1 # This file is in the public domain, so clarified as of
2 # 2009-05-17 by Arthur David Olson.
3
4 # This file is by no means authoritative; if you think you know better,
5 # go ahead and edit the file (and please send any changes to
6 # tz@iana.org for general use in the future). For more, please see
7 # the file CONTRIBUTING in the tz distribution.
8
9 # From Paul Eggert (2016-12-05):
10 #
11 # Unless otherwise specified, the source for data through 1990 is:
12 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
13 # San Diego: ACS Publications, Inc. (2003).
14 # Unfortunately this book contains many errors and cites no sources.
15 #
16 # Many years ago Gwillim Law wrote that a good source
17 # for time zone data was the International Air Transport
18 # Association's Standard Schedules Information Manual (IATA SSIM),
19 # published semiannually. Law sent in several helpful summaries
20 # of the IATA's data after 1990. Except where otherwise noted,
21 # IATA SSIM is the source for entries after 1990.
22 #
23 # For data circa 1899, a common source is:
24 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
25 # https://www.jstor.org/stable/1774359
26 #
27 # These tables use numeric abbreviations like -03 and -0330 for
28 # integer hour and minute UT offsets. Although earlier editions used
29 # alphabetic time zone abbreviations, these abbreviations were
30 # invented and did not reflect common practice.
31
32 ###############################################################################
33
34 ###############################################################################
35
36 # Argentina
37
38 # From Bob Devine (1988-01-28):
39 # Argentina: first Sunday in October to first Sunday in April since 1976.
40 # Double Summer time from 1969 to 1974. Switches at midnight.
41
42 # From U. S. Naval Observatory (1988-01-19):
43 # ARGENTINA 3 H BEHIND UTC
44
45 # From Hernan G. Otero (1995-06-26):
46 # I am sending modifications to the Argentine time zone table...
47 # AR was chosen because they are the ISO letters that represent Argentina.
48
49 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
50 Rule Arg 1930 only - Dec 1 0:00 1:00 S
51 Rule Arg 1931 only - Apr 1 0:00 0 -
52 Rule Arg 1931 only - Oct 15 0:00 1:00 S
53 Rule Arg 1932 1940 - Mar 1 0:00 0 -
54 Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
55 Rule Arg 1940 only - Jul 1 0:00 1:00 S
56 Rule Arg 1941 only - Jun 15 0:00 0 -
57 Rule Arg 1941 only - Oct 15 0:00 1:00 S
58 Rule Arg 1943 only - Aug 1 0:00 0 -
59 Rule Arg 1943 only - Oct 15 0:00 1:00 S
60 Rule Arg 1946 only - Mar 1 0:00 0 -
61 Rule Arg 1946 only - Oct 1 0:00 1:00 S
62 Rule Arg 1963 only - Oct 1 0:00 0 -
63 Rule Arg 1963 only - Dec 15 0:00 1:00 S
64 Rule Arg 1964 1966 - Mar 1 0:00 0 -
65 Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
66 Rule Arg 1967 only - Apr 2 0:00 0 -
67 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
68 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
69 Rule Arg 1974 only - Jan 23 0:00 1:00 S
70 Rule Arg 1974 only - May 1 0:00 0 -
71 Rule Arg 1988 only - Dec 1 0:00 1:00 S
72 #
73 # From Hernan G. Otero (1995-06-26):
74 # These corrections were contributed by InterSoft Argentina S.A.,
75 # obtaining the data from the:
76 # Talleres de Hidrografía Naval Argentina
77 # (Argentine Naval Hydrography Institute)
78 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
79 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
80 #
81 # From Hernan G. Otero (1995-06-26):
82 # From this moment on, the law that mandated the daylight saving
83 # time corrections was derogated and no more modifications
84 # to the time zones (for daylight saving) are now made.
85 #
86 # From Rives McDow (2000-01-10):
87 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
88 # which did not result in the switch of a time zone, as they stayed 9 hours
89 # from the International Date Line.
90 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
91 # From Paul Eggert (2007-12-28):
92 # DST was set to expire on March 5, not March 3, but since it was converted
93 # to standard time on March 3 it's more convenient for us to pretend that
94 # it ended on March 3.
95 Rule Arg 2000 only - Mar 3 0:00 0 -
96 #
97 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
98 # We just checked with our São Paulo office and they say the government of
99 # Argentina decided not to become one of the countries that go on or off DST.
100 # So Buenos Aires should be -3 hours from GMT at all times.
101 #
102 # From Fabián L. Arce Jofré (2000-04-04):
103 # The law that claimed DST for Argentina was derogated by President Fernando
104 # de la Rúa on March 2, 2000, because it would make people spend more energy
105 # in the winter time, rather than less. The change took effect on March 3.
106 #
107 # From Mariano Absatz (2001-06-06):
108 # one of the major newspapers here in Argentina said that the 1999
109 # Timezone Law (which never was effectively applied) will (would?) be
110 # in effect.... The article is at
111 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm
112 # ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted
113 # 1999-09-17, and published 1999-09-21. The official publication is at:
114 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
115 # Regretfully, you have to subscribe (and pay) for the on-line version....
116 #
117 # (2001-06-12):
118 # the timezone for Argentina will not change next Sunday.
119 # Apparently it will do so on Sunday 24th....
120 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm
121 #
122 # (2001-06-25):
123 # Last Friday (yes, the last working day before the date of the change), the
124 # Senate annulled the 1999 law that introduced the changes later postponed.
125 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
126 # It remains the vote of the Deputies..., but it will be the same....
127 # This kind of things had always been done this way in Argentina.
128 # We are still -03:00 all year round in all of the country.
129 #
130 # From Steffen Thorsen (2007-12-21):
131 # A user (Leonardo Chaim) reported that Argentina will adopt DST....
132 # all of the country (all Zone-entries) are affected. News reports like
133 # http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate
134 # that Argentina will use DST next year as well, from October to
135 # March, although exact rules are not given.
136 #
137 # From Jesper Nørgaard Welen (2007-12-26)
138 # The last hurdle of Argentina DST is over, the proposal was approved in
139 # the lower chamber too (Diputados) with a vote 192 for and 2 against.
140 # By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to
141 # the original scanned proposal, where the dates and the zero hours are
142 # clear and unambiguous...This is the article about final approval:
143 # http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996
144 #
145 # From Paul Eggert (2007-12-22):
146 # For dates after mid-2008, the following rules are my guesses and
147 # are quite possibly wrong, but are more likely than no DST at all.
148
149 # From Alexander Krivenyshev (2008-09-05):
150 # As per message from Carlos Alberto Fonseca Arauz (Nicaragua),
151 # Argentina will start DST on Sunday October 19, 2008.
152 #
153 # http://www.worldtimezone.com/dst_news/dst_news_argentina03.html
154 # http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)
155
156 # From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07)
157 # via Rodrigo Severo:
158 # Argentinian law No. 25.155 is no longer valid.
159 # http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm
160 # The new one is law No. 26.350
161 # http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm
162 # So there is no summer time in Argentina for now.
163
164 # From Mariano Absatz (2008-10-20):
165 # Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST
166 # in Argentina from 2008-10-19 until 2009-03-15.
167 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01
168 #
169
170 # Decree 1705/2008 excepting 12 Provinces from applying DST in the summer
171 # 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La
172 # Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego
173 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
174 #
175 # Press release 235 dated Saturday October 18th, from the Government of the
176 # Province of Jujuy saying it will not apply DST either (even when it was not
177 # included in Decree 1705/2008).
178 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
179
180 # From fullinet (2009-10-18):
181 # As announced in
182 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
183 # (an official .gob.ar) under title: "Sin Cambio de Hora"
184 # (English: "No hour change").
185 #
186 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
187 # oficial, decisión que estaba en estudio para su implementación el
188 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
189 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
190 # la modificación del huso horario, ya que 2009 nos encuentra con
191 # crecimiento en la producción y distribución energética."
192
193 Rule Arg 2007 only - Dec 30 0:00 1:00 S
194 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
195 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 S
196
197 # From Mariano Absatz (2004-05-21):
198 # Today it was officially published that the Province of Mendoza is changing
199 # its timezone this winter... starting tomorrow night....
200 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
201 # From Paul Eggert (2004-05-24):
202 # It's Law No. 7,210. This change is due to a public power emergency, so for
203 # now we'll assume it's for this year only.
204 #
205 # From Paul Eggert (2014-08-09):
206 # Hora de verano para la República Argentina
207 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
208 # says that standard time in Argentina from 1894-10-31
209 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
210 # over Shanks & Pottenger.
211 #
212 # From Mariano Absatz (2004-06-05):
213 # These media articles from a major newspaper mostly cover the current state:
214 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
215 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
216 #
217 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
218 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
219 # Apparently, all nine provinces would go back to UTC-03:00 at the same
220 # time in October 17th.
221 #
222 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
223 # Tierra del Fuego, Tucumán.
224 #
225 # From Mariano Absatz (2004-06-14):
226 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
227 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
228 # annoyance with the change is much higher than the power savings obtained....
