1# This file is in the public domain, so clarified as of 2# 2009-05-17 by Arthur David Olson. 3 4# This file is by no means authoritative; if you think you know better, 5# go ahead and edit the file (and please send any changes to 6# tz@iana.org for general use in the future). For more, please see 7# the file CONTRIBUTING in the tz distribution. 8 9# From Paul Eggert (2016-12-05): 10# 11# Unless otherwise specified, the source for data through 1990 is: 12# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 13# San Diego: ACS Publications, Inc. (2003). 14# Unfortunately this book contains many errors and cites no sources. 15# 16# Many years ago Gwillim Law wrote that a good source 17# for time zone data was the International Air Transport 18# Association's Standard Schedules Information Manual (IATA SSIM), 19# published semiannually. Law sent in several helpful summaries 20# of the IATA's data after 1990. Except where otherwise noted, 21# IATA SSIM is the source for entries after 1990. 22# 23# For data circa 1899, a common source is: 24# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. 25# https://www.jstor.org/stable/1774359 26# 27# These tables use numeric abbreviations like -03 and -0330 for 28# integer hour and minute UT offsets. Although earlier editions used 29# alphabetic time zone abbreviations, these abbreviations were 30# invented and did not reflect common practice. 31 32############################################################################### 33 34############################################################################### 35 36# Argentina 37 38# From Bob Devine (1988-01-28): 39# Argentina: first Sunday in October to first Sunday in April since 1976. 40# Double Summer time from 1969 to 1974. Switches at midnight. 41 42# From U. S. Naval Observatory (1988-01-19): 43# ARGENTINA 3 H BEHIND UTC 44 45# From Hernan G. Otero (1995-06-26): 46# I am sending modifications to the Argentine time zone table... 47# AR was chosen because they are the ISO letters that represent Argentina. 48 49# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 50Rule Arg 1930 only - Dec 1 0:00 1:00 - 51Rule Arg 1931 only - Apr 1 0:00 0 - 52Rule Arg 1931 only - Oct 15 0:00 1:00 - 53Rule Arg 1932 1940 - Mar 1 0:00 0 - 54Rule Arg 1932 1939 - Nov 1 0:00 1:00 - 55Rule Arg 1940 only - Jul 1 0:00 1:00 - 56Rule Arg 1941 only - Jun 15 0:00 0 - 57Rule Arg 1941 only - Oct 15 0:00 1:00 - 58Rule Arg 1943 only - Aug 1 0:00 0 - 59Rule Arg 1943 only - Oct 15 0:00 1:00 - 60Rule Arg 1946 only - Mar 1 0:00 0 - 61Rule Arg 1946 only - Oct 1 0:00 1:00 - 62Rule Arg 1963 only - Oct 1 0:00 0 - 63Rule Arg 1963 only - Dec 15 0:00 1:00 - 64Rule Arg 1964 1966 - Mar 1 0:00 0 - 65Rule Arg 1964 1966 - Oct 15 0:00 1:00 - 66Rule Arg 1967 only - Apr 2 0:00 0 - 67Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 - 68Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 - 69Rule Arg 1974 only - Jan 23 0:00 1:00 - 70Rule Arg 1974 only - May 1 0:00 0 - 71Rule Arg 1988 only - Dec 1 0:00 1:00 - 72# 73# From Hernan G. Otero (1995-06-26): 74# These corrections were contributed by InterSoft Argentina S.A., 75# obtaining the data from the: 76# Talleres de Hidrografía Naval Argentina 77# (Argentine Naval Hydrography Institute) 78Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 79Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 - 80# 81# From Hernan G. Otero (1995-06-26): 82# From this moment on, the law that mandated the daylight saving 83# time corrections was derogated and no more modifications 84# to the time zones (for daylight saving) are now made. 85# 86# From Rives McDow (2000-01-10): 87# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time, 88# which did not result in the switch of a time zone, as they stayed 9 hours 89# from the International Date Line. 90Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 - 91# From Paul Eggert (2007-12-28): 92# DST was set to expire on March 5, not March 3, but since it was converted 93# to standard time on March 3 it's more convenient for us to pretend that 94# it ended on March 3. 95Rule Arg 2000 only - Mar 3 0:00 0 - 96# 97# From Peter Gradelski via Steffen Thorsen (2000-03-01): 98# We just checked with our São Paulo office and they say the government of 99# Argentina decided not to become one of the countries that go on or off DST. 100# So Buenos Aires should be -3 hours from GMT at all times. 101# 102# From Fabián L. Arce Jofré (2000-04-04): 103# The law that claimed DST for Argentina was derogated by President Fernando 104# de la Rúa on March 2, 2000, because it would make people spend more energy 105# in the winter time, rather than less. The change took effect on March 3. 106# 107# From Mariano Absatz (2001-06-06): 108# one of the major newspapers here in Argentina said that the 1999 109# Timezone Law (which never was effectively applied) will (would?) be 110# in effect.... The article is at 111# http://ar.clarin.com/diario/2001-06-06/e-01701.htm 112# ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted 113# 1999-09-17, and published 1999-09-21. The official publication is at: 114# http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF 115# Regretfully, you have to subscribe (and pay) for the on-line version.... 116# 117# (2001-06-12): 118# the timezone for Argentina will not change next Sunday. 119# Apparently it will do so on Sunday 24th.... 120# http://ar.clarin.com/diario/2001-06-12/s-03501.htm 121# 122# (2001-06-25): 123# Last Friday (yes, the last working day before the date of the change), the 124# Senate annulled the 1999 law that introduced the changes later postponed. 125# http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm 126# It remains the vote of the Deputies..., but it will be the same.... 127# This kind of things had always been done this way in Argentina. 128# We are still -03:00 all year round in all of the country. 129# 130# From Steffen Thorsen (2007-12-21): 131# A user (Leonardo Chaim) reported that Argentina will adopt DST.... 132# all of the country (all Zone-entries) are affected. News reports like 133# http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate 134# that Argentina will use DST next year as well, from October to 135# March, although exact rules are not given. 136# 137# From Jesper Nørgaard Welen (2007-12-26) 138# The last hurdle of Argentina DST is over, the proposal was approved in 139# the lower chamber too (Diputados) with a vote 192 for and 2 against. 140# By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to 141# the original scanned proposal, where the dates and the zero hours are 142# clear and unambiguous...This is the article about final approval: 143# http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996 144# 145# From Paul Eggert (2007-12-22): 146# For dates after mid-2008, the following rules are my guesses and 147# are quite possibly wrong, but are more likely than no DST at all. 148 149# From Alexander Krivenyshev (2008-09-05): 150# As per message from Carlos Alberto Fonseca Arauz (Nicaragua), 151# Argentina will start DST on Sunday October 19, 2008. 152# 153# http://www.worldtimezone.com/dst_news/dst_news_argentina03.html 154# http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish) 155 156# From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07) 157# via Rodrigo Severo: 158# Argentinian law No. 25.155 is no longer valid. 159# http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm 160# The new one is law No. 26.350 161# http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm 162# So there is no summer time in Argentina for now. 163 164# From Mariano Absatz (2008-10-20): 165# Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST 166# in Argentina from 2008-10-19 until 2009-03-15. 167# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01 168# 169 170# Decree 1705/2008 excepting 12 Provinces from applying DST in the summer 171# 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La 172# Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego 173# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01 174# 175# Press release 235 dated Saturday October 18th, from the Government of the 176# Province of Jujuy saying it will not apply DST either (even when it was not 177# included in Decree 1705/2008). 178# http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc 179 180# From fullinet (2009-10-18): 181# As announced in 182# http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356 183# (an official .gob.ar) under title: "Sin Cambio de Hora" 184# (English: "No hour change"). 185# 186# "Por el momento, el Gobierno Nacional resolvió no modificar la hora 187# oficial, decisión que estaba en estudio para su implementación el 188# domingo 18 de octubre. Desde el Ministerio de Planificación se anunció 189# que la Argentina hoy, en estas condiciones meteorológicas, no necesita 190# la modificación del huso horario, ya que 2009 nos encuentra con 191# crecimiento en la producción y distribución energética." 192 193Rule Arg 2007 only - Dec 30 0:00 1:00 - 194Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 - 195Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 - 196 197# From Mariano Absatz (2004-05-21): 198# Today it was officially published that the Province of Mendoza is changing 199# its timezone this winter... starting tomorrow night.... 200# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf 201# From Paul Eggert (2004-05-24): 202# It's Law No. 7,210. This change is due to a public power emergency, so for 203# now we'll assume it's for this year only. 204# 205# From Paul Eggert (2018-01-31): 206# Hora de verano para la República Argentina 207# http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html 208# says that standard time in Argentina from 1894-10-31 209# to 1920-05-01 was -4:16:48.25. Go with this more-precise value 210# over Shanks & Pottenger. It is upward compatible with Milne, who 211# says Córdoba time was -4:16:48.2. 212 213# 214# From Mariano Absatz (2004-06-05): 215# These media articles from a major newspaper mostly cover the current state: 216# http://www.lanacion.com.ar/04/05/27/de_604825.asp 217# http://www.lanacion.com.ar/04/05/28/de_605203.asp 218# 219# The following eight (8) provinces pulled clocks back to UTC-04:00 at 220# midnight Monday May 31st. (that is, the night between 05/31 and 06/01). 221# Apparently, all nine provinces would go back to UTC-03:00 at the same 222# time in October 17th. 223# 224# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz, 225# Tierra del Fuego, Tucumán. 226# 227# From Mariano Absatz (2004-06-14): 228# ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00 229# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's 230# annoyance with the change is much higher than the power savings obtained.... 231# 232# From Gwillim Law (2004-06-14): 233# http://www.lanacion.com.ar/04/06/10/de_609078.asp ... 234# "The time change in Tierra del Fuego was a conflicted decision from 235# the start. The government had decreed that the measure would take 236# effect on June 1, but a normative error forced the new time to begin 237# three days earlier, from a Saturday to a Sunday.... 