet office again. I was told that
2145 2200 # Resolute Bay had been using Central Standard Time over the winter of
2146 2201 # 2010-2011 and that the clocks had therefore been moved one hour ahead
2147 2202 # on March 13/2011. The person I talked to was aware that Resolute Bay
2148 2203 # had previously experimented with Eastern Standard Time but he could not
2149 2204 # tell me when the practice had stopped.
2150 2205 #
2151 2206 # On March 17/2011 I searched the Web to find an e-mail address of
2152 2207 # somebody that might be able to tell me exactly when Resolute Bay went
2153 2208 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2154 2209 # used to be the mayor of Resolute Bay and he apparently owns half the
2155 2210 # businesses including "South Camp Inn." This website has some info on
2156 2211 # Aziz:
2157 2212 # http://www.uphere.ca/node/493
2158 2213 #
2159 2214 # I sent Aziz an e-mail asking when Resolute Bay had stopped using
2160 2215 # Eastern Standard Time.
2161 2216 #
2162 2217 # Aziz responded quickly with this: "hi, The time was not changed for the
2163 2218 # 1 year only, the following year, the community went back to the old way
2164 2219 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2165 2220 # the winter Zulu plus 6 hrs"
2166 2221 #
2167 2222 # This of course conflicted with everything I had ascertained in November 2008.
2168 2223 #
2169 2224 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2170 2225 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2171 2226 # may want to check with the weather office in Resolute Bay or do a
2172 2227 # search on the weather through Env. Canada. web site"
2173 2228 #
2174 2229 # If I had realized the Stephanie did not live in Resolute Bay I would
2175 2230 # never have contacted her. I now believe that all the information I
2176 2231 # obtained in November 2008 should be ignored...
2177 2232 # I apologize for reporting incorrect information in 2008.
2178 2233
2179 2234 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2180 2235 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
2181 2236 Rule NT_YK 1918 only - Oct 27 2:00 0 S
2182 2237 Rule NT_YK 1919 only - May 25 2:00 1:00 D
2183 2238 Rule NT_YK 1919 only - Nov 1 0:00 0 S
|
↓ open down ↓ |
1753 lines elided |
↑ open up ↑ |
2184 2239 Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
2185 2240 Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
2186 2241 Rule NT_YK 1945 only - Sep 30 2:00 0 S
2187 2242 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
2188 2243 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
2189 2244 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
2190 2245 Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
2191 2246 Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
2192 2247 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2193 2248 # aka Panniqtuuq
2194 -Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
2249 +Zone America/Pangnirtung 0 - -00 1921 # trading post est.
2195 2250 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
2196 2251 -5:00 Canada E%sT 1999 Oct 31 2:00
2197 2252 -6:00 Canada C%sT 2000 Oct 29 2:00
2198 2253 -5:00 Canada E%sT
2199 2254 # formerly Frobisher Bay
2200 -Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
2255 +Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est.
2201 2256 -5:00 NT_YK E%sT 1999 Oct 31 2:00
2202 2257 -6:00 Canada C%sT 2000 Oct 29 2:00
2203 2258 -5:00 Canada E%sT
2204 2259 # aka Qausuittuq
2205 -Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
2260 +Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded
2206 2261 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2207 2262 -5:00 - EST 2001 Apr 1 3:00
2208 2263 -6:00 Canada C%sT 2006 Oct 29 2:00
2209 2264 -5:00 - EST 2007 Mar 11 3:00
2210 2265 -6:00 Canada C%sT
2211 2266 # aka Kangiqiniq
2212 -Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
2267 +Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded
2213 2268 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2214 2269 -5:00 - EST 2001 Apr 1 3:00
2215 2270 -6:00 Canada C%sT
2216 2271 # aka Iqaluktuuttiaq
2217 -Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
2272 +Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.?
2218 2273 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2219 2274 -6:00 Canada C%sT 2000 Oct 29 2:00
2220 2275 -5:00 - EST 2000 Nov 5 0:00
2221 2276 -6:00 - CST 2001 Apr 1 3:00
2222 2277 -7:00 Canada M%sT
2223 -Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
2278 +Zone America/Yellowknife 0 - -00 1935 # Yellowknife founded?
2224 2279 -7:00 NT_YK M%sT 1980
2225 2280 -7:00 Canada M%sT
2226 -Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
2281 +Zone America/Inuvik 0 - -00 1953 # Inuvik founded
2227 2282 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2228 2283 -7:00 NT_YK M%sT 1980
2229 2284 -7:00 Canada M%sT
2230 2285 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2231 2286 -9:00 NT_YK Y%sT 1967 May 28 0:00
2232 2287 -8:00 NT_YK P%sT 1980
2233 2288 -8:00 Canada P%sT
2234 2289 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2235 2290 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2236 2291 -8:00 NT_YK P%sT 1980
2237 2292 -8:00 Canada P%sT
2238 2293
2239 2294
2240 2295 ###############################################################################
2241 2296
2242 2297 # Mexico
2243 2298
2244 2299 # From Paul Eggert (2014-12-07):
2245 2300 # The Investigation and Analysis Service of the
2246 2301 # Mexican Library of Congress (MLoC) has published a
2247 2302 # history of Mexican local time (in Spanish)
2248 2303 # http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm
2249 2304 #
2250 2305 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2251 2306 # (In all cases we go with the MLoC.)
2252 2307 # S&P report that Baja was at -8:00 in 1922/1923.
2253 2308 # S&P say the 1930 transition in Baja was 1930-11-16.
2254 2309 # S&P report no DST during summer 1931.
2255 2310 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2256 2311
2257 2312 # From Gwillim Law (2001-02-20):
2258 2313 # There are some other discrepancies between the Decrees page and the
2259 2314 # tz database. I think they can best be explained by supposing that
2260 2315 # the researchers who prepared the Decrees page failed to find some of
2261 2316 # the relevant documents.
2262 2317
2263 2318 # From Alan Perry (1996-02-15):
2264 2319 # A guy from our Mexico subsidiary finally found the Presidential Decree
2265 2320 # outlining the timezone changes in Mexico.