229 #
230 # From Gwillim Law (2004-06-14):
231 # http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
232 # "The time change in Tierra del Fuego was a conflicted decision from
233 # the start. The government had decreed that the measure would take
234 # effect on June 1, but a normative error forced the new time to begin
235 # three days earlier, from a Saturday to a Sunday....
236 # Our understanding was that the change was originally scheduled to take place
237 # on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
238 # provinces). Sunday was May 30, only two days earlier. So the article
239 # contains a contradiction. I would give more credence to the Saturday/Sunday
240 # date than the "three days earlier" phrase, and conclude that Tierra del
241 # Fuego set its clocks back at 2004-05-30 00:00.
242 #
243 # From Steffen Thorsen (2004-10-05):
244 # The previous law 7210 which changed the province of Mendoza's time zone
245 # back in May have been modified slightly in a new law 7277, which set the
246 # new end date to 2004-09-26 (original date was 2004-10-17).
247 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
248 #
249 # From Mariano Absatz (2004-10-05):
250 # San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
251 # Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
252 # at midnight between Saturday, July 24th and Sunday, July 25th....
253 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html
254 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html
255 # http://www.sanjuan.gov.ar/prensa/archivo/000441.html
256
257 # From Alex Krivenyshev (2008-01-17):
258 # Here are articles that Argentina Province San Luis is planning to end DST
259 # as earlier as upcoming Monday January 21, 2008 or February 2008:
260 #
261 # Provincia argentina retrasa reloj y marca diferencia con resto del país
262 # (Argentine Province delayed clock and mark difference with the rest of the
263 # country)
264 # http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel
265 #
266 # Es inminente que en San Luis atrasen una hora los relojes
267 # (It is imminent in San Luis clocks one hour delay)
268 # https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html
269 # http://www.worldtimezone.com/dst_news/dst_news_argentina02.html
270
271 # From Jesper Nørgaard Welen (2008-01-18):
272 # The page of the San Luis provincial government
273 # http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812
274 # confirms what Alex Krivenyshev has earlier sent to the tz
275 # emailing list about that San Luis plans to return to standard
276 # time much earlier than the rest of the country. It also
277 # confirms that upon request the provinces San Juan and Mendoza
278 # refused to follow San Luis in this change.
279 #
280 # The change is supposed to take place Monday the 21st at 0:00
281 # hours. As far as I understand it if this goes ahead, we need
282 # a new timezone for San Luis (although there are also documented
283 # independent changes in the southamerica file of San Luis in
284 # 1990 and 1991 which has not been confirmed).
285
286 # From Jesper Nørgaard Welen (2008-01-25):
287 # Unfortunately the below page has become defunct, about the San Luis
288 # time change. Perhaps because it now is part of a group of pages "Most
289 # important pages of 2008."
290 #
291 # You can use
292 # http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834
293 # instead it seems. Or use "Buscador" from the main page of the San Luis
294 # government, and fill in "huso" and click OK, and you will get 3 pages
295 # from which the first one is identical to the above.
296
297 # From Mariano Absatz (2008-01-28):
298 # I can confirm that the Province of San Luis (and so far only that
299 # province) decided to go back to UTC-3 effective midnight Jan 20th 2008
300 # (that is, Monday 21st at 0:00 is the time the clocks were delayed back
301 # 1 hour), and they intend to keep UTC-3 as their timezone all year round
302 # (that is, unless they change their mind any minute now).
303 #
304 # So we'll have to add yet another city to 'southamerica' (I think San
305 # Luis city is the mos populated city in the Province, so it'd be
306 # America/Argentina/San_Luis... of course I can't remember if San Luis's
307 # history of particular changes goes along with Mendoza or San Juan :-(
308 # (I only remember not being able to collect hard facts about San Luis
309 # back in 2004, when these provinces changed to UTC-4 for a few days, I
310 # mailed them personally and never got an answer).
311
312 # From Paul Eggert (2014-08-12):
313 # Unless otherwise specified, data entries are from Shanks & Pottenger through
314 # 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that
315 # America/Cordoba split into 6 subregions during 1991/1992, one of which
316 # was America/San_Luis, but we haven't verified this yet so for now we'll
317 # keep America/Cordoba a single region rather than splitting it into the
318 # other 5 subregions.
319
320 # From Mariano Absatz (2009-03-13):
321 # Yesterday (with our usual 2-day notice) the Province of San Luis
322 # decided that next Sunday instead of "staying" @utc-03:00 they will go
323 # to utc-04:00 until the second Saturday in October...
324 #
325 # The press release is at
326 # http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
327 # (I couldn't find the decree, but www.sanluis.gov.ar
328 # is the official page for the Province Government.)
329 #
330 # There's also a note in only one of the major national papers ...
331 # http://www.lanacion.com.ar/nota.asp?nota_id=1107912
332 #
333 # The press release says [quick and dirty translation]:
334 # ... announced that next Sunday, at 00:00, Puntanos (the San Luis
335 # inhabitants) will have to turn back one hour their clocks
336 #
337 # Since then, San Luis will establish its own Province timezone. Thus,
338 # during 2009, this timezone change will run from 00:00 the third Sunday
339 # in March until 24:00 of the second Saturday in October.
340
341 # From Mariano Absatz (2009-10-16):
342 # ...the Province of San Luis is a case in itself.
343 #
344 # The Law at
345 # http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276
346 # is ambiguous because establishes a calendar from the 2nd Sunday in
347 # October at 0:00 thru the 2nd Saturday in March at 24:00 and the
348 # complement of that starting on the 2nd Sunday of March at 0:00 and
349 # ending on the 2nd Saturday of March at 24:00.
350 #
351 # This clearly breaks every time the 1st of March or October is a Sunday.
352 #
353 # IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd
354 # Sunday of October and March.
355 #
356 # The problem is that the changes in the rest of the Provinces that did
357 # change in 2007/2008, were made according to the Federal Law and Decrees
358 # that did so on the 3rd Sunday of October and March.
359 #
360 # In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday
361 # (October 11th) at 0:00.
362 #
363 # So I guess a new set of rules, besides "Arg", must be made and the last
364 # America/Argentina/San_Luis entries should change to use these...
365 # ...
366
367 # From Alexander Krivenyshev (2010-04-09):
368 # According to news reports from El Diario de la República Province San
369 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
370 # after April 11, 2010 - will continue to have same time as rest of
371 # Argentina (UTC-3) (no DST).
372 #
373 # Confirmaron la prórroga del huso horario de verano (Spanish)
374 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
375 # or (some English translation):
376 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
377
378 # From Mariano Absatz (2010-04-12):
379 # yes...I can confirm this...and given that San Luis keeps calling
380 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
381 # rules...San Luis is still using "Western ARgentina Time" and it got
382 # stuck on Summer daylight savings time even though the summer is over.
383
384 # From Paul Eggert (2013-09-05):
385 # Perhaps San Luis operates on the legal fiction that it is at -04
386 # with perpetual summer time, but ordinary usage typically seems to
387 # just say it's at -03; see, for example,
388 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
389 # We've documented similar situations as being plain changes to
390 # standard time, so let's do that here too. This does not change UTC
391 # offsets, only tm_isdst and the time zone abbreviations. One minor
392 # plus is that this silences a zic complaint that there's no POSIX TZ
393 # setting for time stamps past 2038.
394
395 # From Paul Eggert (2013-02-21):
396 # Milne says Córdoba time was -4:16:48.2. Round to the nearest second.
397
398 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
399 #
400 # Buenos Aires (BA), Capital Federal (CF),
401 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
402 -4:16:48 - CMT 1920 May # Córdoba Mean Time
403 -4:00 - -04 1930 Dec
404 -4:00 Arg -04/-03 1969 Oct 5
405 -3:00 Arg -03/-02 1999 Oct 3
406 -4:00 Arg -04/-03 2000 Mar 3
407 -3:00 Arg -03/-02
408 #
409 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
410 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
411 #
412 # Shanks & Pottenger also make the following claims, which we haven't verified:
413 # - Formosa switched to -3:00 on 1991-01-07.
414 # - Misiones switched to -3:00 on 1990-12-29.
415 # - Chaco switched to -3:00 on 1991-01-04.
416 # - Santiago del Estero switched to -4:00 on 1991-04-01,
417 # then to -3:00 on 1991-04-26.