238# Our understanding was that the change was originally scheduled to take place 239# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other 240# provinces). Sunday was May 30, only two days earlier. So the article 241# contains a contradiction. I would give more credence to the Saturday/Sunday 242# date than the "three days earlier" phrase, and conclude that Tierra del 243# Fuego set its clocks back at 2004-05-30 00:00. 244# 245# From Steffen Thorsen (2004-10-05): 246# The previous law 7210 which changed the province of Mendoza's time zone 247# back in May have been modified slightly in a new law 7277, which set the 248# new end date to 2004-09-26 (original date was 2004-10-17). 249# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf 250# 251# From Mariano Absatz (2004-10-05): 252# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between 253# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00 254# at midnight between Saturday, July 24th and Sunday, July 25th.... 255# http://www.sanjuan.gov.ar/prensa/archivo/000329.html 256# http://www.sanjuan.gov.ar/prensa/archivo/000426.html 257# http://www.sanjuan.gov.ar/prensa/archivo/000441.html 258 259# From Alex Krivenyshev (2008-01-17): 260# Here are articles that Argentina Province San Luis is planning to end DST 261# as earlier as upcoming Monday January 21, 2008 or February 2008: 262# 263# Provincia argentina retrasa reloj y marca diferencia con resto del país 264# (Argentine Province delayed clock and mark difference with the rest of the 265# country) 266# http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel 267# 268# Es inminente que en San Luis atrasen una hora los relojes 269# (It is imminent in San Luis clocks one hour delay) 270# https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html 271# http://www.worldtimezone.com/dst_news/dst_news_argentina02.html 272 273# From Jesper Nørgaard Welen (2008-01-18): 274# The page of the San Luis provincial government 275# http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812 276# confirms what Alex Krivenyshev has earlier sent to the tz 277# emailing list about that San Luis plans to return to standard 278# time much earlier than the rest of the country. It also 279# confirms that upon request the provinces San Juan and Mendoza 280# refused to follow San Luis in this change. 281# 282# The change is supposed to take place Monday the 21st at 0:00 283# hours. As far as I understand it if this goes ahead, we need 284# a new timezone for San Luis (although there are also documented 285# independent changes in the southamerica file of San Luis in 286# 1990 and 1991 which has not been confirmed). 287 288# From Jesper Nørgaard Welen (2008-01-25): 289# Unfortunately the below page has become defunct, about the San Luis 290# time change. Perhaps because it now is part of a group of pages "Most 291# important pages of 2008." 292# 293# You can use 294# http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834 295# instead it seems. Or use "Buscador" from the main page of the San Luis 296# government, and fill in "huso" and click OK, and you will get 3 pages 297# from which the first one is identical to the above. 298 299# From Mariano Absatz (2008-01-28): 300# I can confirm that the Province of San Luis (and so far only that 301# province) decided to go back to UTC-3 effective midnight Jan 20th 2008 302# (that is, Monday 21st at 0:00 is the time the clocks were delayed back 303# 1 hour), and they intend to keep UTC-3 as their timezone all year round 304# (that is, unless they change their mind any minute now). 305# 306# So we'll have to add yet another city to 'southamerica' (I think San 307# Luis city is the mos populated city in the Province, so it'd be 308# America/Argentina/San_Luis... of course I can't remember if San Luis's 309# history of particular changes goes along with Mendoza or San Juan :-( 310# (I only remember not being able to collect hard facts about San Luis 311# back in 2004, when these provinces changed to UTC-4 for a few days, I 312# mailed them personally and never got an answer). 313 314# From Paul Eggert (2014-08-12): 315# Unless otherwise specified, data entries are from Shanks & Pottenger through 316# 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that 317# America/Cordoba split into 6 subregions during 1991/1992, one of which 318# was America/San_Luis, but we haven't verified this yet so for now we'll 319# keep America/Cordoba a single region rather than splitting it into the 320# other 5 subregions. 321 322# From Mariano Absatz (2009-03-13): 323# Yesterday (with our usual 2-day notice) the Province of San Luis 324# decided that next Sunday instead of "staying" @utc-03:00 they will go 325# to utc-04:00 until the second Saturday in October... 326# 327# The press release is at 328# http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102 329# (I couldn't find the decree, but www.sanluis.gov.ar 330# is the official page for the Province Government.) 331# 332# There's also a note in only one of the major national papers ... 333# http://www.lanacion.com.ar/nota.asp?nota_id=1107912 334# 335# The press release says [quick and dirty translation]: 336# ... announced that next Sunday, at 00:00, Puntanos (the San Luis 337# inhabitants) will have to turn back one hour their clocks 338# 339# Since then, San Luis will establish its own Province timezone. Thus, 340# during 2009, this timezone change will run from 00:00 the third Sunday 341# in March until 24:00 of the second Saturday in October. 342 343# From Mariano Absatz (2009-10-16): 344# ...the Province of San Luis is a case in itself. 345# 346# The Law at 347# http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276 348# is ambiguous because establishes a calendar from the 2nd Sunday in 349# October at 0:00 thru the 2nd Saturday in March at 24:00 and the 350# complement of that starting on the 2nd Sunday of March at 0:00 and 351# ending on the 2nd Saturday of March at 24:00. 352# 353# This clearly breaks every time the 1st of March or October is a Sunday. 354# 355# IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd 356# Sunday of October and March. 357# 358# The problem is that the changes in the rest of the Provinces that did 359# change in 2007/2008, were made according to the Federal Law and Decrees 360# that did so on the 3rd Sunday of October and March. 361# 362# In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday 363# (October 11th) at 0:00. 364# 365# So I guess a new set of rules, besides "Arg", must be made and the last 366# America/Argentina/San_Luis entries should change to use these... 367# ... 368 369# From Alexander Krivenyshev (2010-04-09): 370# According to news reports from El Diario de la República Province San 371# Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time 372# after April 11, 2010 - will continue to have same time as rest of 373# Argentina (UTC-3) (no DST). 374# 375# Confirmaron la prórroga del huso horario de verano (Spanish) 376# http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9 377# or (some English translation): 378# http://www.worldtimezone.com/dst_news/dst_news_argentina08.html 379 380# From Mariano Absatz (2010-04-12): 381# yes...I can confirm this...and given that San Luis keeps calling 382# UTC-03:00 "summer time", we should't just let San Luis go back to "Arg" 383# rules...San Luis is still using "Western ARgentina Time" and it got 384# stuck on Summer daylight savings time even though the summer is over. 385 386# From Paul Eggert (2018-01-23): 387# Perhaps San Luis operates on the legal fiction that it is at -04 388# with perpetual daylight saving time, but ordinary usage typically seems to 389# just say it's at -03; see, for example, 390# https://es.wikipedia.org/wiki/Hora_oficial_argentina 391# We've documented similar situations as being plain changes to 392# standard time, so let's do that here too. This does not change UTC 393# offsets, only tm_isdst and the time zone abbreviations. One minor 394# plus is that this silences a zic complaint that there's no POSIX TZ 395# setting for time stamps past 2038. 396 397# Zone NAME GMTOFF RULES FORMAT [UNTIL] 398# 399# Buenos Aires (BA), Capital Federal (CF), 400Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31 401 -4:16:48 - CMT 1920 May # Córdoba Mean Time 402 -4:00 - -04 1930 Dec 403 -4:00 Arg -04/-03 1969 Oct 5 404 -3:00 Arg -03/-02 1999 Oct 3 405 -4:00 Arg -04/-03 2000 Mar 3 406 -3:00 Arg -03/-02 407# 408# Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN), 409# Chaco (CC), Formosa (FM), Santiago del Estero (SE) 410# 411# Shanks & Pottenger also make the following claims, which we haven't verified: 412# - Formosa switched to -3:00 on 1991-01-07. 413# - Misiones switched to -3:00 on 1990-12-29. 414# - Chaco switched to -3:00 on 1991-01-04. 415# - Santiago del Estero switched to -4:00 on 1991-04-01, 416# then to -3:00 on 1991-04-26. 417# 418Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31 419 -4:16:48 - CMT 1920 May 420 -4:00 - -04 1930 Dec 421 -4:00 Arg -04/-03 1969 Oct 5 422 -3:00 Arg -03/-02 1991 Mar 3 423 -4:00 - -04 1991 Oct 20 424 -3:00 Arg -03/-02 1999 Oct 3 425 -4:00 Arg -04/-03 2000 Mar 3 426 -3:00 Arg -03/-02 427# 428# Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN) 429Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31 430 -4:16:48 - CMT 1920 May 431 -4:00 - -04 1930 Dec 432 -4:00 Arg -04/-03 1969 Oct 5 433 -3:00 Arg -03/-02 1991 Mar 3 434 -4:00 - -04 1991 Oct 20 435 -3:00 Arg -03/-02 1999 Oct 3 436 -4:00 Arg -04/-03 2000 Mar 3 437 -3:00 Arg -03/-02 2008 Oct 18 438 -3:00 - -03 439# 440# Tucumán (TM) 441Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31 442 -4:16:48 - CMT 1920 May 443 -4:00 - -04 1930 Dec 444 -4:00 Arg -04/-03 1969 Oct 5 445 -3:00 Arg -03/-02 1991 Mar 3 446 -4:00 - -04 1991 Oct 20 447 -3:00 Arg -03/-02 1999 Oct 3 448 -4:00 Arg -04/-03 2000 Mar 3 449 -3:00 - -03 2004 Jun 1 450 -4:00 - -04 2004 Jun 13 451 -3:00 Arg -03/-02 452# 453# La Rioja (LR) 454Zone America/Argentina/La_Rioja -4:27:24 - 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 1 459 -4:00 - -04 1991 May 7 460 -3:00 Arg -03/-02 1999 Oct 3 461 -4:00 Arg -04/-03 2000 Mar 3 462 -3:00 - -03 2004 Jun 1 463 -4:00 - -04 2004 Jun 20 464 -3:00 Arg -03/-02 2008 Oct 18 465 -3:00 - -03 466# 467# San Juan (SJ) 468Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31 469 -4:16:48 - CMT 1920 May 470 -4:00 - -04 1930 Dec 471 -4:00 Arg -04/-03 1969 Oct 5 472 -3:00 Arg -03/-02 1991 Mar 1 473 -4:00 - -04 1991 May 7 474 -3:00 Arg -03/-02 1999 Oct 3 475 -4:00 Arg -04/-03 2000 Mar 3 476 -3:00 - -03 2004 May 31 477 -4:00 - -04 2004 Jul 25 478 -3:00 Arg -03/-02 2008 Oct 18 479 -3:00 - -03 480# 481# Jujuy (JY) 482Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31 483 -4:16:48 - CMT 1920 May 484 -4:00 - -04 1930 Dec 485 -4:00 Arg -04/-03 1969 Oct 5 486 -3:00 Arg -03/-02 1990 Mar 4 487 -4:00 - -04 1990 Oct 28 488 -4:00 1:00 -03 1991 Mar 17 489 -4:00 - -04 1991 Oct 6 490 -3:00 1:00 -02 1992 491 -3:00 Arg -03/-02 1999 Oct 3 492 -4:00 Arg -04/-03 2000 Mar 3 493 -3:00 Arg -03/-02 2008 Oct 18 494 -3:00 - -03 495# 496# Catamarca (CT), Chubut (CH) 497Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 498 -4:16:48 - CMT 1920 May 499 -4:00 - -04 1930 Dec 500 -4:00 Arg -04/-03 1969 Oct 5 501 -3:00 Arg -03/-02 1991 Mar 3 502 -4:00 - -04 1991 Oct 20 503 -3:00 Arg -03/-02 1999 Oct 3 504 -4:00 Arg -04/-03 2000 Mar 3 505 -3:00 - -03 2004 Jun 1 506 -4:00 - -04 2004 Jun 20 507 -3:00 Arg -03/-02 2008 Oct 18 508 -3:00 - -03 509# 510# Mendoza (MZ) 511Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31 512 -4:16:48 - CMT 1920 May 513 -4:00 - -04 1930 Dec 514 -4:00 Arg -04/-03 1969 Oct 5 515 -3:00 Arg -03/-02 1990 Mar 4 516 -4:00 - -04 1990 Oct 15 517 -4:00 1:00 -03 1991 Mar 1 518 -4:00 - -04 1991 Oct 15 519 -4:00 1:00 -03 1992 Mar 1 520 -4:00 - -04 1992 Oct 18 521 -3:00 Arg -03/-02 1999 Oct 3 522 -4:00 Arg -04/-03 2000 Mar 3 523 -3:00 - -03 2004 May 23 524 -4:00 - -04 2004 Sep 26 525 -3:00 Arg -03/-02 2008 Oct 18 526 -3:00 - -03 527# 528# San Luis (SL) 529 530Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 - 531Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 - 532 533Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31 534 -4:16:48 - CMT 1920 May 535 -4:00 - -04 1930 Dec 536 -4:00 Arg -04/-03 1969 Oct 5 537 -3:00 Arg -03/-02 1990 538 -3:00 1:00 -02 1990 Mar 14 539 -4:00 - -04 1990 Oct 15 540 -4:00 1:00 -03 1991 Mar 1 541 -4:00 - -04 1991 Jun 1 542 -3:00 - -03 1999 Oct 3 543 -4:00 1:00 -03 2000 Mar 3 544 -3:00 - -03 2004 May 31 545 -4:00 - -04 2004 Jul 25 546 -3:00 Arg -03/-02 2008 Jan 21 547 -4:00 SanLuis -04/-03 2009 Oct 11 548 -3:00 - -03 549# 550# Santa Cruz (SC) 551Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 552 -4:16:48 - CMT 1920 May 553 -4:00 - -04 1930 Dec 554 -4:00 Arg -04/-03 1969 Oct 5 555 -3:00 Arg -03/-02 1999 Oct 3 556 -4:00 Arg -04/-03 2000 Mar 3 557 -3:00 - -03 2004 Jun 1 558 -4:00 - -04 2004 Jun 20 559 -3:00 Arg -03/-02 2008 Oct 18 560 -3:00 - -03 561# 562# Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF) 563Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 564 -4:16:48 - CMT 1920 May 565 -4:00 - -04 1930 Dec 566 -4:00 Arg -04/-03 1969 Oct 5 567 -3:00 Arg -03/-02 1999 Oct 3 568 -4:00 Arg -04/-03 2000 Mar 3 569 -3:00 - -03 2004 May 30 570 -4:00 - -04 2004 Jun 20 571 -3:00 Arg -03/-02 2008 Oct 18 572 -3:00 - -03 573 574# Aruba 575Link America/Curacao America/Aruba 576 577# Bolivia 578# Zone NAME GMTOFF RULES FORMAT [UNTIL] 579Zone America/La_Paz -4:32:36 - LMT 1890 580 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT 581 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST 582 -4:00 - -04 583 584# Brazil 585 586# From Paul Eggert (1993-11-18): 587# The mayor of Rio recently attempted to change the time zone rules 588# just in his city, in order to leave more summer time for the tourist trade. 589# The rule change lasted only part of the day; 590# the federal government refused to follow the city's rules, and business 591# was in a chaos, so the mayor backed down that afternoon. 592 593# From IATA SSIM (1996-02): 594# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 595# Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ), 596# Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO), 597# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 598# [The last three states are new to this issue of the IATA SSIM.] 599 600# From Gwillim Law (1996-10-07): 601# Geography, history (Tocantins was part of Goiás until 1989), and other 602# sources of time zone information lead me to believe that AL, SE, and TO were 603# always in BR1, and so the only change was whether or not they observed DST.... 604# The earliest issue of the SSIM I have is 2/91. Each issue from then until 605# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 606# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 607# (UTC-4).... The other two time zones given for Brazil are BR3, which is 608# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 609# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 610# become part of the state of Pernambuco). The boundary between BR1 and BR2 611# has never been clearly stated. They've simply been called East and West. 612# However, some conclusions can be drawn from another IATA manual: the Airline 613# Coding Directory, which lists close to 400 airports in Brazil. For each 614# airport it gives a time zone which is coded to the SSIM. From that 615# information, I'm led to conclude that the states of Amapá (AP), Ceará (CE), 616# Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do 617# Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST. 618 619# From Marcos Tadeu (1998-09-27): 620# Brazilian official page <http://pcdsh01.on.br/verao1.html> 621 622# From Jesper Nørgaard (2000-11-03): 623# [For an official list of which regions in Brazil use which time zones, see:] 624# http://pcdsh01.on.br/Fusbr.htm 625# http://pcdsh01.on.br/Fusbrhv.htm 626 627# From Celso Doria via David Madeo (2002-10-09): 628# The reason for the delay this year has to do with elections in Brazil. 629# 630# Unlike in the United States, elections in Brazil are 100% computerized and 631# the results are known almost immediately. Yesterday, it was the first 632# round of the elections when 115 million Brazilians voted for President, 633# Governor, Senators, Federal Deputies, and State Deputies. Nobody is 634# counting (or re-counting) votes anymore and we know there will be a second 635# round for the Presidency and also for some Governors. The 2nd round will 636# take place on October 27th. 637# 638# The reason why the DST will only begin November 3rd is that the thousands 639# of electoral machines used cannot have their time changed, and since the 640# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM, 641# the Government decided to postpone DST, instead of changing the Constitution 642# (maybe, for the next elections, it will be possible to change the clock)... 643 644# From Rodrigo Severo (2004-10-04): 645# It's just the biannual change made necessary by the much hyped, supposedly 646# modern Brazilian eletronic voting machines which, apparently, can't deal 647# with a time change between the first and the second rounds of the elections. 648 649# From Steffen Thorsen (2007-09-20): 650# Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: 651# http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975 652 653# From Paul Schulze (2008-06-24): 654# ...by law number 11.662 of April 24, 2008 (published in the "Diario 655# Oficial da União"...) in Brazil there are changes in the timezones, 656# effective today (00:00am at June 24, 2008) as follows: 657# 658# a) The timezone UTC+5 is extinguished, with all the Acre state and the 659# part of the Amazonas state that had this timezone now being put to the 660# timezone UTC+4 661# b) The whole Pará state now is put at timezone UTC+3, instead of just 662# part of it, as was before. 663# 664# This change follows a proposal of senator Tiao Viana of Acre state, that 665# proposed it due to concerns about open television channels displaying 666# programs inappropriate to youths in the states that had the timezone 667# UTC+5 too early in the night. In the occasion, some more corrections 668# were proposed, trying to unify the timezones of any given state. This 669# change modifies timezone rules defined in decree 2.784 of 18 June, 670# 1913. 671 672# From Rodrigo Severo (2008-06-24): 673# Just correcting the URL: 674# https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008 675# 676# As a result of the above Decree I believe the America/Rio_Branco 677# timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall 678# be created to represent the...west side of the Pará State. I 679# suggest this new timezone be called Santarem as the most 680# important/populated city in the affected area. 681# 682# This new timezone would be the same as the Rio_Branco timezone up to 683# the 2008/06/24 change which would be to UTC-3 instead of UTC-4. 684 685# From Alex Krivenyshev (2008-06-24): 686# This is a quick reference page for New and Old Brazil Time Zones map. 687# http://www.worldtimezone.com/brazil-time-new-old.php 688# 689# - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05 690# (state Acre and the part of the Amazonas will be UTC/GMT-04) - western 691# part of Par state is moving to one timezone UTC-03 (from UTC-04). 692 693# From Paul Eggert (2002-10-10): 694# The official decrees referenced below are mostly taken from 695# Decretos sobre o Horário de Verão no Brasil. 696# http://pcdsh01.on.br/DecHV.html 697 698# From Steffen Thorsen (2008-08-29): 699# As announced by the government and many newspapers in Brazil late 700# yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and 701# it will end on 2009-02-15 (current rule for Brazil is fine). Based on 702# past years experience with the elections, there was a good chance that 703# the start was postponed to November, but it did not happen this year. 704# 705# It has not yet been posted to http://pcdsh01.on.br/DecHV.html 706# 707# An official page about it: 708# http://www.mme.gov.br/site/news/detail.do?newsId=16722 709# Note that this link does not always work directly, but must be accessed 710# by going to 711# http://www.mme.gov.br/first 712# 713# One example link that works directly: 714# http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54 715# (Portuguese) 716# 717# We have a written a short article about it as well: 718# https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html 719# 720# From Alexander Krivenyshev (2011-10-04): 721# State Bahia will return to Daylight savings time this year after 8 years off. 722# The announcement was made by Governor Jaques Wagner in an interview to a 723# television station in Salvador. 724 725# In Portuguese: 726# http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html 727# https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html 728 729# From Guilherme Bernardes Rodrigues (2011-10-07): 730# There is news in the media, however there is still no decree about it. 731# I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the 732# official agency about time in Brazil, and she confirmed that the old rule is 733# still in force. 734 735# From Guilherme Bernardes Rodrigues (2011-10-14) 736# It's official, the President signed a decree that includes Bahia in summer 737# time. 738# [ and in a second message (same day): ] 739# I found the decree. 740# 741# DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011 742# Link : 743# http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6 744 745# From Kelley Cook (2012-10-16): 746# The governor of state of Bahia in Brazil announced on Thursday that 747# due to public pressure, he is reversing the DST policy they implemented 748# last year and will not be going to Summer Time on October 21st.... 749# http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia 750 751# From Rodrigo Severo (2012-10-16): 752# Tocantins state will have DST. 753# https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html 754 755# From Steffen Thorsen (2013-09-20): 756# Tocantins in Brazil is very likely not to observe DST from October.... 