1# tzdb data for South America and environs 2 3# This file is in the public domain, so clarified as of 4# 2009-05-17 by Arthur David Olson. 5 6# This file is by no means authoritative; if you think you know better, 7# go ahead and edit the file (and please send any changes to 8# tz@iana.org for general use in the future). For more, please see 9# the file CONTRIBUTING in the tz distribution. 10 11# From Paul Eggert (2016-12-05): 12# 13# Unless otherwise specified, the source for data through 1990 is: 14# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 15# San Diego: ACS Publications, Inc. (2003). 16# Unfortunately this book contains many errors and cites no sources. 17# 18# Many years ago Gwillim Law wrote that a good source 19# for time zone data was the International Air Transport 20# Association's Standard Schedules Information Manual (IATA SSIM), 21# published semiannually. Law sent in several helpful summaries 22# of the IATA's data after 1990. Except where otherwise noted, 23# IATA SSIM is the source for entries after 1990. 24# 25# For data circa 1899, a common source is: 26# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. 27# https://www.jstor.org/stable/1774359 28# 29# These tables use numeric abbreviations like -03 and -0330 for 30# integer hour and minute UT offsets. Although earlier editions used 31# alphabetic time zone abbreviations, these abbreviations were 32# invented and did not reflect common practice. 33 34############################################################################### 35 36############################################################################### 37 38# Argentina 39 40# From Bob Devine (1988-01-28): 41# Argentina: first Sunday in October to first Sunday in April since 1976. 42# Double Summer time from 1969 to 1974. Switches at midnight. 43 44# From U. S. Naval Observatory (1988-01-19): 45# ARGENTINA 3 H BEHIND UTC 46 47# From Hernan G. Otero (1995-06-26): 48# I am sending modifications to the Argentine time zone table... 49# AR was chosen because they are the ISO letters that represent Argentina. 50 51# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 52Rule Arg 1930 only - Dec 1 0:00 1:00 - 53Rule Arg 1931 only - Apr 1 0:00 0 - 54Rule Arg 1931 only - Oct 15 0:00 1:00 - 55Rule Arg 1932 1940 - Mar 1 0:00 0 - 56Rule Arg 1932 1939 - Nov 1 0:00 1:00 - 57Rule Arg 1940 only - Jul 1 0:00 1:00 - 58Rule Arg 1941 only - Jun 15 0:00 0 - 59Rule Arg 1941 only - Oct 15 0:00 1:00 - 60Rule Arg 1943 only - Aug 1 0:00 0 - 61Rule Arg 1943 only - Oct 15 0:00 1:00 - 62Rule Arg 1946 only - Mar 1 0:00 0 - 63Rule Arg 1946 only - Oct 1 0:00 1:00 - 64Rule Arg 1963 only - Oct 1 0:00 0 - 65Rule Arg 1963 only - Dec 15 0:00 1:00 - 66Rule Arg 1964 1966 - Mar 1 0:00 0 - 67Rule Arg 1964 1966 - Oct 15 0:00 1:00 - 68Rule Arg 1967 only - Apr 2 0:00 0 - 69Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 - 70Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 - 71Rule Arg 1974 only - Jan 23 0:00 1:00 - 72Rule Arg 1974 only - May 1 0:00 0 - 73Rule Arg 1988 only - Dec 1 0:00 1:00 - 74# 75# From Hernan G. Otero (1995-06-26): 76# These corrections were contributed by InterSoft Argentina S.A., 77# obtaining the data from the: 78# Talleres de Hidrografía Naval Argentina 79# (Argentine Naval Hydrography Institute) 80Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 81Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 - 82# 83# From Hernan G. Otero (1995-06-26): 84# From this moment on, the law that mandated the daylight saving 85# time corrections was derogated and no more modifications 86# to the time zones (for daylight saving) are now made. 87# 88# From Rives McDow (2000-01-10): 89# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time, 90# which did not result in the switch of a time zone, as they stayed 9 hours 91# from the International Date Line. 92Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 - 93# From Paul Eggert (2007-12-28): 94# DST was set to expire on March 5, not March 3, but since it was converted 95# to standard time on March 3 it's more convenient for us to pretend that 96# it ended on March 3. 97Rule Arg 2000 only - Mar 3 0:00 0 - 98# 99# From Peter Gradelski via Steffen Thorsen (2000-03-01): 100# We just checked with our São Paulo office and they say the government of 101# Argentina decided not to become one of the countries that go on or off DST. 102# So Buenos Aires should be -3 hours from GMT at all times. 103# 104# From Fabián L. Arce Jofré (2000-04-04): 105# The law that claimed DST for Argentina was derogated by President Fernando 106# de la Rúa on March 2, 2000, because it would make people spend more energy 107# in the winter time, rather than less. The change took effect on March 3. 