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2 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 #
4 # This code is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License version 2 only, as
6 # published by the Free Software Foundation. Oracle designates this
7 # particular file as subject to the "Classpath" exception as provided
8 # by Oracle in the LICENSE file that accompanied this code.
9 #
10 # This code is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # version 2 for more details (a copy is included in the LICENSE file that
14 # accompanied this code).
15 #
16 # You should have received a copy of the GNU General Public License version
17 # 2 along with this work; if not, write to the Free Software Foundation,
18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 #
20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 # or visit www.oracle.com if you need additional information or have any
22 # questions.
23 #
24 # This file is in the public domain, so clarified as of
25 # 2009-05-17 by Arthur David Olson.
26
27 # This file is by no means authoritative; if you think you know better,
28 # go ahead and edit the file (and please send any changes to
29 # tz@iana.org for general use in the future). For more, please see
30 # the file CONTRIBUTING in the tz distribution.
31
32 # From Paul Eggert (2016-12-05):
33 #
34 # Unless otherwise specified, the source for data through 1990 is:
35 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
36 # San Diego: ACS Publications, Inc. (2003).
37 # Unfortunately this book contains many errors and cites no sources.
38 #
39 # Many years ago Gwillim Law wrote that a good source
40 # for time zone data was the International Air Transport
41 # Association's Standard Schedules Information Manual (IATA SSIM),
42 # published semiannually. Law sent in several helpful summaries
43 # of the IATA's data after 1990. Except where otherwise noted,
44 # IATA SSIM is the source for entries after 1990.
45 #
46 # For data circa 1899, a common source is:
47 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
48 # https://www.jstor.org/stable/1774359
49 #
50 # These tables use numeric abbreviations like -03 and -0330 for
51 # integer hour and minute UT offsets. Although earlier editions used
52 # alphabetic time zone abbreviations, these abbreviations were
53 # invented and did not reflect common practice.
54
55 ###############################################################################
56
57 ###############################################################################
58
59 # Argentina
60
61 # From Bob Devine (1988-01-28):
62 # Argentina: first Sunday in October to first Sunday in April since 1976.
63 # Double Summer time from 1969 to 1974. Switches at midnight.
64
65 # From U. S. Naval Observatory (1988-01-19):
66 # ARGENTINA 3 H BEHIND UTC
67
68 # From Hernan G. Otero (1995-06-26):
69 # I am sending modifications to the Argentine time zone table...
70 # AR was chosen because they are the ISO letters that represent Argentina.
71
72 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
73 Rule Arg 1930 only - Dec 1 0:00 1:00 S
74 Rule Arg 1931 only - Apr 1 0:00 0 -
75 Rule Arg 1931 only - Oct 15 0:00 1:00 S
76 Rule Arg 1932 1940 - Mar 1 0:00 0 -
77 Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
78 Rule Arg 1940 only - Jul 1 0:00 1:00 S
79 Rule Arg 1941 only - Jun 15 0:00 0 -
80 Rule Arg 1941 only - Oct 15 0:00 1:00 S
81 Rule Arg 1943 only - Aug 1 0:00 0 -
82 Rule Arg 1943 only - Oct 15 0:00 1:00 S
83 Rule Arg 1946 only - Mar 1 0:00 0 -
84 Rule Arg 1946 only - Oct 1 0:00 1:00 S
85 Rule Arg 1963 only - Oct 1 0:00 0 -
86 Rule Arg 1963 only - Dec 15 0:00 1:00 S
87 Rule Arg 1964 1966 - Mar 1 0:00 0 -
88 Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
89 Rule Arg 1967 only - Apr 2 0:00 0 -
90 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
91 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
92 Rule Arg 1974 only - Jan 23 0:00 1:00 S
93 Rule Arg 1974 only - May 1 0:00 0 -
94 Rule Arg 1988 only - Dec 1 0:00 1:00 S
95 #
96 # From Hernan G. Otero (1995-06-26):
97 # These corrections were contributed by InterSoft Argentina S.A.,
98 # obtaining the data from the:
99 # Talleres de Hidrografía Naval Argentina
100 # (Argentine Naval Hydrography Institute)
101 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
102 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
103 #
104 # From Hernan G. Otero (1995-06-26):
105 # From this moment on, the law that mandated the daylight saving
106 # time corrections was derogated and no more modifications
107 # to the time zones (for daylight saving) are now made.
108 #
109 # From Rives McDow (2000-01-10):
110 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
111 # which did not result in the switch of a time zone, as they stayed 9 hours
112 # from the International Date Line.
113 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
114 # From Paul Eggert (2007-12-28):
115 # DST was set to expire on March 5, not March 3, but since it was converted
116 # to standard time on March 3 it's more convenient for us to pretend that
117 # it ended on March 3.
118 Rule Arg 2000 only - Mar 3 0:00 0 -
119 #
120 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
121 # We just checked with our São Paulo office and they say the government of
122 # Argentina decided not to become one of the countries that go on or off DST.
123 # So Buenos Aires should be -3 hours from GMT at all times.
124 #
125 # From Fabián L. Arce Jofré (2000-04-04):
126 # The law that claimed DST for Argentina was derogated by President Fernando
127 # de la Rúa on March 2, 2000, because it would make people spend more energy
128 # in the winter time, rather than less. The change took effect on March 3.
129 #
130 # From Mariano Absatz (2001-06-06):
131 # one of the major newspapers here in Argentina said that the 1999
132 # Timezone Law (which never was effectively applied) will (would?) be
133 # in effect.... The article is at
134 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm
135 # ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted
136 # 1999-09-17, and published 1999-09-21. The official publication is at:
137 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
138 # Regretfully, you have to subscribe (and pay) for the on-line version....
139 #
140 # (2001-06-12):
141 # the timezone for Argentina will not change next Sunday.
142 # Apparently it will do so on Sunday 24th....
143 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm
144 #
145 # (2001-06-25):
146 # Last Friday (yes, the last working day before the date of the change), the
147 # Senate annulled the 1999 law that introduced the changes later postponed.
148 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
149 # It remains the vote of the Deputies..., but it will be the same....
150 # This kind of things had always been done this way in Argentina.
151 # We are still -03:00 all year round in all of the country.
152 #
153 # From Steffen Thorsen (2007-12-21):
154 # A user (Leonardo Chaim) reported that Argentina will adopt DST....
155 # all of the country (all Zone-entries) are affected. News reports like
156 # http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate
157 # that Argentina will use DST next year as well, from October to
158 # March, although exact rules are not given.
159 #
160 # From Jesper Nørgaard Welen (2007-12-26)
161 # The last hurdle of Argentina DST is over, the proposal was approved in
162 # the lower chamber too (Diputados) with a vote 192 for and 2 against.
163 # By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to
164 # the original scanned proposal, where the dates and the zero hours are
165 # clear and unambiguous...This is the article about final approval:
166 # http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996
167 #
168 # From Paul Eggert (2007-12-22):
169 # For dates after mid-2008, the following rules are my guesses and
170 # are quite possibly wrong, but are more likely than no DST at all.
171
172 # From Alexander Krivenyshev (2008-09-05):
173 # As per message from Carlos Alberto Fonseca Arauz (Nicaragua),
174 # Argentina will start DST on Sunday October 19, 2008.
175 #
176 # http://www.worldtimezone.com/dst_news/dst_news_argentina03.html
177 # http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)
178
179 # From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07)
180 # via Rodrigo Severo:
181 # Argentinian law No. 25.155 is no longer valid.
182 # http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm
183 # The new one is law No. 26.350
184 # http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm
185 # So there is no summer time in Argentina for now.
186
187 # From Mariano Absatz (2008-10-20):
188 # Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST
189 # in Argentina from 2008-10-19 until 2009-03-15.
190 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01
191 #
192
193 # Decree 1705/2008 excepting 12 Provinces from applying DST in the summer
194 # 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La
195 # Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego
196 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
197 #
198 # Press release 235 dated Saturday October 18th, from the Government of the
199 # Province of Jujuy saying it will not apply DST either (even when it was not
200 # included in Decree 1705/2008).
201 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
202
203 # From fullinet (2009-10-18):
204 # As announced in
205 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
206 # (an official .gob.ar) under title: "Sin Cambio de Hora"
207 # (English: "No hour change").
208 #
209 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
210 # oficial, decisión que estaba en estudio para su implementación el
211 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
212 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
213 # la modificación del huso horario, ya que 2009 nos encuentra con
214 # crecimiento en la producción y distribución energética."
215
216 Rule Arg 2007 only - Dec 30 0:00 1:00 S
217 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
218 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 S
219
220 # From Mariano Absatz (2004-05-21):
221 # Today it was officially published that the Province of Mendoza is changing
222 # its timezone this winter... starting tomorrow night....
223 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
224 # From Paul Eggert (2004-05-24):
225 # It's Law No. 7,210. This change is due to a public power emergency, so for
226 # now we'll assume it's for this year only.
227 #
228 # From Paul Eggert (2014-08-09):
229 # Hora de verano para la República Argentina
230 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
231 # says that standard time in Argentina from 1894-10-31
232 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
233 # over Shanks & Pottenger.
