8 # tz@iana.org for general use in the future). For more, please see
9 # the file CONTRIBUTING in the tz distribution.
10
11 # From Paul Eggert (1999-03-22):
12 # A reliable and entertaining source about time zones is
13 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
14
15 ###############################################################################
16
17 # United States
18
19 # From Paul Eggert (1999-03-31):
20 # Howse writes (pp 121-125) that time zones were invented by
21 # Professor Charles Ferdinand Dowd (1825-1904),
22 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
23 # His pamphlet "A System of National Time for Railroads" (1870)
24 # was the result of his proposals at the Convention of Railroad Trunk Lines
25 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
26 # but in 1872-05 he moved the proposed origin to Greenwich.
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
54 # From Paul Eggert (2005-04-16):
55 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
56 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
57
58 # From Paul Eggert (2006-03-22):
59 # A good source for time zone historical data in the US is
60 # Thomas G. Shanks, The American Atlas (5th edition),
61 # San Diego: ACS Publications, Inc. (1991).
62 # Make sure you have the errata sheet; the book is somewhat useless without it.
407 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
408 # Officially this switch also included part of Sioux County, and
409 # Jones, Mellette, and Todd Counties in South Dakota;
410 # but in practice these other counties were already observing central time.
411 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
412 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
413 -7:00 US M%sT 2003 Oct 26 2:00
414 -6:00 US C%sT
415
416 # From Josh Findley (2011-01-21):
417 # ...it appears that Mercer County, North Dakota, changed from the
418 # mountain time zone to the central time zone at the last transition from
419 # daylight-saving to standard time (on Nov. 7, 2010):
420 # https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
421 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
422
423 # From Andy Lipscomb (2011-01-24):
424 # ...according to the Census Bureau, the largest city is Beulah (although
425 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
426 # largest city in Mercer County). Google Maps places Beulah's city hall
427 # at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
428 # of 6h47'07".
429
430 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
431 -7:00 US M%sT 2010 Nov 7 2:00
432 -6:00 US C%sT
433
434 # US mountain time, represented by Denver
435 #
436 # Colorado, far western Kansas, Montana, western
437 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
438 # New Mexico, southwestern North Dakota,
439 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
440 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
441 #
442 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
443 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
444 Rule Denver 1920 only - Oct lastSun 2:00 0 S
445 Rule Denver 1921 only - May 22 2:00 0 S
446 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
447 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
448 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
449 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
450 -7:00 US M%sT 1920
451 -7:00 Denver M%sT 1942
452 -7:00 US M%sT 1946
453 -7:00 Denver M%sT 1967
454 -7:00 US M%sT
455
456 # US Pacific time, represented by Los Angeles
457 #
458 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
459 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
460 # north of the Salmon River, and the towns of Burgdorf and Warren),
461 # Nevada (except West Wendover), Oregon (except the northern 3/4 of
462 # Malheur county), and Washington
463
464 # From Paul Eggert (2016-08-20):
465 # In early February 1948, in response to California's electricity shortage,
466 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
467 # causing electric clocks to lose six minutes per day. (This did not change
468 # legal time, and is not part of the data here.) See:
469 # Ross SA. An energy crisis from the past: Northern California in 1948.
470 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
471 # 1973-11. https://escholarship.org/uc/item/8x22k30c
472 #
473 # In another measure to save electricity, DST was instituted from 1948-03-14
474 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
475 # the fallback transition earlier. See pages 3-4 of:
476 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
477 #
478 # In response:
479 #
480 # Governor Warren received a torrent of objecting mail, and it is not too much
481 # to speculate that the objections to Daylight Saving Time were one important
939 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
940 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
941 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
942 -6:00 US C%sT 1946
943 -6:00 Pulaski C%sT 1961 Apr 30 2:00
944 -5:00 - EST 1969
945 -5:00 US E%sT 1971
946 -5:00 - EST 2006 Apr 2 2:00
947 -6:00 US C%sT 2007 Mar 11 2:00
948 -5:00 US E%sT
949 #
950 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
951 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
952 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
953 -6:00 US C%sT 1954 Apr 25 2:00
954 -5:00 - EST 1969
955 -5:00 US E%sT 1973
956 -5:00 - EST 2006
957 -5:00 US E%sT
958
959 # Part of Kentucky left its clocks alone in 1974.