2266 2321 #
2267 2322 # ------------- Begin Forwarded Message -------------
2268 2323 #
2269 2324 # I finally got my hands on the Official Presidential Decree that sets up the
2270 2325 # rules for the DST changes. The rules are:
2271 2326 #
2272 2327 # 1. The country is divided in 3 timezones:
2273 2328 # - Baja California Norte (the Mexico/BajaNorte TZ)
2274 2329 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2275 2330 # - The rest of the country (the Mexico/General TZ)
2276 2331 #
2277 2332 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2278 2333 # at 2:00 AM, the times in each zone are as follows:
2279 2334 # BajaNorte: GMT+7
2280 2335 # BajaSur: GMT+6
2281 2336 # General: GMT+5
2282 2337 #
2283 2338 # 3. The rest of the year, the times are as follows:
2284 2339 # BajaNorte: GMT+8
2285 2340 # BajaSur: GMT+7
2286 2341 # General: GMT+6
2287 2342 #
2288 2343 # The Decree was published in Mexico's Official Newspaper on January 4th.
2289 2344 #
2290 2345 # -------------- End Forwarded Message --------------
2291 2346 # From Paul Eggert (1996-06-12):
2292 2347 # For an English translation of the decree, see
2293 2348 # "Diario Oficial: Time Zone Changeover" (1996-01-04).
2294 2349 # http://mexico-travel.com/extra/timezone_eng.html
2295 2350
2296 2351 # From Rives McDow (1998-10-08):
2297 2352 # The State of Quintana Roo has reverted back to central STD and DST times
2298 2353 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
2299 2354
2300 2355 # From Rives McDow (2000-01-10):
2301 2356 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2302 2357 # zone 5 hours from the International Date Line, and will not observe daylight
2303 2358 # savings time so as to stay on the same time zone as the southern part of
2304 2359 # Arizona year round.
2305 2360
2306 2361 # From Jesper Nørgaard, translating
2307 2362 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2308 2363 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
2309 2364 # Syndicate of Education Workers, refuse to apply daylight saving each
2310 2365 # year, so that the more than 10,000 schools work at normal hour the
2311 2366 # whole year.
2312 2367
2313 2368 # From Gwillim Law (2001-01-19):
2314 2369 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2315 2370 # (translated):...
2316 2371 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2317 2372 # that Summer Time will be reduced from seven to five months, starting
2318 2373 # this year....
2319 2374 # http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001
2320 2375 # [translated], says "summer time will ... take effect on the first Sunday
2321 2376 # in May, and end on the last Sunday of September.
2322 2377
2323 2378 # From Arthur David Olson (2001-01-25):
2324 2379 # The 2001-01-24 traditional Washington Post contained the page one
2325 2380 # story "Timely Issue Divides Mexicans."...
2326 2381 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2327 2382 # ... Mexico City Mayor López Obrador "...is threatening to keep
2328 2383 # Mexico City and its 20 million residents on a different time than
2329 2384 # the rest of the country..." In particular, López Obrador would abolish
2330 2385 # observation of Daylight Saving Time.
2331 2386
2332 2387 # Official statute published by the Energy Department
2333 2388 # http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre
2334 2389 # (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2335 2390 # and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03).
2336 2391
2337 2392 # From Paul Eggert (2001-03-03):
2338 2393 #
2339 2394 # http://www.latimes.com/news/nation/20010303/t000018766.html
2340 2395 # James F. Smith writes in today's LA Times
2341 2396 # * Sonora will continue to observe standard time.
2342 2397 # * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that
2343 2398 # the Federal District will not adopt DST.
2344 2399 # * 4 of 16 district leaders announced they'll ignore the decree.
2345 2400 # * The decree does not affect federal-controlled facilities including
2346 2401 # the airport, banks, hospitals, and schools.
2347 2402 #
2348 2403 # For now we'll assume that the Federal District will bow to federal rules.
2349 2404
2350 2405 # From Jesper Nørgaard (2001-04-01):
2351 2406 # I found some references to the Mexican application of daylight
2352 2407 # saving, which modifies what I had already sent you, stating earlier
2353 2408 # that a number of northern Mexican states would go on daylight
2354 2409 # saving. The modification reverts this to only cover Baja California
2355 2410 # (Norte), while all other states (except Sonora, who has no daylight
2356 2411 # saving all year) will follow the original decree of president
2357 2412 # Vicente Fox, starting daylight saving May 6, 2001 and ending
2358 2413 # September 30, 2001.
2359 2414 # References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp>
2360 2415 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2361 2416
2362 2417 # From Reuters (2001-09-04):
2363 2418 # Mexico's Supreme Court on Tuesday declared that daylight savings was
2364 2419 # unconstitutional in Mexico City, creating the possibility the
2365 2420 # capital will be in a different time zone from the rest of the nation
2366 2421 # next year.... The Supreme Court's ruling takes effect at 2:00
2367 2422 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2368 2423 # standard time. "This is so residents of the Federal District are not
2369 2424 # subject to unexpected time changes," a statement from the court said.
2370 2425
2371 2426 # From Jesper Nørgaard Welen (2002-03-12):
2372 2427 # ... consulting my local grocery store(!) and my coworkers, they all insisted
2373 2428 # that a new decision had been made to reinstate US style DST in Mexico....
2374 2429 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2375 2430 # confirms this. Sonora as usual is the only state where DST is not applied.
2376 2431
2377 2432 # From Steffen Thorsen (2009-12-28):
2378 2433 #
2379 2434 # Steffen Thorsen wrote:
2380 2435 # > Mexico's House of Representatives has approved a proposal for northern
2381 2436 # > Mexico's border cities to share the same daylight saving schedule as
2382 2437 # > the United States.
2383 2438 # Now this has passed both the Congress and the Senate, so starting from
2384 2439 # 2010, some border regions will be the same:
2385 2440 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2386 2441 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2387 2442 # (Spanish)
2388 2443 #
2389 2444 # Could not find the new law text, but the proposed law text changes are here:
2390 2445 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2391 2446 # (Gaceta Parlamentaria)
2392 2447 #
2393 2448 # There is also a list of the votes here:
2394 2449 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2395 2450 #
2396 2451 # Our page:
2397 2452 # http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2398 2453
2399 2454 # From Arthur David Olson (2010-01-20):
2400 2455 # The page
2401 2456 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2402 2457 # includes this text:
2403 2458 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2404 2459 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2405 2460 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2406 2461 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
2407 2462 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
2408 2463 # horas del primer domingo de noviembre.
2409 2464 # En los municipios fronterizos que se encuentren ubicados en la franja
2410 2465 # fronteriza norte en el territorio comprendido entre la línea
2411 2466 # internacional y la línea paralela ubicada a una distancia de veinte
2412 2467 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2413 2468 # interior del país, la aplicación de este horario estacional surtirá
2414 2469 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
2415 2470 # las dos horas del primer domingo de noviembre.
2416 2471
2417 2472 # From Steffen Thorsen (2014-12-08), translated by Gwillim Law:
2418 2473 # The Mexican state of Quintana Roo will likely change to EST in 2015.