418 #
419 Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31
420 -4:16:48 - CMT 1920 May
421 -4:00 - -04 1930 Dec
422 -4:00 Arg -04/-03 1969 Oct 5
423 -3:00 Arg -03/-02 1991 Mar 3
424 -4:00 - -04 1991 Oct 20
425 -3:00 Arg -03/-02 1999 Oct 3
426 -4:00 Arg -04/-03 2000 Mar 3
427 -3:00 Arg -03/-02
428 #
429 # Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN)
430 Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31
431 -4:16:48 - CMT 1920 May
432 -4:00 - -04 1930 Dec
433 -4:00 Arg -04/-03 1969 Oct 5
434 -3:00 Arg -03/-02 1991 Mar 3
435 -4:00 - -04 1991 Oct 20
436 -3:00 Arg -03/-02 1999 Oct 3
437 -4:00 Arg -04/-03 2000 Mar 3
438 -3:00 Arg -03/-02 2008 Oct 18
439 -3:00 - -03
440 #
441 # Tucumán (TM)
442 Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
443 -4:16:48 - CMT 1920 May
444 -4:00 - -04 1930 Dec
445 -4:00 Arg -04/-03 1969 Oct 5
446 -3:00 Arg -03/-02 1991 Mar 3
447 -4:00 - -04 1991 Oct 20
448 -3:00 Arg -03/-02 1999 Oct 3
449 -4:00 Arg -04/-03 2000 Mar 3
450 -3:00 - -03 2004 Jun 1
451 -4:00 - -04 2004 Jun 13
452 -3:00 Arg -03/-02
453 #
454 # La Rioja (LR)
455 Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
456 -4:16:48 - CMT 1920 May
457 -4:00 - -04 1930 Dec
458 -4:00 Arg -04/-03 1969 Oct 5
459 -3:00 Arg -03/-02 1991 Mar 1
460 -4:00 - -04 1991 May 7
461 -3:00 Arg -03/-02 1999 Oct 3
462 -4:00 Arg -04/-03 2000 Mar 3
463 -3:00 - -03 2004 Jun 1
464 -4:00 - -04 2004 Jun 20
465 -3:00 Arg -03/-02 2008 Oct 18
466 -3:00 - -03
467 #
468 # San Juan (SJ)
469 Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
470 -4:16:48 - CMT 1920 May
471 -4:00 - -04 1930 Dec
472 -4:00 Arg -04/-03 1969 Oct 5
473 -3:00 Arg -03/-02 1991 Mar 1
474 -4:00 - -04 1991 May 7
475 -3:00 Arg -03/-02 1999 Oct 3
476 -4:00 Arg -04/-03 2000 Mar 3
477 -3:00 - -03 2004 May 31
478 -4:00 - -04 2004 Jul 25
479 -3:00 Arg -03/-02 2008 Oct 18
480 -3:00 - -03
481 #
482 # Jujuy (JY)
483 Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
484 -4:16:48 - CMT 1920 May
485 -4:00 - -04 1930 Dec
486 -4:00 Arg -04/-03 1969 Oct 5
487 -3:00 Arg -03/-02 1990 Mar 4
488 -4:00 - -04 1990 Oct 28
489 -4:00 1:00 -03 1991 Mar 17
490 -4:00 - -04 1991 Oct 6
491 -3:00 1:00 -02 1992
492 -3:00 Arg -03/-02 1999 Oct 3
493 -4:00 Arg -04/-03 2000 Mar 3
494 -3:00 Arg -03/-02 2008 Oct 18
495 -3:00 - -03
496 #
497 # Catamarca (CT), Chubut (CH)
498 Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
499 -4:16:48 - CMT 1920 May
500 -4:00 - -04 1930 Dec
501 -4:00 Arg -04/-03 1969 Oct 5
502 -3:00 Arg -03/-02 1991 Mar 3
503 -4:00 - -04 1991 Oct 20
504 -3:00 Arg -03/-02 1999 Oct 3
505 -4:00 Arg -04/-03 2000 Mar 3
506 -3:00 - -03 2004 Jun 1
507 -4:00 - -04 2004 Jun 20
508 -3:00 Arg -03/-02 2008 Oct 18
509 -3:00 - -03
510 #
511 # Mendoza (MZ)
512 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
513 -4:16:48 - CMT 1920 May
514 -4:00 - -04 1930 Dec
515 -4:00 Arg -04/-03 1969 Oct 5
516 -3:00 Arg -03/-02 1990 Mar 4
517 -4:00 - -04 1990 Oct 15
518 -4:00 1:00 -03 1991 Mar 1
519 -4:00 - -04 1991 Oct 15
520 -4:00 1:00 -03 1992 Mar 1
521 -4:00 - -04 1992 Oct 18
522 -3:00 Arg -03/-02 1999 Oct 3
523 -4:00 Arg -04/-03 2000 Mar 3
524 -3:00 - -03 2004 May 23
525 -4:00 - -04 2004 Sep 26
526 -3:00 Arg -03/-02 2008 Oct 18
527 -3:00 - -03
528 #
529 # San Luis (SL)
530
531 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
532 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 S
533
534 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
535 -4:16:48 - CMT 1920 May
536 -4:00 - -04 1930 Dec
537 -4:00 Arg -04/-03 1969 Oct 5
538 -3:00 Arg -03/-02 1990
539 -3:00 1:00 -02 1990 Mar 14
540 -4:00 - -04 1990 Oct 15
541 -4:00 1:00 -03 1991 Mar 1
542 -4:00 - -04 1991 Jun 1
543 -3:00 - -03 1999 Oct 3
544 -4:00 1:00 -03 2000 Mar 3
545 -3:00 - -03 2004 May 31
546 -4:00 - -04 2004 Jul 25
547 -3:00 Arg -03/-02 2008 Jan 21
548 -4:00 SanLuis -04/-03 2009 Oct 11
549 -3:00 - -03
550 #
551 # Santa Cruz (SC)
552 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
553 -4:16:48 - CMT 1920 May
554 -4:00 - -04 1930 Dec
555 -4:00 Arg -04/-03 1969 Oct 5
556 -3:00 Arg -03/-02 1999 Oct 3
557 -4:00 Arg -04/-03 2000 Mar 3
558 -3:00 - -03 2004 Jun 1
559 -4:00 - -04 2004 Jun 20
560 -3:00 Arg -03/-02 2008 Oct 18
561 -3:00 - -03
562 #
563 # Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF)
564 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
565 -4:16:48 - CMT 1920 May
566 -4:00 - -04 1930 Dec
567 -4:00 Arg -04/-03 1969 Oct 5
568 -3:00 Arg -03/-02 1999 Oct 3
569 -4:00 Arg -04/-03 2000 Mar 3
570 -3:00 - -03 2004 May 30
571 -4:00 - -04 2004 Jun 20
572 -3:00 Arg -03/-02 2008 Oct 18
573 -3:00 - -03
574
575 # Aruba
576 Link America/Curacao America/Aruba
577
578 # Bolivia
579 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
580 Zone America/La_Paz -4:32:36 - LMT 1890
581 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
582 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST
583 -4:00 - -04
584
585 # Brazil
586
587 # From Paul Eggert (1993-11-18):
588 # The mayor of Rio recently attempted to change the time zone rules
589 # just in his city, in order to leave more summer time for the tourist trade.
590 # The rule change lasted only part of the day;
591 # the federal government refused to follow the city's rules, and business
592 # was in a chaos, so the mayor backed down that afternoon.
593
594 # From IATA SSIM (1996-02):
595 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
596 # Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ),
597 # Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO),
598 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
599 # [The last three states are new to this issue of the IATA SSIM.]
600
601 # From Gwillim Law (1996-10-07):
602 # Geography, history (Tocantins was part of Goiás until 1989), and other
603 # sources of time zone information lead me to believe that AL, SE, and TO were
604 # always in BR1, and so the only change was whether or not they observed DST....
605 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
606 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
607 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
608 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
609 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
610 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
611 # become part of the state of Pernambuco). The boundary between BR1 and BR2
612 # has never been clearly stated. They've simply been called East and West.
613 # However, some conclusions can be drawn from another IATA manual: the Airline
614 # Coding Directory, which lists close to 400 airports in Brazil. For each
615 # airport it gives a time zone which is coded to the SSIM. From that
616 # information, I'm led to conclude that the states of Amapá (AP), Ceará (CE),
617 # Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do
618 # Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST.
619
620 # From Marcos Tadeu (1998-09-27):
621 # Brazilian official page <http://pcdsh01.on.br/verao1.html>
622
623 # From Jesper Nørgaard (2000-11-03):
624 # [For an official list of which regions in Brazil use which time zones, see:]
625 # http://pcdsh01.on.br/Fusbr.htm
626 # http://pcdsh01.on.br/Fusbrhv.htm
627
628 # From Celso Doria via David Madeo (2002-10-09):
629 # The reason for the delay this year has to do with elections in Brazil.
630 #
631 # Unlike in the United States, elections in Brazil are 100% computerized and
632 # the results are known almost immediately. Yesterday, it was the first
633 # round of the elections when 115 million Brazilians voted for President,
634 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is
635 # counting (or re-counting) votes anymore and we know there will be a second
636 # round for the Presidency and also for some Governors. The 2nd round will
637 # take place on October 27th.
638 #
639 # The reason why the DST will only begin November 3rd is that the thousands
640 # of electoral machines used cannot have their time changed, and since the
641 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
642 # the Government decided to postpone DST, instead of changing the Constitution
643 # (maybe, for the next elections, it will be possible to change the clock)...
644
645 # From Rodrigo Severo (2004-10-04):
646 # It's just the biannual change made necessary by the much hyped, supposedly
647 # modern Brazilian eletronic voting machines which, apparently, can't deal
648 # with a time change between the first and the second rounds of the elections.
