1# $OpenBSD: southamerica,v 1.81 2024/02/05 17:07:23 millert Exp $ 2# tzdb data for South America and environs 3 4# This file is in the public domain, so clarified as of 5# 2009-05-17 by Arthur David Olson. 6 7# This file is by no means authoritative; if you think you know better, 8# go ahead and edit the file (and please send any changes to 9# tz@iana.org for general use in the future). For more, please see 10# the file CONTRIBUTING in the tz distribution. 11 12# From Paul Eggert (2016-12-05): 13# 14# Unless otherwise specified, the source for data through 1990 is: 15# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 16# San Diego: ACS Publications, Inc. (2003). 17# Unfortunately this book contains many errors and cites no sources. 18# 19# Many years ago Gwillim Law wrote that a good source 20# for time zone data was the International Air Transport 21# Association's Standard Schedules Information Manual (IATA SSIM), 22# published semiannually. Law sent in several helpful summaries 23# of the IATA's data after 1990. Except where otherwise noted, 24# IATA SSIM is the source for entries after 1990. 25# 26# For data circa 1899, a common source is: 27# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. 28# https://www.jstor.org/stable/1774359 29# 30# These tables use numeric abbreviations like -03 and -0330 for 31# integer hour and minute UT offsets. Although earlier editions used 32# alphabetic time zone abbreviations, these abbreviations were 33# invented and did not reflect common practice. 34 35############################################################################### 36 37############################################################################### 38 39# Argentina 40 41# From Bob Devine (1988-01-28): 42# Argentina: first Sunday in October to first Sunday in April since 1976. 43# Double Summer time from 1969 to 1974. Switches at midnight. 44 45# From U. S. Naval Observatory (1988-01-19): 46# ARGENTINA 3 H BEHIND UTC 47 48# From Hernan G. Otero (1995-06-26): 49# I am sending modifications to the Argentine time zone table... 50# AR was chosen because they are the ISO letters that represent Argentina. 51 52# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 53Rule Arg 1930 only - Dec 1 0:00 1:00 - 54Rule Arg 1931 only - Apr 1 0:00 0 - 55Rule Arg 1931 only - Oct 15 0:00 1:00 - 56Rule Arg 1932 1940 - Mar 1 0:00 0 - 57Rule Arg 1932 1939 - Nov 1 0:00 1:00 - 58Rule Arg 1940 only - Jul 1 0:00 1:00 - 59Rule Arg 1941 only - Jun 15 0:00 0 - 60Rule Arg 1941 only - Oct 15 0:00 1:00 - 61Rule Arg 1943 only - Aug 1 0:00 0 - 62Rule Arg 1943 only - Oct 15 0:00 1:00 - 63Rule Arg 1946 only - Mar 1 0:00 0 - 64Rule Arg 1946 only - Oct 1 0:00 1:00 - 65Rule Arg 1963 only - Oct 1 0:00 0 - 66Rule Arg 1963 only - Dec 15 0:00 1:00 - 67Rule Arg 1964 1966 - Mar 1 0:00 0 - 68Rule Arg 1964 1966 - Oct 15 0:00 1:00 - 69Rule Arg 1967 only - Apr 2 0:00 0 - 70Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 - 71Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 - 72Rule Arg 1974 only - Jan 23 0:00 1:00 - 73Rule Arg 1974 only - May 1 0:00 0 - 74Rule Arg 1988 only - Dec 1 0:00 1:00 - 75# 76# From Hernan G. Otero (1995-06-26): 77# These corrections were contributed by InterSoft Argentina S.A., 78# obtaining the data from the: 79# Talleres de Hidrografía Naval Argentina 80# (Argentine Naval Hydrography Institute) 81Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 82Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 - 83# 84# From Hernan G. Otero (1995-06-26): 85# From this moment on, the law that mandated the daylight saving 86# time corrections was derogated and no more modifications 87# to the time zones (for daylight saving) are now made. 88# 89# From Rives McDow (2000-01-10): 90# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time, 91# which did not result in the switch of a time zone, as they stayed 9 hours 92# from the International Date Line. 93Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 - 94# From Paul Eggert (2007-12-28): 95# DST was set to expire on March 5, not March 3, but since it was converted 96# to standard time on March 3 it's more convenient for us to pretend that 97# it ended on March 3. 98Rule Arg 2000 only - Mar 3 0:00 0 - 99# 100# From Peter Gradelski via Steffen Thorsen (2000-03-01): 101# We just checked with our São Paulo office and they say the government of 102# Argentina decided not to become one of the countries that go on or off DST. 103# So Buenos Aires should be -3 hours from GMT at all times. 104# 105# From Fabián L. Arce Jofré (2000-04-04): 106# The law that claimed DST for Argentina was derogated by President Fernando 107# de la Rúa on March 2, 2000, because it would make people spend more energy 108# in the winter time, rather than less. The change took effect on March 3. 109# 110# From Mariano Absatz (2001-06-06): 111# one of the major newspapers here in Argentina said that the 1999 112# Timezone Law (which never was effectively applied) will (would?) be 113# in effect.... The article is at 114# http://ar.clarin.com/diario/2001-06-06/e-01701.htm 115# ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted 116# 1999-09-17, and published 1999-09-21. The official publication is at: 117# http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF 118# Regretfully, you have to subscribe (and pay) for the on-line version.... 119# 120# (2001-06-12): 121# the timezone for Argentina will not change next Sunday. 122# Apparently it will do so on Sunday 24th.... 123# http://ar.clarin.com/diario/2001-06-12/s-03501.htm 124# 125# (2001-06-25): 126# Last Friday (yes, the last working day before the date of the change), the 127# Senate annulled the 1999 law that introduced the changes later postponed. 128# http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm 129# It remains the vote of the Deputies..., but it will be the same.... 130# This kind of things had always been done this way in Argentina. 131# We are still -03:00 all year round in all of the country. 132# 133# From Steffen Thorsen (2007-12-21): 134# A user (Leonardo Chaim) reported that Argentina will adopt DST.... 135# all of the country (all Zone-entries) are affected. News reports like 136# http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate 137# that Argentina will use DST next year as well, from October to 138# March, although exact rules are not given. 139# 140# From Jesper Nørgaard Welen (2007-12-26) 141# The last hurdle of Argentina DST is over, the proposal was approved in 142# the lower chamber too (Diputados) with a vote 192 for and 2 against. 143# By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to 144# the original scanned proposal, where the dates and the zero hours are 145# clear and unambiguous...This is the article about final approval: 146# http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996 147# 148# From Paul Eggert (2007-12-22): 149# For dates after mid-2008, the following rules are my guesses and 150# are quite possibly wrong, but are more likely than no DST at all. 151 152# From Alexander Krivenyshev (2008-09-05): 153# As per message from Carlos Alberto Fonseca Arauz (Nicaragua), 154# Argentina will start DST on Sunday October 19, 2008. 155# 156# http://www.worldtimezone.com/dst_news/dst_news_argentina03.html 157# http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish) 158 159# From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07) 160# via Rodrigo Severo: 161# Argentinian law No. 25.155 is no longer valid. 162# http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm 163# The new one is law No. 26.350 164# http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm 165# So there is no summer time in Argentina for now. 166 167# From Mariano Absatz (2008-10-20): 168# Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST 169# in Argentina from 2008-10-19 until 2009-03-15. 170# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01 171# 172 173# Decree 1705/2008 excepting 12 Provinces from applying DST in the summer 174# 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La 175# Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego 176# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01 177# 178# Press release 235 dated Saturday October 18th, from the Government of the 179# Province of Jujuy saying it will not apply DST either (even when it was not 180# included in Decree 1705/2008). 181# http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc 182 183# From fullinet (2009-10-18): 184# As announced in 185# http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356 186# (an official .gob.ar) under title: "Sin Cambio de Hora" 187# (English: "No hour change"). 188# 189# "Por el momento, el Gobierno Nacional resolvió no modificar la hora 190# oficial, decisión que estaba en estudio para su implementación el 191# domingo 18 de octubre. Desde el Ministerio de Planificación se anunció 192# que la Argentina hoy, en estas condiciones meteorológicas, no necesita 193# la modificación del huso horario, ya que 2009 nos encuentra con 194# crecimiento en la producción y distribución energética." 195 196Rule Arg 2007 only - Dec 30 0:00 1:00 - 197Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 - 198Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 - 199 200# From Mariano Absatz (2004-05-21): 201# Today it was officially published that the Province of Mendoza is changing 202# its timezone this winter... starting tomorrow night.... 203# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf 204# From Paul Eggert (2004-05-24): 205# It's Law No. 7,210. This change is due to a public power emergency, so for 206# now we'll assume it's for this year only. 207# 208# From Paul Eggert (2018-01-31): 209# Hora de verano para la República Argentina 210# http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html 211# says that standard time in Argentina from 1894-10-31 212# to 1920-05-01 was -4:16:48.25. Go with this more precise value 213# over Shanks & Pottenger. It is upward compatible with Milne, who 214# says Córdoba time was -4:16:48.2. 215 216# 217# From Mariano Absatz (2004-06-05): 218# These media articles from a major newspaper mostly cover the current state: 219# http://www.lanacion.com.ar/04/05/27/de_604825.asp 220# http://www.lanacion.com.ar/04/05/28/de_605203.asp 221# 222# The following eight (8) provinces pulled clocks back to UTC-04:00 at 223# midnight Monday May 31st. (that is, the night between 05/31 and 06/01). 224# Apparently, all nine provinces would go back to UTC-03:00 at the same 225# time in October 17th. 226# 227# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz, 228# Tierra del Fuego, Tucumán. 229# 230# From Mariano Absatz (2004-06-14): 231# ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00 232# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's 233# annoyance with the change is much higher than the power savings obtained.... 234# 235# From Gwillim Law (2004-06-14): 236# http://www.lanacion.com.ar/04/06/10/de_609078.asp ... 237# "The time change in Tierra del Fuego was a conflicted decision from 238# the start. The government had decreed that the measure would take 239# effect on June 1, but a normative error forced the new time to begin 240# three days earlier, from a Saturday to a Sunday.... 241# Our understanding was that the change was originally scheduled to take place 242# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other 243# provinces). Sunday was May 30, only two days earlier. So the article 244# contains a contradiction. I would give more credence to the Saturday/Sunday 245# date than the "three days earlier" phrase, and conclude that Tierra del 246# Fuego set its clocks back at 2004-05-30 00:00. 247# 248# From Steffen Thorsen (2004-10-05): 249# The previous law 7210 which changed the province of Mendoza's time zone 250# back in May have been modified slightly in a new law 7277, which set the 251# new end date to 2004-09-26 (original date was 2004-10-17). 252# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf 253# 254# From Mariano Absatz (2004-10-05): 255# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between 256# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00 257# at midnight between Saturday, July 24th and Sunday, July 25th.... 258# http://www.sanjuan.gov.ar/prensa/archivo/000329.html 259# http://www.sanjuan.gov.ar/prensa/archivo/000426.html 260# http://www.sanjuan.gov.ar/prensa/archivo/000441.html 261 262# From Alex Krivenyshev (2008-01-17): 263# Here are articles that Argentina Province San Luis is planning to end DST 264# as earlier as upcoming Monday January 21, 2008 or February 2008: 265# 266# Provincia argentina retrasa reloj y marca diferencia con resto del país 267# (Argentine Province delayed clock and mark difference with the rest of the 268# country) 269# http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel 270# 271# Es inminente que en San Luis atrasen una hora los relojes 272# (It is imminent in San Luis clocks one hour delay) 273# https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html 274# http://www.worldtimezone.com/dst_news/dst_news_argentina02.html 275 276# From Jesper Nørgaard Welen (2008-01-18): 277# The page of the San Luis provincial government 278# http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812 279# confirms what Alex Krivenyshev has earlier sent to the tz 280# emailing list about that San Luis plans to return to standard 281# time much earlier than the rest of the country. It also 282# confirms that upon request the provinces San Juan and Mendoza 283# refused to follow San Luis in this change. 284# 285# The change is supposed to take place Monday the 21st at 0:00 286# hours. As far as I understand it if this goes ahead, we need 287# a new timezone for San Luis (although there are also documented 288# independent changes in the southamerica file of San Luis in 289# 1990 and 1991 which has not been confirmed). 290 291# From Jesper Nørgaard Welen (2008-01-25): 292# Unfortunately the below page has become defunct, about the San Luis 293# time change. Perhaps because it now is part of a group of pages "Most 294# important pages of 2008." 295# 296# You can use 297# http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834 298# instead it seems. Or use "Buscador" from the main page of the San Luis 299# government, and fill in "huso" and click OK, and you will get 3 pages 300# from which the first one is identical to the above. 301 302# From Mariano Absatz (2008-01-28): 303# I can confirm that the Province of San Luis (and so far only that 304# province) decided to go back to UTC-3 effective midnight Jan 20th 2008 305# (that is, Monday 21st at 0:00 is the time the clocks were delayed back 306# 1 hour), and they intend to keep UTC-3 as their timezone all year round 307# (that is, unless they change their mind any minute now). 308# 309# So we'll have to add yet another city to 'southamerica' (I think San 310# Luis city is the mos populated city in the Province, so it'd be 311# America/Argentina/San_Luis... of course I can't remember if San Luis's 312# history of particular changes goes along with Mendoza or San Juan :-( 313# (I only remember not being able to collect hard facts about San Luis 314# back in 2004, when these provinces changed to UTC-4 for a few days, I 315# mailed them personally and never got an answer). 316 317# From Paul Eggert (2014-08-12): 318# Unless otherwise specified, data entries are from Shanks & Pottenger through 319# 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that 320# America/Cordoba split into 6 subregions during 1991/1992, one of which 321# was America/San_Luis, but we haven't verified this yet so for now we'll 322# keep America/Cordoba a single region rather than splitting it into the 323# other 5 subregions. 324 325# From Mariano Absatz (2009-03-13): 326# Yesterday (with our usual 2-day notice) the Province of San Luis 327# decided that next Sunday instead of "staying" @utc-03:00 they will go 328# to utc-04:00 until the second Saturday in October... 329# 330# The press release is at 331# http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102 332# (I couldn't find the decree, but www.sanluis.gov.ar 333# is the official page for the Province Government.) 334# 335# There's also a note in only one of the major national papers ... 336# http://www.lanacion.com.ar/nota.asp?nota_id=1107912 337# 338# The press release says [quick and dirty translation]: 339# ... announced that next Sunday, at 00:00, Puntanos (the San Luis 340# inhabitants) will have to turn back one hour their clocks 341# 342# Since then, San Luis will establish its own Province timezone. Thus, 343# during 2009, this timezone change will run from 00:00 the third Sunday 344# in March until 24:00 of the second Saturday in October. 345 346# From Mariano Absatz (2009-10-16): 347# ...the Province of San Luis is a case in itself. 348# 349# The Law at 350# http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276 351# is ambiguous because establishes a calendar from the 2nd Sunday in 352# October at 0:00 thru the 2nd Saturday in March at 24:00 and the 353# complement of that starting on the 2nd Sunday of March at 0:00 and 354# ending on the 2nd Saturday of March at 24:00. 355# 356# This clearly breaks every time the 1st of March or October is a Sunday. 357# 358# IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd 359# Sunday of October and March. 360# 361# The problem is that the changes in the rest of the Provinces that did 362# change in 2007/2008, were made according to the Federal Law and Decrees 363# that did so on the 3rd Sunday of October and March. 364# 365# In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday 366# (October 11th) at 0:00. 367# 368# So I guess a new set of rules, besides "Arg", must be made and the last 369# America/Argentina/San_Luis entries should change to use these... 370# ... 371 372# From Alexander Krivenyshev (2010-04-09): 373# According to news reports from El Diario de la República Province San 374# Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time 375# after April 11, 2010 - will continue to have same time as rest of 376# Argentina (UTC-3) (no DST). 377# 378# Confirmaron la prórroga del huso horario de verano (Spanish) 379# http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9 380# or (some English translation): 381# http://www.worldtimezone.com/dst_news/dst_news_argentina08.html 382 383# From Mariano Absatz (2010-04-12): 384# yes...I can confirm this...and given that San Luis keeps calling 385# UTC-03:00 "summer time", we should't just let San Luis go back to "Arg" 386# rules...San Luis is still using "Western ARgentina Time" and it got 387# stuck on Summer daylight savings time even though the summer is over. 388 389# From Paul Eggert (2018-01-23): 390# Perhaps San Luis operates on the legal fiction that it is at -04 391# with perpetual daylight saving time, but ordinary usage typically seems to 392# just say it's at -03; see, for example, 393# https://es.wikipedia.org/wiki/Hora_oficial_argentina 394# We've documented similar situations as being plain changes to 395# standard time, so let's do that here too. This does not change UTC 396# offsets, only tm_isdst and the time zone abbreviations. One minor 397# plus is that this silences a zic complaint that there's no POSIX TZ 398# setting for timestamps past 2038. 399 400# Zone NAME STDOFF RULES FORMAT [UNTIL] 401# 402# Buenos Aires (BA), Capital Federal (CF), 403Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31 404 #STDOFF -4:16:48.25 405 -4:16:48 - CMT 1920 May # Córdoba Mean Time 406 -4:00 - -04 1930 Dec 407 -4:00 Arg -04/-03 1969 Oct 5 408 -3:00 Arg -03/-02 1999 Oct 3 409 -4:00 Arg -04/-03 2000 Mar 3 410 -3:00 Arg -03/-02 411# 412# Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN), 413# Chaco (CC), Formosa (FM), Santiago del Estero (SE) 414# 415# Shanks & Pottenger also make the following claims, which we haven't verified: 416# - Formosa switched to -3:00 on 1991-01-07. 417# - Misiones switched to -3:00 on 1990-12-29. 418# - Chaco switched to -3:00 on 1991-01-04. 419# - Santiago del Estero switched to -4:00 on 1991-04-01, 420# then to -3:00 on 1991-04-26. 421# 422 #STDOFF -4:16:48.25 423Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31 424 -4:16:48 - CMT 1920 May 425 -4:00 - -04 1930 Dec 426 -4:00 Arg -04/-03 1969 Oct 5 427 -3:00 Arg -03/-02 1991 Mar 3 428 -4:00 - -04 1991 Oct 20 429 -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# Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN) 434Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31 435 #STDOFF -4:16:48.25 436 -4:16:48 - CMT 1920 May 437 -4:00 - -04 1930 Dec 438 -4:00 Arg -04/-03 1969 Oct 5 439 -3:00 Arg -03/-02 1991 Mar 3 440 -4:00 - -04 1991 Oct 20 441 -3:00 Arg -03/-02 1999 Oct 3 442 -4:00 Arg -04/-03 2000 Mar 3 443 -3:00 Arg -03/-02 2008 Oct 18 444 -3:00 - -03 445# 446# Tucumán (TM) 447Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31 448 #STDOFF -4:16:48.25 449 -4:16:48 - CMT 1920 May 450 -4:00 - -04 1930 Dec 451 -4:00 Arg -04/-03 1969 Oct 5 452 -3:00 Arg -03/-02 1991 Mar 3 453 -4:00 - -04 1991 Oct 20 454 -3:00 Arg -03/-02 1999 Oct 3 455 -4:00 Arg -04/-03 2000 Mar 3 456 -3:00 - -03 2004 Jun 1 457 -4:00 - -04 2004 Jun 13 458 -3:00 Arg -03/-02 459# 460# La Rioja (LR) 461Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31 462 #STDOFF -4:16:48.25 463 -4:16:48 - CMT 1920 May 464 -4:00 - -04 1930 Dec 465 -4:00 Arg -04/-03 1969 Oct 5 466 -3:00 Arg -03/-02 1991 Mar 1 467 -4:00 - -04 1991 May 7 468 -3:00 Arg -03/-02 1999 Oct 3 469 -4:00 Arg -04/-03 2000 Mar 3 470 -3:00 - -03 2004 Jun 1 471 -4:00 - -04 2004 Jun 20 472 -3:00 Arg -03/-02 2008 Oct 18 473 -3:00 - -03 474# 475# San Juan (SJ) 476Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31 477 #STDOFF -4:16:48.25 478 -4:16:48 - CMT 1920 May 479 -4:00 - -04 1930 Dec 480 -4:00 Arg -04/-03 1969 Oct 5 481 -3:00 Arg -03/-02 1991 Mar 1 482 -4:00 - -04 1991 May 7 483 -3:00 Arg -03/-02 1999 Oct 3 484 -4:00 Arg -04/-03 2000 Mar 3 485 -3:00 - -03 2004 May 31 486 -4:00 - -04 2004 Jul 25 487 -3:00 Arg -03/-02 2008 Oct 18 488 -3:00 - -03 489# 490# Jujuy (JY) 491Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31 492 #STDOFF -4:16:48.25 493 -4:16:48 - CMT 1920 May 494 -4:00 - -04 1930 Dec 495 -4:00 Arg -04/-03 1969 Oct 5 496 -3:00 Arg -03/-02 1990 Mar 4 497 -4:00 - -04 1990 Oct 28 498 -4:00 1:00 -03 1991 Mar 17 499 -4:00 - -04 1991 Oct 6 500 -3:00 1:00 -02 1992 501 -3:00 Arg -03/-02 1999 Oct 3 502 -4:00 Arg -04/-03 2000 Mar 3 503 -3:00 Arg -03/-02 2008 Oct 18 504 -3:00 - -03 505# 506# Catamarca (CT), Chubut (CH) 507Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 508 #STDOFF -4:16:48.25 509 -4:16:48 - CMT 1920 May 510 -4:00 - -04 1930 Dec 511 -4:00 Arg -04/-03 1969 Oct 5 512 -3:00 Arg -03/-02 1991 Mar 3 513 -4:00 - -04 1991 Oct 20 514 -3:00 Arg -03/-02 1999 Oct 3 515 -4:00 Arg -04/-03 2000 Mar 3 516 -3:00 - -03 2004 Jun 1 517 -4:00 - -04 2004 Jun 20 518 -3:00 Arg -03/-02 2008 Oct 18 519 -3:00 - -03 520# 521# Mendoza (MZ) 522Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31 523 #STDOFF -4:16:48.25 524 -4:16:48 - CMT 1920 May 525 -4:00 - -04 1930 Dec 526 -4:00 Arg -04/-03 1969 Oct 5 527 -3:00 Arg -03/-02 1990 Mar 4 528 -4:00 - -04 1990 Oct 15 529 -4:00 1:00 -03 1991 Mar 1 530 -4:00 - -04 1991 Oct 15 531 -4:00 1:00 -03 1992 Mar 1 532 -4:00 - -04 1992 Oct 18 533 -3:00 Arg -03/-02 1999 Oct 3 534 -4:00 Arg -04/-03 2000 Mar 3 535 -3:00 - -03 2004 May 23 536 -4:00 - -04 2004 Sep 26 537 -3:00 Arg -03/-02 2008 Oct 18 538 -3:00 - -03 539# 540# San Luis (SL) 541 542Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 - 543Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 - 544 545Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31 546 #STDOFF -4:16:48.25 547 -4:16:48 - CMT 1920 May 548 -4:00 - -04 1930 Dec 549 -4:00 Arg -04/-03 1969 Oct 5 550 -3:00 Arg -03/-02 1990 551 -3:00 1:00 -02 1990 Mar 14 552 -4:00 - -04 1990 Oct 15 553 -4:00 1:00 -03 1991 Mar 1 554 -4:00 - -04 1991 Jun 1 555 -3:00 - -03 1999 Oct 3 556 -4:00 1:00 -03 2000 Mar 3 557 -3:00 - -03 2004 May 31 558 -4:00 - -04 2004 Jul 25 559 -3:00 Arg -03/-02 2008 Jan 21 560 -4:00 SanLuis -04/-03 2009 Oct 11 561 -3:00 - -03 562# 563# Santa Cruz (SC) 564Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 565 #STDOFF -4:16:48.25 566 -4:16:48 - CMT 1920 May 567 -4:00 - -04 1930 Dec 568 -4:00 Arg -04/-03 1969 Oct 5 569 -3:00 Arg -03/-02 1999 Oct 3 570 -4:00 Arg -04/-03 2000 Mar 3 571 -3:00 - -03 2004 Jun 1 572 -4:00 - -04 2004 Jun 20 573 -3:00 Arg -03/-02 2008 Oct 18 574 -3:00 - -03 575# 576# Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF) 577Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 578 #STDOFF -4:16:48.25 579 -4:16:48 - CMT 1920 May 580 -4:00 - -04 1930 Dec 581 -4:00 Arg -04/-03 1969 Oct 5 582 -3:00 Arg -03/-02 1999 Oct 3 583 -4:00 Arg -04/-03 2000 Mar 3 584 -3:00 - -03 2004 May 30 585 -4:00 - -04 2004 Jun 20 586 -3:00 Arg -03/-02 2008 Oct 18 587 -3:00 - -03 588 589# Aruba 590# Zone NAME STDOFF RULES FORMAT [UNTIL] 591Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad 592 -4:30 - -0430 1965 593 -4:00 - AST 594 595# Bolivia 596# Zone NAME STDOFF RULES FORMAT [UNTIL] 597Zone America/La_Paz -4:32:36 - LMT 1890 598 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT 599 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST 600 -4:00 - -04 601 602# Brazil 603 604# From Paul Eggert (1993-11-18): 605# The mayor of Rio recently attempted to change the time zone rules 606# just in his city, in order to leave more summer time for the tourist trade. 