234 #
235 # From Mariano Absatz (2004-06-05):
236 # These media articles from a major newspaper mostly cover the current state:
237 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
238 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
239 #
240 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
241 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
242 # Apparently, all nine provinces would go back to UTC-03:00 at the same
243 # time in October 17th.
244 #
245 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
246 # Tierra del Fuego, Tucumán.
247 #
248 # From Mariano Absatz (2004-06-14):
249 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
250 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
251 # annoyance with the change is much higher than the power savings obtained....
252 #
253 # From Gwillim Law (2004-06-14):
254 # http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
255 # "The time change in Tierra del Fuego was a conflicted decision from
256 # the start. The government had decreed that the measure would take
257 # effect on June 1, but a normative error forced the new time to begin
258 # three days earlier, from a Saturday to a Sunday....
259 # Our understanding was that the change was originally scheduled to take place
260 # on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
261 # provinces). Sunday was May 30, only two days earlier. So the article
262 # contains a contradiction. I would give more credence to the Saturday/Sunday
263 # date than the "three days earlier" phrase, and conclude that Tierra del
264 # Fuego set its clocks back at 2004-05-30 00:00.
265 #
266 # From Steffen Thorsen (2004-10-05):
267 # The previous law 7210 which changed the province of Mendoza's time zone
268 # back in May have been modified slightly in a new law 7277, which set the
269 # new end date to 2004-09-26 (original date was 2004-10-17).
270 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
271 #
272 # From Mariano Absatz (2004-10-05):
273 # San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
274 # Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
275 # at midnight between Saturday, July 24th and Sunday, July 25th....
276 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html
277 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html
278 # http://www.sanjuan.gov.ar/prensa/archivo/000441.html
279
280 # From Alex Krivenyshev (2008-01-17):
281 # Here are articles that Argentina Province San Luis is planning to end DST
282 # as earlier as upcoming Monday January 21, 2008 or February 2008:
283 #
284 # Provincia argentina retrasa reloj y marca diferencia con resto del país
285 # (Argentine Province delayed clock and mark difference with the rest of the
286 # country)
287 # http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel
288 #
289 # Es inminente que en San Luis atrasen una hora los relojes
290 # (It is imminent in San Luis clocks one hour delay)
291 # https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html
292 # http://www.worldtimezone.com/dst_news/dst_news_argentina02.html
293
294 # From Jesper Nørgaard Welen (2008-01-18):
295 # The page of the San Luis provincial government
296 # http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812
297 # confirms what Alex Krivenyshev has earlier sent to the tz
298 # emailing list about that San Luis plans to return to standard
299 # time much earlier than the rest of the country. It also
300 # confirms that upon request the provinces San Juan and Mendoza
301 # refused to follow San Luis in this change.
302 #
303 # The change is supposed to take place Monday the 21st at 0:00
304 # hours. As far as I understand it if this goes ahead, we need
305 # a new timezone for San Luis (although there are also documented
306 # independent changes in the southamerica file of San Luis in
307 # 1990 and 1991 which has not been confirmed).
308
309 # From Jesper Nørgaard Welen (2008-01-25):
310 # Unfortunately the below page has become defunct, about the San Luis
311 # time change. Perhaps because it now is part of a group of pages "Most
312 # important pages of 2008."
313 #
314 # You can use
315 # http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834
316 # instead it seems. Or use "Buscador" from the main page of the San Luis
317 # government, and fill in "huso" and click OK, and you will get 3 pages
318 # from which the first one is identical to the above.
319
320 # From Mariano Absatz (2008-01-28):
321 # I can confirm that the Province of San Luis (and so far only that
322 # province) decided to go back to UTC-3 effective midnight Jan 20th 2008
323 # (that is, Monday 21st at 0:00 is the time the clocks were delayed back
324 # 1 hour), and they intend to keep UTC-3 as their timezone all year round
325 # (that is, unless they change their mind any minute now).
326 #
327 # So we'll have to add yet another city to 'southamerica' (I think San
328 # Luis city is the mos populated city in the Province, so it'd be
329 # America/Argentina/San_Luis... of course I can't remember if San Luis's
330 # history of particular changes goes along with Mendoza or San Juan :-(
331 # (I only remember not being able to collect hard facts about San Luis
332 # back in 2004, when these provinces changed to UTC-4 for a few days, I
333 # mailed them personally and never got an answer).
334
335 # From Paul Eggert (2014-08-12):
336 # Unless otherwise specified, data entries are from Shanks & Pottenger through
337 # 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that
338 # America/Cordoba split into 6 subregions during 1991/1992, one of which
339 # was America/San_Luis, but we haven't verified this yet so for now we'll
340 # keep America/Cordoba a single region rather than splitting it into the
341 # other 5 subregions.
342
343 # From Mariano Absatz (2009-03-13):
344 # Yesterday (with our usual 2-day notice) the Province of San Luis
345 # decided that next Sunday instead of "staying" @utc-03:00 they will go
346 # to utc-04:00 until the second Saturday in October...
347 #
348 # The press release is at
349 # http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
350 # (I couldn't find the decree, but www.sanluis.gov.ar
351 # is the official page for the Province Government.)
352 #
353 # There's also a note in only one of the major national papers ...
354 # http://www.lanacion.com.ar/nota.asp?nota_id=1107912
355 #
356 # The press release says [quick and dirty translation]:
357 # ... announced that next Sunday, at 00:00, Puntanos (the San Luis
358 # inhabitants) will have to turn back one hour their clocks
359 #
360 # Since then, San Luis will establish its own Province timezone. Thus,
361 # during 2009, this timezone change will run from 00:00 the third Sunday
362 # in March until 24:00 of the second Saturday in October.
363
364 # From Mariano Absatz (2009-10-16):
365 # ...the Province of San Luis is a case in itself.
366 #
367 # The Law at
368 # http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276
369 # is ambiguous because establishes a calendar from the 2nd Sunday in
370 # October at 0:00 thru the 2nd Saturday in March at 24:00 and the
371 # complement of that starting on the 2nd Sunday of March at 0:00 and
372 # ending on the 2nd Saturday of March at 24:00.
373 #
374 # This clearly breaks every time the 1st of March or October is a Sunday.
375 #
376 # IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd
377 # Sunday of October and March.
378 #
379 # The problem is that the changes in the rest of the Provinces that did
380 # change in 2007/2008, were made according to the Federal Law and Decrees
381 # that did so on the 3rd Sunday of October and March.
382 #
383 # In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday
384 # (October 11th) at 0:00.
385 #
386 # So I guess a new set of rules, besides "Arg", must be made and the last
387 # America/Argentina/San_Luis entries should change to use these...
388 # ...
389
390 # From Alexander Krivenyshev (2010-04-09):
391 # According to news reports from El Diario de la República Province San
392 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
393 # after April 11, 2010 - will continue to have same time as rest of
394 # Argentina (UTC-3) (no DST).
395 #
396 # Confirmaron la prórroga del huso horario de verano (Spanish)
397 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
398 # or (some English translation):
399 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
400
401 # From Mariano Absatz (2010-04-12):
402 # yes...I can confirm this...and given that San Luis keeps calling
403 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
404 # rules...San Luis is still using "Western ARgentina Time" and it got
405 # stuck on Summer daylight savings time even though the summer is over.
406
407 # From Paul Eggert (2013-09-05):
408 # Perhaps San Luis operates on the legal fiction that it is at -04
409 # with perpetual summer time, but ordinary usage typically seems to
410 # just say it's at -03; see, for example,
411 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
412 # We've documented similar situations as being plain changes to
413 # standard time, so let's do that here too. This does not change UTC
414 # offsets, only tm_isdst and the time zone abbreviations. One minor
415 # plus is that this silences a zic complaint that there's no POSIX TZ
416 # setting for time stamps past 2038.
417
418 # From Paul Eggert (2013-02-21):
419 # Milne says Córdoba time was -4:16:48.2. Round to the nearest second.
420
421 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
422 #
423 # Buenos Aires (BA), Capital Federal (CF),
424 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
425 -4:16:48 - CMT 1920 May # Córdoba Mean Time
426 -4:00 - -04 1930 Dec
427 -4:00 Arg -04/-03 1969 Oct 5
428 -3:00 Arg -03/-02 1999 Oct 3
429 -4:00 Arg -04/-03 2000 Mar 3
430 -3:00 Arg -03/-02
431 #
432 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
433 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
434 #
435 # Shanks & Pottenger also make the following claims, which we haven't verified:
436 # - Formosa switched to -3:00 on 1991-01-07.
437 # - Misiones switched to -3:00 on 1990-12-29.
438 # - Chaco switched to -3:00 on 1991-01-04.
439 # - Santiago del Estero switched to -4:00 on 1991-04-01,
440 # then to -3:00 on 1991-04-26.