2419 2474 #
2420 2475 # http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo
2421 2476 # "With this change, the time conflict that has existed between the municipios
2422 2477 # of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an
2423 2478 # end. The latter declared itself in rebellion 15 years ago when a time change
2424 2479 # was initiated in Mexico, and since then it has refused to change its time
2425 2480 # zone along with the rest of the country."
2426 2481 #
2427 2482 # From Steffen Thorsen (2015-01-14), translated by Gwillim Law:
2428 2483 # http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html
2429 2484 # "...the new time zone will come into effect at two o'clock on the first Sunday
2430 2485 # of February, when we will have to advance the clock one hour from its current
2431 2486 # time..."
2432 2487 # Also, the new zone will not use DST.
2433 2488 #
2434 2489 # From Carlos Raúl Perasso (2015-02-02):
2435 2490 # The decree that modifies the Mexican Hour System Law has finally
2436 2491 # been published at the Diario Oficial de la Federación
2437 2492 # http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015
2438 2493 # It establishes 5 zones for Mexico:
2439 2494 # 1- Zona Centro (Central Zone): Corresponds to longitude 90 W,
2440 2495 # includes most of Mexico, excluding what's mentioned below.
2441 2496 # 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the
2442 2497 # states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía
2443 2498 # de Banderas which lies in Central Zone); Sinaloa and Sonora.
2444 2499 # 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the
2445 2500 # state of Baja California.
2446 2501 # 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state
2447 2502 # of Quintana Roo.
2448 2503 # 5- The islands, reefs and keys shall take their timezone from the
2449 2504 # longitude they are located at.
2450 2505
2451 2506 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2452 2507 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2453 2508 Rule Mexico 1939 only - Jun 25 0:00 0 S
2454 2509 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2455 2510 Rule Mexico 1941 only - Apr 1 0:00 0 S
2456 2511 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2457 2512 Rule Mexico 1944 only - May 1 0:00 0 S
2458 2513 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2459 2514 Rule Mexico 1950 only - Jul 30 0:00 0 S
2460 2515 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2461 2516 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2462 2517 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2463 2518 Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2464 2519 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2465 2520 Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2466 2521 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2467 2522 # Quintana Roo; represented by Cancún
2468 2523 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
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2469 2524 -6:00 - CST 1981 Dec 23
2470 2525 -5:00 Mexico E%sT 1998 Aug 2 2:00
2471 2526 -6:00 Mexico C%sT 2015 Feb 1 2:00
2472 2527 -5:00 - EST
2473 2528 # Campeche, Yucatán; represented by Mérida
2474 2529 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2475 2530 -6:00 - CST 1981 Dec 23
2476 2531 -5:00 - EST 1982 Dec 2
2477 2532 -6:00 Mexico C%sT
2478 2533 # Coahuila, Nuevo León, Tamaulipas (near US border)
2534 +# This includes the following municipalities:
2535 +# in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava,
2536 +# Guerrero, Hidalgo.
2537 +# in Nuevo León: Anáhuac, Los Aldama.
2538 +# in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo,
2539 +# Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros.
2540 +# See: Inicia mañana Horario de Verano en zona fronteriza, El Universal,
2541 +# 2016-03-12
2542 +# http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza
2479 2543 Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2480 2544 -6:00 - CST 1988
2481 2545 -6:00 US C%sT 1989
2482 2546 -6:00 Mexico C%sT 2010
2483 2547 -6:00 US C%sT
2484 2548 # Durango; Coahuila, Nuevo León, Tamaulipas (away from US border)
2485 2549 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2486 2550 -6:00 - CST 1988
2487 2551 -6:00 US C%sT 1989
2488 2552 -6:00 Mexico C%sT
2489 2553 # Central Mexico
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2490 2554 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2491 2555 -7:00 - MST 1927 Jun 10 23:00
2492 2556 -6:00 - CST 1930 Nov 15
2493 2557 -7:00 - MST 1931 May 1 23:00
2494 2558 -6:00 - CST 1931 Oct
2495 2559 -7:00 - MST 1932 Apr 1
2496 2560 -6:00 Mexico C%sT 2001 Sep 30 2:00
2497 2561 -6:00 - CST 2002 Feb 20
2498 2562 -6:00 Mexico C%sT
2499 2563 # Chihuahua (near US border)
2564 +# This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe,
2565 +# Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides.
2566 +# (See the 2016-03-12 El Universal source mentioned above.)
2500 2567 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2501 2568 -7:00 - MST 1927 Jun 10 23:00
2502 2569 -6:00 - CST 1930 Nov 15
2503 2570 -7:00 - MST 1931 May 1 23:00
2504 2571 -6:00 - CST 1931 Oct
2505 2572 -7:00 - MST 1932 Apr 1
2506 2573 -6:00 - CST 1996
2507 2574 -6:00 Mexico C%sT 1998
2508 2575 -6:00 - CST 1998 Apr Sun>=1 3:00
2509 2576 -7:00 Mexico M%sT 2010
2510 2577 -7:00 US M%sT
2511 2578 # Chihuahua (away from US border)
2512 2579 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2513 2580 -7:00 - MST 1927 Jun 10 23:00
2514 2581 -6:00 - CST 1930 Nov 15
2515 2582 -7:00 - MST 1931 May 1 23:00
2516 2583 -6:00 - CST 1931 Oct
2517 2584 -7:00 - MST 1932 Apr 1
2518 2585 -6:00 - CST 1996
2519 2586 -6:00 Mexico C%sT 1998
2520 2587 -6:00 - CST 1998 Apr Sun>=1 3:00
2521 2588 -7:00 Mexico M%sT
2522 2589 # Sonora
2523 2590 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2524 2591 -7:00 - MST 1927 Jun 10 23:00
2525 2592 -6:00 - CST 1930 Nov 15
2526 2593 -7:00 - MST 1931 May 1 23:00
2527 2594 -6:00 - CST 1931 Oct
2528 2595 -7:00 - MST 1932 Apr 1
2529 2596 -6:00 - CST 1942 Apr 24
2530 2597 -7:00 - MST 1949 Jan 14
2531 2598 -8:00 - PST 1970
2532 2599 -7:00 Mexico M%sT 1999
2533 2600 -7:00 - MST
2534 2601
2535 2602 # From Alexander Krivenyshev (2010-04-21):
2536 2603 # According to news, Bahía de Banderas (Mexican state of Nayarit)
2537 2604 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2538 2605 # share the same time zone as nearby city Puerto Vallarta, Jalisco).