757# http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto 758# We will keep this article updated when this is confirmed: 759# https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html 760 761# From Steffen Thorsen (2013-10-17): 762# https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html 763# Senator Jorge Viana announced that Acre will change time zone on November 10. 764# He did not specify the time of the change, nor if western parts of Amazonas 765# will change as well. 766# 767# From Paul Eggert (2013-10-17): 768# For now, assume western Amazonas will change as well. 769 770# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 771# Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01) 772# Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10) 773Rule Brazil 1931 only - Oct 3 11:00 1:00 - 774Rule Brazil 1932 1933 - Apr 1 0:00 0 - 775Rule Brazil 1932 only - Oct 3 0:00 1:00 - 776# Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10) 777# revoked DST. 778# Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24) 779# Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13) 780Rule Brazil 1949 1952 - Dec 1 0:00 1:00 - 781Rule Brazil 1950 only - Apr 16 1:00 0 - 782Rule Brazil 1951 1952 - Apr 1 0:00 0 - 783# Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24) 784Rule Brazil 1953 only - Mar 1 0:00 0 - 785# Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30) 786# revoked DST. 787# Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18) 788# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 789# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 790# Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03) 791# extended the above decree to all of the national territory on 12-09. 792Rule Brazil 1963 only - Dec 9 0:00 1:00 - 793# Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25) 794# extended summer time by one day to 1964-03-01 00:00 (start of school). 795Rule Brazil 1964 only - Mar 1 0:00 0 - 796# Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27) 797Rule Brazil 1965 only - Jan 31 0:00 1:00 - 798Rule Brazil 1965 only - Mar 31 0:00 0 - 799# Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22) 800Rule Brazil 1965 only - Dec 1 0:00 1:00 - 801# Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18) 802Rule Brazil 1966 1968 - Mar 1 0:00 0 - 803Rule Brazil 1966 1967 - Nov 1 0:00 1:00 - 804# Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15) 805# revoked DST. 806# Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27) 807Rule Brazil 1985 only - Nov 2 0:00 1:00 - 808# Decree 92,310 (1986-01-21) 809# Decree 92,463 (1986-03-13) 810Rule Brazil 1986 only - Mar 15 0:00 0 - 811# Decree 93,316 (1986-10-01) 812Rule Brazil 1986 only - Oct 25 0:00 1:00 - 813Rule Brazil 1987 only - Feb 14 0:00 0 - 814# Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22) 815Rule Brazil 1987 only - Oct 25 0:00 1:00 - 816Rule Brazil 1988 only - Feb 7 0:00 0 - 817# Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12) 818# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 819Rule Brazil 1988 only - Oct 16 0:00 1:00 - 820Rule Brazil 1989 only - Jan 29 0:00 0 - 821# Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21) 822# with the same exceptions 823Rule Brazil 1989 only - Oct 15 0:00 1:00 - 824Rule Brazil 1990 only - Feb 11 0:00 0 - 825# Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17) 826# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 827# Decree 99,629 (1990-10-19) adds BA, MT. 828Rule Brazil 1990 only - Oct 21 0:00 1:00 - 829Rule Brazil 1991 only - Feb 17 0:00 0 - 830# Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25) 831# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 832Rule Brazil 1991 only - Oct 20 0:00 1:00 - 833Rule Brazil 1992 only - Feb 9 0:00 0 - 834# Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16) 835# adopted by same states. 836Rule Brazil 1992 only - Oct 25 0:00 1:00 - 837Rule Brazil 1993 only - Jan 31 0:00 0 - 838# Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28) 839# adopted by same states, plus AM. 840# Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22; 841# web page corrected 2004-01-07) adopted by same states, minus AM. 842# Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14) 843# adopted by same states, plus MT and TO. 844# Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13) 845# adds AL, SE. 846Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 - 847Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 848Rule Brazil 1996 only - Feb 11 0:00 0 - 849# Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04) 850# adopted by same states, minus AL, SE. 851Rule Brazil 1996 only - Oct 6 0:00 1:00 - 852Rule Brazil 1997 only - Feb 16 0:00 0 - 853# From Daniel C. Sobral (1998-02-12): 854# In 1997, the DS began on October 6. The stated reason was that 855# because international television networks ignored Brazil's policy on DS, 856# they bought the wrong times on satellite for coverage of Pope's visit. 857# This year, the ending date of DS was postponed to March 1 858# to help dealing with the shortages of electric power. 859# 860# Decree 2,317 (1997-09-04), adopted by same states. 861Rule Brazil 1997 only - Oct 6 0:00 1:00 - 862# Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG> 863# (1998-02-10) 864Rule Brazil 1998 only - Mar 1 0:00 0 - 865# Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11) 866# adopted by the same states as before. 867Rule Brazil 1998 only - Oct 11 0:00 1:00 - 868Rule Brazil 1999 only - Feb 21 0:00 0 - 869# Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif> 870# (1999-08-23) adopted by same states. 871# Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30) 872# adds SE, AL, PB, PE, RN, CE, PI, MA and RR. 873Rule Brazil 1999 only - Oct 3 0:00 1:00 - 874Rule Brazil 2000 only - Feb 27 0:00 0 - 875# Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06) 876# adopted by the same states as before. 877# Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13) 878# repeals DST in PE and RR, effective 2000-10-15 00:00. 879# Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17) 880# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. 881# Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif> 882# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE. 883Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 - 884Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 - 885# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE. 886# 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm> 887Rule Brazil 2002 only - Nov 3 0:00 1:00 - 888# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. 889# 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm> 890Rule Brazil 2003 only - Oct 19 0:00 1:00 - 891# Decree 5,223 (2004-10-01) reestablishes DST in MT. 892# 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm> 893Rule Brazil 2004 only - Nov 2 0:00 1:00 - 894# Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19), 895# adopted by the same states as before. 896Rule Brazil 2005 only - Oct 16 0:00 1:00 - 897# Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03), 898# adopted by the same states as before. 899Rule Brazil 2006 only - Nov 5 0:00 1:00 - 900Rule Brazil 2007 only - Feb 25 0:00 0 - 901# Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26), 902# adopted by the same states as before. 903Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 - 904# From Frederico A. C. Neves (2008-09-10): 905# According to this decree 906# http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm 907# [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the 908# 3rd Feb Sunday. There is an exception on the return date when this is 909# the Carnival Sunday then the return date will be the next Sunday... 910Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 - 911Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - 912# Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13) 913# added Bahia. 914Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - 915# Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15) 916# removed Bahia and added Tocantins. 917# Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30) 918# removed Tocantins. 919Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - 920Rule Brazil 2015 only - Feb Sun>=22 0:00 0 - 921Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 - 922# From Steffen Thorsen (2017-12-18): 923# According to many media sources, next year's DST start in Brazil will move to 924# the first Sunday of November, and it will stay like that for the years after. 925# ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html 926# From Steffen Thorsen (2017-12-20): 927# http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm 928Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 - 929Rule Brazil 2023 only - Feb Sun>=22 0:00 0 - 930Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 - 931Rule Brazil 2026 only - Feb Sun>=22 0:00 0 - 932Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 - 933Rule Brazil 2034 only - Feb Sun>=22 0:00 0 - 934Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 - 935Rule Brazil 2037 only - Feb Sun>=22 0:00 0 - 936# From Arthur David Olson (2008-09-29): 937# The next is wrong in some years but is better than nothing. 938Rule Brazil 2038 max - Feb Sun>=15 0:00 0 - 939 940# The latest ruleset listed above says that the following states observe DST: 941# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. 942 943# Zone NAME GMTOFF RULES FORMAT [UNTIL] 944# 945# Fernando de Noronha (administratively part of PE) 946Zone America/Noronha -2:09:40 - LMT 1914 947 -2:00 Brazil -02/-01 1990 Sep 17 948 -2:00 - -02 1999 Sep 30 949 -2:00 Brazil -02/-01 2000 Oct 15 950 -2:00 - -02 2001 Sep 13 951 -2:00 Brazil -02/-01 2002 Oct 1 952 -2:00 - -02 953# Other Atlantic islands have no permanent settlement. 954# These include Trindade and Martim Vaz (administratively part of ES), 955# Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE). 956# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; 957# it also included the Penedos. 958# 959# Amapá (AP), east Pará (PA) 960# East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu. 961# The division between east and west Pará is the river Xingu. 962# In the north a very small part from the river Javary (now Jari I guess, 963# the border with Amapá) to the Amazon, then to the Xingu. 