960 # This also includes Clark, Floyd, and Harrison counties in Indiana.
961 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
962 Rule Louisville 1921 only - May 1 2:00 1:00 D
963 Rule Louisville 1921 only - Sep 1 2:00 0 S
964 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
965 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
966 Rule Louisville 1946 only - Jun 2 2:00 0 S
967 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
968 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
969 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
970 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
971 -6:00 US C%sT 1921
972 -6:00 Louisville C%sT 1942
973 -6:00 US C%sT 1946
974 -6:00 Louisville C%sT 1961 Jul 23 2:00
975 -5:00 - EST 1968
976 -5:00 US E%sT 1974 Jan 6 2:00
977 -6:00 1:00 CDT 1974 Oct 27 2:00
978 -5:00 US E%sT
3247 -6:00 Hond C%sT
3248 #
3249 # Great Swan I ceded by US to Honduras in 1972
3250
3251 # Jamaica
3252 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3253 # unspecified official document, and says "This time is used throughout the
3254 # island". Go with Milne. Round to the nearest second as required by zic.
3255 #
3256 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
3257 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
3258 # Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that
3259 # Manley's supporters associated this act with Manley's nickname "Joshua"
3260 # (recall that in the Bible the sun stood still at Joshua's request),
3261 # and with the Rod of Correction which Manley said he had received from
3262 # Haile Selassie, Emperor of Ethiopia. See:
3263 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
3264 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
3265 #
3266 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3267 Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3268 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3269 -5:00 - EST 1974
3270 -5:00 US E%sT 1984
3271 -5:00 - EST
3272
3273 # Martinique
3274 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3275 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3276 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3277 -4:00 - AST 1980 Apr 6
3278 -4:00 1:00 ADT 1980 Sep 28
3279 -4:00 - AST
3280
3281 # Montserrat
3282 # See America/Port_of_Spain.
3283
3284 # Nicaragua
3285 #
3286 # This uses Shanks & Pottenger for times before 2005.
3287 #
3288 # From Steffen Thorsen (2005-04-12):
3398 # Model this as a switch from EST/EDT to AST ...
3399 # From Chris Walton (2014-11-04):
3400 # ... the TCI government appears to have delayed the switch to
3401 # "permanent daylight saving time" by one year....
3402 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
3403 #
3404 # From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen:
3405 # ... agreed to the reintroduction in TCI of Daylight Saving Time (DST)
3406 # during the summer months and Standard Time, also known as Local
3407 # Time, during the winter months with effect from April 2018 ...
3408 # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3
3409 #
3410 # From Paul Eggert (2017-08-26):
3411 # The date of effect of the spring 2018 change appears to be March 11,
3412 # which makes more sense. See: Hamilton D. Time change back
3413 # by March 2018 for TCI. Magnetic Media. 2017-08-25.
3414 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
3415 #
3416 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3417 Zone America/Grand_Turk -4:44:32 - LMT 1890
3418 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3419 -5:00 - EST 1979
3420 -5:00 US E%sT 2015 Nov Sun>=1 2:00
3421 -4:00 - AST 2018 Mar 11 3:00
3422 -5:00 US E%sT
3423
3424 # British Virgin Is
3425 # Virgin Is
3426 # See America/Port_of_Spain.
3427
3428
3429 # Local Variables:
3430 # coding: utf-8
3431 # End:
|
8 # tz@iana.org for general use in the future). For more, please see
9 # the file CONTRIBUTING in the tz distribution.
10
11 # From Paul Eggert (1999-03-22):
12 # A reliable and entertaining source about time zones is
13 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
14
15 ###############################################################################
16
17 # United States
18
19 # From Paul Eggert (1999-03-31):
20 # Howse writes (pp 121-125) that time zones were invented by
21 # Professor Charles Ferdinand Dowd (1825-1904),
22 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
23 # His pamphlet "A System of National Time for Railroads" (1870)
24 # was the result of his proposals at the Convention of Railroad Trunk Lines
25 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
26 # but in 1872-05 he moved the proposed origin to Greenwich.