649
650 # From Steffen Thorsen (2007-09-20):
651 # Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00:
652 # http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975
653
654 # From Paul Schulze (2008-06-24):
655 # ...by law number 11.662 of April 24, 2008 (published in the "Diario
656 # Oficial da União"...) in Brazil there are changes in the timezones,
657 # effective today (00:00am at June 24, 2008) as follows:
658 #
659 # a) The timezone UTC+5 is extinguished, with all the Acre state and the
660 # part of the Amazonas state that had this timezone now being put to the
661 # timezone UTC+4
662 # b) The whole Pará state now is put at timezone UTC+3, instead of just
663 # part of it, as was before.
664 #
665 # This change follows a proposal of senator Tiao Viana of Acre state, that
666 # proposed it due to concerns about open television channels displaying
667 # programs inappropriate to youths in the states that had the timezone
668 # UTC+5 too early in the night. In the occasion, some more corrections
669 # were proposed, trying to unify the timezones of any given state. This
670 # change modifies timezone rules defined in decree 2.784 of 18 June,
671 # 1913.
672
673 # From Rodrigo Severo (2008-06-24):
674 # Just correcting the URL:
675 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008
676 #
677 # As a result of the above Decree I believe the America/Rio_Branco
678 # timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall
679 # be created to represent the...west side of the Pará State. I
680 # suggest this new timezone be called Santarem as the most
681 # important/populated city in the affected area.
682 #
683 # This new timezone would be the same as the Rio_Branco timezone up to
684 # the 2008/06/24 change which would be to UTC-3 instead of UTC-4.
685
686 # From Alex Krivenyshev (2008-06-24):
687 # This is a quick reference page for New and Old Brazil Time Zones map.
688 # http://www.worldtimezone.com/brazil-time-new-old.php
689 #
690 # - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05
691 # (state Acre and the part of the Amazonas will be UTC/GMT-04) - western
692 # part of Par state is moving to one timezone UTC-03 (from UTC-04).
693
694 # From Paul Eggert (2002-10-10):
695 # The official decrees referenced below are mostly taken from
696 # Decretos sobre o Horário de Verão no Brasil.
697 # http://pcdsh01.on.br/DecHV.html
698
699 # From Steffen Thorsen (2008-08-29):
700 # As announced by the government and many newspapers in Brazil late
701 # yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and
702 # it will end on 2009-02-15 (current rule for Brazil is fine). Based on
703 # past years experience with the elections, there was a good chance that
704 # the start was postponed to November, but it did not happen this year.
705 #
706 # It has not yet been posted to http://pcdsh01.on.br/DecHV.html
707 #
708 # An official page about it:
709 # http://www.mme.gov.br/site/news/detail.do?newsId=16722
710 # Note that this link does not always work directly, but must be accessed
711 # by going to
712 # http://www.mme.gov.br/first
713 #
714 # One example link that works directly:
715 # http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54
716 # (Portuguese)
717 #
718 # We have a written a short article about it as well:
719 # https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html
720 #
721 # From Alexander Krivenyshev (2011-10-04):
722 # State Bahia will return to Daylight savings time this year after 8 years off.
723 # The announcement was made by Governor Jaques Wagner in an interview to a
724 # television station in Salvador.
725
726 # In Portuguese:
727 # http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html
728 # https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html
729
730 # From Guilherme Bernardes Rodrigues (2011-10-07):
731 # There is news in the media, however there is still no decree about it.
732 # I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the
733 # official agency about time in Brazil, and she confirmed that the old rule is
734 # still in force.
735
736 # From Guilherme Bernardes Rodrigues (2011-10-14)
737 # It's official, the President signed a decree that includes Bahia in summer
738 # time.
739 # [ and in a second message (same day): ]
740 # I found the decree.
741 #
742 # DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011
743 # Link :
744 # http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6
745
746 # From Kelley Cook (2012-10-16):
747 # The governor of state of Bahia in Brazil announced on Thursday that
748 # due to public pressure, he is reversing the DST policy they implemented
749 # last year and will not be going to Summer Time on October 21st....
750 # http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia
751
752 # From Rodrigo Severo (2012-10-16):
753 # Tocantins state will have DST.
754 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
755
756 # From Steffen Thorsen (2013-09-20):
757 # Tocantins in Brazil is very likely not to observe DST from October....
758 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
759 # We will keep this article updated when this is confirmed:
760 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
761
762 # From Steffen Thorsen (2013-10-17):
763 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
764 # Senator Jorge Viana announced that Acre will change time zone on November 10.
765 # He did not specify the time of the change, nor if western parts of Amazonas
766 # will change as well.
767 #
768 # From Paul Eggert (2013-10-17):
769 # For now, assume western Amazonas will change as well.
770
771 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
772 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
773 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
774 Rule Brazil 1931 only - Oct 3 11:00 1:00 S
775 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
776 Rule Brazil 1932 only - Oct 3 0:00 1:00 S
777 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
778 # revoked DST.
779 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
780 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
781 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
782 Rule Brazil 1950 only - Apr 16 1:00 0 -
783 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
784 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
785 Rule Brazil 1953 only - Mar 1 0:00 0 -
786 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
787 # revoked DST.
788 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
789 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
790 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
791 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
792 # extended the above decree to all of the national territory on 12-09.
793 Rule Brazil 1963 only - Dec 9 0:00 1:00 S
794 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
795 # extended summer time by one day to 1964-03-01 00:00 (start of school).
796 Rule Brazil 1964 only - Mar 1 0:00 0 -
797 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
798 Rule Brazil 1965 only - Jan 31 0:00 1:00 S
799 Rule Brazil 1965 only - Mar 31 0:00 0 -
800 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
801 Rule Brazil 1965 only - Dec 1 0:00 1:00 S
802 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
803 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
804 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
805 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
806 # revoked DST.
807 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
808 Rule Brazil 1985 only - Nov 2 0:00 1:00 S
809 # Decree 92,310 (1986-01-21)
810 # Decree 92,463 (1986-03-13)
811 Rule Brazil 1986 only - Mar 15 0:00 0 -
812 # Decree 93,316 (1986-10-01)
813 Rule Brazil 1986 only - Oct 25 0:00 1:00 S
814 Rule Brazil 1987 only - Feb 14 0:00 0 -
815 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
816 Rule Brazil 1987 only - Oct 25 0:00 1:00 S
817 Rule Brazil 1988 only - Feb 7 0:00 0 -
818 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
819 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
820 Rule Brazil 1988 only - Oct 16 0:00 1:00 S
821 Rule Brazil 1989 only - Jan 29 0:00 0 -
822 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
823 # with the same exceptions
824 Rule Brazil 1989 only - Oct 15 0:00 1:00 S
825 Rule Brazil 1990 only - Feb 11 0:00 0 -
826 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
827 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
828 # Decree 99,629 (1990-10-19) adds BA, MT.
829 Rule Brazil 1990 only - Oct 21 0:00 1:00 S
830 Rule Brazil 1991 only - Feb 17 0:00 0 -
831 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
832 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
833 Rule Brazil 1991 only - Oct 20 0:00 1:00 S
834 Rule Brazil 1992 only - Feb 9 0:00 0 -
835 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
836 # adopted by same states.
837 Rule Brazil 1992 only - Oct 25 0:00 1:00 S
838 Rule Brazil 1993 only - Jan 31 0:00 0 -
839 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
840 # adopted by same states, plus AM.
841 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
842 # web page corrected 2004-01-07) adopted by same states, minus AM.
843 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
844 # adopted by same states, plus MT and TO.
845 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
846 # adds AL, SE.
847 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
848 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
849 Rule Brazil 1996 only - Feb 11 0:00 0 -
850 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
851 # adopted by same states, minus AL, SE.
852 Rule Brazil 1996 only - Oct 6 0:00 1:00 S
853 Rule Brazil 1997 only - Feb 16 0:00 0 -
854 # From Daniel C. Sobral (1998-02-12):
855 # In 1997, the DS began on October 6. The stated reason was that
856 # because international television networks ignored Brazil's policy on DS,
857 # they bought the wrong times on satellite for coverage of Pope's visit.
858 # This year, the ending date of DS was postponed to March 1
859 # to help dealing with the shortages of electric power.
860 #
861 # Decree 2,317 (1997-09-04), adopted by same states.
862 Rule Brazil 1997 only - Oct 6 0:00 1:00 S
863 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
864 # (1998-02-10)
865 Rule Brazil 1998 only - Mar 1 0:00 0 -
866 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
867 # adopted by the same states as before.
868 Rule Brazil 1998 only - Oct 11 0:00 1:00 S
869 Rule Brazil 1999 only - Feb 21 0:00 0 -
870 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
871 # (1999-08-23) adopted by same states.
872 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
873 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
874 Rule Brazil 1999 only - Oct 3 0:00 1:00 S
875 Rule Brazil 2000 only - Feb 27 0:00 0 -
876 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
877 # adopted by the same states as before.
878 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
879 # repeals DST in PE and RR, effective 2000-10-15 00:00.