441 #
442 Zone America/Argentina/Cordoba -4:16:48 - 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 Arg -03/-02
451 #
452 # Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN)
453 Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31
454 -4:16:48 - CMT 1920 May
455 -4:00 - -04 1930 Dec
456 -4:00 Arg -04/-03 1969 Oct 5
457 -3:00 Arg -03/-02 1991 Mar 3
458 -4:00 - -04 1991 Oct 20
459 -3:00 Arg -03/-02 1999 Oct 3
460 -4:00 Arg -04/-03 2000 Mar 3
461 -3:00 Arg -03/-02 2008 Oct 18
462 -3:00 - -03
463 #
464 # Tucumán (TM)
465 Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
466 -4:16:48 - CMT 1920 May
467 -4:00 - -04 1930 Dec
468 -4:00 Arg -04/-03 1969 Oct 5
469 -3:00 Arg -03/-02 1991 Mar 3
470 -4:00 - -04 1991 Oct 20
471 -3:00 Arg -03/-02 1999 Oct 3
472 -4:00 Arg -04/-03 2000 Mar 3
473 -3:00 - -03 2004 Jun 1
474 -4:00 - -04 2004 Jun 13
475 -3:00 Arg -03/-02
476 #
477 # La Rioja (LR)
478 Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
479 -4:16:48 - CMT 1920 May
480 -4:00 - -04 1930 Dec
481 -4:00 Arg -04/-03 1969 Oct 5
482 -3:00 Arg -03/-02 1991 Mar 1
483 -4:00 - -04 1991 May 7
484 -3:00 Arg -03/-02 1999 Oct 3
485 -4:00 Arg -04/-03 2000 Mar 3
486 -3:00 - -03 2004 Jun 1
487 -4:00 - -04 2004 Jun 20
488 -3:00 Arg -03/-02 2008 Oct 18
489 -3:00 - -03
490 #
491 # San Juan (SJ)
492 Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
493 -4:16:48 - CMT 1920 May
494 -4:00 - -04 1930 Dec
495 -4:00 Arg -04/-03 1969 Oct 5
496 -3:00 Arg -03/-02 1991 Mar 1
497 -4:00 - -04 1991 May 7
498 -3:00 Arg -03/-02 1999 Oct 3
499 -4:00 Arg -04/-03 2000 Mar 3
500 -3:00 - -03 2004 May 31
501 -4:00 - -04 2004 Jul 25
502 -3:00 Arg -03/-02 2008 Oct 18
503 -3:00 - -03
504 #
505 # Jujuy (JY)
506 Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
507 -4:16:48 - CMT 1920 May
508 -4:00 - -04 1930 Dec
509 -4:00 Arg -04/-03 1969 Oct 5
510 -3:00 Arg -03/-02 1990 Mar 4
511 -4:00 - -04 1990 Oct 28
512 -4:00 1:00 -03 1991 Mar 17
513 -4:00 - -04 1991 Oct 6
514 -3:00 1:00 -02 1992
515 -3:00 Arg -03/-02 1999 Oct 3
516 -4:00 Arg -04/-03 2000 Mar 3
517 -3:00 Arg -03/-02 2008 Oct 18
518 -3:00 - -03
519 #
520 # Catamarca (CT), Chubut (CH)
521 Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
522 -4:16:48 - CMT 1920 May
523 -4:00 - -04 1930 Dec
524 -4:00 Arg -04/-03 1969 Oct 5
525 -3:00 Arg -03/-02 1991 Mar 3
526 -4:00 - -04 1991 Oct 20
527 -3:00 Arg -03/-02 1999 Oct 3
528 -4:00 Arg -04/-03 2000 Mar 3
529 -3:00 - -03 2004 Jun 1
530 -4:00 - -04 2004 Jun 20
531 -3:00 Arg -03/-02 2008 Oct 18
532 -3:00 - -03
533 #
534 # Mendoza (MZ)
535 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
536 -4:16:48 - CMT 1920 May
537 -4:00 - -04 1930 Dec
538 -4:00 Arg -04/-03 1969 Oct 5
539 -3:00 Arg -03/-02 1990 Mar 4
540 -4:00 - -04 1990 Oct 15
541 -4:00 1:00 -03 1991 Mar 1
542 -4:00 - -04 1991 Oct 15
543 -4:00 1:00 -03 1992 Mar 1
544 -4:00 - -04 1992 Oct 18
545 -3:00 Arg -03/-02 1999 Oct 3
546 -4:00 Arg -04/-03 2000 Mar 3
547 -3:00 - -03 2004 May 23
548 -4:00 - -04 2004 Sep 26
549 -3:00 Arg -03/-02 2008 Oct 18
550 -3:00 - -03
551 #
552 # San Luis (SL)
553
554 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
555 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 S
556
557 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
558 -4:16:48 - CMT 1920 May
559 -4:00 - -04 1930 Dec
560 -4:00 Arg -04/-03 1969 Oct 5
561 -3:00 Arg -03/-02 1990
562 -3:00 1:00 -02 1990 Mar 14
563 -4:00 - -04 1990 Oct 15
564 -4:00 1:00 -03 1991 Mar 1
565 -4:00 - -04 1991 Jun 1
566 -3:00 - -03 1999 Oct 3
567 -4:00 1:00 -03 2000 Mar 3
568 -3:00 - -03 2004 May 31
569 -4:00 - -04 2004 Jul 25
570 -3:00 Arg -03/-02 2008 Jan 21
571 -4:00 SanLuis -04/-03 2009 Oct 11
572 -3:00 - -03
573 #
574 # Santa Cruz (SC)
575 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
576 -4:16:48 - CMT 1920 May
577 -4:00 - -04 1930 Dec
578 -4:00 Arg -04/-03 1969 Oct 5
579 -3:00 Arg -03/-02 1999 Oct 3
580 -4:00 Arg -04/-03 2000 Mar 3
581 -3:00 - -03 2004 Jun 1
582 -4:00 - -04 2004 Jun 20
583 -3:00 Arg -03/-02 2008 Oct 18
584 -3:00 - -03
585 #
586 # Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF)
587 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
588 -4:16:48 - CMT 1920 May
589 -4:00 - -04 1930 Dec
590 -4:00 Arg -04/-03 1969 Oct 5
591 -3:00 Arg -03/-02 1999 Oct 3
592 -4:00 Arg -04/-03 2000 Mar 3
593 -3:00 - -03 2004 May 30
594 -4:00 - -04 2004 Jun 20
595 -3:00 Arg -03/-02 2008 Oct 18
596 -3:00 - -03
597
598 # Aruba
599 Link America/Curacao America/Aruba
600
601 # Bolivia
602 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
603 Zone America/La_Paz -4:32:36 - LMT 1890
604 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
605 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST
606 -4:00 - -04
607
608 # Brazil
609
610 # From Paul Eggert (1993-11-18):
611 # The mayor of Rio recently attempted to change the time zone rules
612 # just in his city, in order to leave more summer time for the tourist trade.
613 # The rule change lasted only part of the day;
614 # the federal government refused to follow the city's rules, and business
615 # was in a chaos, so the mayor backed down that afternoon.
616
617 # From IATA SSIM (1996-02):
618 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
619 # Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ),
620 # Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO),
621 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
622 # [The last three states are new to this issue of the IATA SSIM.]
623
624 # From Gwillim Law (1996-10-07):
625 # Geography, history (Tocantins was part of Goiás until 1989), and other
626 # sources of time zone information lead me to believe that AL, SE, and TO were
627 # always in BR1, and so the only change was whether or not they observed DST....
628 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
629 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
630 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
631 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
632 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
633 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
634 # become part of the state of Pernambuco). The boundary between BR1 and BR2
635 # has never been clearly stated. They've simply been called East and West.
636 # However, some conclusions can be drawn from another IATA manual: the Airline
637 # Coding Directory, which lists close to 400 airports in Brazil. For each
638 # airport it gives a time zone which is coded to the SSIM. From that
639 # information, I'm led to conclude that the states of Amapá (AP), Ceará (CE),
640 # Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do
641 # Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST.
642
643 # From Marcos Tadeu (1998-09-27):
644 # Brazilian official page <http://pcdsh01.on.br/verao1.html>
645
646 # From Jesper Nørgaard (2000-11-03):
647 # [For an official list of which regions in Brazil use which time zones, see:]
648 # http://pcdsh01.on.br/Fusbr.htm
649 # http://pcdsh01.on.br/Fusbrhv.htm
650
651 # From Celso Doria via David Madeo (2002-10-09):
652 # The reason for the delay this year has to do with elections in Brazil.
653 #
654 # Unlike in the United States, elections in Brazil are 100% computerized and
655 # the results are known almost immediately. Yesterday, it was the first
656 # round of the elections when 115 million Brazilians voted for President,
657 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is
658 # counting (or re-counting) votes anymore and we know there will be a second
659 # round for the Presidency and also for some Governors. The 2nd round will
660 # take place on October 27th.
661 #
662 # The reason why the DST will only begin November 3rd is that the thousands
663 # of electoral machines used cannot have their time changed, and since the
664 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
665 # the Government decided to postpone DST, instead of changing the Constitution
666 # (maybe, for the next elections, it will be possible to change the clock)...
