1 #
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 # tzdb data for South America and environs
25
26 # This file is in the public domain, so clarified as of
27 # 2009-05-17 by Arthur David Olson.
28
29 # This file is by no means authoritative; if you think you know better,
30 # go ahead and edit the file (and please send any changes to
31 # tz@iana.org for general use in the future). For more, please see
32 # the file CONTRIBUTING in the tz distribution.
33
34 # From Paul Eggert (2016-12-05):
35 #
36 # Unless otherwise specified, the source for data through 1990 is:
37 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
38 # San Diego: ACS Publications, Inc. (2003).
39 # Unfortunately this book contains many errors and cites no sources.
40 #
41 # Many years ago Gwillim Law wrote that a good source
42 # for time zone data was the International Air Transport
43 # Association's Standard Schedules Information Manual (IATA SSIM),
44 # published semiannually. Law sent in several helpful summaries
45 # of the IATA's data after 1990. Except where otherwise noted,
46 # IATA SSIM is the source for entries after 1990.
47 #
48 # For data circa 1899, a common source is:
49 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
50 # https://www.jstor.org/stable/1774359
51 #
52 # These tables use numeric abbreviations like -03 and -0330 for
53 # integer hour and minute UT offsets. Although earlier editions used
54 # alphabetic time zone abbreviations, these abbreviations were
55 # invented and did not reflect common practice.
56
57 ###############################################################################
58
59 ###############################################################################
60
61 # Argentina
62
63 # From Bob Devine (1988-01-28):
64 # Argentina: first Sunday in October to first Sunday in April since 1976.
65 # Double Summer time from 1969 to 1974. Switches at midnight.
66
67 # From U. S. Naval Observatory (1988-01-19):
68 # ARGENTINA 3 H BEHIND UTC
69
70 # From Hernan G. Otero (1995-06-26):
71 # I am sending modifications to the Argentine time zone table...
72 # AR was chosen because they are the ISO letters that represent Argentina.
73
74 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
75 Rule Arg 1930 only - Dec 1 0:00 1:00 -
76 Rule Arg 1931 only - Apr 1 0:00 0 -
77 Rule Arg 1931 only - Oct 15 0:00 1:00 -
78 Rule Arg 1932 1940 - Mar 1 0:00 0 -
79 Rule Arg 1932 1939 - Nov 1 0:00 1:00 -
80 Rule Arg 1940 only - Jul 1 0:00 1:00 -
81 Rule Arg 1941 only - Jun 15 0:00 0 -
82 Rule Arg 1941 only - Oct 15 0:00 1:00 -
83 Rule Arg 1943 only - Aug 1 0:00 0 -
84 Rule Arg 1943 only - Oct 15 0:00 1:00 -
85 Rule Arg 1946 only - Mar 1 0:00 0 -
86 Rule Arg 1946 only - Oct 1 0:00 1:00 -
87 Rule Arg 1963 only - Oct 1 0:00 0 -
88 Rule Arg 1963 only - Dec 15 0:00 1:00 -
89 Rule Arg 1964 1966 - Mar 1 0:00 0 -
90 Rule Arg 1964 1966 - Oct 15 0:00 1:00 -
91 Rule Arg 1967 only - Apr 2 0:00 0 -
92 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 -
93 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
94 Rule Arg 1974 only - Jan 23 0:00 1:00 -
95 Rule Arg 1974 only - May 1 0:00 0 -
96 Rule Arg 1988 only - Dec 1 0:00 1:00 -
97 #
98 # From Hernan G. Otero (1995-06-26):
99 # These corrections were contributed by InterSoft Argentina S.A.,
100 # obtaining the data from the:
101 # Talleres de Hidrografía Naval Argentina
102 # (Argentine Naval Hydrography Institute)
103 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
104 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 -
105 #
106 # From Hernan G. Otero (1995-06-26):
107 # From this moment on, the law that mandated the daylight saving
108 # time corrections was derogated and no more modifications
109 # to the time zones (for daylight saving) are now made.
110 #
111 # From Rives McDow (2000-01-10):
112 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
113 # which did not result in the switch of a time zone, as they stayed 9 hours
114 # from the International Date Line.
115 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 -
116 # From Paul Eggert (2007-12-28):
117 # DST was set to expire on March 5, not March 3, but since it was converted
118 # to standard time on March 3 it's more convenient for us to pretend that
119 # it ended on March 3.
120 Rule Arg 2000 only - Mar 3 0:00 0 -
121 #
122 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
123 # We just checked with our São Paulo office and they say the government of
124 # Argentina decided not to become one of the countries that go on or off DST.
125 # So Buenos Aires should be -3 hours from GMT at all times.
126 #
127 # From Fabián L. Arce Jofré (2000-04-04):
128 # The law that claimed DST for Argentina was derogated by President Fernando
129 # de la Rúa on March 2, 2000, because it would make people spend more energy
130 # in the winter time, rather than less. The change took effect on March 3.
131 #
132 # From Mariano Absatz (2001-06-06):
133 # one of the major newspapers here in Argentina said that the 1999
134 # Timezone Law (which never was effectively applied) will (would?) be
135 # in effect.... The article is at
136 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm
137 # ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted
138 # 1999-09-17, and published 1999-09-21. The official publication is at:
139 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
140 # Regretfully, you have to subscribe (and pay) for the on-line version....
141 #
142 # (2001-06-12):
143 # the timezone for Argentina will not change next Sunday.
144 # Apparently it will do so on Sunday 24th....
145 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm
146 #
147 # (2001-06-25):
148 # Last Friday (yes, the last working day before the date of the change), the
149 # Senate annulled the 1999 law that introduced the changes later postponed.
150 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
151 # It remains the vote of the Deputies..., but it will be the same....
152 # This kind of things had always been done this way in Argentina.
153 # We are still -03:00 all year round in all of the country.
154 #
155 # From Steffen Thorsen (2007-12-21):
156 # A user (Leonardo Chaim) reported that Argentina will adopt DST....
157 # all of the country (all Zone-entries) are affected. News reports like
158 # http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate
159 # that Argentina will use DST next year as well, from October to
160 # March, although exact rules are not given.
161 #
162 # From Jesper Nørgaard Welen (2007-12-26)
163 # The last hurdle of Argentina DST is over, the proposal was approved in
164 # the lower chamber too (Diputados) with a vote 192 for and 2 against.
165 # By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to
166 # the original scanned proposal, where the dates and the zero hours are
167 # clear and unambiguous...This is the article about final approval:
168 # http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996
169 #
170 # From Paul Eggert (2007-12-22):
171 # For dates after mid-2008, the following rules are my guesses and
172 # are quite possibly wrong, but are more likely than no DST at all.
173
174 # From Alexander Krivenyshev (2008-09-05):
175 # As per message from Carlos Alberto Fonseca Arauz (Nicaragua),
176 # Argentina will start DST on Sunday October 19, 2008.
177 #
178 # http://www.worldtimezone.com/dst_news/dst_news_argentina03.html
179 # http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)
180
181 # From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07)
182 # via Rodrigo Severo:
183 # Argentinian law No. 25.155 is no longer valid.
184 # http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm
185 # The new one is law No. 26.350
186 # http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm
187 # So there is no summer time in Argentina for now.
188
189 # From Mariano Absatz (2008-10-20):
190 # Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST
191 # in Argentina from 2008-10-19 until 2009-03-15.
192 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01
193 #
194
195 # Decree 1705/2008 excepting 12 Provinces from applying DST in the summer
196 # 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La
197 # Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego
198 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
199 #
200 # Press release 235 dated Saturday October 18th, from the Government of the
201 # Province of Jujuy saying it will not apply DST either (even when it was not
202 # included in Decree 1705/2008).
203 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
204
205 # From fullinet (2009-10-18):
206 # As announced in
207 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
208 # (an official .gob.ar) under title: "Sin Cambio de Hora"
209 # (English: "No hour change").
210 #
211 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
212 # oficial, decisión que estaba en estudio para su implementación el
213 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
214 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
215 # la modificación del huso horario, ya que 2009 nos encuentra con
216 # crecimiento en la producción y distribución energética."
217
218 Rule Arg 2007 only - Dec 30 0:00 1:00 -
219 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
220 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 -
221
222 # From Mariano Absatz (2004-05-21):
223 # Today it was officially published that the Province of Mendoza is changing
224 # its timezone this winter... starting tomorrow night....
225 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
226 # From Paul Eggert (2004-05-24):
227 # It's Law No. 7,210. This change is due to a public power emergency, so for
228 # now we'll assume it's for this year only.
229 #
230 # From Paul Eggert (2018-01-31):
231 # Hora de verano para la República Argentina
232 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
233 # says that standard time in Argentina from 1894-10-31
234 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
235 # over Shanks & Pottenger. It is upward compatible with Milne, who
236 # says Córdoba time was -4:16:48.2.
237
238 #
239 # From Mariano Absatz (2004-06-05):
240 # These media articles from a major newspaper mostly cover the current state:
241 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
242 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
243 #
244 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
245 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
246 # Apparently, all nine provinces would go back to UTC-03:00 at the same
247 # time in October 17th.
248 #
249 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
250 # Tierra del Fuego, Tucumán.
251 #
252 # From Mariano Absatz (2004-06-14):
253 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
254 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
255 # annoyance with the change is much higher than the power savings obtained....
256 #
257 # From Gwillim Law (2004-06-14):
258 # http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
259 # "The time change in Tierra del Fuego was a conflicted decision from
260 # the start. The government had decreed that the measure would take
261 # effect on June 1, but a normative error forced the new time to begin
262 # three days earlier, from a Saturday to a Sunday....
263 # Our understanding was that the change was originally scheduled to take place
264 # on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
265 # provinces). Sunday was May 30, only two days earlier. So the article
266 # contains a contradiction. I would give more credence to the Saturday/Sunday
267 # date than the "three days earlier" phrase, and conclude that Tierra del
268 # Fuego set its clocks back at 2004-05-30 00:00.
269 #
270 # From Steffen Thorsen (2004-10-05):
271 # The previous law 7210 which changed the province of Mendoza's time zone
272 # back in May have been modified slightly in a new law 7277, which set the
273 # new end date to 2004-09-26 (original date was 2004-10-17).