880 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
881 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
882 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
883 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
884 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
885 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
886 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
887 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
888 Rule Brazil 2002 only - Nov 3 0:00 1:00 S
889 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
890 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
891 Rule Brazil 2003 only - Oct 19 0:00 1:00 S
892 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
893 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
894 Rule Brazil 2004 only - Nov 2 0:00 1:00 S
895 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
896 # adopted by the same states as before.
897 Rule Brazil 2005 only - Oct 16 0:00 1:00 S
898 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
899 # adopted by the same states as before.
900 Rule Brazil 2006 only - Nov 5 0:00 1:00 S
901 Rule Brazil 2007 only - Feb 25 0:00 0 -
902 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
903 # adopted by the same states as before.
904 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
905 # From Frederico A. C. Neves (2008-09-10):
906 # According to this decree
907 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
908 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
909 # 3rd Feb Sunday. There is an exception on the return date when this is
910 # the Carnival Sunday then the return date will be the next Sunday...
911 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 S
912 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
913 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
914 # added Bahia.
915 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
916 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
917 # removed Bahia and added Tocantins.
918 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
919 # removed Tocantins.
920 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
921 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
922 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
923 # From Steffen Thorsen (2017-12-18):
924 # According to many media sources, next year's DST start in Brazil will move to
925 # the first Sunday of November, and it will stay like that for the years after.
926 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
927 # From Steffen Thorsen (2017-12-20):
928 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
929 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 S
930 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
931 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
932 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
933 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
934 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
935 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
936 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
937 # From Arthur David Olson (2008-09-29):
938 # The next is wrong in some years but is better than nothing.
939 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
940
941 # The latest ruleset listed above says that the following states observe DST:
942 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
943
944 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
945 #
946 # Fernando de Noronha (administratively part of PE)
947 Zone America/Noronha -2:09:40 - LMT 1914
948 -2:00 Brazil -02/-01 1990 Sep 17
949 -2:00 - -02 1999 Sep 30
950 -2:00 Brazil -02/-01 2000 Oct 15
951 -2:00 - -02 2001 Sep 13
952 -2:00 Brazil -02/-01 2002 Oct 1
953 -2:00 - -02
954 # Other Atlantic islands have no permanent settlement.
955 # These include Trindade and Martim Vaz (administratively part of ES),
956 # Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE).
957 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
958 # it also included the Penedos.
959 #
960 # Amapá (AP), east Pará (PA)
961 # East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu.
962 # The division between east and west Pará is the river Xingu.
963 # In the north a very small part from the river Javary (now Jari I guess,
964 # the border with Amapá) to the Amazon, then to the Xingu.
965 Zone America/Belem -3:13:56 - LMT 1914
966 -3:00 Brazil -03/-02 1988 Sep 12
967 -3:00 - -03
968 #
969 # west Pará (PA)
970 # West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém.
971 Zone America/Santarem -3:38:48 - LMT 1914
972 -4:00 Brazil -04/-03 1988 Sep 12
973 -4:00 - -04 2008 Jun 24 0:00
974 -3:00 - -03
975 #
976 # Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN),
977 # Paraíba (PB)
978 Zone America/Fortaleza -2:34:00 - LMT 1914
979 -3:00 Brazil -03/-02 1990 Sep 17
980 -3:00 - -03 1999 Sep 30
981 -3:00 Brazil -03/-02 2000 Oct 22
982 -3:00 - -03 2001 Sep 13
983 -3:00 Brazil -03/-02 2002 Oct 1
984 -3:00 - -03
985 #
986 # Pernambuco (PE) (except Atlantic islands)
987 Zone America/Recife -2:19:36 - LMT 1914
988 -3:00 Brazil -03/-02 1990 Sep 17
989 -3:00 - -03 1999 Sep 30
990 -3:00 Brazil -03/-02 2000 Oct 15
991 -3:00 - -03 2001 Sep 13
992 -3:00 Brazil -03/-02 2002 Oct 1
993 -3:00 - -03
994 #
995 # Tocantins (TO)
996 Zone America/Araguaina -3:12:48 - LMT 1914
997 -3:00 Brazil -03/-02 1990 Sep 17
998 -3:00 - -03 1995 Sep 14
999 -3:00 Brazil -03/-02 2003 Sep 24
1000 -3:00 - -03 2012 Oct 21
1001 -3:00 Brazil -03/-02 2013 Sep
1002 -3:00 - -03
1003 #
1004 # Alagoas (AL), Sergipe (SE)
1005 Zone America/Maceio -2:22:52 - LMT 1914
1006 -3:00 Brazil -03/-02 1990 Sep 17
1007 -3:00 - -03 1995 Oct 13
1008 -3:00 Brazil -03/-02 1996 Sep 4
1009 -3:00 - -03 1999 Sep 30
1010 -3:00 Brazil -03/-02 2000 Oct 22
1011 -3:00 - -03 2001 Sep 13
1012 -3:00 Brazil -03/-02 2002 Oct 1
1013 -3:00 - -03
1014 #
1015 # Bahia (BA)
1016 # There are too many Salvadors elsewhere, so use America/Bahia instead
1017 # of America/Salvador.
1018 Zone America/Bahia -2:34:04 - LMT 1914
1019 -3:00 Brazil -03/-02 2003 Sep 24
1020 -3:00 - -03 2011 Oct 16
1021 -3:00 Brazil -03/-02 2012 Oct 21
1022 -3:00 - -03
1023 #
1024 # Goiás (GO), Distrito Federal (DF), Minas Gerais (MG),
1025 # Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR),
1026 # Santa Catarina (SC), Rio Grande do Sul (RS)
1027 Zone America/Sao_Paulo -3:06:28 - LMT 1914
1028 -3:00 Brazil -03/-02 1963 Oct 23 0:00
1029 -3:00 1:00 -02 1964
1030 -3:00 Brazil -03/-02
1031 #
1032 # Mato Grosso do Sul (MS)
1033 Zone America/Campo_Grande -3:38:28 - LMT 1914
1034 -4:00 Brazil -04/-03
1035 #
1036 # Mato Grosso (MT)
1037 Zone America/Cuiaba -3:44:20 - LMT 1914
1038 -4:00 Brazil -04/-03 2003 Sep 24
1039 -4:00 - -04 2004 Oct 1
1040 -4:00 Brazil -04/-03
1041 #
1042 # Rondônia (RO)
1043 Zone America/Porto_Velho -4:15:36 - LMT 1914
1044 -4:00 Brazil -04/-03 1988 Sep 12
1045 -4:00 - -04
1046 #
1047 # Roraima (RR)
1048 Zone America/Boa_Vista -4:02:40 - LMT 1914
1049 -4:00 Brazil -04/-03 1988 Sep 12
1050 -4:00 - -04 1999 Sep 30
1051 -4:00 Brazil -04/-03 2000 Oct 15
1052 -4:00 - -04
1053 #
1054 # east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto
1055 # The great circle line from Tabatinga to Porto Acre divides
1056 # east from west Amazonas.
1057 Zone America/Manaus -4:00:04 - LMT 1914
1058 -4:00 Brazil -04/-03 1988 Sep 12
1059 -4:00 - -04 1993 Sep 28
1060 -4:00 Brazil -04/-03 1994 Sep 22
1061 -4:00 - -04
1062 #
1063 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
1064 # Eirunepé, Envira, Ipixuna
1065 Zone America/Eirunepe -4:39:28 - LMT 1914
1066 -5:00 Brazil -05/-04 1988 Sep 12
1067 -5:00 - -05 1993 Sep 28
1068 -5:00 Brazil -05/-04 1994 Sep 22
1069 -5:00 - -05 2008 Jun 24 0:00
1070 -4:00 - -04 2013 Nov 10
1071 -5:00 - -05
1072 #
1073 # Acre (AC)
1074 Zone America/Rio_Branco -4:31:12 - LMT 1914
1075 -5:00 Brazil -05/-04 1988 Sep 12
1076 -5:00 - -05 2008 Jun 24 0:00
1077 -4:00 - -04 2013 Nov 10
1078 -5:00 - -05
1079
1080 # Chile
1081
1082 # From Paul Eggert (2015-04-03):
1083 # Shanks & Pottenger says America/Santiago introduced standard time in
1084 # 1890 and rounds its UT offset to 70W40; guess that in practice this
1085 # was the same offset as in 1916-1919. It also says Pacific/Easter
1086 # standardized on 109W22 in 1890; assume this didn't change the clocks.
1087 #
1088 # Dates for America/Santiago from 1910 to 2004 are primarily from
1089 # the following source, cited by Oscar van Vlijmen (2006-10-08):
1090 # [1] Chile Law
1091 # http://www.webexhibits.org/daylightsaving/chile.html
1092 # This contains a copy of this official table:
1093 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
1094 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
1095 # [1] needs several corrections, though.
1096 #
1097 # The first set of corrections is from:
1098 # [2] History of the Official Time of Chile
1099 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
1100 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
1101 # This is an English translation of:
1102 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
1103 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
1104 # A fancier Spanish version (requiring mouse-clicking) is at:
1105 # http://www.horaoficial.cl/historia_hora.html
1106 # Conflicts between [1] and [2] were resolved as follows:
1107 #
1108 # - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites
1109 # Boletín No. 1, Aviso No. 1 (1910). Go with [2].