667
668 # From Rodrigo Severo (2004-10-04):
669 # It's just the biannual change made necessary by the much hyped, supposedly
670 # modern Brazilian eletronic voting machines which, apparently, can't deal
671 # with a time change between the first and the second rounds of the elections.
672
673 # From Steffen Thorsen (2007-09-20):
674 # Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00:
675 # http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975
676
677 # From Paul Schulze (2008-06-24):
678 # ...by law number 11.662 of April 24, 2008 (published in the "Diario
679 # Oficial da União"...) in Brazil there are changes in the timezones,
680 # effective today (00:00am at June 24, 2008) as follows:
681 #
682 # a) The timezone UTC+5 is extinguished, with all the Acre state and the
683 # part of the Amazonas state that had this timezone now being put to the
684 # timezone UTC+4
685 # b) The whole Pará state now is put at timezone UTC+3, instead of just
686 # part of it, as was before.
687 #
688 # This change follows a proposal of senator Tiao Viana of Acre state, that
689 # proposed it due to concerns about open television channels displaying
690 # programs inappropriate to youths in the states that had the timezone
691 # UTC+5 too early in the night. In the occasion, some more corrections
692 # were proposed, trying to unify the timezones of any given state. This
693 # change modifies timezone rules defined in decree 2.784 of 18 June,
694 # 1913.
695
696 # From Rodrigo Severo (2008-06-24):
697 # Just correcting the URL:
698 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008
699 #
700 # As a result of the above Decree I believe the America/Rio_Branco
701 # timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall
702 # be created to represent the...west side of the Pará State. I
703 # suggest this new timezone be called Santarem as the most
704 # important/populated city in the affected area.
705 #
706 # This new timezone would be the same as the Rio_Branco timezone up to
707 # the 2008/06/24 change which would be to UTC-3 instead of UTC-4.
708
709 # From Alex Krivenyshev (2008-06-24):
710 # This is a quick reference page for New and Old Brazil Time Zones map.
711 # http://www.worldtimezone.com/brazil-time-new-old.php
712 #
713 # - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05
714 # (state Acre and the part of the Amazonas will be UTC/GMT-04) - western
715 # part of Par state is moving to one timezone UTC-03 (from UTC-04).
716
717 # From Paul Eggert (2002-10-10):
718 # The official decrees referenced below are mostly taken from
719 # Decretos sobre o Horário de Verão no Brasil.
720 # http://pcdsh01.on.br/DecHV.html
721
722 # From Steffen Thorsen (2008-08-29):
723 # As announced by the government and many newspapers in Brazil late
724 # yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and
725 # it will end on 2009-02-15 (current rule for Brazil is fine). Based on
726 # past years experience with the elections, there was a good chance that
727 # the start was postponed to November, but it did not happen this year.
728 #
729 # It has not yet been posted to http://pcdsh01.on.br/DecHV.html
730 #
731 # An official page about it:
732 # http://www.mme.gov.br/site/news/detail.do?newsId=16722
733 # Note that this link does not always work directly, but must be accessed
734 # by going to
735 # http://www.mme.gov.br/first
736 #
737 # One example link that works directly:
738 # http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54
739 # (Portuguese)
740 #
741 # We have a written a short article about it as well:
742 # https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html
743 #
744 # From Alexander Krivenyshev (2011-10-04):
745 # State Bahia will return to Daylight savings time this year after 8 years off.
746 # The announcement was made by Governor Jaques Wagner in an interview to a
747 # television station in Salvador.
748
749 # In Portuguese:
750 # http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html
751 # https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html
752
753 # From Guilherme Bernardes Rodrigues (2011-10-07):
754 # There is news in the media, however there is still no decree about it.
755 # I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the
756 # official agency about time in Brazil, and she confirmed that the old rule is
757 # still in force.
758
759 # From Guilherme Bernardes Rodrigues (2011-10-14)
760 # It's official, the President signed a decree that includes Bahia in summer
761 # time.
762 # [ and in a second message (same day): ]
763 # I found the decree.
764 #
765 # DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011
766 # Link :
767 # http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6
768
769 # From Kelley Cook (2012-10-16):
770 # The governor of state of Bahia in Brazil announced on Thursday that
771 # due to public pressure, he is reversing the DST policy they implemented
772 # last year and will not be going to Summer Time on October 21st....
773 # http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia
774
775 # From Rodrigo Severo (2012-10-16):
776 # Tocantins state will have DST.
777 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
778
779 # From Steffen Thorsen (2013-09-20):
780 # Tocantins in Brazil is very likely not to observe DST from October....
781 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
782 # We will keep this article updated when this is confirmed:
783 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
784
785 # From Steffen Thorsen (2013-10-17):
786 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
787 # Senator Jorge Viana announced that Acre will change time zone on November 10.
788 # He did not specify the time of the change, nor if western parts of Amazonas
789 # will change as well.
790 #
791 # From Paul Eggert (2013-10-17):
792 # For now, assume western Amazonas will change as well.
793
794 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
795 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
796 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
797 Rule Brazil 1931 only - Oct 3 11:00 1:00 S
798 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
799 Rule Brazil 1932 only - Oct 3 0:00 1:00 S
800 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
801 # revoked DST.
802 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
803 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
804 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
805 Rule Brazil 1950 only - Apr 16 1:00 0 -
806 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
807 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
808 Rule Brazil 1953 only - Mar 1 0:00 0 -
809 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
810 # revoked DST.
811 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
812 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
813 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
814 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
815 # extended the above decree to all of the national territory on 12-09.
816 Rule Brazil 1963 only - Dec 9 0:00 1:00 S
817 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
818 # extended summer time by one day to 1964-03-01 00:00 (start of school).
819 Rule Brazil 1964 only - Mar 1 0:00 0 -
820 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
821 Rule Brazil 1965 only - Jan 31 0:00 1:00 S
822 Rule Brazil 1965 only - Mar 31 0:00 0 -
823 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
824 Rule Brazil 1965 only - Dec 1 0:00 1:00 S
825 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
826 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
827 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
828 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
829 # revoked DST.
830 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
831 Rule Brazil 1985 only - Nov 2 0:00 1:00 S
832 # Decree 92,310 (1986-01-21)
833 # Decree 92,463 (1986-03-13)
834 Rule Brazil 1986 only - Mar 15 0:00 0 -
835 # Decree 93,316 (1986-10-01)
836 Rule Brazil 1986 only - Oct 25 0:00 1:00 S
837 Rule Brazil 1987 only - Feb 14 0:00 0 -
838 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
839 Rule Brazil 1987 only - Oct 25 0:00 1:00 S
840 Rule Brazil 1988 only - Feb 7 0:00 0 -
841 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
842 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
843 Rule Brazil 1988 only - Oct 16 0:00 1:00 S
844 Rule Brazil 1989 only - Jan 29 0:00 0 -
845 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
846 # with the same exceptions
847 Rule Brazil 1989 only - Oct 15 0:00 1:00 S
848 Rule Brazil 1990 only - Feb 11 0:00 0 -
849 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
850 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
851 # Decree 99,629 (1990-10-19) adds BA, MT.
852 Rule Brazil 1990 only - Oct 21 0:00 1:00 S
853 Rule Brazil 1991 only - Feb 17 0:00 0 -
854 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
855 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
856 Rule Brazil 1991 only - Oct 20 0:00 1:00 S
857 Rule Brazil 1992 only - Feb 9 0:00 0 -
858 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
859 # adopted by same states.
860 Rule Brazil 1992 only - Oct 25 0:00 1:00 S
861 Rule Brazil 1993 only - Jan 31 0:00 0 -
862 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
863 # adopted by same states, plus AM.
864 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
865 # web page corrected 2004-01-07) adopted by same states, minus AM.
866 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
867 # adopted by same states, plus MT and TO.
868 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
869 # adds AL, SE.
870 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
871 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
872 Rule Brazil 1996 only - Feb 11 0:00 0 -
873 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
874 # adopted by same states, minus AL, SE.
875 Rule Brazil 1996 only - Oct 6 0:00 1:00 S
876 Rule Brazil 1997 only - Feb 16 0:00 0 -
877 # From Daniel C. Sobral (1998-02-12):
878 # In 1997, the DS began on October 6. The stated reason was that
879 # because international television networks ignored Brazil's policy on DS,
880 # they bought the wrong times on satellite for coverage of Pope's visit.
881 # This year, the ending date of DS was postponed to March 1
882 # to help dealing with the shortages of electric power.
883 #
884 # Decree 2,317 (1997-09-04), adopted by same states.
885 Rule Brazil 1997 only - Oct 6 0:00 1:00 S
886 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
887 # (1998-02-10)
888 Rule Brazil 1998 only - Mar 1 0:00 0 -
889 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
890 # adopted by the same states as before.
891 Rule Brazil 1998 only - Oct 11 0:00 1:00 S
892 Rule Brazil 1999 only - Feb 21 0:00 0 -
893 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
894 # (1999-08-23) adopted by same states.
895 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
896 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
897 Rule Brazil 1999 only - Oct 3 0:00 1:00 S
898 Rule Brazil 2000 only - Feb 27 0:00 0 -
899 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
900 # adopted by the same states as before.