2539 2606 #
2540 2607 # (Spanish)
2541 2608 # Bahía de Banderas homologa su horario al del centro del
2542 2609 # país, a partir de este domingo
2543 2610 # http://www.nayarit.gob.mx/notes.asp?id=20748
2544 2611 #
2545 2612 # Bahía de Banderas homologa su horario con el del Centro del
2546 2613 # País
2547 2614 # http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50
2548 2615 #
2549 2616 # (English)
2550 2617 # Puerto Vallarta and Bahía de Banderas: One Time Zone
2551 2618 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2552 2619 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2553 2620 #
2554 2621 # "Mexico's Senate approved the amendments to the Mexican Schedule System that
2555 2622 # will allow Bahía de Banderas and Puerto Vallarta to share the same time
2556 2623 # zone ..."
2557 2624 # Baja California Sur, Nayarit, Sinaloa
2558 2625
2559 2626 # From Arthur David Olson (2010-05-01):
2560 2627 # Use "Bahia_Banderas" to keep the name to fourteen characters.
2561 2628
2562 2629 # Mazatlán
2563 2630 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2564 2631 -7:00 - MST 1927 Jun 10 23:00
2565 2632 -6:00 - CST 1930 Nov 15
2566 2633 -7:00 - MST 1931 May 1 23:00
2567 2634 -6:00 - CST 1931 Oct
2568 2635 -7:00 - MST 1932 Apr 1
2569 2636 -6:00 - CST 1942 Apr 24
2570 2637 -7:00 - MST 1949 Jan 14
2571 2638 -8:00 - PST 1970
2572 2639 -7:00 Mexico M%sT
2573 2640
2574 2641 # Bahía de Banderas
2575 2642 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2576 2643 -7:00 - MST 1927 Jun 10 23:00
2577 2644 -6:00 - CST 1930 Nov 15
2578 2645 -7:00 - MST 1931 May 1 23:00
2579 2646 -6:00 - CST 1931 Oct
2580 2647 -7:00 - MST 1932 Apr 1
2581 2648 -6:00 - CST 1942 Apr 24
2582 2649 -7:00 - MST 1949 Jan 14
2583 2650 -8:00 - PST 1970
2584 2651 -7:00 Mexico M%sT 2010 Apr 4 2:00
2585 2652 -6:00 Mexico C%sT
2586 2653
2587 2654 # Baja California
2588 2655 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2589 2656 -7:00 - MST 1924
2590 2657 -8:00 - PST 1927 Jun 10 23:00
2591 2658 -7:00 - MST 1930 Nov 15
2592 2659 -8:00 - PST 1931 Apr 1
2593 2660 -8:00 1:00 PDT 1931 Sep 30
2594 2661 -8:00 - PST 1942 Apr 24
2595 2662 -8:00 1:00 PWT 1945 Aug 14 23:00u
2596 2663 -8:00 1:00 PPT 1945 Nov 12 # Peace
2597 2664 -8:00 - PST 1948 Apr 5
2598 2665 -8:00 1:00 PDT 1949 Jan 14
2599 2666 -8:00 - PST 1954
2600 2667 -8:00 CA P%sT 1961
2601 2668 -8:00 - PST 1976
2602 2669 -8:00 US P%sT 1996
2603 2670 -8:00 Mexico P%sT 2001
2604 2671 -8:00 US P%sT 2002 Feb 20
2605 2672 -8:00 Mexico P%sT 2010
2606 2673 -8:00 US P%sT
2607 2674 # From Paul Eggert (2006-03-22):
2608 2675 # Formerly there was an America/Ensenada zone, which differed from
2609 2676 # America/Tijuana only in that it did not observe DST from 1976
2610 2677 # through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2611 2678 # Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2612 2679 # that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and
2613 2680 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2614 2681 # DST-observance was a town-by-town matter back then. This concerns
2615 2682 # data after 1970 so most likely there should be at least one Zone
2616 2683 # other than America/Tijuana for Baja, but it's not clear yet what its
2617 2684 # name or contents should be.
2618 2685 #
2619 2686 # From Paul Eggert (2015-10-08):
2620 2687 # Formerly there was an America/Santa_Isabel zone, but this appears to
2621 2688 # have come from a misreading of
2622 2689 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2623 2690 # It has been moved to the 'backward' file.
2624 2691 #
2625 2692 #
2626 2693 # Revillagigedo Is
2627 2694 # no information
2628 2695
2629 2696 ###############################################################################
2630 2697
2631 2698 # Anguilla
2632 2699 # Antigua and Barbuda
2633 2700 # See America/Port_of_Spain.
2634 2701
2635 2702 # Bahamas
2636 2703 #
2637 2704 # For 1899 Milne gives -5:09:29.5; round that.
2638 2705 #
2639 2706 # From Sue Williams (2006-12-07):
2640 2707 # The Bahamas announced about a month ago that they plan to change their DST
2641 2708 # rules to sync with the U.S. starting in 2007....
2642 2709 # http://www.jonesbahamas.com/?c=45&a=10412
2643 2710
2644 2711 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2645 2712 Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2646 2713 Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2647 2714 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2648 2715 Zone America/Nassau -5:09:30 - LMT 1912 Mar 2
2649 2716 -5:00 Bahamas E%sT 1976
2650 2717 -5:00 US E%sT
2651 2718
2652 2719 # Barbados
2653 2720
2654 2721 # For 1899 Milne gives -3:58:29.2; round that.
2655 2722
2656 2723 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2657 2724 Rule Barb 1977 only - Jun 12 2:00 1:00 D
2658 2725 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2659 2726 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2660 2727 Rule Barb 1979 only - Sep 30 2:00 0 S
2661 2728 Rule Barb 1980 only - Sep 25 2:00 0 S
2662 2729 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2663 2730 Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2664 2731 -3:58:29 - BMT 1932 # Bridgetown Mean Time
2665 2732 -4:00 Barb A%sT
2666 2733
2667 2734 # Belize
2668 2735 # Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2669 2736 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2670 2737 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2671 2738 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2672 2739 Rule Belize 1973 only - Dec 5 0:00 1:00 D
2673 2740 Rule Belize 1974 only - Feb 9 0:00 0 S
2674 2741 Rule Belize 1982 only - Dec 18 0:00 1:00 D
2675 2742 Rule Belize 1983 only - Feb 12 0:00 0 S
2676 2743 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2677 2744 Zone America/Belize -5:52:48 - LMT 1912 Apr
2678 2745 -6:00 Belize C%sT
2679 2746
2680 2747 # Bermuda
2681 2748
2682 2749 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2683 2750 # Bermuda dockyard, Ireland I; round that.