27
28 # From Paul Eggert (2018-03-20):
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. That Sunday
40 # was called the "day of two noons", as some locations observed noon
41 # twice. Allen witnessed the transition in New York City, writing:
42 #
43 # I heard the bells of St. Paul's strike on the old time. Four
44 # minutes later, obedient to the electrical signal from the Naval
45 # Observatory ... the time-ball made its rapid descent, the chimes
46 # of old Trinity rang twelve measured strokes, and local time was
47 # abandoned, probably forever.
48 #
49 # Most of the US soon followed suit. See:
50 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
51 # http://dx.doi.org/10.2307/3105430
52
53 # From Paul Eggert (2005-04-16):
54 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
55 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
56
57 # From Paul Eggert (2006-03-22):
58 # A good source for time zone historical data in the US is
59 # Thomas G. Shanks, The American Atlas (5th edition),
60 # San Diego: ACS Publications, Inc. (1991).
61 # Make sure you have the errata sheet; the book is somewhat useless without it.
406 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
407 # Officially this switch also included part of Sioux County, and
408 # Jones, Mellette, and Todd Counties in South Dakota;
409 # but in practice these other counties were already observing central time.
410 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
411 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
412 -7:00 US M%sT 2003 Oct 26 2:00
413 -6:00 US C%sT
414
415 # From Josh Findley (2011-01-21):
416 # ...it appears that Mercer County, North Dakota, changed from the
417 # mountain time zone to the central time zone at the last transition from
418 # daylight-saving to standard time (on Nov. 7, 2010):
419 # https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
420 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
421
422 # From Andy Lipscomb (2011-01-24):
423 # ...according to the Census Bureau, the largest city is Beulah (although
424 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
425 # largest city in Mercer County). Google Maps places Beulah's city hall
426 # at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07".
427
428 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
429 -7:00 US M%sT 2010 Nov 7 2:00
430 -6:00 US C%sT
431
432 # US mountain time, represented by Denver
433 #
434 # Colorado, far western Kansas, Montana, western
435 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
436 # New Mexico, southwestern North Dakota,
437 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
438 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
439 #
440 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
441 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
442 Rule Denver 1920 only - Oct lastSun 2:00 0 S
443 Rule Denver 1921 only - May 22 2:00 0 S
444 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
445 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
446 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
447 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
448 -7:00 US M%sT 1920
449 -7:00 Denver M%sT 1942
450 -7:00 US M%sT 1946
451 -7:00 Denver M%sT 1967
452 -7:00 US M%sT
453
454 # US Pacific time, represented by Los Angeles
455 #
456 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
457 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
458 # north of the Salmon River, and the towns of Burgdorf and Warren),
459 # Nevada (except West Wendover), Oregon (except the northern ¾ of
460 # Malheur county), and Washington
461
462 # From Paul Eggert (2016-08-20):
463 # In early February 1948, in response to California's electricity shortage,
464 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
465 # causing electric clocks to lose six minutes per day. (This did not change
466 # legal time, and is not part of the data here.) See:
467 # Ross SA. An energy crisis from the past: Northern California in 1948.
468 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
469 # 1973-11. https://escholarship.org/uc/item/8x22k30c
470 #
471 # In another measure to save electricity, DST was instituted from 1948-03-14
472 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
473 # the fallback transition earlier. See pages 3-4 of:
474 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
475 #
476 # In response:
477 #
478 # Governor Warren received a torrent of objecting mail, and it is not too much
479 # to speculate that the objections to Daylight Saving Time were one important
937 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
938 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
939 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
940 -6:00 US C%sT 1946
941 -6:00 Pulaski C%sT 1961 Apr 30 2:00
942 -5:00 - EST 1969
943 -5:00 US E%sT 1971
944 -5:00 - EST 2006 Apr 2 2:00
945 -6:00 US C%sT 2007 Mar 11 2:00
946 -5:00 US E%sT
947 #
948 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
949 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
950 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
951 -6:00 US C%sT 1954 Apr 25 2:00
952 -5:00 - EST 1969
953 -5:00 US E%sT 1973
954 -5:00 - EST 2006
955 -5:00 US E%sT
956
957 # From Paul Eggert (2018-03-20):
958 # The Louisville & Nashville Railroad's 1883-11-18 change occurred at
959 # 10:00 old local time; train were supposed to come to a standstill
960 # for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not
961 # clear how this matched civil time in Louisville, so for now continue
962 # to assume Louisville switched at noon new local time, like New York.