901 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
902 # repeals DST in PE and RR, effective 2000-10-15 00:00.
903 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
904 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
905 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
906 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
907 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
908 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
909 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
910 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
911 Rule Brazil 2002 only - Nov 3 0:00 1:00 S
912 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
913 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
914 Rule Brazil 2003 only - Oct 19 0:00 1:00 S
915 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
916 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
917 Rule Brazil 2004 only - Nov 2 0:00 1:00 S
918 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
919 # adopted by the same states as before.
920 Rule Brazil 2005 only - Oct 16 0:00 1:00 S
921 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
922 # adopted by the same states as before.
923 Rule Brazil 2006 only - Nov 5 0:00 1:00 S
924 Rule Brazil 2007 only - Feb 25 0:00 0 -
925 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
926 # adopted by the same states as before.
927 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
928 # From Frederico A. C. Neves (2008-09-10):
929 # According to this decree
930 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
931 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
932 # 3rd Feb Sunday. There is an exception on the return date when this is
933 # the Carnival Sunday then the return date will be the next Sunday...
934 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 S
935 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
936 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
937 # added Bahia.
938 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
939 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
940 # removed Bahia and added Tocantins.
941 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
942 # removed Tocantins.
943 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
944 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
945 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
946 # From Steffen Thorsen (2017-12-18):
947 # According to many media sources, next year's DST start in Brazil will move to
948 # the first Sunday of November, and it will stay like that for the years after.
949 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
950 # From Steffen Thorsen (2017-12-20):
951 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
952 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 S
953 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
954 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
955 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
956 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
957 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
958 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
959 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
960 # From Arthur David Olson (2008-09-29):
961 # The next is wrong in some years but is better than nothing.
962 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
963
964 # The latest ruleset listed above says that the following states observe DST:
965 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
966
967 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
968 #
969 # Fernando de Noronha (administratively part of PE)
970 Zone America/Noronha -2:09:40 - LMT 1914
971 -2:00 Brazil -02/-01 1990 Sep 17
972 -2:00 - -02 1999 Sep 30
973 -2:00 Brazil -02/-01 2000 Oct 15
974 -2:00 - -02 2001 Sep 13
975 -2:00 Brazil -02/-01 2002 Oct 1
976 -2:00 - -02
977 # Other Atlantic islands have no permanent settlement.
978 # These include Trindade and Martim Vaz (administratively part of ES),
979 # Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE).
980 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
981 # it also included the Penedos.
982 #
983 # Amapá (AP), east Pará (PA)
984 # East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu.
985 # The division between east and west Pará is the river Xingu.
986 # In the north a very small part from the river Javary (now Jari I guess,
987 # the border with Amapá) to the Amazon, then to the Xingu.
988 Zone America/Belem -3:13:56 - LMT 1914
989 -3:00 Brazil -03/-02 1988 Sep 12
990 -3:00 - -03
991 #
992 # west Pará (PA)
993 # West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém.
994 Zone America/Santarem -3:38:48 - LMT 1914
995 -4:00 Brazil -04/-03 1988 Sep 12
996 -4:00 - -04 2008 Jun 24 0:00
997 -3:00 - -03
998 #
999 # Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN),
1000 # Paraíba (PB)
1001 Zone America/Fortaleza -2:34:00 - LMT 1914
1002 -3:00 Brazil -03/-02 1990 Sep 17
1003 -3:00 - -03 1999 Sep 30
1004 -3:00 Brazil -03/-02 2000 Oct 22
1005 -3:00 - -03 2001 Sep 13
1006 -3:00 Brazil -03/-02 2002 Oct 1
1007 -3:00 - -03
1008 #
1009 # Pernambuco (PE) (except Atlantic islands)
1010 Zone America/Recife -2:19:36 - LMT 1914
1011 -3:00 Brazil -03/-02 1990 Sep 17
1012 -3:00 - -03 1999 Sep 30
1013 -3:00 Brazil -03/-02 2000 Oct 15
1014 -3:00 - -03 2001 Sep 13
1015 -3:00 Brazil -03/-02 2002 Oct 1
1016 -3:00 - -03
1017 #
1018 # Tocantins (TO)
1019 Zone America/Araguaina -3:12:48 - LMT 1914
1020 -3:00 Brazil -03/-02 1990 Sep 17
1021 -3:00 - -03 1995 Sep 14
1022 -3:00 Brazil -03/-02 2003 Sep 24
1023 -3:00 - -03 2012 Oct 21
1024 -3:00 Brazil -03/-02 2013 Sep
1025 -3:00 - -03
1026 #
1027 # Alagoas (AL), Sergipe (SE)
1028 Zone America/Maceio -2:22:52 - LMT 1914
1029 -3:00 Brazil -03/-02 1990 Sep 17
1030 -3:00 - -03 1995 Oct 13
1031 -3:00 Brazil -03/-02 1996 Sep 4
1032 -3:00 - -03 1999 Sep 30
1033 -3:00 Brazil -03/-02 2000 Oct 22
1034 -3:00 - -03 2001 Sep 13
1035 -3:00 Brazil -03/-02 2002 Oct 1
1036 -3:00 - -03
1037 #
1038 # Bahia (BA)
1039 # There are too many Salvadors elsewhere, so use America/Bahia instead
1040 # of America/Salvador.
1041 Zone America/Bahia -2:34:04 - LMT 1914
1042 -3:00 Brazil -03/-02 2003 Sep 24
1043 -3:00 - -03 2011 Oct 16
1044 -3:00 Brazil -03/-02 2012 Oct 21
1045 -3:00 - -03
1046 #
1047 # Goiás (GO), Distrito Federal (DF), Minas Gerais (MG),
1048 # Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR),
1049 # Santa Catarina (SC), Rio Grande do Sul (RS)
1050 Zone America/Sao_Paulo -3:06:28 - LMT 1914
1051 -3:00 Brazil -03/-02 1963 Oct 23 0:00
1052 -3:00 1:00 -02 1964
1053 -3:00 Brazil -03/-02
1054 #
1055 # Mato Grosso do Sul (MS)
1056 Zone America/Campo_Grande -3:38:28 - LMT 1914
1057 -4:00 Brazil -04/-03
1058 #
1059 # Mato Grosso (MT)
1060 Zone America/Cuiaba -3:44:20 - LMT 1914
1061 -4:00 Brazil -04/-03 2003 Sep 24
1062 -4:00 - -04 2004 Oct 1
1063 -4:00 Brazil -04/-03
1064 #
1065 # Rondônia (RO)
1066 Zone America/Porto_Velho -4:15:36 - LMT 1914
1067 -4:00 Brazil -04/-03 1988 Sep 12
1068 -4:00 - -04
1069 #
1070 # Roraima (RR)
1071 Zone America/Boa_Vista -4:02:40 - LMT 1914
1072 -4:00 Brazil -04/-03 1988 Sep 12
1073 -4:00 - -04 1999 Sep 30
1074 -4:00 Brazil -04/-03 2000 Oct 15
1075 -4:00 - -04
1076 #
1077 # east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto
1078 # The great circle line from Tabatinga to Porto Acre divides
1079 # east from west Amazonas.
1080 Zone America/Manaus -4:00:04 - LMT 1914
1081 -4:00 Brazil -04/-03 1988 Sep 12
1082 -4:00 - -04 1993 Sep 28
1083 -4:00 Brazil -04/-03 1994 Sep 22
1084 -4:00 - -04
1085 #
1086 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
1087 # Eirunepé, Envira, Ipixuna
1088 Zone America/Eirunepe -4:39:28 - LMT 1914
1089 -5:00 Brazil -05/-04 1988 Sep 12
1090 -5:00 - -05 1993 Sep 28
1091 -5:00 Brazil -05/-04 1994 Sep 22
1092 -5:00 - -05 2008 Jun 24 0:00
1093 -4:00 - -04 2013 Nov 10
1094 -5:00 - -05
1095 #
1096 # Acre (AC)
1097 Zone America/Rio_Branco -4:31:12 - LMT 1914
1098 -5:00 Brazil -05/-04 1988 Sep 12
1099 -5:00 - -05 2008 Jun 24 0:00
1100 -4:00 - -04 2013 Nov 10
1101 -5:00 - -05
1102
1103 # Chile
1104
1105 # From Paul Eggert (2015-04-03):
1106 # Shanks & Pottenger says America/Santiago introduced standard time in
1107 # 1890 and rounds its UT offset to 70W40; guess that in practice this
1108 # was the same offset as in 1916-1919. It also says Pacific/Easter
1109 # standardized on 109W22 in 1890; assume this didn't change the clocks.
1110 #
1111 # Dates for America/Santiago from 1910 to 2004 are primarily from
1112 # the following source, cited by Oscar van Vlijmen (2006-10-08):
1113 # [1] Chile Law
1114 # http://www.webexhibits.org/daylightsaving/chile.html
1115 # This contains a copy of this official table:
1116 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
1117 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
1118 # [1] needs several corrections, though.