964Zone America/Belem -3:13:56 - LMT 1914 965 -3:00 Brazil -03/-02 1988 Sep 12 966 -3:00 - -03 967# 968# west Pará (PA) 969# West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém. 970Zone America/Santarem -3:38:48 - LMT 1914 971 -4:00 Brazil -04/-03 1988 Sep 12 972 -4:00 - -04 2008 Jun 24 0:00 973 -3:00 - -03 974# 975# Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN), 976# Paraíba (PB) 977Zone America/Fortaleza -2:34:00 - LMT 1914 978 -3:00 Brazil -03/-02 1990 Sep 17 979 -3:00 - -03 1999 Sep 30 980 -3:00 Brazil -03/-02 2000 Oct 22 981 -3:00 - -03 2001 Sep 13 982 -3:00 Brazil -03/-02 2002 Oct 1 983 -3:00 - -03 984# 985# Pernambuco (PE) (except Atlantic islands) 986Zone America/Recife -2:19:36 - LMT 1914 987 -3:00 Brazil -03/-02 1990 Sep 17 988 -3:00 - -03 1999 Sep 30 989 -3:00 Brazil -03/-02 2000 Oct 15 990 -3:00 - -03 2001 Sep 13 991 -3:00 Brazil -03/-02 2002 Oct 1 992 -3:00 - -03 993# 994# Tocantins (TO) 995Zone America/Araguaina -3:12:48 - LMT 1914 996 -3:00 Brazil -03/-02 1990 Sep 17 997 -3:00 - -03 1995 Sep 14 998 -3:00 Brazil -03/-02 2003 Sep 24 999 -3:00 - -03 2012 Oct 21 1000 -3:00 Brazil -03/-02 2013 Sep 1001 -3:00 - -03 1002# 1003# Alagoas (AL), Sergipe (SE) 1004Zone America/Maceio -2:22:52 - LMT 1914 1005 -3:00 Brazil -03/-02 1990 Sep 17 1006 -3:00 - -03 1995 Oct 13 1007 -3:00 Brazil -03/-02 1996 Sep 4 1008 -3:00 - -03 1999 Sep 30 1009 -3:00 Brazil -03/-02 2000 Oct 22 1010 -3:00 - -03 2001 Sep 13 1011 -3:00 Brazil -03/-02 2002 Oct 1 1012 -3:00 - -03 1013# 1014# Bahia (BA) 1015# There are too many Salvadors elsewhere, so use America/Bahia instead 1016# of America/Salvador. 1017Zone America/Bahia -2:34:04 - LMT 1914 1018 -3:00 Brazil -03/-02 2003 Sep 24 1019 -3:00 - -03 2011 Oct 16 1020 -3:00 Brazil -03/-02 2012 Oct 21 1021 -3:00 - -03 1022# 1023# Goiás (GO), Distrito Federal (DF), Minas Gerais (MG), 1024# Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR), 1025# Santa Catarina (SC), Rio Grande do Sul (RS) 1026Zone America/Sao_Paulo -3:06:28 - LMT 1914 1027 -3:00 Brazil -03/-02 1963 Oct 23 0:00 1028 -3:00 1:00 -02 1964 1029 -3:00 Brazil -03/-02 1030# 1031# Mato Grosso do Sul (MS) 1032Zone America/Campo_Grande -3:38:28 - LMT 1914 1033 -4:00 Brazil -04/-03 1034# 1035# Mato Grosso (MT) 1036Zone America/Cuiaba -3:44:20 - LMT 1914 1037 -4:00 Brazil -04/-03 2003 Sep 24 1038 -4:00 - -04 2004 Oct 1 1039 -4:00 Brazil -04/-03 1040# 1041# Rondônia (RO) 1042Zone America/Porto_Velho -4:15:36 - LMT 1914 1043 -4:00 Brazil -04/-03 1988 Sep 12 1044 -4:00 - -04 1045# 1046# Roraima (RR) 1047Zone America/Boa_Vista -4:02:40 - LMT 1914 1048 -4:00 Brazil -04/-03 1988 Sep 12 1049 -4:00 - -04 1999 Sep 30 1050 -4:00 Brazil -04/-03 2000 Oct 15 1051 -4:00 - -04 1052# 1053# east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto 1054# The great circle line from Tabatinga to Porto Acre divides 1055# east from west Amazonas. 1056Zone America/Manaus -4:00:04 - LMT 1914 1057 -4:00 Brazil -04/-03 1988 Sep 12 1058 -4:00 - -04 1993 Sep 28 1059 -4:00 Brazil -04/-03 1994 Sep 22 1060 -4:00 - -04 1061# 1062# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, 1063# Eirunepé, Envira, Ipixuna 1064Zone America/Eirunepe -4:39:28 - LMT 1914 1065 -5:00 Brazil -05/-04 1988 Sep 12 1066 -5:00 - -05 1993 Sep 28 1067 -5:00 Brazil -05/-04 1994 Sep 22 1068 -5:00 - -05 2008 Jun 24 0:00 1069 -4:00 - -04 2013 Nov 10 1070 -5:00 - -05 1071# 1072# Acre (AC) 1073Zone America/Rio_Branco -4:31:12 - LMT 1914 1074 -5:00 Brazil -05/-04 1988 Sep 12 1075 -5:00 - -05 2008 Jun 24 0:00 1076 -4:00 - -04 2013 Nov 10 1077 -5:00 - -05 1078 1079# Chile 1080 1081# From Paul Eggert (2015-04-03): 1082# Shanks & Pottenger says America/Santiago introduced standard time in 1083# 1890 and rounds its UT offset to 70W40; guess that in practice this 1084# was the same offset as in 1916-1919. It also says Pacific/Easter 1085# standardized on 109W22 in 1890; assume this didn't change the clocks. 1086# 1087# Dates for America/Santiago from 1910 to 2004 are primarily from 1088# the following source, cited by Oscar van Vlijmen (2006-10-08): 1089# [1] Chile Law 1090# http://www.webexhibits.org/daylightsaving/chile.html 1091# This contains a copy of this official table: 1092# Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30) 1093# https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm 1094# [1] needs several corrections, though. 1095# 1096# The first set of corrections is from: 1097# [2] History of the Official Time of Chile 1098# http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See: 1099# https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html 1100# This is an English translation of: 1101# Historia de la hora oficial de Chile (retrieved 2012-10-24). See: 1102# https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm 1103# A fancier Spanish version (requiring mouse-clicking) is at: 1104# http://www.horaoficial.cl/historia_hora.html 1105# Conflicts between [1] and [2] were resolved as follows: 1106# 1107# - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites 1108# Boletín No. 1, Aviso No. 1 (1910). Go with [2]. 1109# 1110# - [1] says SMT was -4:42:45, [2] says Chile's official time from 1111# 1916 to 1919 was -4:42:46.3, the meridian of Chile's National 1112# Astronomical Observatory (OAN), then located in what is now 1113# Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46. 1114# 1115# - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites 1116# Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2]. 1117# 1118# - [1] does not give times for transitions; assume they occur 1119# at midnight mainland time, the current common practice. However, 1120# go with [2]'s specification of 23:00 for the 1947-05-21 transition. 1121# 1122# Another correction to [1] is from Jesper Nørgaard Welen, who 1123# wrote (2006-10-08), "I think that there are some obvious mistakes in 1124# the suggested link from Oscar van Vlijmen,... for instance entry 66 1125# says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at 1126# 1990-09-15 (they should have been 1990-09-15 and 1990-09-16 1127# respectively), but anyhow it clears up some doubts too." 1128# 1129# Data for Pacific/Easter from 1910 through 1967 come from Shanks & 1130# Pottenger. After that, for lack of better info assume 1131# Pacific/Easter is always two hours behind America/Santiago; 1132# this is known to work for DST transitions starting in 2008 and 1133# may well be true for earlier transitions. 1134 1135# From Eduardo Krell (1995-10-19): 1136# The law says to switch to DST at midnight [24:00] on the second SATURDAY 1137# of October.... The law is the same for March and October. 1138# (1998-09-29): 1139# Because of the drought this year, the government decided to go into 1140# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 1141# (unless there's another dry season next year, I guess). 1142 1143# From Julio I. Pacheco Troncoso (1999-03-18): 1144# Because of the same drought, the government decided to end DST later, 1145# on April 3, (one-time change). 1146 1147# From Germán Poo-Caamaño (2008-03-03): 1148# Due to drought, Chile extends Daylight Time in three weeks. This 1149# is one-time change (Saturday 3/29 at 24:00 for America/Santiago 1150# and Saturday 3/29 at 22:00 for Pacific/Easter) 1151# The Supreme Decree is located at 1152# http://www.shoa.cl/servicios/supremo316.pdf 1153# 1154# From José Miguel Garrido (2008-03-05): 1155# http://www.shoa.cl/noticias/2008/04hora/hora.htm 1156 1157# From Angel Chiang (2010-03-04): 1158# Subject: DST in Chile exceptionally extended to 3 April due to earthquake 1159# http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098 1160# 1161# From Arthur David Olson (2010-03-06): 1162# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch. 1163 1164# From Glenn Eychaner (2011-03-28): 1165# http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E} 1166# In English: 1167# Chile's clocks will go back an hour this year on the 7th of May instead 1168# of this Saturday. They will go forward again the 3rd Saturday in 1169# August, not in October as they have since 1968. 1170 1171# From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23): 1172# As stated in the website of the Chilean Energy Ministry 1173# http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html 1174# The Chilean Government has decided to postpone the entrance into winter time 1175# (to leave DST) from March 11 2012 to April 28th 2012.... 1176# Quote from the website communication: 1177# 1178# 6. For the year 2012, the dates of entry into winter time will be as follows: 1179# a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at 1180# 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00 1181# of the same day. 1182# b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is, 1183# at 23:59:59, instead of passing to 0:00, the time should be adjusted to be 1184# 01:00 on September 2. 1185 1186# From Steffen Thorsen (2013-02-15): 1187# According to several news sources, Chile has extended DST this year, 1188# they will end DST later and start DST earlier than planned. They 1189# hope to save energy. The new end date is 2013-04-28 00:00 and new 1190# start date is 2013-09-08 00:00.... 1191# http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm 1192 1193# From José Miguel Garrido (2014-02-19): 1194# Today appeared in the Diario Oficial a decree amending the time change 1195# dates to 2014. 1196# DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC) 1197# DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC) 1198# http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf 1199 1200# From Eduardo Romero Urra (2015-03-03): 1201# Today has been published officially that Chile will use the DST time 1202# permanently until March 25 of 2017 1203# http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg 1204# 1205# From Paul Eggert (2015-03-03): 1206# For now, assume that the extension will persist indefinitely. 1207 1208# From Juan Correa (2016-03-18): 1209# The decree regarding DST has been published in today's Official Gazette: 1210# http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/ 1211# http://www.leychile.cl/Navegar?idNorma=1088502 1212# It does consider the second Saturday of May and August as the dates 1213# for the transition; and it lists DST dates until 2019, but I think 1214# this scheme will stick. 1215# 1216# From Paul Eggert (2016-03-18): 1217# For now, assume the pattern holds for the indefinite future. 1218# The decree says transitions occur at 24:00; in practice this appears 1219# to mean 24:00 mainland time, not 24:00 local time, so that Easter 1220# Island is always two hours behind the mainland. 1221 1222# From Juan Correa (2016-12-04): 1223# Magallanes region ... will keep DST (UTC -3) all year round.... 1224# 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 1225# 1226# From Deborah Goldsmith (2017-01-19): 1227# http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf 1228# From Paul Eggert (2017-01-19): 1229# The above says the Magallanes change expires 2019-05-11 at 24:00, 1230# so in theory, they will revert to -04/-03 after that, which means 1231# they will switch from -03 to -04 one hour after Santiago does that day. 1232# For now, assume that they will not revert. 