2684 2751
2685 2752 # From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2686 2753
2687 2754 # Next year, however, clocks in the US will go forward on the second Sunday
2688 2755 # in March, until the first Sunday in November. And, after the Time Zone
2689 2756 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2690 2757 # Friday, the same thing will happen in Bermuda.
2691 2758 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2692 2759
2693 2760 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2694 2761 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2695 2762 -4:00 - AST 1974 Apr 28 2:00
2696 2763 -4:00 Canada A%sT 1976
2697 2764 -4:00 US A%sT
2698 2765
2699 2766 # Cayman Is
2700 2767 # See America/Panama.
2701 2768
2702 2769 # Costa Rica
2703 2770
2704 2771 # Milne gives -5:36:13.3 as San José mean time; round to nearest.
2705 2772
2706 2773 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2707 2774 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2708 2775 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2709 2776 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2710 2777 # IATA SSIM (1991-09) says the following was at 1:00;
2711 2778 # go with Shanks & Pottenger.
2712 2779 Rule CR 1991 only - Jul 1 0:00 0 S
2713 2780 Rule CR 1992 only - Mar 15 0:00 0 S
2714 2781 # There are too many San Josés elsewhere, so we'll use 'Costa Rica'.
2715 2782 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2716 2783 Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José
2717 2784 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time
2718 2785 -6:00 CR C%sT
2719 2786 # Coco
2720 2787 # no information; probably like America/Costa_Rica
2721 2788
2722 2789 # Cuba
2723 2790
2724 2791 # From Paul Eggert (2013-02-21):
2725 2792 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2726 2793 # for the port, and -5:30 for meteorological observations.
2727 2794 # For now, stick with Shanks & Pottenger.
2728 2795
2729 2796 # From Arthur David Olson (1999-03-29):
2730 2797 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2731 2798 # the Cuban National Team and the Baltimore Orioles was carried live on
2732 2799 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2733 2800 # During the game, play-by-play announcer Jim Hunter noted that
2734 2801 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2735 2802 # Time today." (The "two hour" remark referred to losing one hour of
2736 2803 # sleep on 1999-03-28 - when the announcers were in Cuba as it switched
2737 2804 # to DST - and one more hour on 1999-04-04 - when the announcers will have
2738 2805 # returned to Baltimore, which switches on that date.)
2739 2806
2740 2807 # From Steffen Thorsen (2013-11-11):
2741 2808 # DST start in Cuba in 2004 ... does not follow the same rules as the
2742 2809 # years before. The correct date should be Sunday 2004-03-28 00:00 ...
2743 2810 # https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html
2744 2811
2745 2812 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
2746 2813 # Cuba is not going back to standard time this year.
2747 2814 # From Paul Eggert (2006-03-22):
2748 2815 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2749 2816 # says that it's due to a problem at the Antonio Guiteras
2750 2817 # thermoelectric plant, and says "This October there will be no return
2751 2818 # to normal hours (after daylight saving time)".
2752 2819 # For now, let's assume that it's a temporary measure.
2753 2820
2754 2821 # From Carlos A. Carnero Delgado (2005-11-12):
2755 2822 # This year (just like in 2004-2005) there's no change in time zone
2756 2823 # adjustment in Cuba. We will stay in daylight saving time:
2757 2824 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2758 2825
2759 2826 # From Jesper Nørgaard Welen (2006-10-21):
2760 2827 # An article in GRANMA INTERNACIONAL claims that Cuba will end
2761 2828 # the 3 years of permanent DST next weekend, see
2762 2829 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2763 2830 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2764 2831 # watches should be set back one hour - going back to 00:00 hours - returning
2765 2832 # to the normal schedule....
2766 2833
2767 2834 # From Paul Eggert (2007-03-02):
2768 2835 # <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday,
2769 2836 # says Cuban clocks will advance at midnight on March 10.
2770 2837 # For lack of better information, assume Cuba will use US rules,
2771 2838 # except that it switches at midnight standard time as usual.
2772 2839 #
2773 2840 # From Steffen Thorsen (2007-10-25):
2774 2841 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2775 2842 # earlier - on the last Sunday of October, just like in 2006.
2776 2843 #
2777 2844 # He supplied these references:
2778 2845 #
2779 2846 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2780 2847 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2781 2848 #
2782 2849 # From Alex Krivenyshev (2007-10-25):
2783 2850 # Here is also article from Granma (Cuba):
2784 2851 #
2785 2852 # Regirá el Horario Normal desde el próximo domingo 28 de octubre
2786 2853 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2787 2854 #
2788 2855 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2789 2856
2790 2857 # From Arthur David Olson (2008-03-09):
2791 2858 # I'm in Maryland which is now observing United States Eastern Daylight
2792 2859 # Time. At 9:44 local time I used RealPlayer to listen to
2793 2860 # http://media.enet.cu/radioreloj
2794 2861 # a Cuban information station, and heard
2795 2862 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2796 2863 # indicating that Cuba is still on standard time.
2797 2864
2798 2865 # From Steffen Thorsen (2008-03-12):
2799 2866 # It seems that Cuba will start DST on Sunday, 2007-03-16...
2800 2867 # It was announced yesterday, according to this source (in Spanish):
2801 2868 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2802 2869 #
2803 2870 # Some more background information is posted here:
2804 2871 # http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2805 2872 #
2806 2873 # The article also says that Cuba has been observing DST since 1963,
2807 2874 # while Shanks (and tzdata) has 1965 as the first date (except in the
2808 2875 # 1940's). Many other web pages in Cuba also claim that it has been
2809 2876 # observed since 1963, but with the exception of 1970 - an exception
2810 2877 # which is not present in tzdata/Shanks. So there is a chance we need to
2811 2878 # change some historic records as well.
2812 2879 #
2813 2880 # One example:
2814 2881 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2815 2882
2816 2883 # From Jesper Nørgaard Welen (2008-03-13):
2817 2884 # The Cuban time change has just been confirmed on the most authoritative
2818 2885 # web site, the Granma. Please check out
2819 2886 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2820 2887 #
2821 2888 # Basically as expected after Steffen Thorsen's information, the change
2822 2889 # will take place midnight between Saturday and Sunday.
2823 2890
2824 2891 # From Arthur David Olson (2008-03-12):
2825 2892 # Assume Sun>=15 (third Sunday) going forward.
2826 2893
2827 2894 # From Alexander Krivenyshev (2009-03-04)
2828 2895 # According to the Radio Reloj - Cuba will start Daylight Saving Time on
2829 2896 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2830 2897 # not on midnight March 14 / March 15 as previously thought.