274 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
275 #
276 # From Mariano Absatz (2004-10-05):
277 # San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
278 # Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
279 # at midnight between Saturday, July 24th and Sunday, July 25th....
280 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html
281 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html
282 # http://www.sanjuan.gov.ar/prensa/archivo/000441.html
283
284 # From Alex Krivenyshev (2008-01-17):
285 # Here are articles that Argentina Province San Luis is planning to end DST
286 # as earlier as upcoming Monday January 21, 2008 or February 2008:
287 #
288 # Provincia argentina retrasa reloj y marca diferencia con resto del país
289 # (Argentine Province delayed clock and mark difference with the rest of the
290 # country)
291 # http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel
292 #
293 # Es inminente que en San Luis atrasen una hora los relojes
294 # (It is imminent in San Luis clocks one hour delay)
295 # https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html
296 # http://www.worldtimezone.com/dst_news/dst_news_argentina02.html
297
298 # From Jesper Nørgaard Welen (2008-01-18):
299 # The page of the San Luis provincial government
300 # http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812
301 # confirms what Alex Krivenyshev has earlier sent to the tz
302 # emailing list about that San Luis plans to return to standard
303 # time much earlier than the rest of the country. It also
304 # confirms that upon request the provinces San Juan and Mendoza
305 # refused to follow San Luis in this change.
306 #
307 # The change is supposed to take place Monday the 21st at 0:00
308 # hours. As far as I understand it if this goes ahead, we need
309 # a new timezone for San Luis (although there are also documented
310 # independent changes in the southamerica file of San Luis in
311 # 1990 and 1991 which has not been confirmed).
312
313 # From Jesper Nørgaard Welen (2008-01-25):
314 # Unfortunately the below page has become defunct, about the San Luis
315 # time change. Perhaps because it now is part of a group of pages "Most
316 # important pages of 2008."
317 #
318 # You can use
319 # http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834
320 # instead it seems. Or use "Buscador" from the main page of the San Luis
321 # government, and fill in "huso" and click OK, and you will get 3 pages
322 # from which the first one is identical to the above.
323
324 # From Mariano Absatz (2008-01-28):
325 # I can confirm that the Province of San Luis (and so far only that
326 # province) decided to go back to UTC-3 effective midnight Jan 20th 2008
327 # (that is, Monday 21st at 0:00 is the time the clocks were delayed back
328 # 1 hour), and they intend to keep UTC-3 as their timezone all year round
329 # (that is, unless they change their mind any minute now).
330 #
331 # So we'll have to add yet another city to 'southamerica' (I think San
332 # Luis city is the mos populated city in the Province, so it'd be
333 # America/Argentina/San_Luis... of course I can't remember if San Luis's
334 # history of particular changes goes along with Mendoza or San Juan :-(
335 # (I only remember not being able to collect hard facts about San Luis
336 # back in 2004, when these provinces changed to UTC-4 for a few days, I
337 # mailed them personally and never got an answer).
338
339 # From Paul Eggert (2014-08-12):
340 # Unless otherwise specified, data entries are from Shanks & Pottenger through
341 # 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that
342 # America/Cordoba split into 6 subregions during 1991/1992, one of which
343 # was America/San_Luis, but we haven't verified this yet so for now we'll
344 # keep America/Cordoba a single region rather than splitting it into the
345 # other 5 subregions.
346
347 # From Mariano Absatz (2009-03-13):
348 # Yesterday (with our usual 2-day notice) the Province of San Luis
349 # decided that next Sunday instead of "staying" @utc-03:00 they will go
350 # to utc-04:00 until the second Saturday in October...
351 #
352 # The press release is at
353 # http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
354 # (I couldn't find the decree, but www.sanluis.gov.ar
355 # is the official page for the Province Government.)
356 #
357 # There's also a note in only one of the major national papers ...
358 # http://www.lanacion.com.ar/nota.asp?nota_id=1107912
359 #
360 # The press release says [quick and dirty translation]:
361 # ... announced that next Sunday, at 00:00, Puntanos (the San Luis
362 # inhabitants) will have to turn back one hour their clocks
363 #
364 # Since then, San Luis will establish its own Province timezone. Thus,
365 # during 2009, this timezone change will run from 00:00 the third Sunday
366 # in March until 24:00 of the second Saturday in October.
367
368 # From Mariano Absatz (2009-10-16):
369 # ...the Province of San Luis is a case in itself.
370 #
371 # The Law at
372 # http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276
373 # is ambiguous because establishes a calendar from the 2nd Sunday in
374 # October at 0:00 thru the 2nd Saturday in March at 24:00 and the
375 # complement of that starting on the 2nd Sunday of March at 0:00 and
376 # ending on the 2nd Saturday of March at 24:00.
377 #
378 # This clearly breaks every time the 1st of March or October is a Sunday.
379 #
380 # IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd
381 # Sunday of October and March.
382 #
383 # The problem is that the changes in the rest of the Provinces that did
384 # change in 2007/2008, were made according to the Federal Law and Decrees
385 # that did so on the 3rd Sunday of October and March.
386 #
387 # In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday
388 # (October 11th) at 0:00.
389 #
390 # So I guess a new set of rules, besides "Arg", must be made and the last
391 # America/Argentina/San_Luis entries should change to use these...
392 # ...
393
394 # From Alexander Krivenyshev (2010-04-09):
395 # According to news reports from El Diario de la República Province San
396 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
397 # after April 11, 2010 - will continue to have same time as rest of
398 # Argentina (UTC-3) (no DST).
399 #
400 # Confirmaron la prórroga del huso horario de verano (Spanish)
401 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
402 # or (some English translation):
403 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
404
405 # From Mariano Absatz (2010-04-12):
406 # yes...I can confirm this...and given that San Luis keeps calling
407 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
408 # rules...San Luis is still using "Western ARgentina Time" and it got
409 # stuck on Summer daylight savings time even though the summer is over.
410
411 # From Paul Eggert (2018-01-23):
412 # Perhaps San Luis operates on the legal fiction that it is at -04
413 # with perpetual daylight saving time, but ordinary usage typically seems to
414 # just say it's at -03; see, for example,
415 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
416 # We've documented similar situations as being plain changes to
417 # standard time, so let's do that here too. This does not change UTC
418 # offsets, only tm_isdst and the time zone abbreviations. One minor
419 # plus is that this silences a zic complaint that there's no POSIX TZ
420 # setting for timestamps past 2038.
421
422 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
423 #
424 # Buenos Aires (BA), Capital Federal (CF),
425 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
426 -4:16:48 - CMT 1920 May # Córdoba Mean Time
427 -4:00 - -04 1930 Dec
428 -4:00 Arg -04/-03 1969 Oct 5
429 -3:00 Arg -03/-02 1999 Oct 3
430 -4:00 Arg -04/-03 2000 Mar 3
431 -3:00 Arg -03/-02
432 #
433 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
434 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
435 #
436 # Shanks & Pottenger also make the following claims, which we haven't verified:
437 # - Formosa switched to -3:00 on 1991-01-07.
438 # - Misiones switched to -3:00 on 1990-12-29.
439 # - Chaco switched to -3:00 on 1991-01-04.
440 # - Santiago del Estero switched to -4:00 on 1991-04-01,
441 # then to -3:00 on 1991-04-26.
442 #
443 Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31
444 -4:16:48 - CMT 1920 May
445 -4:00 - -04 1930 Dec
446 -4:00 Arg -04/-03 1969 Oct 5
447 -3:00 Arg -03/-02 1991 Mar 3
448 -4:00 - -04 1991 Oct 20
449 -3:00 Arg -03/-02 1999 Oct 3
450 -4:00 Arg -04/-03 2000 Mar 3
451 -3:00 Arg -03/-02
452 #
453 # Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN)
454 Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31
455 -4:16:48 - CMT 1920 May
456 -4:00 - -04 1930 Dec
457 -4:00 Arg -04/-03 1969 Oct 5
458 -3:00 Arg -03/-02 1991 Mar 3
459 -4:00 - -04 1991 Oct 20
460 -3:00 Arg -03/-02 1999 Oct 3
461 -4:00 Arg -04/-03 2000 Mar 3
462 -3:00 Arg -03/-02 2008 Oct 18
463 -3:00 - -03
464 #
465 # Tucumán (TM)
466 Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
467 -4:16:48 - CMT 1920 May
468 -4:00 - -04 1930 Dec
469 -4:00 Arg -04/-03 1969 Oct 5
470 -3:00 Arg -03/-02 1991 Mar 3
471 -4:00 - -04 1991 Oct 20
472 -3:00 Arg -03/-02 1999 Oct 3
473 -4:00 Arg -04/-03 2000 Mar 3
474 -3:00 - -03 2004 Jun 1
475 -4:00 - -04 2004 Jun 13
476 -3:00 Arg -03/-02
477 #
478 # La Rioja (LR)
479 Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
480 -4:16:48 - CMT 1920 May
481 -4:00 - -04 1930 Dec
482 -4:00 Arg -04/-03 1969 Oct 5
483 -3:00 Arg -03/-02 1991 Mar 1
484 -4:00 - -04 1991 May 7
485 -3:00 Arg -03/-02 1999 Oct 3
486 -4:00 Arg -04/-03 2000 Mar 3
487 -3:00 - -03 2004 Jun 1
488 -4:00 - -04 2004 Jun 20
489 -3:00 Arg -03/-02 2008 Oct 18
490 -3:00 - -03
491 #
492 # San Juan (SJ)
493 Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
494 -4:16:48 - CMT 1920 May
495 -4:00 - -04 1930 Dec
496 -4:00 Arg -04/-03 1969 Oct 5
497 -3:00 Arg -03/-02 1991 Mar 1
498 -4:00 - -04 1991 May 7
499 -3:00 Arg -03/-02 1999 Oct 3
500 -4:00 Arg -04/-03 2000 Mar 3
501 -3:00 - -03 2004 May 31
502 -4:00 - -04 2004 Jul 25
503 -3:00 Arg -03/-02 2008 Oct 18
504 -3:00 - -03
505 #
506 # Jujuy (JY)
507 Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
508 -4:16:48 - CMT 1920 May
509 -4:00 - -04 1930 Dec
510 -4:00 Arg -04/-03 1969 Oct 5
511 -3:00 Arg -03/-02 1990 Mar 4
512 -4:00 - -04 1990 Oct 28
513 -4:00 1:00 -03 1991 Mar 17
514 -4:00 - -04 1991 Oct 6
515 -3:00 1:00 -02 1992
516 -3:00 Arg -03/-02 1999 Oct 3
517 -4:00 Arg -04/-03 2000 Mar 3