1110 #
1111 # - [1] says SMT was -4:42:45, [2] says Chile's official time from
1112 # 1916 to 1919 was -4:42:46.3, the meridian of Chile's National
1113 # Astronomical Observatory (OAN), then located in what is now
1114 # Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46.
1115 #
1116 # - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites
1117 # Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2].
1118 #
1119 # - [1] does not give times for transitions; assume they occur
1120 # at midnight mainland time, the current common practice. However,
1121 # go with [2]'s specification of 23:00 for the 1947-05-21 transition.
1122 #
1123 # Another correction to [1] is from Jesper Nørgaard Welen, who
1124 # wrote (2006-10-08), "I think that there are some obvious mistakes in
1125 # the suggested link from Oscar van Vlijmen,... for instance entry 66
1126 # says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at
1127 # 1990-09-15 (they should have been 1990-09-15 and 1990-09-16
1128 # respectively), but anyhow it clears up some doubts too."
1129 #
1130 # Data for Pacific/Easter from 1910 through 1967 come from Shanks &
1131 # Pottenger. After that, for lack of better info assume
1132 # Pacific/Easter is always two hours behind America/Santiago;
1133 # this is known to work for DST transitions starting in 2008 and
1134 # may well be true for earlier transitions.
1135
1136 # From Eduardo Krell (1995-10-19):
1137 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
1138 # of October.... The law is the same for March and October.
1139 # (1998-09-29):
1140 # Because of the drought this year, the government decided to go into
1141 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
1142 # (unless there's another dry season next year, I guess).
1143
1144 # From Julio I. Pacheco Troncoso (1999-03-18):
1145 # Because of the same drought, the government decided to end DST later,
1146 # on April 3, (one-time change).
1147
1148 # From Germán Poo-Caamaño (2008-03-03):
1149 # Due to drought, Chile extends Daylight Time in three weeks. This
1150 # is one-time change (Saturday 3/29 at 24:00 for America/Santiago
1151 # and Saturday 3/29 at 22:00 for Pacific/Easter)
1152 # The Supreme Decree is located at
1153 # http://www.shoa.cl/servicios/supremo316.pdf
1154 #
1155 # From José Miguel Garrido (2008-03-05):
1156 # http://www.shoa.cl/noticias/2008/04hora/hora.htm
1157
1158 # From Angel Chiang (2010-03-04):
1159 # Subject: DST in Chile exceptionally extended to 3 April due to earthquake
1160 # http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098
1161 #
1162 # From Arthur David Olson (2010-03-06):
1163 # Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.
1164
1165 # From Glenn Eychaner (2011-03-28):
1166 # http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}
1167 # In English:
1168 # Chile's clocks will go back an hour this year on the 7th of May instead
1169 # of this Saturday. They will go forward again the 3rd Saturday in
1170 # August, not in October as they have since 1968.
1171
1172 # From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23):
1173 # As stated in the website of the Chilean Energy Ministry
1174 # http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html
1175 # The Chilean Government has decided to postpone the entrance into winter time
1176 # (to leave DST) from March 11 2012 to April 28th 2012....
1177 # Quote from the website communication:
1178 #
1179 # 6. For the year 2012, the dates of entry into winter time will be as follows:
1180 # a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at
1181 # 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00
1182 # of the same day.
1183 # b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is,
1184 # at 23:59:59, instead of passing to 0:00, the time should be adjusted to be
1185 # 01:00 on September 2.
1186
1187 # From Steffen Thorsen (2013-02-15):
1188 # According to several news sources, Chile has extended DST this year,
1189 # they will end DST later and start DST earlier than planned. They
1190 # hope to save energy. The new end date is 2013-04-28 00:00 and new
1191 # start date is 2013-09-08 00:00....
1192 # http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm
1193
1194 # From José Miguel Garrido (2014-02-19):
1195 # Today appeared in the Diario Oficial a decree amending the time change
1196 # dates to 2014.
1197 # DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC)
1198 # DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC)
1199 # http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf
1200
1201 # From Eduardo Romero Urra (2015-03-03):
1202 # Today has been published officially that Chile will use the DST time
1203 # permanently until March 25 of 2017
1204 # http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg
1205 #
1206 # From Paul Eggert (2015-03-03):
1207 # For now, assume that the extension will persist indefinitely.
1208
1209 # From Juan Correa (2016-03-18):
1210 # The decree regarding DST has been published in today's Official Gazette:
1211 # http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/
1212 # http://www.leychile.cl/Navegar?idNorma=1088502
1213 # It does consider the second Saturday of May and August as the dates
1214 # for the transition; and it lists DST dates until 2019, but I think
1215 # this scheme will stick.
1216 #
1217 # From Paul Eggert (2016-03-18):
1218 # For now, assume the pattern holds for the indefinite future.
1219 # The decree says transitions occur at 24:00; in practice this appears
1220 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
1221 # Island is always two hours behind the mainland.
1222
1223 # From Juan Correa (2016-12-04):
1224 # Magallanes region ... will keep DST (UTC -3) all year round....
1225 # http://www.soychile.cl/Santiago/Sociedad/2016/12/04/433428/Bachelet-firmo-el-decreto-para-establecer-un-horario-unico-para-la-Region-de-Magallanes.aspx
1226 #
1227 # From Deborah Goldsmith (2017-01-19):
1228 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
1229 # From Paul Eggert (2017-01-19):
1230 # The above says the Magallanes change expires 2019-05-11 at 24:00,
1231 # so in theory, they will revert to -04/-03 after that, which means
1232 # they will switch from -03 to -04 one hour after Santiago does that day.
1233 # For now, assume that they will not revert.
1234
1235 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1236 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
1237 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1238 Rule Chile 1968 only - Nov 3 4:00u 1:00 S
1239 Rule Chile 1969 only - Mar 30 3:00u 0 -
1240 Rule Chile 1969 only - Nov 23 4:00u 1:00 S
1241 Rule Chile 1970 only - Mar 29 3:00u 0 -
1242 Rule Chile 1971 only - Mar 14 3:00u 0 -
1243 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S
1244 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1245 Rule Chile 1973 only - Sep 30 4:00u 1:00 S
1246 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S
1247 Rule Chile 1987 only - Apr 12 3:00u 0 -
1248 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1249 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 S
1250 Rule Chile 1990 only - Sep 16 4:00u 1:00 S
1251 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1252 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S
1253 Rule Chile 1997 only - Mar 30 3:00u 0 -
1254 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1255 Rule Chile 1998 only - Sep 27 4:00u 1:00 S
1256 Rule Chile 1999 only - Apr 4 3:00u 0 -
1257 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 S
1258 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1259 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1260 # which is used below in specifying the transition.
1261 Rule Chile 2008 only - Mar 30 3:00u 0 -
1262 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1263 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1264 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1265 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 S
1266 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
1267 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 S
1268 Rule Chile 2016 max - May Sun>=9 3:00u 0 -
1269 Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 S
1270 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1271 # (1996-09) says 1998-03-08. Ignore these.
1272 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1273 Zone America/Santiago -4:42:46 - LMT 1890
1274 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1275 -5:00 - -05 1916 Jul 1
1276 -4:42:46 - SMT 1918 Sep 10
1277 -4:00 - -04 1919 Jul 1
1278 -4:42:46 - SMT 1927 Sep 1
1279 -5:00 Chile -05/-04 1932 Sep 1
1280 -4:00 - -04 1942 Jun 1
1281 -5:00 - -05 1942 Aug 1
1282 -4:00 - -04 1946 Jul 15
1283 -4:00 1:00 -03 1946 Sep 1 # central Chile
1284 -4:00 - -04 1947 Apr 1
1285 -5:00 - -05 1947 May 21 23:00
1286 -4:00 Chile -04/-03
1287 Zone America/Punta_Arenas -4:43:40 - LMT 1890
1288 -4:42:46 - SMT 1910 Jan 10
1289 -5:00 - -05 1916 Jul 1
1290 -4:42:46 - SMT 1918 Sep 10
1291 -4:00 - -04 1919 Jul 1
1292 -4:42:46 - SMT 1927 Sep 1
1293 -5:00 Chile -05/-04 1932 Sep 1
1294 -4:00 - -04 1942 Jun 1
1295 -5:00 - -05 1942 Aug 1
1296 -4:00 - -04 1947 Apr 1
1297 -5:00 - -05 1947 May 21 23:00
1298 -4:00 Chile -04/-03 2016 Dec 4
1299 -3:00 - -03
1300 Zone Pacific/Easter -7:17:28 - LMT 1890
1301 -7:17:28 - EMT 1932 Sep # Easter Mean Time
1302 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time
1303 -6:00 Chile -06/-05
1304 #
1305 # Salas y Gómez Island is uninhabited.
1306 # Other Chilean locations, including Juan Fernández Is, Desventuradas Is,
1307 # and Antarctic bases, are like America/Santiago.