2831 2898 #
2832 2899 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2833 2900 # (in Spanish)
2834 2901
2835 2902 # From Arthur David Olson (2009-03-09)
2836 2903 # I listened over the Internet to
2837 2904 # http://media.enet.cu/readioreloj
2838 2905 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2839 2906 # the time was announced as "diez cinco" - the same time as here, indicating
2840 2907 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
2841 2908
2842 2909 # From Steffen Thorsen (2011-03-08):
2843 2910 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2844 2911 # this year. Nothing about the end date known so far (if that has
2845 2912 # changed at all).
2846 2913 #
2847 2914 # Source:
2848 2915 # http://granma.co.cu/2011/03/08/nacional/artic01.html
2849 2916 #
2850 2917 # Our info:
2851 2918 # http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2852 2919 #
2853 2920 # From Steffen Thorsen (2011-10-30)
2854 2921 # Cuba will end DST two weeks later this year. Instead of going back
2855 2922 # tonight, it has been delayed to 2011-11-13 at 01:00.
2856 2923 #
2857 2924 # One source (Spanish)
2858 2925 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2859 2926 #
2860 2927 # Our page:
2861 2928 # http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2862 2929 #
2863 2930 # From Steffen Thorsen (2012-03-01)
2864 2931 # According to Radio Reloj, Cuba will start DST on Midnight between March
2865 2932 # 31 and April 1.
2866 2933 #
2867 2934 # Radio Reloj has the following info (Spanish):
2868 2935 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2869 2936 #
2870 2937 # Our info on it:
2871 2938 # http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2872 2939
2873 2940 # From Steffen Thorsen (2012-11-03):
2874 2941 # Radio Reloj and many other sources report that Cuba is changing back
2875 2942 # to standard time on 2012-11-04:
2876 2943 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2877 2944 # From Paul Eggert (2012-11-03):
2878 2945 # For now, assume the future rule is first Sunday in November.
2879 2946
2880 2947 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2881 2948 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2882 2949 Rule Cuba 1928 only - Oct 10 0:00 0 S
2883 2950 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2884 2951 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2885 2952 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2886 2953 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2887 2954 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2888 2955 Rule Cuba 1965 only - Sep 30 0:00 0 S
2889 2956 Rule Cuba 1966 only - May 29 0:00 1:00 D
2890 2957 Rule Cuba 1966 only - Oct 2 0:00 0 S
2891 2958 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2892 2959 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2893 2960 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2894 2961 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2895 2962 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2896 2963 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2897 2964 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2898 2965 Rule Cuba 1978 only - May 7 0:00 1:00 D
2899 2966 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2900 2967 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2901 2968 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2902 2969 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2903 2970 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2904 2971 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2905 2972 Rule Cuba 1996 only - Oct 6 0:00s 0 S
2906 2973 Rule Cuba 1997 only - Oct 12 0:00s 0 S
2907 2974 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2908 2975 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2909 2976 Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D
2910 2977 Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D
2911 2978 Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2912 2979 Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2913 2980 Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2914 2981 Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2915 2982 Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2916 2983 Rule Cuba 2011 only - Nov 13 0:00s 0 S
2917 2984 Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2918 2985 Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2919 2986 Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2920 2987
2921 2988 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2922 2989 Zone America/Havana -5:29:28 - LMT 1890
2923 2990 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2924 2991 -5:00 Cuba C%sT
2925 2992
2926 2993 # Dominica
2927 2994 # See America/Port_of_Spain.
2928 2995
2929 2996 # Dominican Republic
2930 2997
2931 2998 # From Steffen Thorsen (2000-10-30):
2932 2999 # Enrique Morales reported to me that the Dominican Republic has changed the
2933 3000 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2934 3001 # http://www.listin.com.do/antes/261000/republica/princi.html
2935 3002
2936 3003 # From Paul Eggert (2000-12-04):
2937 3004 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2938 3005
2939 3006 # From Rives McDow (2000-12-01):
2940 3007 # Dominican Republic changed its mind and presidential decree on Tuesday,
2941 3008 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2942 3009 # Dominican Republic will be reverting to 8 hours from the International Date
2943 3010 # Line, and will not be using DST in the foreseeable future. The reason they
2944 3011 # decided to use DST was to be in synch with Puerto Rico, who was also going
2945 3012 # to implement DST. When Puerto Rico didn't implement DST, the president
2946 3013 # decided to revert.
2947 3014
2948 3015
2949 3016 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2950 3017 Rule DR 1966 only - Oct 30 0:00 1:00 D
2951 3018 Rule DR 1967 only - Feb 28 0:00 0 S
2952 3019 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2953 3020 Rule DR 1970 only - Feb 21 0:00 0 S
2954 3021 Rule DR 1971 only - Jan 20 0:00 0 S
2955 3022 Rule DR 1972 1974 - Jan 21 0:00 0 S
2956 3023 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2957 3024 Zone America/Santo_Domingo -4:39:36 - LMT 1890
2958 3025 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2959 3026 -5:00 DR E%sT 1974 Oct 27
2960 3027 -4:00 - AST 2000 Oct 29 2:00
2961 3028 -5:00 US E%sT 2000 Dec 3 1:00
2962 3029 -4:00 - AST
2963 3030
2964 3031 # El Salvador
2965 3032
2966 3033 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2967 3034 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2968 3035 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2969 3036 # There are too many San Salvadors elsewhere, so use America/El_Salvador
2970 3037 # instead of America/San_Salvador.
2971 3038 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2972 3039 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2973 3040 -6:00 Salv C%sT
2974 3041
2975 3042 # Grenada
2976 3043 # Guadeloupe
2977 3044 # St Barthélemy
2978 3045 # St Martin (French part)
2979 3046 # See America/Port_of_Spain.