518 -3:00 Arg -03/-02 2008 Oct 18
519 -3:00 - -03
520 #
521 # Catamarca (CT), Chubut (CH)
522 Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
523 -4:16:48 - CMT 1920 May
524 -4:00 - -04 1930 Dec
525 -4:00 Arg -04/-03 1969 Oct 5
526 -3:00 Arg -03/-02 1991 Mar 3
527 -4:00 - -04 1991 Oct 20
528 -3:00 Arg -03/-02 1999 Oct 3
529 -4:00 Arg -04/-03 2000 Mar 3
530 -3:00 - -03 2004 Jun 1
531 -4:00 - -04 2004 Jun 20
532 -3:00 Arg -03/-02 2008 Oct 18
533 -3:00 - -03
534 #
535 # Mendoza (MZ)
536 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
537 -4:16:48 - CMT 1920 May
538 -4:00 - -04 1930 Dec
539 -4:00 Arg -04/-03 1969 Oct 5
540 -3:00 Arg -03/-02 1990 Mar 4
541 -4:00 - -04 1990 Oct 15
542 -4:00 1:00 -03 1991 Mar 1
543 -4:00 - -04 1991 Oct 15
544 -4:00 1:00 -03 1992 Mar 1
545 -4:00 - -04 1992 Oct 18
546 -3:00 Arg -03/-02 1999 Oct 3
547 -4:00 Arg -04/-03 2000 Mar 3
548 -3:00 - -03 2004 May 23
549 -4:00 - -04 2004 Sep 26
550 -3:00 Arg -03/-02 2008 Oct 18
551 -3:00 - -03
552 #
553 # San Luis (SL)
554
555 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
556 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 -
557
558 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
559 -4:16:48 - CMT 1920 May
560 -4:00 - -04 1930 Dec
561 -4:00 Arg -04/-03 1969 Oct 5
562 -3:00 Arg -03/-02 1990
563 -3:00 1:00 -02 1990 Mar 14
564 -4:00 - -04 1990 Oct 15
565 -4:00 1:00 -03 1991 Mar 1
566 -4:00 - -04 1991 Jun 1
567 -3:00 - -03 1999 Oct 3
568 -4:00 1:00 -03 2000 Mar 3
569 -3:00 - -03 2004 May 31
570 -4:00 - -04 2004 Jul 25
571 -3:00 Arg -03/-02 2008 Jan 21
572 -4:00 SanLuis -04/-03 2009 Oct 11
573 -3:00 - -03
574 #
575 # Santa Cruz (SC)
576 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
577 -4:16:48 - CMT 1920 May
578 -4:00 - -04 1930 Dec
579 -4:00 Arg -04/-03 1969 Oct 5
580 -3:00 Arg -03/-02 1999 Oct 3
581 -4:00 Arg -04/-03 2000 Mar 3
582 -3:00 - -03 2004 Jun 1
583 -4:00 - -04 2004 Jun 20
584 -3:00 Arg -03/-02 2008 Oct 18
585 -3:00 - -03
586 #
587 # Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF)
588 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
589 -4:16:48 - CMT 1920 May
590 -4:00 - -04 1930 Dec
591 -4:00 Arg -04/-03 1969 Oct 5
592 -3:00 Arg -03/-02 1999 Oct 3
593 -4:00 Arg -04/-03 2000 Mar 3
594 -3:00 - -03 2004 May 30
595 -4:00 - -04 2004 Jun 20
596 -3:00 Arg -03/-02 2008 Oct 18
597 -3:00 - -03
598
599 # Aruba
600 Link America/Curacao America/Aruba
601
602 # Bolivia
603 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
604 Zone America/La_Paz -4:32:36 - LMT 1890
605 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
606 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST
607 -4:00 - -04
608
609 # Brazil
610
611 # From Paul Eggert (1993-11-18):
612 # The mayor of Rio recently attempted to change the time zone rules
613 # just in his city, in order to leave more summer time for the tourist trade.
614 # The rule change lasted only part of the day;
615 # the federal government refused to follow the city's rules, and business
616 # was in a chaos, so the mayor backed down that afternoon.
617
618 # From IATA SSIM (1996-02):
619 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
620 # Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ),
621 # Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO),
622 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
623 # [The last three states are new to this issue of the IATA SSIM.]
624
625 # From Gwillim Law (1996-10-07):
626 # Geography, history (Tocantins was part of Goiás until 1989), and other
627 # sources of time zone information lead me to believe that AL, SE, and TO were
628 # always in BR1, and so the only change was whether or not they observed DST....
629 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
630 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
631 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
632 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
633 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
634 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
635 # become part of the state of Pernambuco). The boundary between BR1 and BR2
636 # has never been clearly stated. They've simply been called East and West.
637 # However, some conclusions can be drawn from another IATA manual: the Airline
638 # Coding Directory, which lists close to 400 airports in Brazil. For each
639 # airport it gives a time zone which is coded to the SSIM. From that
640 # information, I'm led to conclude that the states of Amapá (AP), Ceará (CE),
641 # Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do
642 # Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST.
643
644 # From Marcos Tadeu (1998-09-27):
645 # Brazilian official page <http://pcdsh01.on.br/verao1.html>
646
647 # From Jesper Nørgaard (2000-11-03):
648 # [For an official list of which regions in Brazil use which time zones, see:]
649 # http://pcdsh01.on.br/Fusbr.htm
650 # http://pcdsh01.on.br/Fusbrhv.htm
651
652 # From Celso Doria via David Madeo (2002-10-09):
653 # The reason for the delay this year has to do with elections in Brazil.
654 #
655 # Unlike in the United States, elections in Brazil are 100% computerized and
656 # the results are known almost immediately. Yesterday, it was the first
657 # round of the elections when 115 million Brazilians voted for President,
658 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is
659 # counting (or re-counting) votes anymore and we know there will be a second
660 # round for the Presidency and also for some Governors. The 2nd round will
661 # take place on October 27th.
662 #
663 # The reason why the DST will only begin November 3rd is that the thousands
664 # of electoral machines used cannot have their time changed, and since the
665 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
666 # the Government decided to postpone DST, instead of changing the Constitution
667 # (maybe, for the next elections, it will be possible to change the clock)...
668
669 # From Rodrigo Severo (2004-10-04):
670 # It's just the biannual change made necessary by the much hyped, supposedly
671 # modern Brazilian eletronic voting machines which, apparently, can't deal
672 # with a time change between the first and the second rounds of the elections.
673
674 # From Steffen Thorsen (2007-09-20):
675 # Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00:
676 # http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975
677
678 # From Paul Schulze (2008-06-24):
679 # ...by law number 11.662 of April 24, 2008 (published in the "Diario
680 # Oficial da União"...) in Brazil there are changes in the timezones,
681 # effective today (00:00am at June 24, 2008) as follows:
682 #
683 # a) The timezone UTC+5 is extinguished, with all the Acre state and the
684 # part of the Amazonas state that had this timezone now being put to the
685 # timezone UTC+4
686 # b) The whole Pará state now is put at timezone UTC+3, instead of just
687 # part of it, as was before.
688 #
689 # This change follows a proposal of senator Tiao Viana of Acre state, that
690 # proposed it due to concerns about open television channels displaying
691 # programs inappropriate to youths in the states that had the timezone
692 # UTC+5 too early in the night. In the occasion, some more corrections
693 # were proposed, trying to unify the timezones of any given state. This
694 # change modifies timezone rules defined in decree 2.784 of 18 June,
695 # 1913.
696
697 # From Rodrigo Severo (2008-06-24):
698 # Just correcting the URL:
699 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008
700 #
701 # As a result of the above Decree I believe the America/Rio_Branco
702 # timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall
703 # be created to represent the...west side of the Pará State. I
704 # suggest this new timezone be called Santarem as the most
705 # important/populated city in the affected area.
706 #
707 # This new timezone would be the same as the Rio_Branco timezone up to
708 # the 2008/06/24 change which would be to UTC-3 instead of UTC-4.
709
710 # From Alex Krivenyshev (2008-06-24):
711 # This is a quick reference page for New and Old Brazil Time Zones map.
712 # http://www.worldtimezone.com/brazil-time-new-old.php
713 #
714 # - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05
715 # (state Acre and the part of the Amazonas will be UTC/GMT-04) - western
716 # part of Par state is moving to one timezone UTC-03 (from UTC-04).
717
718 # From Paul Eggert (2002-10-10):
719 # The official decrees referenced below are mostly taken from
720 # Decretos sobre o Horário de Verão no Brasil.
721 # http://pcdsh01.on.br/DecHV.html
722
723 # From Steffen Thorsen (2008-08-29):
724 # As announced by the government and many newspapers in Brazil late
725 # yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and
726 # it will end on 2009-02-15 (current rule for Brazil is fine). Based on
727 # past years experience with the elections, there was a good chance that
728 # the start was postponed to November, but it did not happen this year.
729 #
730 # It has not yet been posted to http://pcdsh01.on.br/DecHV.html
731 #
732 # An official page about it:
733 # http://www.mme.gov.br/site/news/detail.do?newsId=16722
734 # Note that this link does not always work directly, but must be accessed
735 # by going to
736 # http://www.mme.gov.br/first
737 #
738 # One example link that works directly:
739 # http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54
740 # (Portuguese)
741 #
742 # We have a written a short article about it as well:
743 # https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html
744 #
745 # From Alexander Krivenyshev (2011-10-04):
746 # State Bahia will return to Daylight savings time this year after 8 years off.
747 # The announcement was made by Governor Jaques Wagner in an interview to a
748 # television station in Salvador.
749
750 # In Portuguese:
751 # http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html
752 # https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html
753
754 # From Guilherme Bernardes Rodrigues (2011-10-07):
755 # There is news in the media, however there is still no decree about it.
756 # I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the
757 # official agency about time in Brazil, and she confirmed that the old rule is
758 # still in force.
759
760 # From Guilherme Bernardes Rodrigues (2011-10-14)
761 # It's official, the President signed a decree that includes Bahia in summer
762 # time.
763 # [ and in a second message (same day): ]
764 # I found the decree.