1308
1309 # Antarctic base using South American rules
1310 # (See the file 'antarctica' for more.)
1311 #
1312 # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968)
1313 #
1314 # From Ethan Dicks (1996-10-06):
1315 # It keeps the same time as Punta Arenas, Chile, because, just like us
1316 # and the South Pole, that's the other end of their supply line....
1317 # I verified with someone who was there that since 1980,
1318 # Palmer has followed Chile. Prior to that, before the Falklands War,
1319 # Palmer used to be supplied from Argentina.
1320 #
1321 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1322 Zone Antarctica/Palmer 0 - -00 1965
1323 -4:00 Arg -04/-03 1969 Oct 5
1324 -3:00 Arg -03/-02 1982 May
1325 -4:00 Chile -04/-03 2016 Dec 4
1326 -3:00 - -03
1327
1328 # Colombia
1329
1330 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1331 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1332
1333 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1334 Rule CO 1992 only - May 3 0:00 1:00 S
1335 Rule CO 1993 only - Apr 4 0:00 0 -
1336 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1337 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1338 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1339 -5:00 CO -05/-04
1340 # Malpelo, Providencia, San Andres
1341 # no information; probably like America/Bogota
1342
1343 # Curaçao
1344
1345 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1346 #
1347 # From Paul Eggert (2006-03-22):
1348 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1349 # -4:00 since standard time was introduced on 1912-03-02; and that
1350 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1351 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1352 # Saba Island has been like Curaçao.
1353 # This all predates our 1970 cutoff, though.
1354 #
1355 # By July 2007 Curaçao and St Maarten are planned to become
1356 # associated states within the Netherlands, much like Aruba;
1357 # Bonaire, Saba and St Eustatius would become directly part of the
1358 # Netherlands as Kingdom Islands. This won't affect their time zones
1359 # though, as far as we know.
1360 #
1361 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1362 Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad
1363 -4:30 - -0430 1965
1364 -4:00 - AST
1365
1366 # From Arthur David Olson (2011-06-15):
1367 # use links for places with new iso3166 codes.
1368 # The name "Lower Prince's Quarter" is both longer than fourteen characters
1369 # and contains an apostrophe; use "Lower_Princes" below.
1370
1371 Link America/Curacao America/Lower_Princes # Sint Maarten
1372 Link America/Curacao America/Kralendijk # Caribbean Netherlands
1373
1374 # Ecuador
1375 #
1376 # Milne says the Central and South American Telegraph Company used -5:24:15.
1377 #
1378 # From Alois Treindl (2016-12-15):
1379 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
1380 # ... Whether the law applied also to Galápagos, I do not know.
1381 # From Paul Eggert (2016-12-15):
1382 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
1383 # This says President Sixto Durán Ballén signed decree No. 285, which
1384 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
1385 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did
1386 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
1387 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
1388 # sol" ("It was dawning in the middle of the night, the buses went to class
1389 # without sun"). Although Ballén's campaign slogan was "Ni un paso atrás"
1390 # (Not one step back), the clocks went back in 1993 and the experiment was not
1391 # repeated. For now, assume transitions were at 00:00 local time country-wide.
1392 #
1393 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1394 Rule Ecuador 1992 only - Nov 28 0:00 1:00 S
1395 Rule Ecuador 1993 only - Feb 5 0:00 0 -
1396 #
1397 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1398 Zone America/Guayaquil -5:19:20 - LMT 1890
1399 -5:14:00 - QMT 1931 # Quito Mean Time
1400 -5:00 Ecuador -05/-04
1401 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1402 -5:00 - -05 1986
1403 -6:00 Ecuador -06/-05
1404
1405 # Falklands
1406
1407 # From Paul Eggert (2006-03-22):
1408 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1409 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1410
1411 # From Falkland Islands Government Office, London (2001-01-22)
1412 # via Jesper Nørgaard:
1413 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1414 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1415 # September. It is anticipated that the clocks will revert back at 2
1416 # am on Sunday 21 April 2002 and advance to summer time at 2 am on
1417 # Sunday 1 September.
1418
1419 # From Rives McDow (2001-02-13):
1420 #
1421 # I have communicated several times with people there, and the last
1422 # time I had communications that was helpful was in 1998. Here is
1423 # what was said then:
1424 #
1425 # "The general rule was that Stanley used daylight saving and the Camp
1426 # did not. However for various reasons many people in the Camp have
1427 # started to use daylight saving (known locally as 'Stanley Time')
1428 # There is no rule as to who uses daylight saving - it is a matter of
1429 # personal choice and so it is impossible to draw a map showing who
1430 # uses it and who does not. Any list would be out of date as soon as
1431 # it was produced. This year daylight saving ended on April 18/19th
1432 # and started again on September 12/13th. I do not know what the rule
1433 # is, but can find out if you like. We do not change at the same time
1434 # as UK or Chile."
1435 #
1436 # I did have in my notes that the rule was "Second Saturday in Sep at
1437 # 0:00 until third Saturday in Apr at 0:00". I think that this does
1438 # not agree in some cases with Shanks; is this true?
1439 #
1440 # Also, there is no mention in the list that some areas in the
1441 # Falklands do not use DST. I have found in my communications there
1442 # that these areas are on the western half of East Falkland and all of
1443 # West Falkland. Stanley is the only place that consistently observes
1444 # DST. Again, as in other places in the world, the farmers don't like
1445 # it. West Falkland is almost entirely sheep farmers.
1446 #
1447 # I know one lady there that keeps a list of which farm keeps DST and
1448 # which doesn't each year. She runs a shop in Stanley, and says that
1449 # the list changes each year. She uses it to communicate to her
1450 # customers, catching them when they are home for lunch or dinner.
1451
1452 # From Paul Eggert (2001-03-05):
1453 # For now, we'll just record the time in Stanley, since we have no
1454 # better info.
1455
1456 # From Steffen Thorsen (2011-04-01):
1457 # The Falkland Islands will not turn back clocks this winter, but stay on
1458 # daylight saving time.
1459 #
1460 # One source:
1461 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3
1462 #
1463 # We have gotten this confirmed by a clerk of the legislative assembly:
1464 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1465 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1466 # hours) on the first Sunday of September at 0200hrs.
1467 #
1468 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1469 # will not revert to local mean time, but clocks will remain on Summer
1470 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1471 # change to local time following the trial period will be notified.
1472 #
1473 # From Andrew Newman (2012-02-24)
1474 # A letter from Justin McPhee, Chief Executive,
1475 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1476 # states...
1477 # The current Atlantic/Stanley entry under South America expects the
1478 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1479 # The database entry states that in 2011 Stanley was staying on fixed
1480 # summer time on a trial basis only. FIG need to contact IANA and/or
1481 # the maintainers of the database to inform them we're adopting
1482 # the same policy this year and suggest recommendations for future years.
1483 #
1484 # For now we will assume permanent summer time for the Falklands
1485 # until advised differently (to apply for 2012 and beyond, after the 2011
1486 # experiment was apparently successful.)
1487 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1488 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
1489 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1490 Rule Falk 1939 only - Oct 1 0:00 1:00 S
1491 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
1492 Rule Falk 1943 only - Jan 1 0:00 0 -
1493 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
1494 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1495 Rule Falk 1984 only - Sep 16 0:00 1:00 S
1496 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
1497 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1498 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1499 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 S
1500 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1501 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1502 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1503 -4:00 Falk -04/-03 1983 May
1504 -3:00 Falk -03/-02 1985 Sep 15
1505 -4:00 Falk -04/-03 2010 Sep 5 2:00
1506 -3:00 - -03
1507
1508 # French Guiana
1509 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1510 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1511 -4:00 - -04 1967 Oct
1512 -3:00 - -03
1513
1514 # Guyana
1515 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1516 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1517 -3:45 - -0345 1975 Jul 31
1518 -3:00 - -03 1991
1519 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1520 -4:00 - -04
1521
1522 # Paraguay
1523 #
1524 # From Paul Eggert (2006-03-22):
1525 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1526 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1527 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1528 #
1529 # From Waldemar Villamayor-Venialbo (2013-09-20):
1530 # No time of the day is established for the adjustment, so people normally
1531 # adjust their clocks at 0 hour of the given dates.
1532 #
1533 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1534 Rule Para 1975 1988 - Oct 1 0:00 1:00 S
1535 Rule Para 1975 1978 - Mar 1 0:00 0 -
1536 Rule Para 1979 1991 - Apr 1 0:00 0 -
1537 Rule Para 1989 only - Oct 22 0:00 1:00 S
1538 Rule Para 1990 only - Oct 1 0:00 1:00 S
1539 Rule Para 1991 only - Oct 6 0:00 1:00 S
1540 Rule Para 1992 only - Mar 1 0:00 0 -
1541 Rule Para 1992 only - Oct 5 0:00 1:00 S
1542 Rule Para 1993 only - Mar 31 0:00 0 -
1543 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
1544 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1545 Rule Para 1996 only - Mar 1 0:00 0 -
1546 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1547 # From Steffen Thorsen (2000-10-02):
1548 # I have three independent reports that Paraguay changed to DST this Sunday
1549 # (10-01).