1119 #
1120 # The first set of corrections is from:
1121 # [2] History of the Official Time of Chile
1122 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
1123 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
1124 # This is an English translation of:
1125 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
1126 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
1127 # A fancier Spanish version (requiring mouse-clicking) is at:
1128 # http://www.horaoficial.cl/historia_hora.html
1129 # Conflicts between [1] and [2] were resolved as follows:
1130 #
1131 # - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites
1132 # Boletín No. 1, Aviso No. 1 (1910). Go with [2].
1133 #
1134 # - [1] says SMT was -4:42:45, [2] says Chile's official time from
1135 # 1916 to 1919 was -4:42:46.3, the meridian of Chile's National
1136 # Astronomical Observatory (OAN), then located in what is now
1137 # Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46.
1138 #
1139 # - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites
1140 # Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2].
1141 #
1142 # - [1] does not give times for transitions; assume they occur
1143 # at midnight mainland time, the current common practice. However,
1144 # go with [2]'s specification of 23:00 for the 1947-05-21 transition.
1145 #
1146 # Another correction to [1] is from Jesper Nørgaard Welen, who
1147 # wrote (2006-10-08), "I think that there are some obvious mistakes in
1148 # the suggested link from Oscar van Vlijmen,... for instance entry 66
1149 # says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at
1150 # 1990-09-15 (they should have been 1990-09-15 and 1990-09-16
1151 # respectively), but anyhow it clears up some doubts too."
1152 #
1153 # Data for Pacific/Easter from 1910 through 1967 come from Shanks &
1154 # Pottenger. After that, for lack of better info assume
1155 # Pacific/Easter is always two hours behind America/Santiago;
1156 # this is known to work for DST transitions starting in 2008 and
1157 # may well be true for earlier transitions.
1158
1159 # From Eduardo Krell (1995-10-19):
1160 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
1161 # of October.... The law is the same for March and October.
1162 # (1998-09-29):
1163 # Because of the drought this year, the government decided to go into
1164 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
1165 # (unless there's another dry season next year, I guess).
1166
1167 # From Julio I. Pacheco Troncoso (1999-03-18):
1168 # Because of the same drought, the government decided to end DST later,
1169 # on April 3, (one-time change).
1170
1171 # From Germán Poo-Caamaño (2008-03-03):
1172 # Due to drought, Chile extends Daylight Time in three weeks. This
1173 # is one-time change (Saturday 3/29 at 24:00 for America/Santiago
1174 # and Saturday 3/29 at 22:00 for Pacific/Easter)
1175 # The Supreme Decree is located at
1176 # http://www.shoa.cl/servicios/supremo316.pdf
1177 #
1178 # From José Miguel Garrido (2008-03-05):
1179 # http://www.shoa.cl/noticias/2008/04hora/hora.htm
1180
1181 # From Angel Chiang (2010-03-04):
1182 # Subject: DST in Chile exceptionally extended to 3 April due to earthquake
1183 # http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098
1184 #
1185 # From Arthur David Olson (2010-03-06):
1186 # Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.
1187
1188 # From Glenn Eychaner (2011-03-28):
1189 # http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}
1190 # In English:
1191 # Chile's clocks will go back an hour this year on the 7th of May instead
1192 # of this Saturday. They will go forward again the 3rd Saturday in
1193 # August, not in October as they have since 1968.
1194
1195 # From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23):
1196 # As stated in the website of the Chilean Energy Ministry
1197 # http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html
1198 # The Chilean Government has decided to postpone the entrance into winter time
1199 # (to leave DST) from March 11 2012 to April 28th 2012....
1200 # Quote from the website communication:
1201 #
1202 # 6. For the year 2012, the dates of entry into winter time will be as follows:
1203 # a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at
1204 # 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00
1205 # of the same day.
1206 # b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is,
1207 # at 23:59:59, instead of passing to 0:00, the time should be adjusted to be
1208 # 01:00 on September 2.
1209
1210 # From Steffen Thorsen (2013-02-15):
1211 # According to several news sources, Chile has extended DST this year,
1212 # they will end DST later and start DST earlier than planned. They
1213 # hope to save energy. The new end date is 2013-04-28 00:00 and new
1214 # start date is 2013-09-08 00:00....
1215 # http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm
1216
1217 # From José Miguel Garrido (2014-02-19):
1218 # Today appeared in the Diario Oficial a decree amending the time change
1219 # dates to 2014.
1220 # DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC)
1221 # DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC)
1222 # http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf
1223
1224 # From Eduardo Romero Urra (2015-03-03):
1225 # Today has been published officially that Chile will use the DST time
1226 # permanently until March 25 of 2017
1227 # http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg
1228 #
1229 # From Paul Eggert (2015-03-03):
1230 # For now, assume that the extension will persist indefinitely.
1231
1232 # From Juan Correa (2016-03-18):
1233 # The decree regarding DST has been published in today's Official Gazette:
1234 # http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/
1235 # http://www.leychile.cl/Navegar?idNorma=1088502
1236 # It does consider the second Saturday of May and August as the dates
1237 # for the transition; and it lists DST dates until 2019, but I think
1238 # this scheme will stick.
1239 #
1240 # From Paul Eggert (2016-03-18):
1241 # For now, assume the pattern holds for the indefinite future.
1242 # The decree says transitions occur at 24:00; in practice this appears
1243 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
1244 # Island is always two hours behind the mainland.
1245
1246 # From Juan Correa (2016-12-04):
1247 # Magallanes region ... will keep DST (UTC -3) all year round....
1248 # 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
1249 #
1250 # From Deborah Goldsmith (2017-01-19):
1251 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
1252 # From Paul Eggert (2017-01-19):
1253 # The above says the Magallanes change expires 2019-05-11 at 24:00,
1254 # so in theory, they will revert to -04/-03 after that, which means
1255 # they will switch from -03 to -04 one hour after Santiago does that day.
1256 # For now, assume that they will not revert.
1257
1258 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1259 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
1260 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1261 Rule Chile 1968 only - Nov 3 4:00u 1:00 S
1262 Rule Chile 1969 only - Mar 30 3:00u 0 -
1263 Rule Chile 1969 only - Nov 23 4:00u 1:00 S
1264 Rule Chile 1970 only - Mar 29 3:00u 0 -
1265 Rule Chile 1971 only - Mar 14 3:00u 0 -
1266 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S
1267 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1268 Rule Chile 1973 only - Sep 30 4:00u 1:00 S
1269 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S
1270 Rule Chile 1987 only - Apr 12 3:00u 0 -
1271 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1272 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 S
1273 Rule Chile 1990 only - Sep 16 4:00u 1:00 S
1274 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1275 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S
1276 Rule Chile 1997 only - Mar 30 3:00u 0 -
1277 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1278 Rule Chile 1998 only - Sep 27 4:00u 1:00 S
1279 Rule Chile 1999 only - Apr 4 3:00u 0 -
1280 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 S
1281 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1282 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1283 # which is used below in specifying the transition.
1284 Rule Chile 2008 only - Mar 30 3:00u 0 -
1285 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1286 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1287 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1288 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 S
1289 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
1290 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 S
1291 Rule Chile 2016 max - May Sun>=9 3:00u 0 -
1292 Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 S
1293 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1294 # (1996-09) says 1998-03-08. Ignore these.
1295 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1296 Zone America/Santiago -4:42:46 - LMT 1890
1297 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1298 -5:00 - -05 1916 Jul 1
1299 -4:42:46 - SMT 1918 Sep 10
1300 -4:00 - -04 1919 Jul 1
1301 -4:42:46 - SMT 1927 Sep 1
1302 -5:00 Chile -05/-04 1932 Sep 1
1303 -4:00 - -04 1942 Jun 1
1304 -5:00 - -05 1942 Aug 1
1305 -4:00 - -04 1946 Jul 15
1306 -4:00 1:00 -03 1946 Sep 1 # central Chile
1307 -4:00 - -04 1947 Apr 1
1308 -5:00 - -05 1947 May 21 23:00
1309 -4:00 Chile -04/-03
1310 Zone America/Punta_Arenas -4:43:40 - LMT 1890
1311 -4:42:46 - SMT 1910 Jan 10
1312 -5:00 - -05 1916 Jul 1
1313 -4:42:46 - SMT 1918 Sep 10
1314 -4:00 - -04 1919 Jul 1
1315 -4:42:46 - SMT 1927 Sep 1
1316 -5:00 Chile -05/-04 1932 Sep 1
1317 -4:00 - -04 1942 Jun 1
1318 -5:00 - -05 1942 Aug 1
1319 -4:00 - -04 1947 Apr 1
1320 -5:00 - -05 1947 May 21 23:00
1321 -4:00 Chile -04/-03 2016 Dec 4
1322 -3:00 - -03
1323 Zone Pacific/Easter -7:17:28 - LMT 1890
1324 -7:17:28 - EMT 1932 Sep # Easter Mean Time
1325 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time
1326 -6:00 Chile -06/-05
1327 #
1328 # Salas y Gómez Island is uninhabited.