2980 3047
2981 3048 # Guatemala
2982 3049 #
2983 3050 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2984 3051 # Diario Co Latino, at
2985 3052 # <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>,
2986 3053 # says in an article dated 2006-04-19 that the Guatemalan government had
2987 3054 # decided on that date to advance official time by 60 minutes, to lessen the
2988 3055 # impact of the elevated cost of oil.... Daylight saving time will last from
2989 3056 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2990 3057 # From Paul Eggert (2006-06-22):
2991 3058 # The Ministry of Energy and Mines, press release CP-15/2006
2992 3059 # (2006-04-19), says DST ends at 24:00. See
2993 3060 # http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf
2994 3061
2995 3062 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2996 3063 Rule Guat 1973 only - Nov 25 0:00 1:00 D
2997 3064 Rule Guat 1974 only - Feb 24 0:00 0 S
2998 3065 Rule Guat 1983 only - May 21 0:00 1:00 D
2999 3066 Rule Guat 1983 only - Sep 22 0:00 0 S
3000 3067 Rule Guat 1991 only - Mar 23 0:00 1:00 D
3001 3068 Rule Guat 1991 only - Sep 7 0:00 0 S
3002 3069 Rule Guat 2006 only - Apr 30 0:00 1:00 D
3003 3070 Rule Guat 2006 only - Oct 1 0:00 0 S
3004 3071 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3005 3072 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
3006 3073 -6:00 Guat C%sT
3007 3074
3008 3075 # Haiti
3009 3076 # From Gwillim Law (2005-04-15):
3010 3077 # Risto O. Nykänen wrote me that Haiti is now on DST.
3011 3078 # I searched for confirmation, and I found a press release
3012 3079 # on the Web page of the Haitian Consulate in Chicago (2005-03-31),
3013 3080 # <http://www.haitianconsulate.org/time.doc>. Translated from French, it says:
3014 3081 #
3015 3082 # "The Prime Minister's Communication Office notifies the public in general
3016 3083 # and the press in particular that, following a decision of the Interior
3017 3084 # Ministry and the Territorial Collectivities [I suppose that means the
3018 3085 # provinces], Haiti will move to Eastern Daylight Time in the night from next
3019 3086 # Saturday the 2nd to Sunday the 3rd.
3020 3087 #
3021 3088 # "Consequently, the Prime Minister's Communication Office wishes to inform
3022 3089 # the population that the country's clocks will be set forward one hour
3023 3090 # starting at midnight. This provision will hold until the last Saturday in
3024 3091 # October 2005.
3025 3092 #
3026 3093 # "Port-au-Prince, March 31, 2005"
3027 3094 #
3028 3095 # From Steffen Thorsen (2006-04-04):
3029 3096 # I have been informed by users that Haiti observes DST this year like
3030 3097 # last year, so the current "only" rule for 2005 might be changed to a
3031 3098 # "max" rule or to last until 2006. (Who knows if they will observe DST
3032 3099 # next year or if they will extend their DST like US/Canada next year).
3033 3100 #
3034 3101 # I have found this article about it (in French):
3035 3102 # http://www.haitipressnetwork.com/news.cfm?articleID=7612
3036 3103 #
3037 3104 # The reason seems to be an energy crisis.
3038 3105
3039 3106 # From Stephen Colebourne (2007-02-22):
3040 3107 # Some IATA info: Haiti won't be having DST in 2007.
3041 3108
3042 3109 # From Steffen Thorsen (2012-03-11):
3043 3110 # According to several news sources, Haiti will observe DST this year,
3044 3111 # apparently using the same start and end date as USA/Canada.
3045 3112 # So this means they have already changed their time.
3046 3113 #
3047 3114 # http://www.alterpresse.org/spip.php?article12510
3048 3115 # http://radiovision2000haiti.net/home/?p=13253
3049 3116 #
3050 3117 # From Arthur David Olson (2012-03-11):
3051 3118 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3052 3119 # 3:00 a.m. rather than the traditional Haitian jump at midnight.
3053 3120 # Assume a US-style fall back as well.
3054 3121
3055 3122 # From Steffen Thorsen (2013-03-10):
3056 3123 # It appears that Haiti is observing DST this year as well, same rules
3057 3124 # as US/Canada. They did it last year as well, and it looks like they
3058 3125 # are going to observe DST every year now...
3059 3126 #
3060 3127 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3061 3128 # http://www.canalplushaiti.net/?p=6714
3062 3129
3063 3130 # From Steffen Thorsen (2016-03-12):
3064 3131 # Jean Antoine, editor of www.haiti-reference.com informed us that Haiti
3065 3132 # are not going on DST this year. Several other resources confirm this: ...
3066 3133 # http://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html
3067 3134 # http://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/
3068 3135 # http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/
3069 3136
3070 3137 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3071 3138 Rule Haiti 1983 only - May 8 0:00 1:00 D
3072 3139 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3073 3140 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3074 3141 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3075 3142 # Go with IATA.
3076 3143 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3077 3144 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3078 3145 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3079 3146 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3080 3147 Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D
3081 3148 Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S
3082 3149 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3083 3150 Zone America/Port-au-Prince -4:49:20 - LMT 1890
3084 3151 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3085 3152 -5:00 Haiti E%sT
3086 3153
3087 3154 # Honduras
3088 3155 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3089 3156
3090 3157 # From Paul Eggert (2006-05-05):
3091 3158 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3092 3159 # saying Honduras will start using DST midnight Saturday, effective 4
3093 3160 # months until September. La Tribuna reported today
3094 3161 # <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3095 3162 # of Honduras, refused to back down on this.
3096 3163
3097 3164 # From Jesper Nørgaard Welen (2006-08-08):
3098 3165 # It seems that Honduras has returned from DST to standard time this Monday at
3099 3166 # 00:00 hours (prolonging Sunday to 25 hours duration).
3100 3167 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3101 3168
3102 3169 # From Paul Eggert (2006-08-08):
3103 3170 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08).
3104 3171 # http://www.elheraldo.hn/nota.php?nid=54941&sec=12
3105 3172 # It mentions executive decree 18-2006.
3106 3173
3107 3174 # From Steffen Thorsen (2006-08-17):
3108 3175 # Honduras will observe DST from 2007 to 2009, exact dates are not
3109 3176 # published, I have located this authoritative source:
3110 3177 # http://www.presidencia.gob.hn/noticia.aspx?nId=47
3111 3178
3112 3179 # From Steffen Thorsen (2007-03-30):
3113 3180 # http://www.laprensahn.com/pais_nota.php?id04962=7386
3114 3181 # So it seems that Honduras will not enter DST this year....
3115 3182
3116 3183 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3117 3184 Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3118 3185 Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3119 3186 Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3120 3187 Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3121 3188 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3122 3189 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3123 3190 -6:00 Hond C%sT
3124 3191 #
3125 3192 # Great Swan I ceded by US to Honduras in 1972
3126 3193
3127 3194 # Jamaica
3128 3195 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3129 3196 # unspecified official document, and says "This time is used throughout the
3130 3197 # island". Go with Milne. Round to the nearest second as required by zic.