1550 #
1551 # Translated by Gwillim Law (2001-02-27) from
1552 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1553 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1554 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1555 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1556 # system has been operating for several years. Formerly there was a separate
1557 # decree each year; the new law has the same effect, but permanently. Every
1558 # year, the time will change on the first Sunday of October; likewise, the
1559 # clock will be set back on the first Sunday of March.
1560 #
1561 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
1562 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1563 Rule Para 1997 only - Feb lastSun 0:00 0 -
1564 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1565 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1566 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1567 # From Rives McDow (2002-02-28):
1568 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
1569 # dst method to be from the first Sunday in September to the first Sunday in
1570 # April.
1571 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1572 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
1573 #
1574 # From Jesper Nørgaard Welen (2005-01-02):
1575 # There are several sources that claim that Paraguay made
1576 # a timezone rule change in autumn 2004.
1577 # From Steffen Thorsen (2005-01-05):
1578 # Decree 1,867 (2004-03-05)
1579 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1580 # http://www.presidencia.gov.py/decretos/D1867.pdf
1581 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 S
1582 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1583 # From Carlos Raúl Perasso (2010-02-18):
1584 # By decree number 3958 issued yesterday
1585 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1586 # Paraguay changes its DST schedule, postponing the March rule to April and
1587 # modifying the October date. The decree reads:
1588 # ...
1589 # Art. 1. It is hereby established that from the second Sunday of the month of
1590 # April of this year (2010), the official time is to be set back 60 minutes,
1591 # and that on the first Sunday of the month of October, it is to be set
1592 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1593 # ...
1594 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 S
1595 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1596 #
1597 # From Steffen Thorsen (2013-03-07):
1598 # Paraguay will end DST on 2013-03-24 00:00....
1599 # http://www.ande.gov.py/interna.php?id=1075
1600 #
1601 # From Carlos Raúl Perasso (2013-03-15):
1602 # The change in Paraguay is now final. Decree number 10780
1603 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1604 # From Carlos Raúl Perasso (2014-02-28):
1605 # Decree 1264 can be found at:
1606 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1607 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1608
1609 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1610 Zone America/Asuncion -3:50:40 - LMT 1890
1611 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1612 -4:00 - -04 1972 Oct
1613 -3:00 - -03 1974 Apr
1614 -4:00 Para -04/-03
1615
1616 # Peru
1617 #
1618 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1619 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1620 # When we were in Peru in 1985-1986, they apparently switched over
1621 # sometime between December 29 and January 3 while we were on the Amazon.
1622 #
1623 # From Paul Eggert (2006-03-22):
1624 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1625
1626 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1627 Rule Peru 1938 only - Jan 1 0:00 1:00 S
1628 Rule Peru 1938 only - Apr 1 0:00 0 -
1629 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
1630 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1631 Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
1632 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1633 Rule Peru 1990 only - Jan 1 0:00 1:00 S
1634 Rule Peru 1990 only - Apr 1 0:00 0 -
1635 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1636 Rule Peru 1994 only - Jan 1 0:00 1:00 S
1637 Rule Peru 1994 only - Apr 1 0:00 0 -
1638 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1639 Zone America/Lima -5:08:12 - LMT 1890
1640 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1641 -5:00 Peru -05/-04
1642
1643 # South Georgia
1644 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1645 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1646 -2:00 - -02
1647
1648 # South Sandwich Is
1649 # uninhabited; scientific personnel have wintered
1650
1651 # Suriname
1652 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1653 Zone America/Paramaribo -3:40:40 - LMT 1911
1654 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1655 -3:40:36 - PMT 1945 Oct # The capital moved?
1656 -3:30 - -0330 1984 Oct
1657 -3:00 - -03
1658
1659 # Trinidad and Tobago
1660 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1661 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
1662 -4:00 - AST
1663
1664 # These all agree with Trinidad and Tobago since 1970.
1665 Link America/Port_of_Spain America/Anguilla
1666 Link America/Port_of_Spain America/Antigua
1667 Link America/Port_of_Spain America/Dominica
1668 Link America/Port_of_Spain America/Grenada
1669 Link America/Port_of_Spain America/Guadeloupe
1670 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1671 Link America/Port_of_Spain America/Montserrat
1672 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1673 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1674 Link America/Port_of_Spain America/St_Lucia
1675 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1676 Link America/Port_of_Spain America/St_Vincent
1677 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1678
1679 # Uruguay
1680 # From Paul Eggert (1993-11-18):
1681 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1682 # From Shanks & Pottenger:
1683 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1684 # Whitman gives 1923 Oct 1; go with Shanks & Pottenger.
1685 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1686 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1687 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1688 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1689 # Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman.
1690 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1691 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1692 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1693 # Whitman gives 1937 Oct 3; go with Shanks & Pottenger.
1694 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1695 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1696 # and 1943 Apr 13 "to present time"; go with Shanks & Pottenger.
1697 Rule Uruguay 1941 only - Aug 1 0:00 0:30 HS
1698 Rule Uruguay 1942 only - Jan 1 0:00 0 -
1699 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1700 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1701 Rule Uruguay 1959 only - May 24 0:00 1:00 S
1702 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1703 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1704 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1705 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1706 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1707 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1708 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1709 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1710 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1711 Rule Uruguay 1972 only - Aug 15 0:00 0 -
1712 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1713 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1714 Rule Uruguay 1976 only - Oct 1 0:00 0 -
1715 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1716 Rule Uruguay 1978 only - Apr 1 0:00 0 -
1717 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1718 Rule Uruguay 1980 only - May 1 0:00 0 -
1719 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1720 Rule Uruguay 1988 only - Mar 14 0:00 0 -
1721 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1722 Rule Uruguay 1989 only - Mar 12 0:00 0 -
1723 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1724 # Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2,
1725 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1726 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1727 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1728 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1729 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1730 # From Eduardo Cota (2004-09-20):
1731 # The Uruguayan government has decreed a change in the local time....
1732 # http://www.presidencia.gub.uy/decretos/2004091502.htm
1733 Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1734 # From Steffen Thorsen (2005-03-11):
1735 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1736 # save energy ... it was postponed two weeks....
1737 # http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1738 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1739 # From Eduardo Cota (2005-09-27):
1740 # http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1741 # This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1742 # 02:00 local time, official time in Uruguay will be at GMT -2.
1743 Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1744 Rule Uruguay 2006 only - Mar 12 2:00 0 -
1745 # From Jesper Nørgaard Welen (2006-09-06):
1746 # http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF
1747 #
1748 # From Steffen Thorsen (2015-06-30):
1749 # ... it looks like they will not be using DST the coming summer:
1750 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
1751 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
1752 # From Paul Eggert (2015-06-30):
1753 # Apparently restaurateurs complained that DST caused people to go to the beach
1754 # instead of out to dinner.
1755 # From Pablo Camargo (2015-07-13):
1756 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
1757 # [dated 2015-06-29; repeals Decree 311/006 dated 2006-09-04]
1758 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 S
1759 Rule Uruguay 2007 2015 - Mar Sun>=8 2:00 0 -
1760
1761 # This Zone can be simplified once we assume zic %z.
1762 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1763 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1764 -3:30 Uruguay -0330/-03 1942 Dec 14
1765 -3:00 Uruguay -03/-02 1968
1766 -3:00 Uruguay -03/-0230 1971
1767 -3:00 Uruguay -03/-02 1974
1768 -3:00 Uruguay -03/-0230 1974 Dec 22
1769 -3:00 Uruguay -03/-02
1770
1771 # Venezuela
1772 #
1773 # From Paul Eggert (2015-07-28):
1774 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
1775 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
1776 #
1777 # From John Stainforth (2007-11-28):
1778 # ... the change for Venezuela originally expected for 2007-12-31 has
1779 # been brought forward to 2007-12-09. The official announcement was
1780 # published today in the "Gaceta Oficial de la República Bolivariana
1781 # de Venezuela, número 38.819" (official document for all laws or
1782 # resolution publication)
1783 # http://www.globovision.com/news.php?nid=72208
1784
1785 # From Alexander Krivenyshev (2016-04-15):
1786 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
1787 #
1788 # From Paul Eggert (2016-04-15):
1789 # Clocks advance 30 minutes on 2016-05-01 at 02:30....
1790 # "'Venezuela's new time-zone: hours without light, hours without water,
1791 # hours of presidential broadcasts, hours of lines,' quipped comedian
1792 # Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps
1793 # half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400
1794 # https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE
1795 #
1796 # From Matt Johnson (2016-04-20):
1797 # ... published in the official Gazette [2016-04-18], here:
1798 # http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf
1799
1800 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1801 Zone America/Caracas -4:27:44 - LMT 1890
1802 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1803 -4:30 - -0430 1965 Jan 1 0:00
1804 -4:00 - -04 2007 Dec 9 3:00
1805 -4:30 - -0430 2016 May 1 2:30
1806 -4:00 - -04