1329 # Other Chilean locations, including Juan Fernández Is, Desventuradas Is,
1330 # and Antarctic bases, are like America/Santiago.
1331
1332 # Antarctic base using South American rules
1333 # (See the file 'antarctica' for more.)
1334 #
1335 # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968)
1336 #
1337 # From Ethan Dicks (1996-10-06):
1338 # It keeps the same time as Punta Arenas, Chile, because, just like us
1339 # and the South Pole, that's the other end of their supply line....
1340 # I verified with someone who was there that since 1980,
1341 # Palmer has followed Chile. Prior to that, before the Falklands War,
1342 # Palmer used to be supplied from Argentina.
1343 #
1344 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1345 Zone Antarctica/Palmer 0 - -00 1965
1346 -4:00 Arg -04/-03 1969 Oct 5
1347 -3:00 Arg -03/-02 1982 May
1348 -4:00 Chile -04/-03 2016 Dec 4
1349 -3:00 - -03
1350
1351 # Colombia
1352
1353 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1354 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1355
1356 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1357 Rule CO 1992 only - May 3 0:00 1:00 S
1358 Rule CO 1993 only - Apr 4 0:00 0 -
1359 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1360 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1361 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1362 -5:00 CO -05/-04
1363 # Malpelo, Providencia, San Andres
1364 # no information; probably like America/Bogota
1365
1366 # Curaçao
1367
1368 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1369 #
1370 # From Paul Eggert (2006-03-22):
1371 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1372 # -4:00 since standard time was introduced on 1912-03-02; and that
1373 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1374 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1375 # Saba Island has been like Curaçao.
1376 # This all predates our 1970 cutoff, though.
1377 #
1378 # By July 2007 Curaçao and St Maarten are planned to become
1379 # associated states within the Netherlands, much like Aruba;
1380 # Bonaire, Saba and St Eustatius would become directly part of the
1381 # Netherlands as Kingdom Islands. This won't affect their time zones
1382 # though, as far as we know.
1383 #
1384 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1385 Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad
1386 -4:30 - -0430 1965
1387 -4:00 - AST
1388
1389 # From Arthur David Olson (2011-06-15):
1390 # use links for places with new iso3166 codes.
1391 # The name "Lower Prince's Quarter" is both longer than fourteen characters
1392 # and contains an apostrophe; use "Lower_Princes" below.
1393
1394 Link America/Curacao America/Lower_Princes # Sint Maarten
1395 Link America/Curacao America/Kralendijk # Caribbean Netherlands
1396
1397 # Ecuador
1398 #
1399 # Milne says the Central and South American Telegraph Company used -5:24:15.
1400 #
1401 # From Alois Treindl (2016-12-15):
1402 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
1403 # ... Whether the law applied also to Galápagos, I do not know.
1404 # From Paul Eggert (2016-12-15):
1405 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
1406 # This says President Sixto Durán Ballén signed decree No. 285, which
1407 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
1408 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did
1409 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
1410 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
1411 # sol" ("It was dawning in the middle of the night, the buses went to class
1412 # without sun"). Although Ballén's campaign slogan was "Ni un paso atrás"
1413 # (Not one step back), the clocks went back in 1993 and the experiment was not
1414 # repeated. For now, assume transitions were at 00:00 local time country-wide.
1415 #
1416 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1417 Rule Ecuador 1992 only - Nov 28 0:00 1:00 S
1418 Rule Ecuador 1993 only - Feb 5 0:00 0 -
1419 #
1420 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1421 Zone America/Guayaquil -5:19:20 - LMT 1890
1422 -5:14:00 - QMT 1931 # Quito Mean Time
1423 -5:00 Ecuador -05/-04
1424 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1425 -5:00 - -05 1986
1426 -6:00 Ecuador -06/-05
1427
1428 # Falklands
1429
1430 # From Paul Eggert (2006-03-22):
1431 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1432 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1433
1434 # From Falkland Islands Government Office, London (2001-01-22)
1435 # via Jesper Nørgaard:
1436 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1437 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1438 # September. It is anticipated that the clocks will revert back at 2
1439 # am on Sunday 21 April 2002 and advance to summer time at 2 am on
1440 # Sunday 1 September.
1441
1442 # From Rives McDow (2001-02-13):
1443 #
1444 # I have communicated several times with people there, and the last
1445 # time I had communications that was helpful was in 1998. Here is
1446 # what was said then:
1447 #
1448 # "The general rule was that Stanley used daylight saving and the Camp
1449 # did not. However for various reasons many people in the Camp have
1450 # started to use daylight saving (known locally as 'Stanley Time')
1451 # There is no rule as to who uses daylight saving - it is a matter of
1452 # personal choice and so it is impossible to draw a map showing who
1453 # uses it and who does not. Any list would be out of date as soon as
1454 # it was produced. This year daylight saving ended on April 18/19th
1455 # and started again on September 12/13th. I do not know what the rule
1456 # is, but can find out if you like. We do not change at the same time
1457 # as UK or Chile."
1458 #
1459 # I did have in my notes that the rule was "Second Saturday in Sep at
1460 # 0:00 until third Saturday in Apr at 0:00". I think that this does
1461 # not agree in some cases with Shanks; is this true?
1462 #
1463 # Also, there is no mention in the list that some areas in the
1464 # Falklands do not use DST. I have found in my communications there
1465 # that these areas are on the western half of East Falkland and all of
1466 # West Falkland. Stanley is the only place that consistently observes
1467 # DST. Again, as in other places in the world, the farmers don't like
1468 # it. West Falkland is almost entirely sheep farmers.
1469 #
1470 # I know one lady there that keeps a list of which farm keeps DST and
1471 # which doesn't each year. She runs a shop in Stanley, and says that
1472 # the list changes each year. She uses it to communicate to her
1473 # customers, catching them when they are home for lunch or dinner.
1474
1475 # From Paul Eggert (2001-03-05):
1476 # For now, we'll just record the time in Stanley, since we have no
1477 # better info.
1478
1479 # From Steffen Thorsen (2011-04-01):
1480 # The Falkland Islands will not turn back clocks this winter, but stay on
1481 # daylight saving time.
1482 #
1483 # One source:
1484 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3
1485 #
1486 # We have gotten this confirmed by a clerk of the legislative assembly:
1487 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1488 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1489 # hours) on the first Sunday of September at 0200hrs.
1490 #
1491 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1492 # will not revert to local mean time, but clocks will remain on Summer
1493 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1494 # change to local time following the trial period will be notified.
1495 #
1496 # From Andrew Newman (2012-02-24)
1497 # A letter from Justin McPhee, Chief Executive,
1498 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1499 # states...
1500 # The current Atlantic/Stanley entry under South America expects the
1501 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1502 # The database entry states that in 2011 Stanley was staying on fixed
1503 # summer time on a trial basis only. FIG need to contact IANA and/or
1504 # the maintainers of the database to inform them we're adopting
1505 # the same policy this year and suggest recommendations for future years.
1506 #
1507 # For now we will assume permanent summer time for the Falklands
1508 # until advised differently (to apply for 2012 and beyond, after the 2011
1509 # experiment was apparently successful.)
1510 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1511 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
1512 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1513 Rule Falk 1939 only - Oct 1 0:00 1:00 S
1514 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
1515 Rule Falk 1943 only - Jan 1 0:00 0 -
1516 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
1517 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1518 Rule Falk 1984 only - Sep 16 0:00 1:00 S
1519 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
1520 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1521 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1522 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 S
1523 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1524 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1525 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1526 -4:00 Falk -04/-03 1983 May
1527 -3:00 Falk -03/-02 1985 Sep 15
1528 -4:00 Falk -04/-03 2010 Sep 5 2:00
1529 -3:00 - -03
1530
1531 # French Guiana
1532 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1533 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1534 -4:00 - -04 1967 Oct
1535 -3:00 - -03
1536
1537 # Guyana
1538 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1539 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1540 -3:45 - -0345 1975 Jul 31
1541 -3:00 - -03 1991
1542 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1543 -4:00 - -04
1544
1545 # Paraguay
1546 #
1547 # From Paul Eggert (2006-03-22):
1548 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1549 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1550 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1551 #
1552 # From Waldemar Villamayor-Venialbo (2013-09-20):
1553 # No time of the day is established for the adjustment, so people normally
1554 # adjust their clocks at 0 hour of the given dates.
1555 #
1556 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1557 Rule Para 1975 1988 - Oct 1 0:00 1:00 S
1558 Rule Para 1975 1978 - Mar 1 0:00 0 -
1559 Rule Para 1979 1991 - Apr 1 0:00 0 -
1560 Rule Para 1989 only - Oct 22 0:00 1:00 S
1561 Rule Para 1990 only - Oct 1 0:00 1:00 S
1562 Rule Para 1991 only - Oct 6 0:00 1:00 S
1563 Rule Para 1992 only - Mar 1 0:00 0 -
1564 Rule Para 1992 only - Oct 5 0:00 1:00 S
1565 Rule Para 1993 only - Mar 31 0:00 0 -
1566 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
1567 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1568 Rule Para 1996 only - Mar 1 0:00 0 -
1569 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1570 # From Steffen Thorsen (2000-10-02):
1571 # I have three independent reports that Paraguay changed to DST this Sunday
1572 # (10-01).