765 #
766 # DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011
767 # Link :
768 # http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6
769
770 # From Kelley Cook (2012-10-16):
771 # The governor of state of Bahia in Brazil announced on Thursday that
772 # due to public pressure, he is reversing the DST policy they implemented
773 # last year and will not be going to Summer Time on October 21st....
774 # http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia
775
776 # From Rodrigo Severo (2012-10-16):
777 # Tocantins state will have DST.
778 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
779
780 # From Steffen Thorsen (2013-09-20):
781 # Tocantins in Brazil is very likely not to observe DST from October....
782 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
783 # We will keep this article updated when this is confirmed:
784 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
785
786 # From Steffen Thorsen (2013-10-17):
787 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
788 # Senator Jorge Viana announced that Acre will change time zone on November 10.
789 # He did not specify the time of the change, nor if western parts of Amazonas
790 # will change as well.
791 #
792 # From Paul Eggert (2013-10-17):
793 # For now, assume western Amazonas will change as well.
794
795 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
796 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
797 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
798 Rule Brazil 1931 only - Oct 3 11:00 1:00 -
799 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
800 Rule Brazil 1932 only - Oct 3 0:00 1:00 -
801 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
802 # revoked DST.
803 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
804 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
805 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 -
806 Rule Brazil 1950 only - Apr 16 1:00 0 -
807 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
808 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
809 Rule Brazil 1953 only - Mar 1 0:00 0 -
810 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
811 # revoked DST.
812 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
813 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
814 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
815 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
816 # extended the above decree to all of the national territory on 12-09.
817 Rule Brazil 1963 only - Dec 9 0:00 1:00 -
818 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
819 # extended summer time by one day to 1964-03-01 00:00 (start of school).
820 Rule Brazil 1964 only - Mar 1 0:00 0 -
821 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
822 Rule Brazil 1965 only - Jan 31 0:00 1:00 -
823 Rule Brazil 1965 only - Mar 31 0:00 0 -
824 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
825 Rule Brazil 1965 only - Dec 1 0:00 1:00 -
826 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
827 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
828 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 -
829 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
830 # revoked DST.
831 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
832 Rule Brazil 1985 only - Nov 2 0:00 1:00 -
833 # Decree 92,310 (1986-01-21)
834 # Decree 92,463 (1986-03-13)
835 Rule Brazil 1986 only - Mar 15 0:00 0 -
836 # Decree 93,316 (1986-10-01)
837 Rule Brazil 1986 only - Oct 25 0:00 1:00 -
838 Rule Brazil 1987 only - Feb 14 0:00 0 -
839 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
840 Rule Brazil 1987 only - Oct 25 0:00 1:00 -
841 Rule Brazil 1988 only - Feb 7 0:00 0 -
842 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
843 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
844 Rule Brazil 1988 only - Oct 16 0:00 1:00 -
845 Rule Brazil 1989 only - Jan 29 0:00 0 -
846 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
847 # with the same exceptions
848 Rule Brazil 1989 only - Oct 15 0:00 1:00 -
849 Rule Brazil 1990 only - Feb 11 0:00 0 -
850 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
851 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
852 # Decree 99,629 (1990-10-19) adds BA, MT.
853 Rule Brazil 1990 only - Oct 21 0:00 1:00 -
854 Rule Brazil 1991 only - Feb 17 0:00 0 -
855 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
856 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
857 Rule Brazil 1991 only - Oct 20 0:00 1:00 -
858 Rule Brazil 1992 only - Feb 9 0:00 0 -
859 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
860 # adopted by same states.
861 Rule Brazil 1992 only - Oct 25 0:00 1:00 -
862 Rule Brazil 1993 only - Jan 31 0:00 0 -
863 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
864 # adopted by same states, plus AM.
865 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
866 # web page corrected 2004-01-07) adopted by same states, minus AM.
867 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
868 # adopted by same states, plus MT and TO.
869 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
870 # adds AL, SE.
871 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 -
872 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
873 Rule Brazil 1996 only - Feb 11 0:00 0 -
874 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
875 # adopted by same states, minus AL, SE.
876 Rule Brazil 1996 only - Oct 6 0:00 1:00 -
877 Rule Brazil 1997 only - Feb 16 0:00 0 -
878 # From Daniel C. Sobral (1998-02-12):
879 # In 1997, the DS began on October 6. The stated reason was that
880 # because international television networks ignored Brazil's policy on DS,
881 # they bought the wrong times on satellite for coverage of Pope's visit.
882 # This year, the ending date of DS was postponed to March 1
883 # to help dealing with the shortages of electric power.
884 #
885 # Decree 2,317 (1997-09-04), adopted by same states.
886 Rule Brazil 1997 only - Oct 6 0:00 1:00 -
887 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
888 # (1998-02-10)
889 Rule Brazil 1998 only - Mar 1 0:00 0 -
890 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
891 # adopted by the same states as before.
892 Rule Brazil 1998 only - Oct 11 0:00 1:00 -
893 Rule Brazil 1999 only - Feb 21 0:00 0 -
894 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
895 # (1999-08-23) adopted by same states.
896 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
897 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
898 Rule Brazil 1999 only - Oct 3 0:00 1:00 -
899 Rule Brazil 2000 only - Feb 27 0:00 0 -
900 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
901 # adopted by the same states as before.
902 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
903 # repeals DST in PE and RR, effective 2000-10-15 00:00.
904 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
905 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
906 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
907 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
908 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 -
909 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
910 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
911 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
912 Rule Brazil 2002 only - Nov 3 0:00 1:00 -
913 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
914 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
915 Rule Brazil 2003 only - Oct 19 0:00 1:00 -
916 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
917 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
918 Rule Brazil 2004 only - Nov 2 0:00 1:00 -
919 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
920 # adopted by the same states as before.
921 Rule Brazil 2005 only - Oct 16 0:00 1:00 -
922 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
923 # adopted by the same states as before.
924 Rule Brazil 2006 only - Nov 5 0:00 1:00 -
925 Rule Brazil 2007 only - Feb 25 0:00 0 -
926 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
927 # adopted by the same states as before.
928 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 -
929 # From Frederico A. C. Neves (2008-09-10):
930 # According to this decree
931 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
932 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
933 # 3rd Feb Sunday. There is an exception on the return date when this is
934 # the Carnival Sunday then the return date will be the next Sunday...
935 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 -
936 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
937 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
938 # added Bahia.
939 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
940 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
941 # removed Bahia and added Tocantins.
942 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
943 # removed Tocantins.
944 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
945 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
946 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
947 # From Steffen Thorsen (2017-12-18):
948 # According to many media sources, next year's DST start in Brazil will move to
949 # the first Sunday of November, and it will stay like that for the years after.
950 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
951 # From Steffen Thorsen (2017-12-20):
952 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
953 #
954 # From Fábio Gomes (2018-10-04):
955 # The Brazilian president just announced a new change on this year DST.
956 # It was scheduled to start on November 4th and it was changed to November 18th.
957 # From Rodrigo Brüning Wessler (2018-10-15):
958 # The Brazilian government just announced that the change in DST was
959 # canceled.... Maybe the president Michel Temer also woke up one hour
960 # earlier today. :)
961 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 -
962 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
963 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
964 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
965 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
966 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
967 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
968 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
969 # From Arthur David Olson (2008-09-29):
970 # The next is wrong in some years but is better than nothing.
971 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
972
973 # The latest ruleset listed above says that the following states observe DST:
974 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
975
976 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
977 #
978 # Fernando de Noronha (administratively part of PE)
979 Zone America/Noronha -2:09:40 - LMT 1914
980 -2:00 Brazil -02/-01 1990 Sep 17
981 -2:00 - -02 1999 Sep 30
982 -2:00 Brazil -02/-01 2000 Oct 15
983 -2:00 - -02 2001 Sep 13
984 -2:00 Brazil -02/-01 2002 Oct 1
985 -2:00 - -02
986 # Other Atlantic islands have no permanent settlement.
987 # These include Trindade and Martim Vaz (administratively part of ES),
988 # Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE).
989 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
990 # it also included the Penedos.
991 #
992 # Amapá (AP), east Pará (PA)
993 # East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu.
994 # The division between east and west Pará is the river Xingu.
995 # In the north a very small part from the river Javary (now Jari I guess,
996 # the border with Amapá) to the Amazon, then to the Xingu.
997 Zone America/Belem -3:13:56 - LMT 1914
998 -3:00 Brazil -03/-02 1988 Sep 12
999 -3:00 - -03
1000 #
1001 # west Pará (PA)
1002 # West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém.
1003 Zone America/Santarem -3:38:48 - LMT 1914
1004 -4:00 Brazil -04/-03 1988 Sep 12
1005 -4:00 - -04 2008 Jun 24 0:00
1006 -3:00 - -03
1007 #
1008 # Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN),
1009 # Paraíba (PB)
1010 Zone America/Fortaleza -2:34:00 - 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 22
1014 -3:00 - -03 2001 Sep 13
1015 -3:00 Brazil -03/-02 2002 Oct 1
1016 -3:00 - -03
1017 #
1018 # Pernambuco (PE) (except Atlantic islands)
1019 Zone America/Recife -2:19:36 - LMT 1914
1020 -3:00 Brazil -03/-02 1990 Sep 17
1021 -3:00 - -03 1999 Sep 30
1022 -3:00 Brazil -03/-02 2000 Oct 15
1023 -3:00 - -03 2001 Sep 13
1024 -3:00 Brazil -03/-02 2002 Oct 1
1025 -3:00 - -03
1026 #
1027 # Tocantins (TO)
1028 Zone America/Araguaina -3:12:48 - LMT 1914
1029 -3:00 Brazil -03/-02 1990 Sep 17
1030 -3:00 - -03 1995 Sep 14
1031 -3:00 Brazil -03/-02 2003 Sep 24
1032 -3:00 - -03 2012 Oct 21
1033 -3:00 Brazil -03/-02 2013 Sep
1034 -3:00 - -03
1035 #
1036 # Alagoas (AL), Sergipe (SE)
1037 Zone America/Maceio -2:22:52 - LMT 1914
1038 -3:00 Brazil -03/-02 1990 Sep 17
1039 -3:00 - -03 1995 Oct 13
1040 -3:00 Brazil -03/-02 1996 Sep 4
1041 -3:00 - -03 1999 Sep 30
1042 -3:00 Brazil -03/-02 2000 Oct 22
1043 -3:00 - -03 2001 Sep 13
1044 -3:00 Brazil -03/-02 2002 Oct 1
1045 -3:00 - -03
1046 #
1047 # Bahia (BA)
1048 # There are too many Salvadors elsewhere, so use America/Bahia instead
1049 # of America/Salvador.