1233 1234# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1235Rule Chile 1927 1931 - Sep 1 0:00 1:00 - 1236Rule Chile 1928 1932 - Apr 1 0:00 0 - 1237Rule Chile 1968 only - Nov 3 4:00u 1:00 - 1238Rule Chile 1969 only - Mar 30 3:00u 0 - 1239Rule Chile 1969 only - Nov 23 4:00u 1:00 - 1240Rule Chile 1970 only - Mar 29 3:00u 0 - 1241Rule Chile 1971 only - Mar 14 3:00u 0 - 1242Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 - 1243Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - 1244Rule Chile 1973 only - Sep 30 4:00u 1:00 - 1245Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 - 1246Rule Chile 1987 only - Apr 12 3:00u 0 - 1247Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 - 1248Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 - 1249Rule Chile 1990 only - Sep 16 4:00u 1:00 - 1250Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - 1251Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 - 1252Rule Chile 1997 only - Mar 30 3:00u 0 - 1253Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - 1254Rule Chile 1998 only - Sep 27 4:00u 1:00 - 1255Rule Chile 1999 only - Apr 4 3:00u 0 - 1256Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 - 1257Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 - 1258# N.B.: the end of March 29 in Chile is March 30 in Universal time, 1259# which is used below in specifying the transition. 1260Rule Chile 2008 only - Mar 30 3:00u 0 - 1261Rule Chile 2009 only - Mar Sun>=9 3:00u 0 - 1262Rule Chile 2010 only - Apr Sun>=1 3:00u 0 - 1263Rule Chile 2011 only - May Sun>=2 3:00u 0 - 1264Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 - 1265Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 - 1266Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 - 1267Rule Chile 2016 max - May Sun>=9 3:00u 0 - 1268Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 - 1269# IATA SSIM anomalies: (1992-02) says 1992-03-14; 1270# (1996-09) says 1998-03-08. Ignore these. 1271# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1272Zone America/Santiago -4:42:46 - LMT 1890 1273 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time 1274 -5:00 - -05 1916 Jul 1 1275 -4:42:46 - SMT 1918 Sep 10 1276 -4:00 - -04 1919 Jul 1 1277 -4:42:46 - SMT 1927 Sep 1 1278 -5:00 Chile -05/-04 1932 Sep 1 1279 -4:00 - -04 1942 Jun 1 1280 -5:00 - -05 1942 Aug 1 1281 -4:00 - -04 1946 Jul 15 1282 -4:00 1:00 -03 1946 Sep 1 # central Chile 1283 -4:00 - -04 1947 Apr 1 1284 -5:00 - -05 1947 May 21 23:00 1285 -4:00 Chile -04/-03 1286Zone America/Punta_Arenas -4:43:40 - LMT 1890 1287 -4:42:46 - SMT 1910 Jan 10 1288 -5:00 - -05 1916 Jul 1 1289 -4:42:46 - SMT 1918 Sep 10 1290 -4:00 - -04 1919 Jul 1 1291 -4:42:46 - SMT 1927 Sep 1 1292 -5:00 Chile -05/-04 1932 Sep 1 1293 -4:00 - -04 1942 Jun 1 1294 -5:00 - -05 1942 Aug 1 1295 -4:00 - -04 1947 Apr 1 1296 -5:00 - -05 1947 May 21 23:00 1297 -4:00 Chile -04/-03 2016 Dec 4 1298 -3:00 - -03 1299Zone Pacific/Easter -7:17:28 - LMT 1890 1300 -7:17:28 - EMT 1932 Sep # Easter Mean Time 1301 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time 1302 -6:00 Chile -06/-05 1303# 1304# Salas y Gómez Island is uninhabited. 1305# Other Chilean locations, including Juan Fernández Is, Desventuradas Is, 1306# and Antarctic bases, are like America/Santiago. 1307 1308# Antarctic base using South American rules 1309# (See the file 'antarctica' for more.) 1310# 1311# Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) 1312# 1313# From Ethan Dicks (1996-10-06): 1314# It keeps the same time as Punta Arenas, Chile, because, just like us 1315# and the South Pole, that's the other end of their supply line.... 1316# I verified with someone who was there that since 1980, 1317# Palmer has followed Chile. Prior to that, before the Falklands War, 1318# Palmer used to be supplied from Argentina. 1319# 1320# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1321Zone Antarctica/Palmer 0 - -00 1965 1322 -4:00 Arg -04/-03 1969 Oct 5 1323 -3:00 Arg -03/-02 1982 May 1324 -4:00 Chile -04/-03 2016 Dec 4 1325 -3:00 - -03 1326 1327# Colombia 1328 1329# Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes, 1330# "A variation of fifteen minutes in the public clocks of Bogota is not rare." 1331 1332# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1333Rule CO 1992 only - May 3 0:00 1:00 - 1334Rule CO 1993 only - Apr 4 0:00 0 - 1335# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1336Zone America/Bogota -4:56:16 - LMT 1884 Mar 13 1337 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time 1338 -5:00 CO -05/-04 1339# Malpelo, Providencia, San Andres 1340# no information; probably like America/Bogota 1341 1342# Curaçao 1343 1344# Milne gives 4:35:46.9 for Curaçao mean time; round to nearest. 1345# 1346# From Paul Eggert (2006-03-22): 1347# Shanks & Pottenger say that The Bottom and Philipsburg have been at 1348# -4:00 since standard time was introduced on 1912-03-02; and that 1349# Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from 1350# 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say 1351# Saba Island has been like Curaçao. 1352# This all predates our 1970 cutoff, though. 1353# 1354# By July 2007 Curaçao and St Maarten are planned to become 1355# associated states within the Netherlands, much like Aruba; 1356# Bonaire, Saba and St Eustatius would become directly part of the 1357# Netherlands as Kingdom Islands. This won't affect their time zones 1358# though, as far as we know. 1359# 1360# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1361Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad 1362 -4:30 - -0430 1965 1363 -4:00 - AST 1364 1365# From Arthur David Olson (2011-06-15): 1366# use links for places with new iso3166 codes. 1367# The name "Lower Prince's Quarter" is both longer than fourteen characters 1368# and contains an apostrophe; use "Lower_Princes" below. 1369 1370Link America/Curacao America/Lower_Princes # Sint Maarten 1371Link America/Curacao America/Kralendijk # Caribbean Netherlands 1372 1373# Ecuador 1374# 1375# Milne says the Central and South American Telegraph Company used -5:24:15. 1376# 1377# From Alois Treindl (2016-12-15): 1378# https://www.elcomercio.com/actualidad/hora-sixto-1993.html 1379# ... Whether the law applied also to Galápagos, I do not know. 1380# From Paul Eggert (2016-12-15): 1381# https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html 1382# This says President Sixto Durán Ballén signed decree No. 285, which 1383# established DST from 1992-11-28 to 1993-02-05; it does not give transition 1384# times. The people called it "hora de Sixto" ("Sixto hour"). The change did 1385# not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics 1386# that included "Amanecía en mitad de la noche, los guaguas iban a clase sin 1387# sol" ("It was dawning in the middle of the night, the buses went to class 1388# without sun"). Although Ballén's campaign slogan was "Ni un paso atrás" 1389# (Not one step back), the clocks went back in 1993 and the experiment was not 1390# repeated. For now, assume transitions were at 00:00 local time country-wide. 1391# 1392# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1393Rule Ecuador 1992 only - Nov 28 0:00 1:00 - 1394Rule Ecuador 1993 only - Feb 5 0:00 0 - 1395# 1396# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1397Zone America/Guayaquil -5:19:20 - LMT 1890 1398 -5:14:00 - QMT 1931 # Quito Mean Time 1399 -5:00 Ecuador -05/-04 1400Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 1401 -5:00 - -05 1986 1402 -6:00 Ecuador -06/-05 1403 1404# Falklands 1405 1406# From Paul Eggert (2006-03-22): 1407# Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except 1408# the IATA gives 1996-09-08. Go with Shanks & Pottenger. 1409 1410# From Falkland Islands Government Office, London (2001-01-22) 1411# via Jesper Nørgaard: 1412# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15 1413# April 2001 and advance one hour to summer time at 2 am on Sunday 2 1414# September. It is anticipated that the clocks will revert back at 2 1415# am on Sunday 21 April 2002 and advance to summer time at 2 am on 1416# Sunday 1 September. 1417 1418# From Rives McDow (2001-02-13): 1419# 1420# I have communicated several times with people there, and the last 1421# time I had communications that was helpful was in 1998. Here is 1422# what was said then: 1423# 1424# "The general rule was that Stanley used daylight saving and the Camp 1425# did not. However for various reasons many people in the Camp have 1426# started to use daylight saving (known locally as 'Stanley Time') 1427# There is no rule as to who uses daylight saving - it is a matter of 1428# personal choice and so it is impossible to draw a map showing who 1429# uses it and who does not. Any list would be out of date as soon as 1430# it was produced. This year daylight saving ended on April 18/19th 1431# and started again on September 12/13th. I do not know what the rule 1432# is, but can find out if you like. We do not change at the same time 1433# as UK or Chile." 1434# 1435# I did have in my notes that the rule was "Second Saturday in Sep at 1436# 0:00 until third Saturday in Apr at 0:00". I think that this does 1437# not agree in some cases with Shanks; is this true? 1438# 1439# Also, there is no mention in the list that some areas in the 1440# Falklands do not use DST. I have found in my communications there 1441# that these areas are on the western half of East Falkland and all of 1442# West Falkland. Stanley is the only place that consistently observes 1443# DST. Again, as in other places in the world, the farmers don't like 1444# it. West Falkland is almost entirely sheep farmers. 1445# 1446# I know one lady there that keeps a list of which farm keeps DST and 1447# which doesn't each year. She runs a shop in Stanley, and says that 1448# the list changes each year. She uses it to communicate to her 1449# customers, catching them when they are home for lunch or dinner. 1450 1451# From Paul Eggert (2001-03-05): 1452# For now, we'll just record the time in Stanley, since we have no 1453# better info. 1454 1455# From Steffen Thorsen (2011-04-01): 1456# The Falkland Islands will not turn back clocks this winter, but stay on 1457# daylight saving time. 1458# 1459# One source: 1460# http://www.falklandnews.com/public/story.cfm?get=5914&source=3 1461# 1462# We have gotten this confirmed by a clerk of the legislative assembly: 1463# Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the 1464# third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3 1465# hours) on the first Sunday of September at 0200hrs. 1466# 1467# IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands 1468# will not revert to local mean time, but clocks will remain on Summer 1469# time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term 1470# change to local time following the trial period will be notified. 1471# 1472# From Andrew Newman (2012-02-24) 1473# A letter from Justin McPhee, Chief Executive, 1474# Cable & Wireless Falkland Islands (dated 2012-02-22) 1475# states... 1476# The current Atlantic/Stanley entry under South America expects the 1477# clocks to go back to standard Falklands Time (FKT) on the 15th April. 1478# The database entry states that in 2011 Stanley was staying on fixed 1479# summer time on a trial basis only. FIG need to contact IANA and/or 1480# the maintainers of the database to inform them we're adopting 1481# the same policy this year and suggest recommendations for future years. 1482# 1483# For now we will assume permanent -03 for the Falklands 1484# until advised differently (to apply for 2012 and beyond, after the 2011 1485# experiment was apparently successful.) 