607# The rule change lasted only part of the day; 608# the federal government refused to follow the city's rules, and business 609# was in a chaos, so the mayor backed down that afternoon. 610 611# From IATA SSIM (1996-02): 612# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 613# Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ), 614# Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO), 615# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 616# [The last three states are new to this issue of the IATA SSIM.] 617 618# From Gwillim Law (1996-10-07): 619# Geography, history (Tocantins was part of Goiás until 1989), and other 620# sources of time zone information lead me to believe that AL, SE, and TO were 621# always in BR1, and so the only change was whether or not they observed DST.... 622# The earliest issue of the SSIM I have is 2/91. Each issue from then until 623# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 624# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 625# (UTC-4).... The other two time zones given for Brazil are BR3, which is 626# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 627# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 628# become part of the state of Pernambuco). The boundary between BR1 and BR2 629# has never been clearly stated. They've simply been called East and West. 630# However, some conclusions can be drawn from another IATA manual: the Airline 631# Coding Directory, which lists close to 400 airports in Brazil. For each 632# airport it gives a time zone which is coded to the SSIM. From that 633# information, I'm led to conclude that the states of Amapá (AP), Ceará (CE), 634# Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do 635# Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST. 636 637# From Marcos Tadeu (1998-09-27): 638# Brazilian official page <http://pcdsh01.on.br/verao1.html> 639 640# From Jesper Nørgaard (2000-11-03): 641# [For an official list of which regions in Brazil use which time zones, see:] 642# http://pcdsh01.on.br/Fusbr.htm 643# http://pcdsh01.on.br/Fusbrhv.htm 644 645# From Celso Doria via David Madeo (2002-10-09): 646# The reason for the delay this year has to do with elections in Brazil. 647# 648# Unlike in the United States, elections in Brazil are 100% computerized and 649# the results are known almost immediately. Yesterday, it was the first 650# round of the elections when 115 million Brazilians voted for President, 651# Governor, Senators, Federal Deputies, and State Deputies. Nobody is 652# counting (or re-counting) votes anymore and we know there will be a second 653# round for the Presidency and also for some Governors. The 2nd round will 654# take place on October 27th. 655# 656# The reason why the DST will only begin November 3rd is that the thousands 657# of electoral machines used cannot have their time changed, and since the 658# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM, 659# the Government decided to postpone DST, instead of changing the Constitution 660# (maybe, for the next elections, it will be possible to change the clock)... 661 662# From Rodrigo Severo (2004-10-04): 663# It's just the biannual change made necessary by the much hyped, supposedly 664# modern Brazilian ... voting machines which, apparently, can't deal 665# with a time change between the first and the second rounds of the elections. 666 667# From Steffen Thorsen (2007-09-20): 668# Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: 669# http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975 670 671# From Paul Schulze (2008-06-24): 672# ...by law number 11.662 of April 24, 2008 (published in the "Diario 673# Oficial da União"...) in Brazil there are changes in the timezones, 674# effective today (00:00am at June 24, 2008) as follows: 675# 676# a) The timezone UTC+5 is extinguished, with all the Acre state and the 677# part of the Amazonas state that had this timezone now being put to the 678# timezone UTC+4 679# b) The whole Pará state now is put at timezone UTC+3, instead of just 680# part of it, as was before. 681# 682# This change follows a proposal of senator Tiao Viana of Acre state, that 683# proposed it due to concerns about open television channels displaying 684# programs inappropriate to youths in the states that had the timezone 685# UTC+5 too early in the night. In the occasion, some more corrections 686# were proposed, trying to unify the timezones of any given state. This 687# change modifies timezone rules defined in decree 2.784 of 18 June, 688# 1913. 689 690# From Rodrigo Severo (2008-06-24): 691# Just correcting the URL: 692# https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008 693# 694# As a result of the above Decree I believe the America/Rio_Branco 695# timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall 696# be created to represent the...west side of the Pará State. I 697# suggest this new timezone be called Santarem as the most 698# important/populated city in the affected area. 699# 700# This new timezone would be the same as the Rio_Branco timezone up to 701# the 2008/06/24 change which would be to UTC-3 instead of UTC-4. 702 703# From Alex Krivenyshev (2008-06-24): 704# This is a quick reference page for New and Old Brazil Time Zones map. 705# http://www.worldtimezone.com/brazil-time-new-old.php 706# 707# - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05 708# (state Acre and the part of the Amazonas will be UTC/GMT-04) - western 709# part of Par state is moving to one timezone UTC-03 (from UTC-04). 710 711# From Paul Eggert (2002-10-10): 712# The official decrees referenced below are mostly taken from 713# Decretos sobre o Horário de Verão no Brasil. 714# http://pcdsh01.on.br/DecHV.html 715 716# From Steffen Thorsen (2008-08-29): 717# As announced by the government and many newspapers in Brazil late 718# yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and 719# it will end on 2009-02-15 (current rule for Brazil is fine). Based on 720# past years experience with the elections, there was a good chance that 721# the start was postponed to November, but it did not happen this year. 722# 723# It has not yet been posted to http://pcdsh01.on.br/DecHV.html 724# 725# An official page about it: 726# http://www.mme.gov.br/site/news/detail.do?newsId=16722 727# Note that this link does not always work directly, but must be accessed 728# by going to 729# http://www.mme.gov.br/first 730# 731# One example link that works directly: 732# http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54 733# (Portuguese) 734# 735# We have a written a short article about it as well: 736# https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html 737# 738# From Alexander Krivenyshev (2011-10-04): 739# State Bahia will return to Daylight savings time this year after 8 years off. 740# The announcement was made by Governor Jaques Wagner in an interview to a 741# television station in Salvador. 742 743# In Portuguese: 744# http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html 745# https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html 746 747# From Guilherme Bernardes Rodrigues (2011-10-07): 748# There is news in the media, however there is still no decree about it. 749# I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the 750# official agency about time in Brazil, and she confirmed that the old rule is 751# still in force. 752 753# From Guilherme Bernardes Rodrigues (2011-10-14) 754# It's official, the President signed a decree that includes Bahia in summer 755# time. 756# [ and in a second message (same day): ] 757# I found the decree. 758# 759# DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011 760# Link : 761# http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6 762 763# From Kelley Cook (2012-10-16): 764# The governor of state of Bahia in Brazil announced on Thursday that 765# due to public pressure, he is reversing the DST policy they implemented 766# last year and will not be going to Summer Time on October 21st.... 767# http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia 768 769# From Rodrigo Severo (2012-10-16): 770# Tocantins state will have DST. 771# https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html 772 773# From Steffen Thorsen (2013-09-20): 774# Tocantins in Brazil is very likely not to observe DST from October.... 775# http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto 776# We will keep this article updated when this is confirmed: 777# https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html 778 779# From Steffen Thorsen (2013-10-17): 780# https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html 781# Senator Jorge Viana announced that Acre will change time zone on November 10. 782# He did not specify the time of the change, nor if western parts of Amazonas 783# will change as well. 784# 785# From Paul Eggert (2013-10-17): 786# For now, assume western Amazonas will change as well. 787 788# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 789# Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01) 790# Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10) 791Rule Brazil 1931 only - Oct 3 11:00 1:00 - 792Rule Brazil 1932 1933 - Apr 1 0:00 0 - 793Rule Brazil 1932 only - Oct 3 0:00 1:00 - 794# Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10) 795# revoked DST. 796# Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24) 797# Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13) 798Rule Brazil 1949 1952 - Dec 1 0:00 1:00 - 799Rule Brazil 1950 only - Apr 16 1:00 0 - 800Rule Brazil 1951 1952 - Apr 1 0:00 0 - 801# Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24) 802Rule Brazil 1953 only - Mar 1 0:00 0 - 803# Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30) 804# revoked DST. 805# Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18) 806# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 807# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 808# Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03) 809# extended the above decree to all of the national territory on 12-09. 