1573 #
1574 # Translated by Gwillim Law (2001-02-27) from
1575 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1576 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1577 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1578 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1579 # system has been operating for several years. Formerly there was a separate
1580 # decree each year; the new law has the same effect, but permanently. Every
1581 # year, the time will change on the first Sunday of October; likewise, the
1582 # clock will be set back on the first Sunday of March.
1583 #
1584 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
1585 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1586 Rule Para 1997 only - Feb lastSun 0:00 0 -
1587 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1588 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1589 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1590 # From Rives McDow (2002-02-28):
1591 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
1592 # dst method to be from the first Sunday in September to the first Sunday in
1593 # April.
1594 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1595 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
1596 #
1597 # From Jesper Nørgaard Welen (2005-01-02):
1598 # There are several sources that claim that Paraguay made
1599 # a timezone rule change in autumn 2004.
1600 # From Steffen Thorsen (2005-01-05):
1601 # Decree 1,867 (2004-03-05)
1602 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1603 # http://www.presidencia.gov.py/decretos/D1867.pdf
1604 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 S
1605 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1606 # From Carlos Raúl Perasso (2010-02-18):
1607 # By decree number 3958 issued yesterday
1608 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1609 # Paraguay changes its DST schedule, postponing the March rule to April and
1610 # modifying the October date. The decree reads:
1611 # ...
1612 # Art. 1. It is hereby established that from the second Sunday of the month of
1613 # April of this year (2010), the official time is to be set back 60 minutes,
1614 # and that on the first Sunday of the month of October, it is to be set
1615 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1616 # ...
1617 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 S
1618 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1619 #
1620 # From Steffen Thorsen (2013-03-07):
1621 # Paraguay will end DST on 2013-03-24 00:00....
1622 # http://www.ande.gov.py/interna.php?id=1075
1623 #
1624 # From Carlos Raúl Perasso (2013-03-15):
1625 # The change in Paraguay is now final. Decree number 10780
1626 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1627 # From Carlos Raúl Perasso (2014-02-28):
1628 # Decree 1264 can be found at:
1629 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1630 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1631
1632 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1633 Zone America/Asuncion -3:50:40 - LMT 1890
1634 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1635 -4:00 - -04 1972 Oct
1636 -3:00 - -03 1974 Apr
1637 -4:00 Para -04/-03
1638
1639 # Peru
1640 #
1641 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1642 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1643 # When we were in Peru in 1985-1986, they apparently switched over
1644 # sometime between December 29 and January 3 while we were on the Amazon.
1645 #
1646 # From Paul Eggert (2006-03-22):
1647 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1648
1649 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1650 Rule Peru 1938 only - Jan 1 0:00 1:00 S
1651 Rule Peru 1938 only - Apr 1 0:00 0 -
1652 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
1653 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1654 Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
1655 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1656 Rule Peru 1990 only - Jan 1 0:00 1:00 S
1657 Rule Peru 1990 only - Apr 1 0:00 0 -
1658 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1659 Rule Peru 1994 only - Jan 1 0:00 1:00 S
1660 Rule Peru 1994 only - Apr 1 0:00 0 -
1661 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1662 Zone America/Lima -5:08:12 - LMT 1890
1663 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1664 -5:00 Peru -05/-04
1665
1666 # South Georgia
1667 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1668 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1669 -2:00 - -02
1670
1671 # South Sandwich Is
1672 # uninhabited; scientific personnel have wintered
1673
1674 # Suriname
1675 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1676 Zone America/Paramaribo -3:40:40 - LMT 1911
1677 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1678 -3:40:36 - PMT 1945 Oct # The capital moved?
1679 -3:30 - -0330 1984 Oct
1680 -3:00 - -03
1681
1682 # Trinidad and Tobago
1683 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1684 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
1685 -4:00 - AST
1686
1687 # These all agree with Trinidad and Tobago since 1970.
1688 Link America/Port_of_Spain America/Anguilla
1689 Link America/Port_of_Spain America/Antigua
1690 Link America/Port_of_Spain America/Dominica
1691 Link America/Port_of_Spain America/Grenada
1692 Link America/Port_of_Spain America/Guadeloupe
1693 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1694 Link America/Port_of_Spain America/Montserrat
1695 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1696 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1697 Link America/Port_of_Spain America/St_Lucia
1698 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1699 Link America/Port_of_Spain America/St_Vincent
1700 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1701
1702 # Uruguay
1703 # From Paul Eggert (1993-11-18):
1704 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1705 # From Shanks & Pottenger:
1706 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1707 # Whitman gives 1923 Oct 1; go with Shanks & Pottenger.
1708 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1709 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1710 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1711 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1712 # Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman.
1713 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1714 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1715 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1716 # Whitman gives 1937 Oct 3; go with Shanks & Pottenger.
1717 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1718 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1719 # and 1943 Apr 13 "to present time"; go with Shanks & Pottenger.
1720 Rule Uruguay 1941 only - Aug 1 0:00 0:30 HS
1721 Rule Uruguay 1942 only - Jan 1 0:00 0 -
1722 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1723 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1724 Rule Uruguay 1959 only - May 24 0:00 1:00 S
1725 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1726 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1727 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1728 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1729 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1730 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1731 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1732 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1733 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1734 Rule Uruguay 1972 only - Aug 15 0:00 0 -
1735 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1736 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1737 Rule Uruguay 1976 only - Oct 1 0:00 0 -
1738 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1739 Rule Uruguay 1978 only - Apr 1 0:00 0 -
1740 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1741 Rule Uruguay 1980 only - May 1 0:00 0 -
1742 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1743 Rule Uruguay 1988 only - Mar 14 0:00 0 -
1744 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1745 Rule Uruguay 1989 only - Mar 12 0:00 0 -
1746 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1747 # Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2,
1748 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1749 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1750 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1751 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1752 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1753 # From Eduardo Cota (2004-09-20):
1754 # The Uruguayan government has decreed a change in the local time....
1755 # http://www.presidencia.gub.uy/decretos/2004091502.htm
1756 Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1757 # From Steffen Thorsen (2005-03-11):
1758 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1759 # save energy ... it was postponed two weeks....
1760 # http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1761 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1762 # From Eduardo Cota (2005-09-27):
1763 # http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1764 # This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1765 # 02:00 local time, official time in Uruguay will be at GMT -2.
1766 Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1767 Rule Uruguay 2006 only - Mar 12 2:00 0 -
1768 # From Jesper Nørgaard Welen (2006-09-06):
1769 # http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF
1770 #
1771 # From Steffen Thorsen (2015-06-30):
1772 # ... it looks like they will not be using DST the coming summer:
1773 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
1774 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
1775 # From Paul Eggert (2015-06-30):
1776 # Apparently restaurateurs complained that DST caused people to go to the beach
1777 # instead of out to dinner.
1778 # From Pablo Camargo (2015-07-13):
1779 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
1780 # [dated 2015-06-29; repeals Decree 311/006 dated 2006-09-04]
1781 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 S
1782 Rule Uruguay 2007 2015 - Mar Sun>=8 2:00 0 -
1783
1784 # This Zone can be simplified once we assume zic %z.
1785 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1786 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1787 -3:30 Uruguay -0330/-03 1942 Dec 14
1788 -3:00 Uruguay -03/-02 1968
1789 -3:00 Uruguay -03/-0230 1971
1790 -3:00 Uruguay -03/-02 1974
1791 -3:00 Uruguay -03/-0230 1974 Dec 22
1792 -3:00 Uruguay -03/-02
1793
1794 # Venezuela
1795 #
1796 # From Paul Eggert (2015-07-28):
1797 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
1798 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
1799 #
1800 # From John Stainforth (2007-11-28):
1801 # ... the change for Venezuela originally expected for 2007-12-31 has
1802 # been brought forward to 2007-12-09. The official announcement was
1803 # published today in the "Gaceta Oficial de la República Bolivariana
1804 # de Venezuela, número 38.819" (official document for all laws or
1805 # resolution publication)
1806 # http://www.globovision.com/news.php?nid=72208
1807
1808 # From Alexander Krivenyshev (2016-04-15):
1809 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
1810 #
1811 # From Paul Eggert (2016-04-15):
1812 # Clocks advance 30 minutes on 2016-05-01 at 02:30....
1813 # "'Venezuela's new time-zone: hours without light, hours without water,
1814 # hours of presidential broadcasts, hours of lines,' quipped comedian
1815 # Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps
1816 # half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400
1817 # https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE
1818 #
1819 # From Matt Johnson (2016-04-20):
1820 # ... published in the official Gazette [2016-04-18], here:
1821 # http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf
1822
1823 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1824 Zone America/Caracas -4:27:44 - LMT 1890
1825 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1826 -4:30 - -0430 1965 Jan 1 0:00
1827 -4:00 - -04 2007 Dec 9 3:00
1828 -4:30 - -0430 2016 May 1 2:30
1829 -4:00 - -04