1486# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1487Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 - 1488Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 1489Rule Falk 1939 only - Oct 1 0:00 1:00 - 1490Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 - 1491Rule Falk 1943 only - Jan 1 0:00 0 - 1492Rule Falk 1983 only - Sep lastSun 0:00 1:00 - 1493Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 1494Rule Falk 1984 only - Sep 16 0:00 1:00 - 1495Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 - 1496Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 - 1497Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 - 1498Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 - 1499# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1500Zone Atlantic/Stanley -3:51:24 - LMT 1890 1501 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 1502 -4:00 Falk -04/-03 1983 May 1503 -3:00 Falk -03/-02 1985 Sep 15 1504 -4:00 Falk -04/-03 2010 Sep 5 2:00 1505 -3:00 - -03 1506 1507# French Guiana 1508# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1509Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1510 -4:00 - -04 1967 Oct 1511 -3:00 - -03 1512 1513# Guyana 1514# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1515Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 1516 -3:45 - -0345 1975 Jul 31 1517 -3:00 - -03 1991 1518# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch. 1519 -4:00 - -04 1520 1521# Paraguay 1522# 1523# From Paul Eggert (2006-03-22): 1524# Shanks & Pottenger say that spring transitions are 01:00 -> 02:00, 1525# and autumn transitions are 00:00 -> 23:00. Go with pre-1999 1526# editions of Shanks, and with the IATA, who say transitions occur at 00:00. 1527# 1528# From Waldemar Villamayor-Venialbo (2013-09-20): 1529# No time of the day is established for the adjustment, so people normally 1530# adjust their clocks at 0 hour of the given dates. 1531# 1532# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1533Rule Para 1975 1988 - Oct 1 0:00 1:00 - 1534Rule Para 1975 1978 - Mar 1 0:00 0 - 1535Rule Para 1979 1991 - Apr 1 0:00 0 - 1536Rule Para 1989 only - Oct 22 0:00 1:00 - 1537Rule Para 1990 only - Oct 1 0:00 1:00 - 1538Rule Para 1991 only - Oct 6 0:00 1:00 - 1539Rule Para 1992 only - Mar 1 0:00 0 - 1540Rule Para 1992 only - Oct 5 0:00 1:00 - 1541Rule Para 1993 only - Mar 31 0:00 0 - 1542Rule Para 1993 1995 - Oct 1 0:00 1:00 - 1543Rule Para 1994 1995 - Feb lastSun 0:00 0 - 1544Rule Para 1996 only - Mar 1 0:00 0 - 1545# IATA SSIM (2000-02) says 1999-10-10; ignore this for now. 1546# From Steffen Thorsen (2000-10-02): 1547# I have three independent reports that Paraguay changed to DST this Sunday 1548# (10-01). 1549# 1550# Translated by Gwillim Law (2001-02-27) from 1551# Noticias, a daily paper in Asunción, Paraguay (2000-10-01): 1552# http://www.diarionoticias.com.py/011000/nacional/naciona1.htm 1553# Starting at 0:00 today, the clock will be set forward 60 minutes, in 1554# fulfillment of Decree No. 7,273 of the Executive Power.... The time change 1555# system has been operating for several years. Formerly there was a separate 1556# decree each year; the new law has the same effect, but permanently. Every 1557# year, the time will change on the first Sunday of October; likewise, the 1558# clock will be set back on the first Sunday of March. 1559# 1560Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 - 1561# IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger. 1562Rule Para 1997 only - Feb lastSun 0:00 0 - 1563# Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but 1564# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27). 1565Rule Para 1998 2001 - Mar Sun>=1 0:00 0 - 1566# From Rives McDow (2002-02-28): 1567# A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the 1568# dst method to be from the first Sunday in September to the first Sunday in 1569# April. 1570Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - 1571Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 - 1572# 1573# From Jesper Nørgaard Welen (2005-01-02): 1574# There are several sources that claim that Paraguay made 1575# a timezone rule change in autumn 2004. 1576# From Steffen Thorsen (2005-01-05): 1577# Decree 1,867 (2004-03-05) 1578# From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13) 1579# http://www.presidencia.gov.py/decretos/D1867.pdf 1580Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 - 1581Rule Para 2005 2009 - Mar Sun>=8 0:00 0 - 1582# From Carlos Raúl Perasso (2010-02-18): 1583# By decree number 3958 issued yesterday 1584# http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf 1585# Paraguay changes its DST schedule, postponing the March rule to April and 1586# modifying the October date. The decree reads: 1587# ... 1588# Art. 1. It is hereby established that from the second Sunday of the month of 1589# April of this year (2010), the official time is to be set back 60 minutes, 1590# and that on the first Sunday of the month of October, it is to be set 1591# forward 60 minutes, in all the territory of the Paraguayan Republic. 1592# ... 1593Rule Para 2010 max - Oct Sun>=1 0:00 1:00 - 1594Rule Para 2010 2012 - Apr Sun>=8 0:00 0 - 1595# 1596# From Steffen Thorsen (2013-03-07): 1597# Paraguay will end DST on 2013-03-24 00:00.... 1598# http://www.ande.gov.py/interna.php?id=1075 1599# 1600# From Carlos Raúl Perasso (2013-03-15): 1601# The change in Paraguay is now final. Decree number 10780 1602# http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf 1603# From Carlos Raúl Perasso (2014-02-28): 1604# Decree 1264 can be found at: 1605# http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf 1606Rule Para 2013 max - Mar Sun>=22 0:00 0 - 1607 1608# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1609Zone America/Asuncion -3:50:40 - LMT 1890 1610 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time 1611 -4:00 - -04 1972 Oct 1612 -3:00 - -03 1974 Apr 1613 -4:00 Para -04/-03 1614 1615# Peru 1616# 1617# From Evelyn C. Leeper via Mark Brader (2003-10-26) 1618# <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>: 1619# When we were in Peru in 1985-1986, they apparently switched over 1620# sometime between December 29 and January 3 while we were on the Amazon. 1621# 1622# From Paul Eggert (2006-03-22): 1623# Shanks & Pottenger don't have this transition. Assume 1986 was like 1987. 1624 1625# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1626Rule Peru 1938 only - Jan 1 0:00 1:00 - 1627Rule Peru 1938 only - Apr 1 0:00 0 - 1628Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 - 1629Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 1630Rule Peru 1986 1987 - Jan 1 0:00 1:00 - 1631Rule Peru 1986 1987 - Apr 1 0:00 0 - 1632Rule Peru 1990 only - Jan 1 0:00 1:00 - 1633Rule Peru 1990 only - Apr 1 0:00 0 - 1634# IATA is ambiguous for 1993/1995; go with Shanks & Pottenger. 1635Rule Peru 1994 only - Jan 1 0:00 1:00 - 1636Rule Peru 1994 only - Apr 1 0:00 0 - 1637# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1638Zone America/Lima -5:08:12 - LMT 1890 1639 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time? 1640 -5:00 Peru -05/-04 1641 1642# South Georgia 1643# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1644Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 1645 -2:00 - -02 1646 1647# South Sandwich Is 1648# uninhabited; scientific personnel have wintered 1649 1650# Suriname 1651# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1652Zone America/Paramaribo -3:40:40 - LMT 1911 1653 -3:40:52 - PMT 1935 # Paramaribo Mean Time 1654 -3:40:36 - PMT 1945 Oct # The capital moved? 1655 -3:30 - -0330 1984 Oct 1656 -3:00 - -03 1657 1658# Trinidad and Tobago 1659# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1660Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 1661 -4:00 - AST 1662 1663# These all agree with Trinidad and Tobago since 1970. 1664Link America/Port_of_Spain America/Anguilla 1665Link America/Port_of_Spain America/Antigua 1666Link America/Port_of_Spain America/Dominica 1667Link America/Port_of_Spain America/Grenada 1668Link America/Port_of_Spain America/Guadeloupe 1669Link America/Port_of_Spain America/Marigot # St Martin (French part) 1670Link America/Port_of_Spain America/Montserrat 1671Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy 1672Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis 1673Link America/Port_of_Spain America/St_Lucia 1674Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US) 1675Link America/Port_of_Spain America/St_Vincent 1676Link America/Port_of_Spain America/Tortola # Virgin Islands (UK) 1677 1678# Uruguay 1679# From Paul Eggert (1993-11-18): 1680# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 1681# 1682# From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael 1683# Deckers (2018-02-20): 1684# ... At least they kept good records... 1685# 1686# http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36 1687# Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and 1688# Meteorology Service of the Uruguayan Navy, seems to give many transitions 1689# with greater clarity than we've had before. It directly references many laws 1690# and decrees which are, in turn, referenced below. They can be viewed in the 1691# public archives of the Diario Oficial (in Spanish) at 1692# http://www.impo.com.uy/diariooficial/ 1693# 1694# Ley No. 3920 of 1908-06-10 placed the determination of legal time under the 1695# auspices of the National Institute for the Prediction of Time. It is unclear 1696# exactly what offset was used during this period, though Ley No. 7200 of 1697# 1920-04-23 used the Observatory of the National Meteorological Institute in 1698# Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian, 1699# retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00, 1700# resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on 1701# page 725 of the Proceedings of the Second Pan-American Scientific Congress, 1702# 1915-1916) was in use, and merely became official from 1908-06-10. 1703# https://www.impo.com.uy/diariooficial/1908/06/18/12 1704# https://www.impo.com.uy/diariooficial/1920/04/27/9 1705# 1706# Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced 1707# by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14 1708# minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the 1709# National Council of Administration the same day, published directly below the 1710# law in the Diario Oficial, specified the first transition to be 1923-09-30 1711# 24:00. This effectively established standard time at UT-03:30 with 30 1712# minutes DST. Assume transitions at 24:00 on the specified days until Ley No. 1713# 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other 1714# provisions which oppose" it, resulting in year-round UT-03:30; a Resolución 1715# of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it 1716# would have been under the previous law. 1717# https://www.impo.com.uy/diariooficial/1923/07/02/2 1718# https://www.impo.com.uy/diariooficial/1926/03/10/2 1719# https://www.impo.com.uy/diariooficial/1926/03/18/2 1720# 1721# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1722Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 - 1723Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 1724# From Tim Parenti (2018-02-15): 1725# http://www.impo.com.uy/diariooficial/1933/10/27/6 1726# 1727# It appears Ley No. 9122 of 1933 was never published as such in the Diario 1728# Oficial, but instead appeared as Document 26 in the Diario on Friday 1729# 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of 1730# National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the 1731# last Sunday of October...until the last Saturday of March." In accordance 1732# with this provision, the first transition was explicitly specified in Article 1733# 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29 1734# at 00:00. Assume transitions at 00:00 Sunday throughout. 