810Rule Brazil 1963 only - Dec 9 0:00 1:00 - 811# Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25) 812# extended summer time by one day to 1964-03-01 00:00 (start of school). 813Rule Brazil 1964 only - Mar 1 0:00 0 - 814# Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27) 815Rule Brazil 1965 only - Jan 31 0:00 1:00 - 816Rule Brazil 1965 only - Mar 31 0:00 0 - 817# Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22) 818Rule Brazil 1965 only - Dec 1 0:00 1:00 - 819# Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18) 820Rule Brazil 1966 1968 - Mar 1 0:00 0 - 821Rule Brazil 1966 1967 - Nov 1 0:00 1:00 - 822# Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15) 823# revoked DST. 824# Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27) 825Rule Brazil 1985 only - Nov 2 0:00 1:00 - 826# Decree 92,310 (1986-01-21) 827# Decree 92,463 (1986-03-13) 828Rule Brazil 1986 only - Mar 15 0:00 0 - 829# Decree 93,316 (1986-10-01) 830Rule Brazil 1986 only - Oct 25 0:00 1:00 - 831Rule Brazil 1987 only - Feb 14 0:00 0 - 832# Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22) 833Rule Brazil 1987 only - Oct 25 0:00 1:00 - 834Rule Brazil 1988 only - Feb 7 0:00 0 - 835# Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12) 836# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 837Rule Brazil 1988 only - Oct 16 0:00 1:00 - 838Rule Brazil 1989 only - Jan 29 0:00 0 - 839# Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21) 840# with the same exceptions 841Rule Brazil 1989 only - Oct 15 0:00 1:00 - 842Rule Brazil 1990 only - Feb 11 0:00 0 - 843# Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17) 844# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 845# Decree 99,629 (1990-10-19) adds BA, MT. 846Rule Brazil 1990 only - Oct 21 0:00 1:00 - 847Rule Brazil 1991 only - Feb 17 0:00 0 - 848# Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25) 849# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 850Rule Brazil 1991 only - Oct 20 0:00 1:00 - 851Rule Brazil 1992 only - Feb 9 0:00 0 - 852# Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16) 853# adopted by same states. 854Rule Brazil 1992 only - Oct 25 0:00 1:00 - 855Rule Brazil 1993 only - Jan 31 0:00 0 - 856# Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28) 857# adopted by same states, plus AM. 858# Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22; 859# web page corrected 2004-01-07) adopted by same states, minus AM. 860# Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14) 861# adopted by same states, plus MT and TO. 862# Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13) 863# adds AL, SE. 864Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 - 865Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 866Rule Brazil 1996 only - Feb 11 0:00 0 - 867# Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04) 868# adopted by same states, minus AL, SE. 869Rule Brazil 1996 only - Oct 6 0:00 1:00 - 870Rule Brazil 1997 only - Feb 16 0:00 0 - 871# From Daniel C. Sobral (1998-02-12): 872# In 1997, the DS began on October 6. The stated reason was that 873# because international television networks ignored Brazil's policy on DS, 874# they bought the wrong times on satellite for coverage of Pope's visit. 875# This year, the ending date of DS was postponed to March 1 876# to help dealing with the shortages of electric power. 877# 878# Decree 2,317 (1997-09-04), adopted by same states. 879Rule Brazil 1997 only - Oct 6 0:00 1:00 - 880# Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG> 881# (1998-02-10) 882Rule Brazil 1998 only - Mar 1 0:00 0 - 883# Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11) 884# adopted by the same states as before. 885Rule Brazil 1998 only - Oct 11 0:00 1:00 - 886Rule Brazil 1999 only - Feb 21 0:00 0 - 887# Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif> 888# (1999-08-23) adopted by same states. 889# Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30) 890# adds SE, AL, PB, PE, RN, CE, PI, MA and RR. 891Rule Brazil 1999 only - Oct 3 0:00 1:00 - 892Rule Brazil 2000 only - Feb 27 0:00 0 - 893# Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06) 894# adopted by the same states as before. 895# Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13) 896# repeals DST in PE and RR, effective 2000-10-15 00:00. 897# Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17) 898# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. 899# Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif> 900# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE. 901Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 - 902Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 - 903# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE. 904# 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm> 905Rule Brazil 2002 only - Nov 3 0:00 1:00 - 906# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. 907# 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm> 908Rule Brazil 2003 only - Oct 19 0:00 1:00 - 909# Decree 5,223 (2004-10-01) reestablishes DST in MT. 910# 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm> 911Rule Brazil 2004 only - Nov 2 0:00 1:00 - 912# Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19), 913# adopted by the same states as before. 914Rule Brazil 2005 only - Oct 16 0:00 1:00 - 915# Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03), 916# adopted by the same states as before. 917Rule Brazil 2006 only - Nov 5 0:00 1:00 - 918Rule Brazil 2007 only - Feb 25 0:00 0 - 919# Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26), 920# adopted by the same states as before. 921Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 - 922# From Frederico A. C. Neves (2008-09-10): 923# According to this decree 924# http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm 925# [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the 926# 3rd Feb Sunday. There is an exception on the return date when this is 927# the Carnival Sunday then the return date will be the next Sunday... 928Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 - 929Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - 930# Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13) 931# added Bahia. 932Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - 933# Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15) 934# removed Bahia and added Tocantins. 935# Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30) 936# removed Tocantins. 937Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - 938Rule Brazil 2015 only - Feb Sun>=22 0:00 0 - 939Rule Brazil 2016 2019 - Feb Sun>=15 0:00 0 - 940# From Steffen Thorsen (2017-12-18): 941# According to many media sources, next year's DST start in Brazil will move to 942# the first Sunday of November 943# ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html 944# From Steffen Thorsen (2017-12-20): 945# http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm 946# From Fábio Gomes (2018-10-04): 947# The Brazilian president just announced a new change on this year DST. 948# It was scheduled to start on November 4th and it was changed to November 18th. 949# From Rodrigo Brüning Wessler (2018-10-15): 950# The Brazilian government just announced that the change in DST was 951# canceled.... Maybe the president Michel Temer also woke up one hour 952# earlier today. :) 953Rule Brazil 2018 only - Nov Sun>=1 0:00 1:00 - 954# The last ruleset listed above says that the following states observed DST: 955# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. 956# 957# From Steffen Thorsen (2019-04-05): 958# According to multiple sources the Brazilian president wants to get rid of DST. 959# https://gmconline.com.br/noticias/politica/bolsonaro-horario-de-verao-deve-acabar-este-ano 960# https://g1.globo.com/economia/noticia/2019/04/05/governo-anuncia-fim-do-horario-de-verao.ghtml 961# From Marcus Diniz (2019-04-25): 962# Brazil no longer has DST changes - decree signed today 963# https://g1.globo.com/politica/noticia/2019/04/25/bolsonaro-assina-decreto-que-acaba-com-o-horario-de-verao.ghtml 964# From Daniel Soares de Oliveira (2019-04-26): 965# http://www.planalto.gov.br/ccivil_03/_Ato2019-2022/2019/Decreto/D9772.htm 966 967# Zone NAME STDOFF RULES FORMAT [UNTIL] 968# 969# Fernando de Noronha (administratively part of PE) 970Zone America/Noronha -2:09:40 - LMT 1914 971 -2:00 Brazil -02/-01 1990 Sep 17 972 -2:00 - -02 1999 Sep 30 973 -2:00 Brazil -02/-01 2000 Oct 15 974 -2:00 - -02 2001 Sep 13 975 -2:00 Brazil -02/-01 2002 Oct 1 976 -2:00 - -02 977# Other Atlantic islands have no permanent settlement. 978# These include Trindade and Martim Vaz (administratively part of ES), 979# Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE). 980# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; 981# it also included the Penedos. 982# 983# Amapá (AP), east Pará (PA) 984# East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu. 985# The division between east and west Pará is the river Xingu. 986# In the north a very small part from the river Javary (now Jari I guess, 987# the border with Amapá) to the Amazon, then to the Xingu. 988Zone America/Belem -3:13:56 - LMT 1914 989 -3:00 Brazil -03/-02 1988 Sep 12 990 -3:00 - -03 991# 992# west Pará (PA) 993# West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém. 994Zone America/Santarem -3:38:48 - LMT 1914 995 -4:00 Brazil -04/-03 1988 Sep 12 996 -4:00 - -04 2008 Jun 24 0:00 997 -3:00 - -03 998# 999# Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN), 1000# Paraíba (PB) 1001Zone America/Fortaleza -2:34:00 - LMT 1914 1002 -3:00 Brazil -03/-02 1990 Sep 17 1003 -3:00 - -03 1999 Sep 30 1004 -3:00 Brazil -03/-02 2000 Oct 22 1005 -3:00 - -03 2001 Sep 13 1006 -3:00 Brazil -03/-02 2002 Oct 1 1007 -3:00 - -03 1008# 1009# Pernambuco (PE) (except Atlantic islands) 1010Zone America/Recife -2:19:36 - LMT 1914 1011 -3:00 Brazil -03/-02 1990 Sep 17 1012 -3:00 - -03 1999 Sep 30 1013 -3:00 Brazil -03/-02 2000 Oct 15 1014 -3:00 - -03 2001 Sep 13 1015 -3:00 Brazil -03/-02 2002 Oct 1 1016 -3:00 - -03 1017# 1018# Tocantins (TO) 1019Zone America/Araguaina -3:12:48 - LMT 1914 1020 -3:00 Brazil -03/-02 1990 Sep 17 1021 -3:00 - -03 1995 Sep 14 1022 -3:00 Brazil -03/-02 2003 Sep 24 1023 -3:00 - -03 2012 Oct 21 1024 -3:00 Brazil -03/-02 2013 Sep 1025 -3:00 - -03 1026# 1027# Alagoas (AL), Sergipe (SE) 1028Zone America/Maceio -2:22:52 - LMT 1914 1029 -3:00 Brazil -03/-02 1990 Sep 17 1030 -3:00 - -03 1995 Oct 13 1031 -3:00 Brazil -03/-02 1996 Sep 4 1032 -3:00 - -03 1999 Sep 30 1033 -3:00 Brazil -03/-02 2000 Oct 22 1034 -3:00 - -03 2001 Sep 13 1035 -3:00 Brazil -03/-02 2002 Oct 1 1036 -3:00 - -03 1037# 1038# Bahia (BA) 1039# There are too many Salvadors elsewhere, so use America/Bahia instead 1040# of America/Salvador. 1041Zone America/Bahia -2:34:04 - LMT 1914 1042 -3:00 Brazil -03/-02 2003 Sep 24 1043 -3:00 - -03 2011 Oct 16 1044 -3:00 Brazil -03/-02 2012 Oct 21 1045 -3:00 - -03 1046# 1047# Goiás (GO), Distrito Federal (DF), Minas Gerais (MG), 1048# Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR), 1049# Santa Catarina (SC), Rio Grande do Sul (RS) 1050Zone America/Sao_Paulo -3:06:28 - LMT 1914 1051 -3:00 Brazil -03/-02 1963 Oct 23 0:00 1052 -3:00 1:00 -02 1964 1053 -3:00 Brazil -03/-02 1054# 1055# Mato Grosso do Sul (MS) 1056Zone America/Campo_Grande -3:38:28 - LMT 1914 1057 -4:00 Brazil -04/-03 1058# 1059# Mato Grosso (MT) 1060Zone America/Cuiaba -3:44:20 - LMT 1914 1061 -4:00 Brazil -04/-03 2003 Sep 24 1062 -4:00 - -04 2004 Oct 1 1063 -4:00 Brazil -04/-03 1064# 1065# Rondônia (RO) 1066Zone America/Porto_Velho -4:15:36 - LMT 1914 1067 -4:00 Brazil -04/-03 1988 Sep 12 1068 -4:00 - -04 1069# 1070# Roraima (RR) 1071Zone America/Boa_Vista -4:02:40 - LMT 1914 1072 -4:00 Brazil -04/-03 1988 Sep 12 1073 -4:00 - -04 1999 Sep 30 1074 -4:00 Brazil -04/-03 2000 Oct 15 1075 -4:00 - -04 1076# 1077# east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto 1078# The great circle line from Tabatinga to Porto Acre divides 1079# east from west Amazonas. 