1050 Zone America/Bahia -2:34:04 - LMT 1914
1051 -3:00 Brazil -03/-02 2003 Sep 24
1052 -3:00 - -03 2011 Oct 16
1053 -3:00 Brazil -03/-02 2012 Oct 21
1054 -3:00 - -03
1055 #
1056 # Goiás (GO), Distrito Federal (DF), Minas Gerais (MG),
1057 # Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR),
1058 # Santa Catarina (SC), Rio Grande do Sul (RS)
1059 Zone America/Sao_Paulo -3:06:28 - LMT 1914
1060 -3:00 Brazil -03/-02 1963 Oct 23 0:00
1061 -3:00 1:00 -02 1964
1062 -3:00 Brazil -03/-02
1063 #
1064 # Mato Grosso do Sul (MS)
1065 Zone America/Campo_Grande -3:38:28 - LMT 1914
1066 -4:00 Brazil -04/-03
1067 #
1068 # Mato Grosso (MT)
1069 Zone America/Cuiaba -3:44:20 - LMT 1914
1070 -4:00 Brazil -04/-03 2003 Sep 24
1071 -4:00 - -04 2004 Oct 1
1072 -4:00 Brazil -04/-03
1073 #
1074 # Rondônia (RO)
1075 Zone America/Porto_Velho -4:15:36 - LMT 1914
1076 -4:00 Brazil -04/-03 1988 Sep 12
1077 -4:00 - -04
1078 #
1079 # Roraima (RR)
1080 Zone America/Boa_Vista -4:02:40 - LMT 1914
1081 -4:00 Brazil -04/-03 1988 Sep 12
1082 -4:00 - -04 1999 Sep 30
1083 -4:00 Brazil -04/-03 2000 Oct 15
1084 -4:00 - -04
1085 #
1086 # east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto
1087 # The great circle line from Tabatinga to Porto Acre divides
1088 # east from west Amazonas.
1089 Zone America/Manaus -4:00:04 - LMT 1914
1090 -4:00 Brazil -04/-03 1988 Sep 12
1091 -4:00 - -04 1993 Sep 28
1092 -4:00 Brazil -04/-03 1994 Sep 22
1093 -4:00 - -04
1094 #
1095 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
1096 # Eirunepé, Envira, Ipixuna
1097 Zone America/Eirunepe -4:39:28 - LMT 1914
1098 -5:00 Brazil -05/-04 1988 Sep 12
1099 -5:00 - -05 1993 Sep 28
1100 -5:00 Brazil -05/-04 1994 Sep 22
1101 -5:00 - -05 2008 Jun 24 0:00
1102 -4:00 - -04 2013 Nov 10
1103 -5:00 - -05
1104 #
1105 # Acre (AC)
1106 Zone America/Rio_Branco -4:31:12 - LMT 1914
1107 -5:00 Brazil -05/-04 1988 Sep 12
1108 -5:00 - -05 2008 Jun 24 0:00
1109 -4:00 - -04 2013 Nov 10
1110 -5:00 - -05
1111
1112 # Chile
1113
1114 # From Paul Eggert (2015-04-03):
1115 # Shanks & Pottenger says America/Santiago introduced standard time in
1116 # 1890 and rounds its UT offset to 70W40; guess that in practice this
1117 # was the same offset as in 1916-1919. It also says Pacific/Easter
1118 # standardized on 109W22 in 1890; assume this didn't change the clocks.
1119 #
1120 # Dates for America/Santiago from 1910 to 2004 are primarily from
1121 # the following source, cited by Oscar van Vlijmen (2006-10-08):
1122 # [1] Chile Law
1123 # http://www.webexhibits.org/daylightsaving/chile.html
1124 # This contains a copy of this official table:
1125 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
1126 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
1127 # [1] needs several corrections, though.
1128 #
1129 # The first set of corrections is from:
1130 # [2] History of the Official Time of Chile
1131 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
1132 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
1133 # This is an English translation of:
1134 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
1135 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
1136 # A fancier Spanish version (requiring mouse-clicking) is at:
1137 # http://www.horaoficial.cl/historia_hora.html
1138 # Conflicts between [1] and [2] were resolved as follows:
1139 #
1140 # - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites
1141 # Boletín No. 1, Aviso No. 1 (1910). Go with [2].
1142 #
1143 # - [1] says SMT was -4:42:45, [2] says Chile's official time from
1144 # 1916 to 1919 was -4:42:46.3, the meridian of Chile's National
1145 # Astronomical Observatory (OAN), then located in what is now
1146 # Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46.
1147 #
1148 # - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites
1149 # Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2].
1150 #
1151 # - [1] does not give times for transitions; assume they occur
1152 # at midnight mainland time, the current common practice. However,
1153 # go with [2]'s specification of 23:00 for the 1947-05-21 transition.
1154 #
1155 # Another correction to [1] is from Jesper Nørgaard Welen, who
1156 # wrote (2006-10-08), "I think that there are some obvious mistakes in
1157 # the suggested link from Oscar van Vlijmen,... for instance entry 66
1158 # says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at
1159 # 1990-09-15 (they should have been 1990-09-15 and 1990-09-16
1160 # respectively), but anyhow it clears up some doubts too."
1161 #
1162 # Data for Pacific/Easter from 1910 through 1967 come from Shanks &
1163 # Pottenger. After that, for lack of better info assume
1164 # Pacific/Easter is always two hours behind America/Santiago;
1165 # this is known to work for DST transitions starting in 2008 and
1166 # may well be true for earlier transitions.
1167
1168 # From Eduardo Krell (1995-10-19):
1169 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
1170 # of October.... The law is the same for March and October.
1171 # (1998-09-29):
1172 # Because of the drought this year, the government decided to go into
1173 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
1174 # (unless there's another dry season next year, I guess).
1175
1176 # From Julio I. Pacheco Troncoso (1999-03-18):
1177 # Because of the same drought, the government decided to end DST later,
1178 # on April 3, (one-time change).
1179
1180 # From Germán Poo-Caamaño (2008-03-03):
1181 # Due to drought, Chile extends Daylight Time in three weeks. This
1182 # is one-time change (Saturday 3/29 at 24:00 for America/Santiago
1183 # and Saturday 3/29 at 22:00 for Pacific/Easter)
1184 # The Supreme Decree is located at
1185 # http://www.shoa.cl/servicios/supremo316.pdf
1186 #
1187 # From José Miguel Garrido (2008-03-05):
1188 # http://www.shoa.cl/noticias/2008/04hora/hora.htm
1189
1190 # From Angel Chiang (2010-03-04):
1191 # Subject: DST in Chile exceptionally extended to 3 April due to earthquake
1192 # http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098
1193 #
1194 # From Arthur David Olson (2010-03-06):
1195 # Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.
1196
1197 # From Glenn Eychaner (2011-03-28):
1198 # http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}
1199 # In English:
1200 # Chile's clocks will go back an hour this year on the 7th of May instead
1201 # of this Saturday. They will go forward again the 3rd Saturday in
1202 # August, not in October as they have since 1968.
1203
1204 # From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23):
1205 # As stated in the website of the Chilean Energy Ministry
1206 # http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html
1207 # The Chilean Government has decided to postpone the entrance into winter time
1208 # (to leave DST) from March 11 2012 to April 28th 2012....
1209 # Quote from the website communication:
1210 #
1211 # 6. For the year 2012, the dates of entry into winter time will be as follows:
1212 # a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at
1213 # 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00
1214 # of the same day.
1215 # b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is,
1216 # at 23:59:59, instead of passing to 0:00, the time should be adjusted to be
1217 # 01:00 on September 2.
1218
1219 # From Steffen Thorsen (2013-02-15):
1220 # According to several news sources, Chile has extended DST this year,
1221 # they will end DST later and start DST earlier than planned. They
1222 # hope to save energy. The new end date is 2013-04-28 00:00 and new
1223 # start date is 2013-09-08 00:00....
1224 # http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm
1225
1226 # From José Miguel Garrido (2014-02-19):
1227 # Today appeared in the Diario Oficial a decree amending the time change
1228 # dates to 2014.
1229 # DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC)
1230 # DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC)
1231 # http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf
1232
1233 # From Eduardo Romero Urra (2015-03-03):
1234 # Today has been published officially that Chile will use the DST time
1235 # permanently until March 25 of 2017
1236 # http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg
1237 #
1238 # From Paul Eggert (2015-03-03):
1239 # For now, assume that the extension will persist indefinitely.
1240
1241 # From Juan Correa (2016-03-18):
1242 # The decree regarding DST has been published in today's Official Gazette:
1243 # http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/
1244 # http://www.leychile.cl/Navegar?idNorma=1088502
1245 # It does consider the second Saturday of May and August as the dates
1246 # for the transition; and it lists DST dates until 2019, but I think
1247 # this scheme will stick.
1248 #
1249 # From Paul Eggert (2016-03-18):
1250 # For now, assume the pattern holds for the indefinite future.
1251 # The decree says transitions occur at 24:00; in practice this appears
1252 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
1253 # Island is always two hours behind the mainland.
1254
1255 # From Juan Correa (2016-12-04):
1256 # Magallanes region ... will keep DST (UTC -3) all year round....
1257 # 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
1258 #
1259 # From Deborah Goldsmith (2017-01-19):
1260 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
1261 # From Paul Eggert (2017-01-19):
1262 # The above says the Magallanes change expires 2019-05-11 at 24:00,
1263 # so in theory, they will revert to -04/-03 after that, which means
1264 # they will switch from -03 to -04 one hour after Santiago does that day.
1265 # For now, assume that they will not revert.
1266
1267 # From Juan Correa (2018-08-13):
1268 # As of moments ago, the Ministry of Energy in Chile has announced the new
1269 # schema for DST. ... Announcement in video (in Spanish):
1270 # https://twitter.com/MinEnergia/status/1029000399129374720
1271 # From Yonathan Dossow (2018-08-13):
1272 # The video says "first Saturday of September", we all know it means Sunday at
1273 # midnight.