3131 3198 #
3132 3199 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
3133 3200 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
3134 3201 # Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that
3135 3202 # Manley's supporters associated this act with Manley's nickname "Joshua"
3136 3203 # (recall that in the Bible the sun stood still at Joshua's request),
3137 3204 # and with the Rod of Correction which Manley said he had received from
3138 3205 # Haile Selassie, Emperor of Ethiopia. See:
3139 3206 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
3140 3207 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
3141 3208 #
3142 3209 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3143 3210 Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3144 3211 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3145 3212 -5:00 - EST 1974
3146 3213 -5:00 US E%sT 1984
3147 3214 -5:00 - EST
3148 3215
3149 3216 # Martinique
3150 3217 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3151 3218 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3152 3219 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3153 3220 -4:00 - AST 1980 Apr 6
3154 3221 -4:00 1:00 ADT 1980 Sep 28
3155 3222 -4:00 - AST
3156 3223
3157 3224 # Montserrat
3158 3225 # See America/Port_of_Spain.
3159 3226
3160 3227 # Nicaragua
3161 3228 #
3162 3229 # This uses Shanks & Pottenger for times before 2005.
3163 3230 #
3164 3231 # From Steffen Thorsen (2005-04-12):
3165 3232 # I've got reports from 8 different people that Nicaragua just started
3166 3233 # DST on Sunday 2005-04-10, in order to save energy because of
3167 3234 # expensive petroleum. The exact end date for DST is not yet
3168 3235 # announced, only "September" but some sites also say "mid-September".
3169 3236 # Some background information is available on the President's official site:
3170 3237 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3171 3238 # The Decree, no 23-2005 is available here:
3172 3239 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
3173 3240 #
3174 3241 # From Paul Eggert (2005-05-01):
3175 3242 # The decree doesn't say anything about daylight saving, but for now let's
3176 3243 # assume that it is daylight saving....
3177 3244 #
3178 3245 # From Gwillim Law (2005-04-21):
3179 3246 # The Associated Press story on the time change, which can be found at
3180 3247 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3181 3248 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3182 3249 # time that a change of clocks was applied to save energy was in the year 2000
3183 3250 # during the Arnoldo Alemán administration."...
3184 3251 # The northamerica file says that Nicaragua has been on UTC-6 continuously
3185 3252 # since December 1998. I wasn't able to find any details of Nicaraguan time
3186 3253 # changes in 2000. Perhaps a note could be added to the northamerica file, to
3187 3254 # the effect that we have indirect evidence that DST was observed in 2000.
3188 3255 #
3189 3256 # From Jesper Nørgaard Welen (2005-11-02):
3190 3257 # Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3191 3258 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3192 3259 # (2005-09-26)
3193 3260 #
3194 3261 # From Jesper Nørgaard Welen (2006-05-05):
3195 3262 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3196 3263 # (my informal translation)
3197 3264 # By order of the president of the republic, Enrique Bolaños, Nicaragua
3198 3265 # advanced by sixty minutes their official time, yesterday at 2 in the
3199 3266 # morning, and will stay that way until 30th of September.
3200 3267 #
3201 3268 # From Jesper Nørgaard Welen (2006-09-30):
3202 3269 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3203 3270 # My informal translation runs:
3204 3271 # The natural sun time is restored in all the national territory, in that the
3205 3272 # time is returned one hour at 01:00 am of October 1 of 2006.
3206 3273 #
3207 3274 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3208 3275 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3209 3276 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3210 3277 Rule Nic 2005 only - Apr 10 0:00 1:00 D
3211 3278 Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3212 3279 Rule Nic 2006 only - Apr 30 2:00 1:00 D
3213 3280 Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3214 3281 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3215 3282 Zone America/Managua -5:45:08 - LMT 1890
3216 3283 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3217 3284 -6:00 - CST 1973 May
3218 3285 -5:00 - EST 1975 Feb 16
3219 3286 -6:00 Nic C%sT 1992 Jan 1 4:00
3220 3287 -5:00 - EST 1992 Sep 24
3221 3288 -6:00 - CST 1993
3222 3289 -5:00 - EST 1997
3223 3290 -6:00 Nic C%sT
3224 3291
3225 3292 # Panama
3226 3293 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3227 3294 Zone America/Panama -5:18:08 - LMT 1890
3228 3295 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time
3229 3296 -5:00 - EST
3230 3297 Link America/Panama America/Cayman
3231 3298
3232 3299 # Puerto Rico
3233 3300 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3234 3301 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3235 3302 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3236 3303 -4:00 - AST 1942 May 3
3237 3304 -4:00 US A%sT 1946
3238 3305 -4:00 - AST
3239 3306
3240 3307 # St Kitts-Nevis
3241 3308 # St Lucia
3242 3309 # See America/Port_of_Spain.
3243 3310
3244 3311 # St Pierre and Miquelon
3245 3312 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3246 3313 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3247 3314 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3248 3315 -4:00 - AST 1980 May
3249 3316 -3:00 - PMST 1987 # Pierre & Miquelon Time
3250 3317 -3:00 Canada PM%sT
3251 3318
3252 3319 # St Vincent and the Grenadines
3253 3320 # See America/Port_of_Spain.
3254 3321
3255 3322 # Turks and Caicos
3256 3323 #
3257 3324 # From Chris Dunn in
3258 3325 # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007
3259 3326 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3260 3327 # daylight saving dates for time changes have been adjusted to match
3261 3328 # the recent U.S. change of dates.
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3262 3329 #
3263 3330 # From Brian Inglis (2007-04-28):
3264 3331 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3265 3332 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3266 3333 # rows before that there is an out of date entry for Oct:
3267 3334 # "Eastern Standard Times Begins 2007
3268 3335 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3269 3336 # indicating that the normal ET rules are followed.
3270 3337 #
3271 3338 # From Paul Eggert (2014-08-19):
3272 -# The 2014-08-13 Cabinet meeting decided to stay on UTC-4 year-round. See:
3339 +# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See:
3273 3340 # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
3274 3341 # Model this as a switch from EST/EDT to AST ...
3275 3342 # From Chris Walton (2014-11-04):
3276 3343 # ... the TCI government appears to have delayed the switch to
3277 3344 # "permanent daylight saving time" by one year....
3278 3345 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
3279 3346 #
3280 3347 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3281 3348 Zone America/Grand_Turk -4:44:32 - LMT 1890
3282 3349 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3283 3350 -5:00 - EST 1979
3284 3351 -5:00 US E%sT 2015 Nov Sun>=1 2:00
3285 3352 -4:00 - AST
3286 3353
3287 3354 # British Virgin Is
3288 3355 # Virgin Is
3289 3356 # See America/Port_of_Spain.
3290 3357
3291 3358
3292 3359 # Local Variables:
3293 3360 # coding: utf-8
3294 3361 # End:
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