1080Zone America/Manaus -4:00:04 - LMT 1914 1081 -4:00 Brazil -04/-03 1988 Sep 12 1082 -4:00 - -04 1993 Sep 28 1083 -4:00 Brazil -04/-03 1994 Sep 22 1084 -4:00 - -04 1085# 1086# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, 1087# Eirunepé, Envira, Ipixuna 1088Zone America/Eirunepe -4:39:28 - LMT 1914 1089 -5:00 Brazil -05/-04 1988 Sep 12 1090 -5:00 - -05 1993 Sep 28 1091 -5:00 Brazil -05/-04 1994 Sep 22 1092 -5:00 - -05 2008 Jun 24 0:00 1093 -4:00 - -04 2013 Nov 10 1094 -5:00 - -05 1095# 1096# Acre (AC) 1097Zone America/Rio_Branco -4:31:12 - LMT 1914 1098 -5:00 Brazil -05/-04 1988 Sep 12 1099 -5:00 - -05 2008 Jun 24 0:00 1100 -4:00 - -04 2013 Nov 10 1101 -5:00 - -05 1102 1103# Chile 1104 1105# From Paul Eggert (2022-03-15): 1106# Shanks & Pottenger says America/Santiago introduced standard time in 1107# 1890 and rounds its UT offset to 70W40; guess that in practice this 1108# was the same offset as in 1916-1919. It also says Pacific/Easter 1109# standardized on 109W22 in 1890; assume this didn't change the clocks. 1110# 1111# Dates for America/Santiago from 1910 to 2004 are primarily from 1112# the following source, cited by Oscar van Vlijmen (2006-10-08): 1113# [1] Chile Law 1114# http://www.webexhibits.org/daylightsaving/chile.html 1115# This contains a copy of this official table: 1116# Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30) 1117# https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm 1118# [1] needs several corrections, though. 1119# 1120# The first set of corrections is from: 1121# [2] History of the Official Time of Chile 1122# http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See: 1123# https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html 1124# This is an English translation of: 1125# Historia de la hora oficial de Chile (retrieved 2012-10-24). See: 1126# https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm 1127# A fancier Spanish version (requiring mouse-clicking) is at: 1128# http://www.horaoficial.cl/historia_hora.php 1129# Conflicts between [1] and [2] were resolved as follows: 1130# 1131# - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites 1132# Boletín No. 1, Aviso No. 1 (1910). Go with [2]. 1133# 1134# - [1] says SMT was -4:42:45, [2] says Chile's official time from 1135# 1916 to 1919 was -4:42:46.3, the meridian of Chile's National 1136# Astronomical Observatory (OAN), then located in what is now 1137# Quinta Normal in Santiago. Go with [1], as this matches the meridian 1138# referred to by the relevant Chilean laws to this day. 1139# 1140# - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites 1141# Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2]. 1142# 1143# - [1] does not give times for transitions; assume they occur 1144# at midnight mainland time, the current common practice. However, 1145# go with [2]'s specification of 23:00 for the 1947-05-21 transition. 1146# 1147# Another correction to [1] is from Jesper Nørgaard Welen, who 1148# wrote (2006-10-08), "I think that there are some obvious mistakes in 1149# the suggested link from Oscar van Vlijmen,... for instance entry 66 1150# says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at 1151# 1990-09-15 (they should have been 1990-09-15 and 1990-09-16 1152# respectively), but anyhow it clears up some doubts too." 1153# 1154# Data for Pacific/Easter from 1910 through 1967 come from Shanks & 1155# Pottenger. After that, for lack of better info assume 1156# Pacific/Easter is always two hours behind America/Santiago; 1157# this is known to work for DST transitions starting in 2008 and 1158# may well be true for earlier transitions. 1159 1160# From Tim Parenti (2022-07-06): 1161# For a brief period of roughly six weeks in 1946, DST was only observed on an 1162# emergency basis in specific regions of central Chile; namely, "the national 1163# territory between the provinces of Coquimbo and Concepción, inclusive". 1164# This was enacted by Decree 3,891, dated 1946-07-13, and took effect 1165# 1946-07-14 24:00, advancing these central regions to -03. 1166# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460715/#page/1 1167# The decree contemplated "[t]hat this advancement of the Official Time, even 1168# though it has been proposed for the cities of Santiago and Valparaíso only, 1169# must be agreed with that of other cities, due to the connection of various 1170# activities that require it, such as, for example, the operation of rail 1171# services". It was originally set to expire after 30 days but was extended 1172# through 1946-08-31 by Decree 4,506, dated 1946-08-13. 1173# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460814/#page/1 1174# 1175# Law Number 8,522, promulgated 1946-08-27, reunified Chilean clocks at their 1176# new "Summer Time" of -04, reckoned as that of "the meridian of the 1177# Astronomical Observatory of Lo Espejo, advanced by 42 minutes and 45 1178# seconds". Although this law specified the new Summer Time to start on 1 1179# September each year, a special "transitional article" started it a few days 1180# early, as soon as the law took effect. As the law was to take force "from 1181# the date of its publication in the 'Diario Oficial', which happened the 1182# following day, presume the change took place in Santiago and its environs 1183# from 24:00 -03 to 23:00 -04 on Wednesday 1946-08-28. Although this was a 1184# no-op for wall clocks in the north and south of the country, put their formal 1185# start to DST an hour later when they reached 24:00 -04. 1186# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460828/#page/1 1187# After a brief "Winter Time" stint at -05 beginning 1947-04-01, Law Number 1188# 8,777, promulgated 1947-05-17, established year-round -04 "from 23:00 on the 1189# second day after it is published in the 'Diario Oficial'." It was published 1190# on Monday 1947-05-19 and so took effect from Wednesday 1947-05-21 23:00. 1191# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19470519/#page/1 1192 1193# From Eduardo Krell (1995-10-19): 1194# The law says to switch to DST at midnight [24:00] on the second SATURDAY 1195# of October.... The law is the same for March and October. 1196# (1998-09-29): 1197# Because of the drought this year, the government decided to go into 1198# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 1199# (unless there's another dry season next year, I guess). 1200 1201# From Julio I. Pacheco Troncoso (1999-03-18): 1202# Because of the same drought, the government decided to end DST later, 1203# on April 3, (one-time change). 1204 1205# From Germán Poo-Caamaño (2008-03-03): 1206# Due to drought, Chile extends Daylight Time in three weeks. This 1207# is one-time change (Saturday 3/29 at 24:00 for America/Santiago 1208# and Saturday 3/29 at 22:00 for Pacific/Easter) 1209# The Supreme Decree is located at 1210# http://www.shoa.cl/servicios/supremo316.pdf 1211# 1212# From José Miguel Garrido (2008-03-05): 1213# http://www.shoa.cl/noticias/2008/04hora/hora.htm 1214 1215# From Angel Chiang (2010-03-04): 1216# Subject: DST in Chile exceptionally extended to 3 April due to earthquake 1217# http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098 1218# 1219# From Arthur David Olson (2010-03-06): 1220# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch. 1221 1222# From Glenn Eychaner (2011-03-28): 1223# http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E} 1224# In English: 1225# Chile's clocks will go back an hour this year on the 7th of May instead 1226# of this Saturday. They will go forward again the 3rd Saturday in 1227# August, not in October as they have since 1968. 1228 1229# From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23): 1230# As stated in the website of the Chilean Energy Ministry 1231# http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html 1232# The Chilean Government has decided to postpone the entrance into winter time 1233# (to leave DST) from March 11 2012 to April 28th 2012.... 1234# Quote from the website communication: 1235# 1236# 6. For the year 2012, the dates of entry into winter time will be as follows: 1237# a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at 1238# 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00 1239# of the same day. 1240# b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is, 1241# at 23:59:59, instead of passing to 0:00, the time should be adjusted to be 1242# 01:00 on September 2. 1243 1244# From Steffen Thorsen (2013-02-15): 1245# According to several news sources, Chile has extended DST this year, 1246# they will end DST later and start DST earlier than planned. They 1247# hope to save energy. The new end date is 2013-04-28 00:00 and new 1248# start date is 2013-09-08 00:00.... 1249# http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm 1250 1251# From José Miguel Garrido (2014-02-19): 1252# Today appeared in the Diario Oficial a decree amending the time change 1253# dates to 2014. 1254# DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC) 1255# DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC) 1256# http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf 1257 1258# From Eduardo Romero Urra (2015-03-03): 1259# Today has been published officially that Chile will use the DST time 1260# permanently until March 25 of 2017 1261# http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg 1262# 1263# From Paul Eggert (2015-03-03): 1264# For now, assume that the extension will persist indefinitely. 1265 1266# From Juan Correa (2016-03-18): 1267# The decree regarding DST has been published in today's Official Gazette: 1268# http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/ 1269# http://www.leychile.cl/Navegar?idNorma=1088502 1270# It does consider the second Saturday of May and August as the dates 1271# for the transition; and it lists DST dates until 2019, but I think 1272# this scheme will stick. 1273# 1274# From Paul Eggert (2016-03-18): 1275# For now, assume the pattern holds for the indefinite future. 1276# The decree says transitions occur at 24:00; in practice this appears 1277# to mean 24:00 mainland time, not 24:00 local time, so that Easter 1278# Island is always two hours behind the mainland. 1279 1280# From Juan Correa (2016-12-04): 1281# Magallanes region ... will keep DST (UTC -3) all year round.... 1282# 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 1283# From Deborah Goldsmith (2017-01-19): 1284# http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf 1285 1286# From Juan Correa (2018-08-13): 1287# As of moments ago, the Ministry of Energy in Chile has announced the new 1288# schema for DST. ... Announcement in video (in Spanish): 1289# https://twitter.com/MinEnergia/status/1029000399129374720 1290# From Yonathan Dossow (2018-08-13): 1291# The video says "first Saturday of September", we all know it means Sunday at 1292# midnight. 1293# From Tim Parenti (2018-08-13): 1294# Translating the captions on the video at 0:44-0:55, "We want to announce as 1295# Government that from 2019, Winter Time will be increased to 5 months, between 1296# the first Saturday of April and the first Saturday of September." 1297# At 2:08-2:20, "The Magallanes region will maintain its current time, as 1298# decided by the citizens during 2017, but our Government will promote a 1299# regional dialogue table to gather their opinion on this matter." 1300# https://twitter.com/MinEnergia/status/1029009354001973248 1301# "We will keep the new time policy unchanged for at least the next 4 years." 1302# So we extend the new rules on Saturdays at 24:00 mainland time indefinitely. 