963 #
964 # Part of Kentucky left its clocks alone in 1974.
965 # This also includes Clark, Floyd, and Harrison counties in Indiana.
966 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
967 Rule Louisville 1921 only - May 1 2:00 1:00 D
968 Rule Louisville 1921 only - Sep 1 2:00 0 S
969 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
970 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
971 Rule Louisville 1946 only - Jun 2 2:00 0 S
972 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
973 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
974 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
975 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
976 -6:00 US C%sT 1921
977 -6:00 Louisville C%sT 1942
978 -6:00 US C%sT 1946
979 -6:00 Louisville C%sT 1961 Jul 23 2:00
980 -5:00 - EST 1968
981 -5:00 US E%sT 1974 Jan 6 2:00
982 -6:00 1:00 CDT 1974 Oct 27 2:00
983 -5:00 US E%sT
3252 -6:00 Hond C%sT
3253 #
3254 # Great Swan I ceded by US to Honduras in 1972
3255
3256 # Jamaica
3257 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3258 # unspecified official document, and says "This time is used throughout the
3259 # island". Go with Milne. Round to the nearest second as required by zic.
3260 #
3261 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
3262 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
3263 # Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that
3264 # Manley's supporters associated this act with Manley's nickname "Joshua"
3265 # (recall that in the Bible the sun stood still at Joshua's request),
3266 # and with the Rod of Correction which Manley said he had received from
3267 # Haile Selassie, Emperor of Ethiopia. See:
3268 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
3269 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
3270 #
3271 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3272 Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston
3273 -5:07:10 - KMT 1912 Feb # Kingston Mean Time
3274 -5:00 - EST 1974
3275 -5:00 US E%sT 1984
3276 -5:00 - EST
3277
3278 # Martinique
3279 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3280 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3281 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3282 -4:00 - AST 1980 Apr 6
3283 -4:00 1:00 ADT 1980 Sep 28
3284 -4:00 - AST
3285
3286 # Montserrat
3287 # See America/Port_of_Spain.
3288
3289 # Nicaragua
3290 #
3291 # This uses Shanks & Pottenger for times before 2005.
3292 #
3293 # From Steffen Thorsen (2005-04-12):
3403 # Model this as a switch from EST/EDT to AST ...
3404 # From Chris Walton (2014-11-04):
3405 # ... the TCI government appears to have delayed the switch to
3406 # "permanent daylight saving time" by one year....
3407 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
3408 #
3409 # From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen:
3410 # ... agreed to the reintroduction in TCI of Daylight Saving Time (DST)
3411 # during the summer months and Standard Time, also known as Local
3412 # Time, during the winter months with effect from April 2018 ...
3413 # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3
3414 #
3415 # From Paul Eggert (2017-08-26):
3416 # The date of effect of the spring 2018 change appears to be March 11,
3417 # which makes more sense. See: Hamilton D. Time change back
3418 # by March 2018 for TCI. Magnetic Media. 2017-08-25.
3419 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
3420 #
3421 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3422 Zone America/Grand_Turk -4:44:32 - LMT 1890
3423 -5:07:10 - KMT 1912 Feb # Kingston Mean Time
3424 -5:00 - EST 1979
3425 -5:00 US E%sT 2015 Nov Sun>=1 2:00
3426 -4:00 - AST 2018 Mar 11 3:00
3427 -5:00 US E%sT
3428
3429 # British Virgin Is
3430 # Virgin Is
3431 # See America/Port_of_Spain.
3432
3433
3434 # Local Variables:
3435 # coding: utf-8
3436 # End:
|