1274 # From Tim Parenti (2018-08-13):
1275 # Translating the captions on the video at 0:44-0:55, "We want to announce as
1276 # Government that from 2019, Winter Time will be increased to 5 months, between
1277 # the first Saturday of April and the first Saturday of September."
1278 # At 2:08-2:20, "The Magallanes region will maintain its current time, as
1279 # decided by the citizens during 2017, but our Government will promote a
1280 # regional dialogue table to gather their opinion on this matter."
1281 # https://twitter.com/MinEnergia/status/1029009354001973248
1282 # "We will keep the new time policy unchanged for at least the next 4 years."
1283 # So we extend the new rules on Saturdays at 24:00 mainland time indefinitely.
1284
1285 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1286 Rule Chile 1927 1931 - Sep 1 0:00 1:00 -
1287 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1288 Rule Chile 1968 only - Nov 3 4:00u 1:00 -
1289 Rule Chile 1969 only - Mar 30 3:00u 0 -
1290 Rule Chile 1969 only - Nov 23 4:00u 1:00 -
1291 Rule Chile 1970 only - Mar 29 3:00u 0 -
1292 Rule Chile 1971 only - Mar 14 3:00u 0 -
1293 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 -
1294 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1295 Rule Chile 1973 only - Sep 30 4:00u 1:00 -
1296 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 -
1297 Rule Chile 1987 only - Apr 12 3:00u 0 -
1298 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1299 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 -
1300 Rule Chile 1990 only - Sep 16 4:00u 1:00 -
1301 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1302 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 -
1303 Rule Chile 1997 only - Mar 30 3:00u 0 -
1304 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1305 Rule Chile 1998 only - Sep 27 4:00u 1:00 -
1306 Rule Chile 1999 only - Apr 4 3:00u 0 -
1307 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 -
1308 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1309 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1310 # which is used below in specifying the transition.
1311 Rule Chile 2008 only - Mar 30 3:00u 0 -
1312 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1313 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1314 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1315 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 -
1316 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
1317 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 -
1318 Rule Chile 2016 2018 - May Sun>=9 3:00u 0 -
1319 Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 -
1320 Rule Chile 2019 max - Apr Sun>=2 3:00u 0 -
1321 Rule Chile 2019 max - Sep Sun>=2 4:00u 1:00 -
1322 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1323 # (1996-09) says 1998-03-08. Ignore these.
1324 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1325 Zone America/Santiago -4:42:46 - LMT 1890
1326 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1327 -5:00 - -05 1916 Jul 1
1328 -4:42:46 - SMT 1918 Sep 10
1329 -4:00 - -04 1919 Jul 1
1330 -4:42:46 - SMT 1927 Sep 1
1331 -5:00 Chile -05/-04 1932 Sep 1
1332 -4:00 - -04 1942 Jun 1
1333 -5:00 - -05 1942 Aug 1
1334 -4:00 - -04 1946 Jul 15
1335 -4:00 1:00 -03 1946 Sep 1 # central Chile
1336 -4:00 - -04 1947 Apr 1
1337 -5:00 - -05 1947 May 21 23:00
1338 -4:00 Chile -04/-03
1339 Zone America/Punta_Arenas -4:43:40 - LMT 1890
1340 -4:42:46 - SMT 1910 Jan 10
1341 -5:00 - -05 1916 Jul 1
1342 -4:42:46 - SMT 1918 Sep 10
1343 -4:00 - -04 1919 Jul 1
1344 -4:42:46 - SMT 1927 Sep 1
1345 -5:00 Chile -05/-04 1932 Sep 1
1346 -4:00 - -04 1942 Jun 1
1347 -5:00 - -05 1942 Aug 1
1348 -4:00 - -04 1947 Apr 1
1349 -5:00 - -05 1947 May 21 23:00
1350 -4:00 Chile -04/-03 2016 Dec 4
1351 -3:00 - -03
1352 Zone Pacific/Easter -7:17:28 - LMT 1890
1353 -7:17:28 - EMT 1932 Sep # Easter Mean Time
1354 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time
1355 -6:00 Chile -06/-05
1356 #
1357 # Salas y Gómez Island is uninhabited.
1358 # Other Chilean locations, including Juan Fernández Is, Desventuradas Is,
1359 # and Antarctic bases, are like America/Santiago.
1360
1361 # Antarctic base using South American rules
1362 # (See the file 'antarctica' for more.)
1363 #
1364 # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968)
1365 #
1366 # From Ethan Dicks (1996-10-06):
1367 # It keeps the same time as Punta Arenas, Chile, because, just like us
1368 # and the South Pole, that's the other end of their supply line....
1369 # I verified with someone who was there that since 1980,
1370 # Palmer has followed Chile. Prior to that, before the Falklands War,
1371 # Palmer used to be supplied from Argentina.
1372 #
1373 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1374 Zone Antarctica/Palmer 0 - -00 1965
1375 -4:00 Arg -04/-03 1969 Oct 5
1376 -3:00 Arg -03/-02 1982 May
1377 -4:00 Chile -04/-03 2016 Dec 4
1378 -3:00 - -03
1379
1380 # Colombia
1381
1382 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1383 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1384
1385 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1386 Rule CO 1992 only - May 3 0:00 1:00 -
1387 Rule CO 1993 only - Apr 4 0:00 0 -
1388 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1389 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1390 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1391 -5:00 CO -05/-04
1392 # Malpelo, Providencia, San Andres
1393 # no information; probably like America/Bogota
1394
1395 # Curaçao
1396
1397 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1398 #
1399 # From Paul Eggert (2006-03-22):
1400 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1401 # -4:00 since standard time was introduced on 1912-03-02; and that
1402 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1403 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1404 # Saba Island has been like Curaçao.
1405 # This all predates our 1970 cutoff, though.
1406 #
1407 # By July 2007 Curaçao and St Maarten are planned to become
1408 # associated states within the Netherlands, much like Aruba;
1409 # Bonaire, Saba and St Eustatius would become directly part of the
1410 # Netherlands as Kingdom Islands. This won't affect their time zones
1411 # though, as far as we know.
1412 #
1413 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1414 Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad
1415 -4:30 - -0430 1965
1416 -4:00 - AST
1417
1418 # From Arthur David Olson (2011-06-15):
1419 # use links for places with new iso3166 codes.
1420 # The name "Lower Prince's Quarter" is both longer than fourteen characters
1421 # and contains an apostrophe; use "Lower_Princes" below.
1422
1423 Link America/Curacao America/Lower_Princes # Sint Maarten
1424 Link America/Curacao America/Kralendijk # Caribbean Netherlands
1425
1426 # Ecuador
1427 #
1428 # Milne says the Central and South American Telegraph Company used -5:24:15.
1429 #
1430 # From Alois Treindl (2016-12-15):
1431 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
1432 # ... Whether the law applied also to Galápagos, I do not know.
1433 # From Paul Eggert (2016-12-15):
1434 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
1435 # This says President Sixto Durán Ballén signed decree No. 285, which
1436 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
1437 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did
1438 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
1439 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
1440 # sol" ("It was dawning in the middle of the night, the buses went to class
1441 # without sun"). Although Ballén's campaign slogan was "Ni un paso atrás"
1442 # (Not one step back), the clocks went back in 1993 and the experiment was not
1443 # repeated. For now, assume transitions were at 00:00 local time country-wide.
1444 #
1445 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1446 Rule Ecuador 1992 only - Nov 28 0:00 1:00 -
1447 Rule Ecuador 1993 only - Feb 5 0:00 0 -
1448 #
1449 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1450 Zone America/Guayaquil -5:19:20 - LMT 1890
1451 -5:14:00 - QMT 1931 # Quito Mean Time
1452 -5:00 Ecuador -05/-04
1453 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1454 -5:00 - -05 1986
1455 -6:00 Ecuador -06/-05
1456
1457 # Falklands
1458
1459 # From Paul Eggert (2006-03-22):
1460 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1461 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1462
1463 # From Falkland Islands Government Office, London (2001-01-22)
1464 # via Jesper Nørgaard:
1465 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1466 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1467 # September. It is anticipated that the clocks will revert back at 2
1468 # am on Sunday 21 April 2002 and advance to summer time at 2 am on
1469 # Sunday 1 September.
1470
1471 # From Rives McDow (2001-02-13):
1472 #
1473 # I have communicated several times with people there, and the last
1474 # time I had communications that was helpful was in 1998. Here is
1475 # what was said then:
1476 #
1477 # "The general rule was that Stanley used daylight saving and the Camp
1478 # did not. However for various reasons many people in the Camp have
1479 # started to use daylight saving (known locally as 'Stanley Time')
1480 # There is no rule as to who uses daylight saving - it is a matter of
1481 # personal choice and so it is impossible to draw a map showing who
1482 # uses it and who does not. Any list would be out of date as soon as
1483 # it was produced. This year daylight saving ended on April 18/19th
1484 # and started again on September 12/13th. I do not know what the rule
1485 # is, but can find out if you like. We do not change at the same time
1486 # as UK or Chile."
1487 #
1488 # I did have in my notes that the rule was "Second Saturday in Sep at
1489 # 0:00 until third Saturday in Apr at 0:00". I think that this does
1490 # not agree in some cases with Shanks; is this true?
1491 #
1492 # Also, there is no mention in the list that some areas in the
1493 # Falklands do not use DST. I have found in my communications there
1494 # that these areas are on the western half of East Falkland and all of
1495 # West Falkland. Stanley is the only place that consistently observes
1496 # DST. Again, as in other places in the world, the farmers don't like
1497 # it. West Falkland is almost entirely sheep farmers.
1498 #
1499 # I know one lady there that keeps a list of which farm keeps DST and
1500 # which doesn't each year. She runs a shop in Stanley, and says that
1501 # the list changes each year. She uses it to communicate to her
1502 # customers, catching them when they are home for lunch or dinner.
1503
1504 # From Paul Eggert (2001-03-05):
1505 # For now, we'll just record the time in Stanley, since we have no
1506 # better info.
1507
1508 # From Steffen Thorsen (2011-04-01):
1509 # The Falkland Islands will not turn back clocks this winter, but stay on
1510 # daylight saving time.