1303# From Juan Correa (2019-02-04): 1304# http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/1498738.pdf 1305 1306# From Juan Correa (2022-04-02): 1307# I found there was a decree published last Thursday that will keep 1308# Magallanes region to UTC -3 "indefinitely". The decree is available at 1309# https://www.diariooficial.interior.gob.cl/publicaciones/2022/03/31/43217-B/01/2108910.pdf 1310 1311# From Juan Correa (2022-08-09): 1312# the Internal Affairs Ministry (Ministerio del Interior) informed DST 1313# for America/Santiago will start on midnight of September 11th; 1314# and will end on April 1st, 2023. Magallanes region (America/Punta_Arenas) 1315# will keep UTC -3 "indefinitely"... This is because on September 4th 1316# we will have a voting whether to approve a new Constitution. 1317# 1318# From Eduardo Romero Urra (2022-08-17): 1319# https://www.diariooficial.interior.gob.cl/publicaciones/2022/08/13/43327/01/2172567.pdf 1320# 1321# From Paul Eggert (2022-08-17): 1322# Although the presidential decree stops at fall 2026, assume that 1323# similar DST rules will continue thereafter. 1324 1325# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1326Rule Chile 1927 1931 - Sep 1 0:00 1:00 - 1327Rule Chile 1928 1932 - Apr 1 0:00 0 - 1328Rule Chile 1968 only - Nov 3 4:00u 1:00 - 1329Rule Chile 1969 only - Mar 30 3:00u 0 - 1330Rule Chile 1969 only - Nov 23 4:00u 1:00 - 1331Rule Chile 1970 only - Mar 29 3:00u 0 - 1332Rule Chile 1971 only - Mar 14 3:00u 0 - 1333Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 - 1334Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - 1335Rule Chile 1973 only - Sep 30 4:00u 1:00 - 1336Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 - 1337Rule Chile 1987 only - Apr 12 3:00u 0 - 1338Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 - 1339Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 - 1340Rule Chile 1990 only - Sep 16 4:00u 1:00 - 1341Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - 1342Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 - 1343Rule Chile 1997 only - Mar 30 3:00u 0 - 1344Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - 1345Rule Chile 1998 only - Sep 27 4:00u 1:00 - 1346Rule Chile 1999 only - Apr 4 3:00u 0 - 1347Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 - 1348Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 - 1349# N.B.: the end of March 29 in Chile is March 30 in Universal time, 1350# which is used below in specifying the transition. 1351Rule Chile 2008 only - Mar 30 3:00u 0 - 1352Rule Chile 2009 only - Mar Sun>=9 3:00u 0 - 1353Rule Chile 2010 only - Apr Sun>=1 3:00u 0 - 1354Rule Chile 2011 only - May Sun>=2 3:00u 0 - 1355Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 - 1356Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 - 1357Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 - 1358Rule Chile 2016 2018 - May Sun>=9 3:00u 0 - 1359Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 - 1360Rule Chile 2019 max - Apr Sun>=2 3:00u 0 - 1361Rule Chile 2019 2021 - Sep Sun>=2 4:00u 1:00 - 1362Rule Chile 2022 only - Sep Sun>=9 4:00u 1:00 - 1363Rule Chile 2023 max - Sep Sun>=2 4:00u 1:00 - 1364# IATA SSIM anomalies: (1992-02) says 1992-03-14; 1365# (1996-09) says 1998-03-08. Ignore these. 1366# Zone NAME STDOFF RULES FORMAT [UNTIL] 1367Zone America/Santiago -4:42:45 - LMT 1890 1368 -4:42:45 - SMT 1910 Jan 10 # Santiago Mean Time 1369 -5:00 - -05 1916 Jul 1 1370 -4:42:45 - SMT 1918 Sep 10 1371 -4:00 - -04 1919 Jul 1 1372 -4:42:45 - SMT 1927 Sep 1 1373 -5:00 Chile -05/-04 1932 Sep 1 1374 -4:00 - -04 1942 Jun 1 1375 -5:00 - -05 1942 Aug 1 1376 -4:00 - -04 1946 Jul 14 24:00 1377 -4:00 1:00 -03 1946 Aug 28 24:00 # central CL 1378 -5:00 1:00 -04 1947 Mar 31 24:00 1379 -5:00 - -05 1947 May 21 23:00 1380 -4:00 Chile -04/-03 1381Zone America/Punta_Arenas -4:43:40 - LMT 1890 1382 -4:42:45 - SMT 1910 Jan 10 1383 -5:00 - -05 1916 Jul 1 1384 -4:42:45 - SMT 1918 Sep 10 1385 -4:00 - -04 1919 Jul 1 1386 -4:42:45 - SMT 1927 Sep 1 1387 -5:00 Chile -05/-04 1932 Sep 1 1388 -4:00 - -04 1942 Jun 1 1389 -5:00 - -05 1942 Aug 1 1390 -4:00 - -04 1946 Aug 28 24:00 1391 -5:00 1:00 -04 1947 Mar 31 24:00 1392 -5:00 - -05 1947 May 21 23:00 1393 -4:00 Chile -04/-03 2016 Dec 4 1394 -3:00 - -03 1395Zone Pacific/Easter -7:17:28 - LMT 1890 1396 -7:17:28 - EMT 1932 Sep # Easter Mean Time 1397 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time 1398 -6:00 Chile -06/-05 1399# 1400# Salas y Gómez Island is uninhabited. 1401# Other Chilean locations, including Juan Fernández Is, Desventuradas Is, 1402# and Antarctic bases, are like America/Santiago. 1403 1404# Antarctic base using South American rules 1405# (See the file 'antarctica' for more.) 1406# 1407# Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) 1408# 1409# From Ethan Dicks (1996-10-06): 1410# It keeps the same time as Punta Arenas, Chile, because, just like us 1411# and the South Pole, that's the other end of their supply line.... 1412# I verified with someone who was there that since 1980, 1413# Palmer has followed Chile. Prior to that, before the Falklands War, 1414# Palmer used to be supplied from Argentina. 1415# 1416# Zone NAME STDOFF RULES FORMAT [UNTIL] 1417Zone Antarctica/Palmer 0 - -00 1965 1418 -4:00 Arg -04/-03 1969 Oct 5 1419 -3:00 Arg -03/-02 1982 May 1420 -4:00 Chile -04/-03 2016 Dec 4 1421 -3:00 - -03 1422 1423# Colombia 1424 1425# Milne gives 4:56:16.4 for Bogotá time in 1899. He writes, 1426# "A variation of fifteen minutes in the public clocks of Bogota is not rare." 1427 1428# From Alois Treindl (2022-11-10): 1429# End of time change in Colombia 1993 ... should be 6 February 24h ... 1430# DECRETO 267 DE 1993 1431# https://www.suin-juriscol.gov.co/viewDocument.asp?ruta=Decretos/1061335 1432 1433# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1434Rule CO 1992 only - May 3 0:00 1:00 - 1435Rule CO 1993 only - Feb 6 24:00 0 - 1436# Zone NAME STDOFF RULES FORMAT [UNTIL] 1437 #STDOFF -4:56:16.4 1438Zone America/Bogota -4:56:16 - LMT 1884 Mar 13 1439 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time 1440 -5:00 CO -05/-04 1441# Malpelo, Providencia, San Andres 1442# no information; probably like America/Bogota 1443 1444# Curaçao 1445# Zone NAME STDOFF RULES FORMAT [UNTIL] 1446Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad 1447 -4:30 - -0430 1965 1448 -4:00 - AST 1449 1450Link America/Curacao America/Kralendijk 1451Link America/Curacao America/Lower_Princes 1452# Ecuador 1453# 1454# Milne says the Central and South American Telegraph Company used -5:24:15. 1455# 1456# From Alois Treindl (2016-12-15): 1457# https://www.elcomercio.com/actualidad/hora-sixto-1993.html 1458# ... Whether the law applied also to Galápagos, I do not know. 1459# From Paul Eggert (2016-12-15): 1460# https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html 1461# This says President Sixto Durán Ballén signed decree No. 285, which 1462# established DST from 1992-11-28 to 1993-02-05; it does not give transition 1463# times. The people called it "hora de Sixto" ("Sixto hour"). The change did 1464# not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics 1465# that included "Amanecía en mitad de la noche, los guaguas iban a clase sin 1466# sol" ("It was dawning in the middle of the night, the buses went to class 1467# without sun"). Although Ballén's campaign slogan was "Ni un paso atrás" 1468# (Not one step back), the clocks went back in 1993 and the experiment was not 1469# repeated. For now, assume transitions were at 00:00 local time country-wide. 1470# 1471# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1472Rule Ecuador 1992 only - Nov 28 0:00 1:00 - 1473Rule Ecuador 1993 only - Feb 5 0:00 0 - 1474# 1475# Zone NAME STDOFF RULES FORMAT [UNTIL] 1476Zone America/Guayaquil -5:19:20 - LMT 1890 1477 -5:14:00 - QMT 1931 # Quito Mean Time 1478 -5:00 Ecuador -05/-04 1479Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 1480 -5:00 - -05 1986 1481 -6:00 Ecuador -06/-05 1482 1483# Falklands 1484 1485# From Paul Eggert (2006-03-22): 1486# Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except 1487# the IATA gives 1996-09-08. Go with Shanks & Pottenger. 1488 1489# From Falkland Islands Government Office, London (2001-01-22) 1490# via Jesper Nørgaard: 1491# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15 1492# April 2001 and advance one hour to summer time at 2 am on Sunday 2 1493# September. It is anticipated that the clocks will revert back at 2 1494# am on Sunday 21 April 2002 and advance to summer time at 2 am on 1495# Sunday 1 September. 1496 1497# From Rives McDow (2001-02-13): 1498# 1499# I have communicated several times with people there, and the last 1500# time I had communications that was helpful was in 1998. Here is 1501# what was said then: 1502# 1503# "The general rule was that Stanley used daylight saving and the Camp 1504# did not. However for various reasons many people in the Camp have 1505# started to use daylight saving (known locally as 'Stanley Time') 1506# There is no rule as to who uses daylight saving - it is a matter of 1507# personal choice and so it is impossible to draw a map showing who 1508# uses it and who does not. Any list would be out of date as soon as 1509# it was produced. This year daylight saving ended on April 18/19th 1510# and started again on September 12/13th. I do not know what the rule 1511# is, but can find out if you like. We do not change at the same time 1512# as UK or Chile." 1513# 1514# I did have in my notes that the rule was "Second Saturday in Sep at 1515# 0:00 until third Saturday in Apr at 0:00". I think that this does 1516# not agree in some cases with Shanks; is this true? 1517# 1518# Also, there is no mention in the list that some areas in the 1519# Falklands do not use DST. I have found in my communications there 1520# that these areas are on the western half of East Falkland and all of 1521# West Falkland. Stanley is the only place that consistently observes 1522# DST. Again, as in other places in the world, the farmers don't like 1523# it. West Falkland is almost entirely sheep farmers. 1524# 1525# I know one lady there that keeps a list of which farm keeps DST and 1526# which doesn't each year. She runs a shop in Stanley, and says that 1527# the list changes each year. She uses it to communicate to her 1528# customers, catching them when they are home for lunch or dinner. 1529 1530# From Paul Eggert (2001-03-05): 1531# For now, we'll just record the time in Stanley, since we have no 1532# better info. 1533 1534# From Steffen Thorsen (2011-04-01): 1535# The Falkland Islands will not turn back clocks this winter, but stay on 1536# daylight saving time. 1537# 1538# One source: 1539# http://www.falklandnews.com/public/story.cfm?get=5914&source=3 1540# 1541# We have gotten this confirmed by a clerk of the legislative assembly: 1542# Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the 1543# third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3 1544# hours) on the first Sunday of September at 0200hrs. 1545# 1546# IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands 1547# will not revert to local mean time, but clocks will remain on Summer 1548# time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term 1549# change to local time following the trial period will be notified. 1550# 1551# From Andrew Newman (2012-02-24) 1552# A letter from Justin McPhee, Chief Executive, 1553# Cable & Wireless Falkland Islands (dated 2012-02-22) 1554# states... 1555# The current Atlantic/Stanley entry under South America expects the 1556# clocks to go back to standard Falklands Time (FKT) on the 15th April. 1557# The database entry states that in 2011 Stanley was staying on fixed 1558# summer time on a trial basis only. FIG need to contact IANA and/or 1559# the maintainers of the database to inform them we're adopting 1560# the same policy this year and suggest recommendations for future years. 1561# 1562# For now we will assume permanent -03 for the Falklands 1563# until advised differently (to apply for 2012 and beyond, after the 2011 1564# experiment was apparently successful.) 