1735# 1736# Departing from the matter-of-fact nature of previous timekeeping laws, the 1737# 1933 decree "consider[s] the advantages of...the advance of legal time": 1738# 1739# "Whereas: The measure adopted by almost all nations at the time of the last 1740# World War still persists in North America and Europe, precisely because of 1741# the economic, hygienic, and social advantages derived from such an 1742# emergency measure... 1743# 1744# Whereas: The advance of the legal time during the summer seasons, by 1745# displacing social activity near sunrise, favors the citizen populations 1746# and especially the society that creates and works..." 1747# 1748# It further specified that "necessary measures" be taken to ensure that 1749# "public spectacles finish, in general, before [01:00]." 1750Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 - 1751Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 - 1752# From Tim Parenti (2018-02-15): 1753# Most of the Rules below, and their contemporaneous Zone lines, have been 1754# updated simply to match the Almanaque 2018. Although the document does not 1755# list exact transition times, midnight transitions were already present in our 1756# data here for all transitions through 2004-09, and this is both consistent 1757# with prior transitions and verified in several decrees marked below between 1758# 1939-09 and 2004-09, wherein the relevant text was typically of the form: 1759# 1760# "From 0 hours on [date], the legal time of the entire Republic will be... 1761# 1762# In accordance with [the preceding], on [previous date] at 24 hours, all 1763# clocks throughout the Republic will be [advanced/retarded] by..." 1764# 1765# It is possible that there is greater specificity to be found for the Rules 1766# below, but it is buried in no fewer than 40 different decrees individually 1767# referenced by the Almanaque for the period from 1939-09 to 2014-09. 1768# Four-fifths of these were promulgated less than two weeks before taking 1769# effect; more than half within a week and none more than 5 weeks. Only the 1770# handful with comments below have been checked with any thoroughness. 1771Rule Uruguay 1939 only - Oct 1 0:00 0:30 - 1772Rule Uruguay 1940 only - Oct 27 0:00 0:30 - 1773# From Tim Parenti (2018-02-15): 1774# Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified 1775# UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel". 1776# http://www.impo.com.uy/diariooficial/1941/08/04/1 1777Rule Uruguay 1941 only - Aug 1 0:00 0:30 - 1778# From Tim Parenti (2018-02-15): 1779# Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified 1780# further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks 1781# never went back to UT-03:30 thereafter, this is modeled as advancing standard 1782# time by 30 minutes to UT-03, while retaining 30 minutes of DST. 1783# http://www.impo.com.uy/diariooficial/1942/12/16/3 1784Rule Uruguay 1942 only - Dec 14 0:00 0:30 - 1785Rule Uruguay 1943 only - Mar 14 0:00 0 - 1786Rule Uruguay 1959 only - May 24 0:00 0:30 - 1787Rule Uruguay 1959 only - Nov 15 0:00 0 - 1788Rule Uruguay 1960 only - Jan 17 0:00 1:00 - 1789Rule Uruguay 1960 only - Mar 6 0:00 0 - 1790Rule Uruguay 1965 only - Apr 4 0:00 1:00 - 1791Rule Uruguay 1965 only - Sep 26 0:00 0 - 1792# From Tim Parenti (2018-02-15): 1793# Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the 1794# day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00. 1795# http://www.impo.com.uy/diariooficial/1968/05/30/5 1796Rule Uruguay 1968 only - May 27 0:00 0:30 - 1797Rule Uruguay 1968 only - Dec 1 0:00 0 - 1798# From Tim Parenti (2018-02-15): 1799# Decreto 188/970 of 1970-04-23 instituted restrictions on electricity 1800# consumption "as a consequence of the current rainfall regime in the country". 1801# Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00. 1802# http://www.impo.com.uy/diariooficial/1970/04/29/4 1803Rule Uruguay 1970 only - Apr 25 0:00 1:00 - 1804Rule Uruguay 1970 only - Jun 14 0:00 0 - 1805Rule Uruguay 1972 only - Apr 23 0:00 1:00 - 1806Rule Uruguay 1972 only - Jul 16 0:00 0 - 1807# From Tim Parenti (2018-02-15): 1808# Decreto 29/974 of 1974-01-11, citing "the international rise in the price of 1809# oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of 1810# 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30 1811# minutes followed in Decreto 679/974 of 1974-08-29. 1812# http://www.impo.com.uy/diariooficial/1974/01/22/11 1813# http://www.impo.com.uy/diariooficial/1974/03/14/3 1814# http://www.impo.com.uy/diariooficial/1974/09/04/6 1815Rule Uruguay 1974 only - Jan 13 0:00 1:30 - 1816Rule Uruguay 1974 only - Mar 10 0:00 0:30 - 1817Rule Uruguay 1974 only - Sep 1 0:00 0 - 1818Rule Uruguay 1974 only - Dec 22 0:00 1:00 - 1819Rule Uruguay 1975 only - Mar 30 0:00 0 - 1820Rule Uruguay 1976 only - Dec 19 0:00 1:00 - 1821Rule Uruguay 1977 only - Mar 6 0:00 0 - 1822Rule Uruguay 1977 only - Dec 4 0:00 1:00 - 1823Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 - 1824Rule Uruguay 1978 only - Dec 17 0:00 1:00 - 1825Rule Uruguay 1979 only - Apr 29 0:00 1:00 - 1826Rule Uruguay 1980 only - Mar 16 0:00 0 - 1827# From Tim Parenti (2018-02-15): 1828# Decreto 725/987 of 1987-12-04 cited "better use of national tourist 1829# attractions" to advance clocks one hour from Monday 1987-12-14 00:00. 1830# http://www.impo.com.uy/diariooficial/1988/01/25/1 1831Rule Uruguay 1987 only - Dec 14 0:00 1:00 - 1832Rule Uruguay 1988 only - Feb 28 0:00 0 - 1833Rule Uruguay 1988 only - Dec 11 0:00 1:00 - 1834Rule Uruguay 1989 only - Mar 5 0:00 0 - 1835Rule Uruguay 1989 only - Oct 29 0:00 1:00 - 1836Rule Uruguay 1990 only - Feb 25 0:00 0 - 1837# From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04): 1838# IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the 1839# 1992/1993 season appears to be the first in over half a century where DST 1840# both began and ended pursuant to the same decree. 1841Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 - 1842Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 - 1843Rule Uruguay 1992 only - Oct 18 0:00 1:00 - 1844Rule Uruguay 1993 only - Feb 28 0:00 0 - 1845# From Eduardo Cota (2004-09-20): 1846# The Uruguayan government has decreed a change in the local time.... 1847# From Tim Parenti (2018-02-15): 1848# Decreto 328/004 of 2004-09-15. 1849# http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1 1850Rule Uruguay 2004 only - Sep 19 0:00 1:00 - 1851# From Steffen Thorsen (2005-03-11): 1852# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to 1853# save energy ... it was postponed two weeks.... 1854# From Tim Parenti (2018-02-15): 1855# This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous 1856# reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending 1857# Decreto 328/004: 1858# http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1 1859# The original decree specified a transition of 2005-03-12 24:00, but the new 1860# one specified 2005-03-27 02:00. 1861Rule Uruguay 2005 only - Mar 27 2:00 0 - 1862# From Eduardo Cota (2005-09-27): 1863# ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time, 1864# official time in Uruguay will be at GMT -2. 1865# From Tim Parenti (2018-02-15): 1866# Decreto 318/005 of 2005-09-19. 1867# http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1 1868Rule Uruguay 2005 only - Oct 9 2:00 1:00 - 1869Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 - 1870# From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06): 1871# Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday 1872# of October at 02:00 through the second Sunday of March at 02:00. Almanaque 1873# 2018 appears to have a few typoed dates through this period; ignore them. 1874# http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1 1875Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - 1876# From Steffen Thorsen (2015-06-30): 1877# ... it looks like they will not be using DST the coming summer: 1878# http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 1879# http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/ 1880# From Paul Eggert (2015-06-30): 1881# Apparently restaurateurs complained that DST caused people to go to the beach 1882# instead of out to dinner. 1883# From Pablo Camargo (2015-07-13): 1884# http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf 1885# From Tim Parenti (2018-02-15): 1886# Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. 1887 1888# This Zone can be simplified once we assume zic %z. 1889Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10 1890 -3:44:51 - MMT 1920 May 1 # Montevideo MT 1891 -4:00 - -04 1923 Oct 1 1892 -3:30 Uruguay -0330/-03 1942 Dec 14 1893 -3:00 Uruguay -03/-0230 1960 1894 -3:00 Uruguay -03/-02 1968 1895 -3:00 Uruguay -03/-0230 1970 1896 -3:00 Uruguay -03/-02 1974 1897 -3:00 Uruguay -03/-0130 1974 Mar 10 1898 -3:00 Uruguay -03/-0230 1974 Dec 22 1899 -3:00 Uruguay -03/-02 1900 1901# Venezuela 1902# 1903# From Paul Eggert (2015-07-28): 1904# For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533 1905# http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf 1906# 1907# From John Stainforth (2007-11-28): 1908# ... the change for Venezuela originally expected for 2007-12-31 has 1909# been brought forward to 2007-12-09. The official announcement was 1910# published today in the "Gaceta Oficial de la República Bolivariana 1911# de Venezuela, número 38.819" (official document for all laws or 1912# resolution publication) 1913# http://www.globovision.com/news.php?nid=72208 1914 1915# From Alexander Krivenyshev (2016-04-15): 1916# https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino 1917# 1918# From Paul Eggert (2016-04-15): 1919# Clocks advance 30 minutes on 2016-05-01 at 02:30.... 1920# "'Venezuela's new time-zone: hours without light, hours without water, 1921# hours of presidential broadcasts, hours of lines,' quipped comedian 1922# Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps 1923# half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400 1924# https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE 1925# 1926# From Matt Johnson (2016-04-20): 1927# ... published in the official Gazette [2016-04-18], here: 1928# http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf 1929 1930# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1931Zone America/Caracas -4:27:44 - LMT 1890 1932 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? 1933 -4:30 - -0430 1965 Jan 1 0:00 1934 -4:00 - -04 2007 Dec 9 3:00 1935 -4:30 - -0430 2016 May 1 2:30 1936 -4:00 - -04 1937