1511 #
1512 # One source:
1513 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3
1514 #
1515 # We have gotten this confirmed by a clerk of the legislative assembly:
1516 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1517 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1518 # hours) on the first Sunday of September at 0200hrs.
1519 #
1520 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1521 # will not revert to local mean time, but clocks will remain on Summer
1522 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1523 # change to local time following the trial period will be notified.
1524 #
1525 # From Andrew Newman (2012-02-24)
1526 # A letter from Justin McPhee, Chief Executive,
1527 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1528 # states...
1529 # The current Atlantic/Stanley entry under South America expects the
1530 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1531 # The database entry states that in 2011 Stanley was staying on fixed
1532 # summer time on a trial basis only. FIG need to contact IANA and/or
1533 # the maintainers of the database to inform them we're adopting
1534 # the same policy this year and suggest recommendations for future years.
1535 #
1536 # For now we will assume permanent -03 for the Falklands
1537 # until advised differently (to apply for 2012 and beyond, after the 2011
1538 # experiment was apparently successful.)
1539 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1540 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 -
1541 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1542 Rule Falk 1939 only - Oct 1 0:00 1:00 -
1543 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 -
1544 Rule Falk 1943 only - Jan 1 0:00 0 -
1545 Rule Falk 1983 only - Sep lastSun 0:00 1:00 -
1546 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1547 Rule Falk 1984 only - Sep 16 0:00 1:00 -
1548 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 -
1549 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1550 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1551 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 -
1552 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1553 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1554 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1555 -4:00 Falk -04/-03 1983 May
1556 -3:00 Falk -03/-02 1985 Sep 15
1557 -4:00 Falk -04/-03 2010 Sep 5 2:00
1558 -3:00 - -03
1559
1560 # French Guiana
1561 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1562 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1563 -4:00 - -04 1967 Oct
1564 -3:00 - -03
1565
1566 # Guyana
1567 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1568 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1569 -3:45 - -0345 1975 Jul 31
1570 -3:00 - -03 1991
1571 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1572 -4:00 - -04
1573
1574 # Paraguay
1575 #
1576 # From Paul Eggert (2006-03-22):
1577 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1578 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1579 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1580 #
1581 # From Waldemar Villamayor-Venialbo (2013-09-20):
1582 # No time of the day is established for the adjustment, so people normally
1583 # adjust their clocks at 0 hour of the given dates.
1584 #
1585 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1586 Rule Para 1975 1988 - Oct 1 0:00 1:00 -
1587 Rule Para 1975 1978 - Mar 1 0:00 0 -
1588 Rule Para 1979 1991 - Apr 1 0:00 0 -
1589 Rule Para 1989 only - Oct 22 0:00 1:00 -
1590 Rule Para 1990 only - Oct 1 0:00 1:00 -
1591 Rule Para 1991 only - Oct 6 0:00 1:00 -
1592 Rule Para 1992 only - Mar 1 0:00 0 -
1593 Rule Para 1992 only - Oct 5 0:00 1:00 -
1594 Rule Para 1993 only - Mar 31 0:00 0 -
1595 Rule Para 1993 1995 - Oct 1 0:00 1:00 -
1596 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1597 Rule Para 1996 only - Mar 1 0:00 0 -
1598 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1599 # From Steffen Thorsen (2000-10-02):
1600 # I have three independent reports that Paraguay changed to DST this Sunday
1601 # (10-01).
1602 #
1603 # Translated by Gwillim Law (2001-02-27) from
1604 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1605 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1606 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1607 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1608 # system has been operating for several years. Formerly there was a separate
1609 # decree each year; the new law has the same effect, but permanently. Every
1610 # year, the time will change on the first Sunday of October; likewise, the
1611 # clock will be set back on the first Sunday of March.
1612 #
1613 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 -
1614 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1615 Rule Para 1997 only - Feb lastSun 0:00 0 -
1616 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1617 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1618 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1619 # From Rives McDow (2002-02-28):
1620 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
1621 # dst method to be from the first Sunday in September to the first Sunday in
1622 # April.
1623 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1624 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 -
1625 #
1626 # From Jesper Nørgaard Welen (2005-01-02):
1627 # There are several sources that claim that Paraguay made
1628 # a timezone rule change in autumn 2004.
1629 # From Steffen Thorsen (2005-01-05):
1630 # Decree 1,867 (2004-03-05)
1631 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1632 # http://www.presidencia.gov.py/decretos/D1867.pdf
1633 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 -
1634 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1635 # From Carlos Raúl Perasso (2010-02-18):
1636 # By decree number 3958 issued yesterday
1637 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1638 # Paraguay changes its DST schedule, postponing the March rule to April and
1639 # modifying the October date. The decree reads:
1640 # ...
1641 # Art. 1. It is hereby established that from the second Sunday of the month of
1642 # April of this year (2010), the official time is to be set back 60 minutes,
1643 # and that on the first Sunday of the month of October, it is to be set
1644 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1645 # ...
1646 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 -
1647 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1648 #
1649 # From Steffen Thorsen (2013-03-07):
1650 # Paraguay will end DST on 2013-03-24 00:00....
1651 # http://www.ande.gov.py/interna.php?id=1075
1652 #
1653 # From Carlos Raúl Perasso (2013-03-15):
1654 # The change in Paraguay is now final. Decree number 10780
1655 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1656 # From Carlos Raúl Perasso (2014-02-28):
1657 # Decree 1264 can be found at:
1658 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1659 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1660
1661 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1662 Zone America/Asuncion -3:50:40 - LMT 1890
1663 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1664 -4:00 - -04 1972 Oct
1665 -3:00 - -03 1974 Apr
1666 -4:00 Para -04/-03
1667
1668 # Peru
1669 #
1670 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1671 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1672 # When we were in Peru in 1985-1986, they apparently switched over
1673 # sometime between December 29 and January 3 while we were on the Amazon.
1674 #
1675 # From Paul Eggert (2006-03-22):
1676 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1677
1678 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1679 Rule Peru 1938 only - Jan 1 0:00 1:00 -
1680 Rule Peru 1938 only - Apr 1 0:00 0 -
1681 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 -
1682 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1683 Rule Peru 1986 1987 - Jan 1 0:00 1:00 -
1684 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1685 Rule Peru 1990 only - Jan 1 0:00 1:00 -
1686 Rule Peru 1990 only - Apr 1 0:00 0 -
1687 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1688 Rule Peru 1994 only - Jan 1 0:00 1:00 -
1689 Rule Peru 1994 only - Apr 1 0:00 0 -
1690 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1691 Zone America/Lima -5:08:12 - LMT 1890
1692 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1693 -5:00 Peru -05/-04
1694
1695 # South Georgia
1696 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1697 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1698 -2:00 - -02
1699
1700 # South Sandwich Is
1701 # uninhabited; scientific personnel have wintered
1702
1703 # Suriname
1704 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1705 Zone America/Paramaribo -3:40:40 - LMT 1911
1706 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1707 -3:40:36 - PMT 1945 Oct # The capital moved?
1708 -3:30 - -0330 1984 Oct
1709 -3:00 - -03
1710
1711 # Trinidad and Tobago
1712 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1713 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
1714 -4:00 - AST
1715
1716 # These all agree with Trinidad and Tobago since 1970.
1717 Link America/Port_of_Spain America/Anguilla
1718 Link America/Port_of_Spain America/Antigua
1719 Link America/Port_of_Spain America/Dominica
1720 Link America/Port_of_Spain America/Grenada
1721 Link America/Port_of_Spain America/Guadeloupe
1722 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1723 Link America/Port_of_Spain America/Montserrat
1724 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1725 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1726 Link America/Port_of_Spain America/St_Lucia
1727 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1728 Link America/Port_of_Spain America/St_Vincent
1729 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1730
1731 # Uruguay
1732 # From Paul Eggert (1993-11-18):
1733 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1734 #
1735 # From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael
1736 # Deckers (2018-02-20):
1737 # ... At least they kept good records...
1738 #
1739 # http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36
1740 # Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and
1741 # Meteorology Service of the Uruguayan Navy, seems to give many transitions
1742 # with greater clarity than we've had before. It directly references many laws
1743 # and decrees which are, in turn, referenced below. They can be viewed in the
1744 # public archives of the Diario Oficial (in Spanish) at
1745 # http://www.impo.com.uy/diariooficial/
1746 #
1747 # Ley No. 3920 of 1908-06-10 placed the determination of legal time under the
1748 # auspices of the National Institute for the Prediction of Time. It is unclear
1749 # exactly what offset was used during this period, though Ley No. 7200 of
1750 # 1920-04-23 used the Observatory of the National Meteorological Institute in
1751 # Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian,
1752 # retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00,
1753 # resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on
1754 # page 725 of the Proceedings of the Second Pan-American Scientific Congress,
1755 # 1915-1916) was in use, and merely became official from 1908-06-10.
1756 # https://www.impo.com.uy/diariooficial/1908/06/18/12
1757 # https://www.impo.com.uy/diariooficial/1920/04/27/9
1758 #
1759 # Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced
1760 # by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14
1761 # minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the
1762 # National Council of Administration the same day, published directly below the
1763 # law in the Diario Oficial, specified the first transition to be 1923-09-30
1764 # 24:00. This effectively established standard time at UT-03:30 with 30
1765 # minutes DST. Assume transitions at 24:00 on the specified days until Ley No.
1766 # 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other
1767 # provisions which oppose" it, resulting in year-round UT-03:30; a Resolución
1768 # of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it
1769 # would have been under the previous law.
1770 # https://www.impo.com.uy/diariooficial/1923/07/02/2
1771 # https://www.impo.com.uy/diariooficial/1926/03/10/2
1772 # https://www.impo.com.uy/diariooficial/1926/03/18/2
1773 #
1774 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1775 Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 -
1776 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1777 # From Tim Parenti (2018-02-15):
1778 # http://www.impo.com.uy/diariooficial/1933/10/27/6
1779 #
1780 # It appears Ley No. 9122 of 1933 was never published as such in the Diario
1781 # Oficial, but instead appeared as Document 26 in the Diario on Friday
1782 # 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of
1783 # National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the
1784 # last Sunday of October...until the last Saturday of March." In accordance
1785 # with this provision, the first transition was explicitly specified in Article
1786 # 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29
1787 # at 00:00. Assume transitions at 00:00 Sunday throughout.