1565# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1566Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 - 1567Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 1568Rule Falk 1939 only - Oct 1 0:00 1:00 - 1569Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 - 1570Rule Falk 1943 only - Jan 1 0:00 0 - 1571Rule Falk 1983 only - Sep lastSun 0:00 1:00 - 1572Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 1573Rule Falk 1984 only - Sep 16 0:00 1:00 - 1574Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 - 1575Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 - 1576Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 - 1577Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 - 1578# Zone NAME STDOFF RULES FORMAT [UNTIL] 1579Zone Atlantic/Stanley -3:51:24 - LMT 1890 1580 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 1581 -4:00 Falk -04/-03 1983 May 1582 -3:00 Falk -03/-02 1985 Sep 15 1583 -4:00 Falk -04/-03 2010 Sep 5 2:00 1584 -3:00 - -03 1585 1586# French Guiana 1587# For the 1911/1912 establishment of standard time in French possessions, see: 1588# Société Française de Physique, Recueil de constantes physiques (1913), 1589# page 752, 18b. 1590# Zone NAME STDOFF RULES FORMAT [UNTIL] 1591Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1 1592 -4:00 - -04 1967 Oct 1593 -3:00 - -03 1594 1595# Guyana 1596 1597# From P Chan (2020-11-27): 1598# https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547 1599# The Official Gazette of British Guiana. (New Series.) Vol. XL. July to 1600# December, 1915, p 1547, lists as several notes: 1601# "Local Mean Time 3 hours 52 mins. 39 secs. slow of Greenwich Mean Time 1602# (Georgetown.) From 1st August, 1911, British Guiana Standard Mean Time 4 1603# hours slow of Greenwich Mean Time, by notice in Official Gazette on 1st July, 1604# 1911. From 1st March, 1915, British Guiana Standard Mean Time 3 hours 45 1605# mins. 0 secs. slow of Greenwich Mean Time, by notice in Official Gazette on 1606# 23rd January, 1915." 1607# 1608# https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpretation_and_general_clauses_(amendment)_act_1975.pdf 1609# Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975) 1610# [dated 1975-07-31] 1611# "This Act...shall come into operation on 1st August, 1975." 1612# "...where any expression of time occurs...the time referred to shall signify 1613# the standard time of Guyana which shall be three hours behind Greenwich Mean 1614# Time." 1615# 1616# Circular No. 10/1992 dated 1992-03-20 1617# https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf 1618# "...cabinet has decided that with effect from Sunday 29th March, 1992, Guyana 1619# Standard Time would be re-established at 01:00 hours by adjusting the hands 1620# of the clock back to 24:00 hours." 1621# Legislated in the Interpretation and general clauses (Amendment) Act 1992 1622# (Act No. 6 of 1992) [passed 1992-03-27, published 1992-04-18] 1623# https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_general_clauses_(amendment)_act_1992.pdf 1624 1625# Zone NAME STDOFF RULES FORMAT [UNTIL] 1626Zone America/Guyana -3:52:39 - LMT 1911 Aug 1 # Georgetown 1627 -4:00 - -04 1915 Mar 1 1628 -3:45 - -0345 1975 Aug 1 1629 -3:00 - -03 1992 Mar 29 1:00 1630 -4:00 - -04 1631 1632# Paraguay 1633# 1634# From Paul Eggert (2006-03-22): 1635# Shanks & Pottenger say that spring transitions are 01:00 -> 02:00, 1636# and autumn transitions are 00:00 -> 23:00. Go with pre-1999 1637# editions of Shanks, and with the IATA, who say transitions occur at 00:00. 1638# 1639# From Waldemar Villamayor-Venialbo (2013-09-20): 1640# No time of the day is established for the adjustment, so people normally 1641# adjust their clocks at 0 hour of the given dates. 1642# 1643# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1644Rule Para 1975 1988 - Oct 1 0:00 1:00 - 1645Rule Para 1975 1978 - Mar 1 0:00 0 - 1646Rule Para 1979 1991 - Apr 1 0:00 0 - 1647Rule Para 1989 only - Oct 22 0:00 1:00 - 1648Rule Para 1990 only - Oct 1 0:00 1:00 - 1649Rule Para 1991 only - Oct 6 0:00 1:00 - 1650Rule Para 1992 only - Mar 1 0:00 0 - 1651Rule Para 1992 only - Oct 5 0:00 1:00 - 1652Rule Para 1993 only - Mar 31 0:00 0 - 1653Rule Para 1993 1995 - Oct 1 0:00 1:00 - 1654Rule Para 1994 1995 - Feb lastSun 0:00 0 - 1655Rule Para 1996 only - Mar 1 0:00 0 - 1656# IATA SSIM (2000-02) says 1999-10-10; ignore this for now. 1657# From Steffen Thorsen (2000-10-02): 1658# I have three independent reports that Paraguay changed to DST this Sunday 1659# (10-01). 1660# 1661# Translated by Gwillim Law (2001-02-27) from 1662# Noticias, a daily paper in Asunción, Paraguay (2000-10-01): 1663# http://www.diarionoticias.com.py/011000/nacional/naciona1.htm 1664# Starting at 0:00 today, the clock will be set forward 60 minutes, in 1665# fulfillment of Decree No. 7,273 of the Executive Power.... The time change 1666# system has been operating for several years. Formerly there was a separate 1667# decree each year; the new law has the same effect, but permanently. Every 1668# year, the time will change on the first Sunday of October; likewise, the 1669# clock will be set back on the first Sunday of March. 1670# 1671Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 - 1672# IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger. 1673Rule Para 1997 only - Feb lastSun 0:00 0 - 1674# Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but 1675# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27). 1676Rule Para 1998 2001 - Mar Sun>=1 0:00 0 - 1677# From Rives McDow (2002-02-28): 1678# A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the 1679# dst method to be from the first Sunday in September to the first Sunday in 1680# April. 1681Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - 1682Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 - 1683# 1684# From Jesper Nørgaard Welen (2005-01-02): 1685# There are several sources that claim that Paraguay made 1686# a timezone rule change in autumn 2004. 1687# From Steffen Thorsen (2005-01-05): 1688# Decree 1,867 (2004-03-05) 1689# From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13) 1690# http://www.presidencia.gov.py/decretos/D1867.pdf 1691Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 - 1692Rule Para 2005 2009 - Mar Sun>=8 0:00 0 - 1693# From Carlos Raúl Perasso (2010-02-18): 1694# By decree number 3958 issued yesterday 1695# http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf 1696# Paraguay changes its DST schedule, postponing the March rule to April and 1697# modifying the October date. The decree reads: 1698# ... 1699# Art. 1. It is hereby established that from the second Sunday of the month of 1700# April of this year (2010), the official time is to be set back 60 minutes, 1701# and that on the first Sunday of the month of October, it is to be set 1702# forward 60 minutes, in all the territory of the Paraguayan Republic. 1703# ... 1704Rule Para 2010 max - Oct Sun>=1 0:00 1:00 - 1705Rule Para 2010 2012 - Apr Sun>=8 0:00 0 - 1706# 1707# From Steffen Thorsen (2013-03-07): 1708# Paraguay will end DST on 2013-03-24 00:00.... 1709# http://www.ande.gov.py/interna.php?id=1075 1710# 1711# From Carlos Raúl Perasso (2013-03-15): 1712# The change in Paraguay is now final. Decree number 10780 1713# http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf 1714# From Carlos Raúl Perasso (2014-02-28): 1715# Decree 1264 can be found at: 1716# http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf 1717# 1718# From Paul Eggert (2023-07-26): 1719# Transition dates are now set by Law No. 7115, not by presidential decree. 1720# https://www.abc.com.py/politica/2023/07/12/promulgacion-el-cambio-de-hora-sera-por-ley/ 1721# From Carlos Raúl Perasso (2023-07-27): 1722# http://silpy.congreso.gov.py/descarga/ley-144138 1723Rule Para 2013 max - Mar Sun>=22 0:00 0 - 1724 1725# Zone NAME STDOFF RULES FORMAT [UNTIL] 1726Zone America/Asuncion -3:50:40 - LMT 1890 1727 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time 1728 -4:00 - -04 1972 Oct 1729 -3:00 - -03 1974 Apr 1730 -4:00 Para -04/-03 1731 1732# Peru 1733# 1734# From Evelyn C. Leeper via Mark Brader (2003-10-26) 1735# <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>: 1736# When we were in Peru in 1985-1986, they apparently switched over 1737# sometime between December 29 and January 3 while we were on the Amazon. 1738# 1739# From Paul Eggert (2006-03-22): 1740# Shanks & Pottenger don't have this transition. Assume 1986 was like 1987. 1741 1742# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1743Rule Peru 1938 only - Jan 1 0:00 1:00 - 1744Rule Peru 1938 only - Apr 1 0:00 0 - 1745Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 - 1746Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 1747Rule Peru 1986 1987 - Jan 1 0:00 1:00 - 1748Rule Peru 1986 1987 - Apr 1 0:00 0 - 1749Rule Peru 1990 only - Jan 1 0:00 1:00 - 1750Rule Peru 1990 only - Apr 1 0:00 0 - 1751# IATA is ambiguous for 1993/1995; go with Shanks & Pottenger. 1752Rule Peru 1994 only - Jan 1 0:00 1:00 - 1753Rule Peru 1994 only - Apr 1 0:00 0 - 1754# Zone NAME STDOFF RULES FORMAT [UNTIL] 1755Zone America/Lima -5:08:12 - LMT 1890 1756 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time? 1757 -5:00 Peru -05/-04 1758 1759# South Georgia 1760# Zone NAME STDOFF RULES FORMAT [UNTIL] 1761Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 1762 -2:00 - -02 1763 1764# South Sandwich Is 1765# uninhabited; scientific personnel have wintered 1766 1767# Suriname 1768# Zone NAME STDOFF RULES FORMAT [UNTIL] 1769Zone America/Paramaribo -3:40:40 - LMT 1911 1770 -3:40:52 - PMT 1935 # Paramaribo Mean Time 1771 -3:40:36 - PMT 1945 Oct # The capital moved? 1772 -3:30 - -0330 1984 Oct 1773 -3:00 - -03 1774 1775# Trinidad and Tobago 1776# Zone NAME STDOFF RULES FORMAT [UNTIL] 1777Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 1778 -4:00 - AST 1779 1780Link America/Port_of_Spain America/Marigot 1781Link America/Port_of_Spain America/St_Barthelemy 1782# Uruguay 1783# From Paul Eggert (1993-11-18): 1784# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 1785# 1786# From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael 1787# Deckers (2018-02-20): 1788# ... At least they kept good records... 1789# 1790# http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36 1791# Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and 1792# Meteorology Service of the Uruguayan Navy, seems to give many transitions 1793# with greater clarity than we've had before. It directly references many laws 1794# and decrees which are, in turn, referenced below. They can be viewed in the 1795# public archives of the Diario Oficial (in Spanish) at 1796# http://www.impo.com.uy/diariooficial/ 1797# 1798# Ley No. 3920 of 1908-06-10 placed the determination of legal time under the 1799# auspices of the National Institute for the Prediction of Time. It is unclear 1800# exactly what offset was used during this period, though Ley No. 7200 of 1801# 1920-04-23 used the Observatory of the National Meteorological Institute in 1802# Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian, 1803# retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00, 1804# resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on 1805# page 725 of the Proceedings of the Second Pan-American Scientific Congress, 1806# 1915-1916) was in use, and merely became official from 1908-06-10. 1807# https://www.impo.com.uy/diariooficial/1908/06/18/12 1808# https://www.impo.com.uy/diariooficial/1920/04/27/9 1809# 1810# Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced 1811# by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14 1812# minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the 1813# National Council of Administration the same day, published directly below the 1814# law in the Diario Oficial, specified the first transition to be 1923-09-30 1815# 24:00. This effectively established standard time at UT-03:30 with 30 1816# minutes DST. Assume transitions at 24:00 on the specified days until Ley No. 1817# 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other 1818# provisions which oppose" it, resulting in year-round UT-03:30; a Resolución 1819# of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it 1820# would have been under the previous law. 1821# https://www.impo.com.uy/diariooficial/1923/07/02/2 1822# https://www.impo.com.uy/diariooficial/1926/03/10/2 1823# https://www.impo.com.uy/diariooficial/1926/03/18/2 1824# 1825# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1826Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 - 1827Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 1828# From Tim Parenti (2018-02-15): 1829# http://www.impo.com.uy/diariooficial/1933/10/27/6 1830# 1831# It appears Ley No. 9122 of 1933 was never published as such in the Diario 1832# Oficial, but instead appeared as Document 26 in the Diario on Friday 1833# 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of 1834# National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the 1835# last Sunday of October...until the last Saturday of March." In accordance 1836# with this provision, the first transition was explicitly specified in Article 1837# 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29 1838# at 00:00. Assume transitions at 00:00 Sunday throughout. 1839# 1840# Departing from the matter-of-fact nature of previous timekeeping laws, the 1841# 1933 decree "consider[s] the advantages of...the advance of legal time": 1842# 1843# "Whereas: The measure adopted by almost all nations at the time of the last 1844# World War still persists in North America and Europe, precisely because of 1845# the economic, hygienic, and social advantages derived from such an 1846# emergency measure... 1847# 1848# Whereas: The advance of the legal time during the summer seasons, by 1849# displacing social activity near sunrise, favors the citizen populations 1850# and especially the society that creates and works..." 1851# 1852# It further specified that "necessary measures" be taken to ensure that 1853# "public spectacles finish, in general, before [01:00]." 1854Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 - 1855Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 - 1856# From Tim Parenti (2018-02-15): 1857# Most of the Rules below, and their contemporaneous Zone lines, have been 1858# updated simply to match the Almanaque 2018. Although the document does not 1859# list exact transition times, midnight transitions were already present in our 1860# data here for all transitions through 2004-09, and this is both consistent 1861# with prior transitions and verified in several decrees marked below between 1862# 1939-09 and 2004-09, wherein the relevant text was typically of the form: 1863# 1864# "From 0 hours on [date], the legal time of the entire Republic will be... 1865# 1866# In accordance with [the preceding], on [previous date] at 24 hours, all 1867# clocks throughout the Republic will be [advanced/retarded] by..." 1868# 1869# It is possible that there is greater specificity to be found for the Rules 1870# below, but it is buried in no fewer than 40 different decrees individually 1871# referenced by the Almanaque for the period from 1939-09 to 2014-09. 1872# Four-fifths of these were promulgated less than two weeks before taking 1873# effect; more than half within a week and none more than 5 weeks. Only the 1874# handful with comments below have been checked with any thoroughness. 1875Rule Uruguay 1939 only - Oct 1 0:00 0:30 - 1876Rule Uruguay 1940 only - Oct 27 0:00 0:30 - 1877# From Tim Parenti (2018-02-15): 1878# Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified 1879# UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel". 1880# http://www.impo.com.uy/diariooficial/1941/08/04/1 1881Rule Uruguay 1941 only - Aug 1 0:00 0:30 - 1882# From Tim Parenti (2018-02-15): 1883# Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified 1884# further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks 1885# never went back to UT-03:30 thereafter, this is modeled as advancing standard 1886# time by 30 minutes to UT-03, while retaining 30 minutes of DST. 1887# http://www.impo.com.uy/diariooficial/1942/12/16/3 1888Rule Uruguay 1942 only - Dec 14 0:00 0:30 - 1889Rule Uruguay 1943 only - Mar 14 0:00 0 - 1890Rule Uruguay 1959 only - May 24 0:00 0:30 - 1891Rule Uruguay 1959 only - Nov 15 0:00 0 - 1892Rule Uruguay 1960 only - Jan 17 0:00 1:00 - 1893Rule Uruguay 1960 only - Mar 6 0:00 0 - 1894Rule Uruguay 1965 only - Apr 4 0:00 1:00 - 1895Rule Uruguay 1965 only - Sep 26 0:00 0 - 1896# From Tim Parenti (2018-02-15): 1897# Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the 1898# day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00. 1899# http://www.impo.com.uy/diariooficial/1968/05/30/5 1900Rule Uruguay 1968 only - May 27 0:00 0:30 - 1901Rule Uruguay 1968 only - Dec 1 0:00 0 - 1902# From Tim Parenti (2018-02-15): 1903# Decreto 188/970 of 1970-04-23 instituted restrictions on electricity 1904# consumption "as a consequence of the current rainfall regime in the country". 1905# Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00. 1906# http://www.impo.com.uy/diariooficial/1970/04/29/4 1907Rule Uruguay 1970 only - Apr 25 0:00 1:00 - 1908Rule Uruguay 1970 only - Jun 14 0:00 0 - 1909Rule Uruguay 1972 only - Apr 23 0:00 1:00 - 1910Rule Uruguay 1972 only - Jul 16 0:00 0 - 1911# From Tim Parenti (2018-02-15): 1912# Decreto 29/974 of 1974-01-11, citing "the international rise in the price of 1913# oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of 1914# 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30 1915# minutes followed in Decreto 679/974 of 1974-08-29. 1916# http://www.impo.com.uy/diariooficial/1974/01/22/11 1917# http://www.impo.com.uy/diariooficial/1974/03/14/3 1918# http://www.impo.com.uy/diariooficial/1974/09/04/6 1919Rule Uruguay 1974 only - Jan 13 0:00 1:30 - 1920Rule Uruguay 1974 only - Mar 10 0:00 0:30 - 1921Rule Uruguay 1974 only - Sep 1 0:00 0 - 1922Rule Uruguay 1974 only - Dec 22 0:00 1:00 - 1923Rule Uruguay 1975 only - Mar 30 0:00 0 - 1924Rule Uruguay 1976 only - Dec 19 0:00 1:00 - 1925Rule Uruguay 1977 only - Mar 6 0:00 0 - 1926Rule Uruguay 1977 only - Dec 4 0:00 1:00 - 1927Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 - 1928Rule Uruguay 1978 only - Dec 17 0:00 1:00 - 1929Rule Uruguay 1979 only - Apr 29 0:00 1:00 - 1930Rule Uruguay 1980 only - Mar 16 0:00 0 - 1931# From Tim Parenti (2018-02-15): 1932# Decreto 725/987 of 1987-12-04 cited "better use of national tourist 1933# attractions" to advance clocks one hour from Monday 1987-12-14 00:00. 1934# http://www.impo.com.uy/diariooficial/1988/01/25/1 1935Rule Uruguay 1987 only - Dec 14 0:00 1:00 - 1936Rule Uruguay 1988 only - Feb 28 0:00 0 - 1937Rule Uruguay 1988 only - Dec 11 0:00 1:00 - 1938Rule Uruguay 1989 only - Mar 5 0:00 0 - 1939Rule Uruguay 1989 only - Oct 29 0:00 1:00 - 1940Rule Uruguay 1990 only - Feb 25 0:00 0 - 1941# From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04): 1942# IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the 1943# 1992/1993 season appears to be the first in over half a century where DST 1944# both began and ended pursuant to the same decree. 1945Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 - 1946Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 - 1947Rule Uruguay 1992 only - Oct 18 0:00 1:00 - 1948Rule Uruguay 1993 only - Feb 28 0:00 0 - 1949# From Eduardo Cota (2004-09-20): 1950# The Uruguayan government has decreed a change in the local time.... 1951# From Tim Parenti (2018-02-15): 1952# Decreto 328/004 of 2004-09-15. 1953# http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1 1954Rule Uruguay 2004 only - Sep 19 0:00 1:00 - 1955# From Steffen Thorsen (2005-03-11): 1956# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to 1957# save energy ... it was postponed two weeks.... 1958# From Tim Parenti (2018-02-15): 1959# This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous 1960# reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending 1961# Decreto 328/004: 1962# http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1 1963# The original decree specified a transition of 2005-03-12 24:00, but the new 1964# one specified 2005-03-27 02:00. 1965Rule Uruguay 2005 only - Mar 27 2:00 0 - 1966# From Eduardo Cota (2005-09-27): 1967# ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time, 1968# official time in Uruguay will be at GMT -2. 1969# From Tim Parenti (2018-02-15): 1970# Decreto 318/005 of 2005-09-19. 1971# http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1 1972Rule Uruguay 2005 only - Oct 9 2:00 1:00 - 1973Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 - 1974# From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06): 1975# Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday 1976# of October at 02:00 through the second Sunday of March at 02:00. Almanaque 1977# 2018 appears to have a few typoed dates through this period; ignore them. 1978# http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1 1979Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - 1980# From Steffen Thorsen (2015-06-30): 1981# ... it looks like they will not be using DST the coming summer: 1982# http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 1983# http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/ 1984# From Paul Eggert (2015-06-30): 1985# Apparently restaurateurs complained that DST caused people to go to the beach 1986# instead of out to dinner. 1987# From Pablo Camargo (2015-07-13): 1988# http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf 1989# From Tim Parenti (2018-02-15): 1990# Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. 1991 1992# This Zone can be simplified once we assume zic %z. 1993Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10 1994 -3:44:51 - MMT 1920 May 1 # Montevideo MT 1995 -4:00 - -04 1923 Oct 1 1996 -3:30 Uruguay -0330/-03 1942 Dec 14 1997 -3:00 Uruguay -03/-0230 1960 1998 -3:00 Uruguay -03/-02 1968 1999 -3:00 Uruguay -03/-0230 1970 2000 -3:00 Uruguay -03/-02 1974 2001 -3:00 Uruguay -03/-0130 1974 Mar 10 2002 -3:00 Uruguay -03/-0230 1974 Dec 22 2003 -3:00 Uruguay -03/-02 2004 2005# Venezuela 2006# 2007# From Paul Eggert (2015-07-28): 2008# For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533 2009# http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf 2010# 2011# From John Stainforth (2007-11-28): 2012# ... the change for Venezuela originally expected for 2007-12-31 has 2013# been brought forward to 2007-12-09. The official announcement was 2014# published today in the "Gaceta Oficial de la República Bolivariana 2015# de Venezuela, número 38.819" (official document for all laws or 2016# resolution publication) 2017# http://www.globovision.com/news.php?nid=72208 2018 2019# From Alexander Krivenyshev (2016-04-15): 2020# https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino 2021# 2022# From Paul Eggert (2016-04-15): 2023# Clocks advance 30 minutes on 2016-05-01 at 02:30.... 2024# "'Venezuela's new time-zone: hours without light, hours without water, 2025# hours of presidential broadcasts, hours of lines,' quipped comedian 2026# Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps 2027# half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400 2028# https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE 2029# 2030# From Matt Johnson (2016-04-20): 2031# ... published in the official Gazette [2016-04-18], here: 2032# http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf 2033 2034# Zone NAME STDOFF RULES FORMAT [UNTIL] 2035Zone America/Caracas -4:27:44 - LMT 1890 2036 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? 2037 -4:30 - -0430 1965 Jan 1 0:00 2038 -4:00 - -04 2007 Dec 9 3:00 2039 -4:30 - -0430 2016 May 1 2:30 2040 -4:00 - -04 2041