1788 #
1789 # Departing from the matter-of-fact nature of previous timekeeping laws, the
1790 # 1933 decree "consider[s] the advantages of...the advance of legal time":
1791 #
1792 # "Whereas: The measure adopted by almost all nations at the time of the last
1793 # World War still persists in North America and Europe, precisely because of
1794 # the economic, hygienic, and social advantages derived from such an
1795 # emergency measure...
1796 #
1797 # Whereas: The advance of the legal time during the summer seasons, by
1798 # displacing social activity near sunrise, favors the citizen populations
1799 # and especially the society that creates and works..."
1800 #
1801 # It further specified that "necessary measures" be taken to ensure that
1802 # "public spectacles finish, in general, before [01:00]."
1803 Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 -
1804 Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 -
1805 # From Tim Parenti (2018-02-15):
1806 # Most of the Rules below, and their contemporaneous Zone lines, have been
1807 # updated simply to match the Almanaque 2018. Although the document does not
1808 # list exact transition times, midnight transitions were already present in our
1809 # data here for all transitions through 2004-09, and this is both consistent
1810 # with prior transitions and verified in several decrees marked below between
1811 # 1939-09 and 2004-09, wherein the relevant text was typically of the form:
1812 #
1813 # "From 0 hours on [date], the legal time of the entire Republic will be...
1814 #
1815 # In accordance with [the preceding], on [previous date] at 24 hours, all
1816 # clocks throughout the Republic will be [advanced/retarded] by..."
1817 #
1818 # It is possible that there is greater specificity to be found for the Rules
1819 # below, but it is buried in no fewer than 40 different decrees individually
1820 # referenced by the Almanaque for the period from 1939-09 to 2014-09.
1821 # Four-fifths of these were promulgated less than two weeks before taking
1822 # effect; more than half within a week and none more than 5 weeks. Only the
1823 # handful with comments below have been checked with any thoroughness.
1824 Rule Uruguay 1939 only - Oct 1 0:00 0:30 -
1825 Rule Uruguay 1940 only - Oct 27 0:00 0:30 -
1826 # From Tim Parenti (2018-02-15):
1827 # Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified
1828 # UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel".
1829 # http://www.impo.com.uy/diariooficial/1941/08/04/1
1830 Rule Uruguay 1941 only - Aug 1 0:00 0:30 -
1831 # From Tim Parenti (2018-02-15):
1832 # Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified
1833 # further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks
1834 # never went back to UT-03:30 thereafter, this is modeled as advancing standard
1835 # time by 30 minutes to UT-03, while retaining 30 minutes of DST.
1836 # http://www.impo.com.uy/diariooficial/1942/12/16/3
1837 Rule Uruguay 1942 only - Dec 14 0:00 0:30 -
1838 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1839 Rule Uruguay 1959 only - May 24 0:00 0:30 -
1840 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1841 Rule Uruguay 1960 only - Jan 17 0:00 1:00 -
1842 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1843 Rule Uruguay 1965 only - Apr 4 0:00 1:00 -
1844 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1845 # From Tim Parenti (2018-02-15):
1846 # Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the
1847 # day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00.
1848 # http://www.impo.com.uy/diariooficial/1968/05/30/5
1849 Rule Uruguay 1968 only - May 27 0:00 0:30 -
1850 Rule Uruguay 1968 only - Dec 1 0:00 0 -
1851 # From Tim Parenti (2018-02-15):
1852 # Decreto 188/970 of 1970-04-23 instituted restrictions on electricity
1853 # consumption "as a consequence of the current rainfall regime in the country".
1854 # Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00.
1855 # http://www.impo.com.uy/diariooficial/1970/04/29/4
1856 Rule Uruguay 1970 only - Apr 25 0:00 1:00 -
1857 Rule Uruguay 1970 only - Jun 14 0:00 0 -
1858 Rule Uruguay 1972 only - Apr 23 0:00 1:00 -
1859 Rule Uruguay 1972 only - Jul 16 0:00 0 -
1860 # From Tim Parenti (2018-02-15):
1861 # Decreto 29/974 of 1974-01-11, citing "the international rise in the price of
1862 # oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of
1863 # 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30
1864 # minutes followed in Decreto 679/974 of 1974-08-29.
1865 # http://www.impo.com.uy/diariooficial/1974/01/22/11
1866 # http://www.impo.com.uy/diariooficial/1974/03/14/3
1867 # http://www.impo.com.uy/diariooficial/1974/09/04/6
1868 Rule Uruguay 1974 only - Jan 13 0:00 1:30 -
1869 Rule Uruguay 1974 only - Mar 10 0:00 0:30 -
1870 Rule Uruguay 1974 only - Sep 1 0:00 0 -
1871 Rule Uruguay 1974 only - Dec 22 0:00 1:00 -
1872 Rule Uruguay 1975 only - Mar 30 0:00 0 -
1873 Rule Uruguay 1976 only - Dec 19 0:00 1:00 -
1874 Rule Uruguay 1977 only - Mar 6 0:00 0 -
1875 Rule Uruguay 1977 only - Dec 4 0:00 1:00 -
1876 Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 -
1877 Rule Uruguay 1978 only - Dec 17 0:00 1:00 -
1878 Rule Uruguay 1979 only - Apr 29 0:00 1:00 -
1879 Rule Uruguay 1980 only - Mar 16 0:00 0 -
1880 # From Tim Parenti (2018-02-15):
1881 # Decreto 725/987 of 1987-12-04 cited "better use of national tourist
1882 # attractions" to advance clocks one hour from Monday 1987-12-14 00:00.
1883 # http://www.impo.com.uy/diariooficial/1988/01/25/1
1884 Rule Uruguay 1987 only - Dec 14 0:00 1:00 -
1885 Rule Uruguay 1988 only - Feb 28 0:00 0 -
1886 Rule Uruguay 1988 only - Dec 11 0:00 1:00 -
1887 Rule Uruguay 1989 only - Mar 5 0:00 0 -
1888 Rule Uruguay 1989 only - Oct 29 0:00 1:00 -
1889 Rule Uruguay 1990 only - Feb 25 0:00 0 -
1890 # From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04):
1891 # IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the
1892 # 1992/1993 season appears to be the first in over half a century where DST
1893 # both began and ended pursuant to the same decree.
1894 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 -
1895 Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 -
1896 Rule Uruguay 1992 only - Oct 18 0:00 1:00 -
1897 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1898 # From Eduardo Cota (2004-09-20):
1899 # The Uruguayan government has decreed a change in the local time....
1900 # From Tim Parenti (2018-02-15):
1901 # Decreto 328/004 of 2004-09-15.
1902 # http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1
1903 Rule Uruguay 2004 only - Sep 19 0:00 1:00 -
1904 # From Steffen Thorsen (2005-03-11):
1905 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1906 # save energy ... it was postponed two weeks....
1907 # From Tim Parenti (2018-02-15):
1908 # This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous
1909 # reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending
1910 # Decreto 328/004:
1911 # http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1
1912 # The original decree specified a transition of 2005-03-12 24:00, but the new
1913 # one specified 2005-03-27 02:00.
1914 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1915 # From Eduardo Cota (2005-09-27):
1916 # ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time,
1917 # official time in Uruguay will be at GMT -2.
1918 # From Tim Parenti (2018-02-15):
1919 # Decreto 318/005 of 2005-09-19.
1920 # http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1
1921 Rule Uruguay 2005 only - Oct 9 2:00 1:00 -
1922 Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 -
1923 # From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06):
1924 # Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday
1925 # of October at 02:00 through the second Sunday of March at 02:00. Almanaque
1926 # 2018 appears to have a few typoed dates through this period; ignore them.
1927 # http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1
1928 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 -
1929 # From Steffen Thorsen (2015-06-30):
1930 # ... it looks like they will not be using DST the coming summer:
1931 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
1932 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
1933 # From Paul Eggert (2015-06-30):
1934 # Apparently restaurateurs complained that DST caused people to go to the beach
1935 # instead of out to dinner.
1936 # From Pablo Camargo (2015-07-13):
1937 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
1938 # From Tim Parenti (2018-02-15):
1939 # Decreto 178/015 of 2015-06-29; repeals Decreto 311/006.
1940
1941 # This Zone can be simplified once we assume zic %z.
1942 Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10
1943 -3:44:51 - MMT 1920 May 1 # Montevideo MT
1944 -4:00 - -04 1923 Oct 1
1945 -3:30 Uruguay -0330/-03 1942 Dec 14
1946 -3:00 Uruguay -03/-0230 1960
1947 -3:00 Uruguay -03/-02 1968
1948 -3:00 Uruguay -03/-0230 1970
1949 -3:00 Uruguay -03/-02 1974
1950 -3:00 Uruguay -03/-0130 1974 Mar 10
1951 -3:00 Uruguay -03/-0230 1974 Dec 22
1952 -3:00 Uruguay -03/-02
1953
1954 # Venezuela
1955 #
1956 # From Paul Eggert (2015-07-28):
1957 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
1958 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
1959 #
1960 # From John Stainforth (2007-11-28):
1961 # ... the change for Venezuela originally expected for 2007-12-31 has
1962 # been brought forward to 2007-12-09. The official announcement was
1963 # published today in the "Gaceta Oficial de la República Bolivariana
1964 # de Venezuela, número 38.819" (official document for all laws or
1965 # resolution publication)
1966 # http://www.globovision.com/news.php?nid=72208
1967
1968 # From Alexander Krivenyshev (2016-04-15):
1969 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
1970 #
1971 # From Paul Eggert (2016-04-15):
1972 # Clocks advance 30 minutes on 2016-05-01 at 02:30....
1973 # "'Venezuela's new time-zone: hours without light, hours without water,
1974 # hours of presidential broadcasts, hours of lines,' quipped comedian
1975 # Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps
1976 # half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400
1977 # https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE
1978 #
1979 # From Matt Johnson (2016-04-20):
1980 # ... published in the official Gazette [2016-04-18], here:
1981 # http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf
1982
1983 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1984 Zone America/Caracas -4:27:44 - LMT 1890
1985 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1986 -4:30 - -0430 1965 Jan 1 0:00
1987 -4:00 - -04 2007 Dec 9 3:00
1988 -4:30 - -0430 2016 May 1 2:30
1989 -4:00 - -04