108# 109# From Mariano Absatz (2001-06-06): 110# one of the major newspapers here in Argentina said that the 1999 111# Timezone Law (which never was effectively applied) will (would?) be 112# in effect.... The article is at 113# http://ar.clarin.com/diario/2001-06-06/e-01701.htm 114# ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted 115# 1999-09-17, and published 1999-09-21. The official publication is at: 116# http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF 117# Regretfully, you have to subscribe (and pay) for the on-line version.... 118# 119# (2001-06-12): 120# the timezone for Argentina will not change next Sunday. 121# Apparently it will do so on Sunday 24th.... 122# http://ar.clarin.com/diario/2001-06-12/s-03501.htm 123# 124# (2001-06-25): 125# Last Friday (yes, the last working day before the date of the change), the 126# Senate annulled the 1999 law that introduced the changes later postponed. 127# http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm 128# It remains the vote of the Deputies..., but it will be the same.... 129# This kind of things had always been done this way in Argentina. 130# We are still -03:00 all year round in all of the country. 131# 132# From Steffen Thorsen (2007-12-21): 133# A user (Leonardo Chaim) reported that Argentina will adopt DST.... 134# all of the country (all Zone-entries) are affected. News reports like 135# http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate 136# that Argentina will use DST next year as well, from October to 137# March, although exact rules are not given. 138# 139# From Jesper Nørgaard Welen (2007-12-26) 140# The last hurdle of Argentina DST is over, the proposal was approved in 141# the lower chamber too (Diputados) with a vote 192 for and 2 against. 142# By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to 143# the original scanned proposal, where the dates and the zero hours are 144# clear and unambiguous...This is the article about final approval: 145# http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996 146# 147# From Paul Eggert (2007-12-22): 148# For dates after mid-2008, the following rules are my guesses and 149# are quite possibly wrong, but are more likely than no DST at all. 150 151# From Alexander Krivenyshev (2008-09-05): 152# As per message from Carlos Alberto Fonseca Arauz (Nicaragua), 153# Argentina will start DST on Sunday October 19, 2008. 154# 155# http://www.worldtimezone.com/dst_news/dst_news_argentina03.html 156# http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish) 157 158# From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07) 159# via Rodrigo Severo: 160# Argentinian law No. 25.155 is no longer valid. 161# http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm 162# The new one is law No. 26.350 163# http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm 164# So there is no summer time in Argentina for now. 165 166# From Mariano Absatz (2008-10-20): 167# Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST 168# in Argentina from 2008-10-19 until 2009-03-15. 169# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01 170# 171 172# Decree 1705/2008 excepting 12 Provinces from applying DST in the summer 173# 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La 174# Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego 175# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01 176# 177# Press release 235 dated Saturday October 18th, from the Government of the 178# Province of Jujuy saying it will not apply DST either (even when it was not 179# included in Decree 1705/2008). 180# http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc 181 182# From fullinet (2009-10-18): 183# As announced in 184# http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356 185# (an official .gob.ar) under title: "Sin Cambio de Hora" 186# (English: "No hour change"). 187# 188# "Por el momento, el Gobierno Nacional resolvió no modificar la hora 189# oficial, decisión que estaba en estudio para su implementación el 190# domingo 18 de octubre. Desde el Ministerio de Planificación se anunció 191# que la Argentina hoy, en estas condiciones meteorológicas, no necesita 192# la modificación del huso horario, ya que 2009 nos encuentra con 193# crecimiento en la producción y distribución energética." 194 195Rule Arg 2007 only - Dec 30 0:00 1:00 - 196Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 - 197Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 - 198 199# From Mariano Absatz (2004-05-21): 200# Today it was officially published that the Province of Mendoza is changing 201# its timezone this winter... starting tomorrow night.... 202# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf 203# From Paul Eggert (2004-05-24): 204# It's Law No. 7,210. This change is due to a public power emergency, so for 205# now we'll assume it's for this year only. 206# 207# From Paul Eggert (2018-01-31): 208# Hora de verano para la República Argentina 209# http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html 210# says that standard time in Argentina from 1894-10-31 211# to 1920-05-01 was -4:16:48.25. Go with this more-precise value 212# over Shanks & Pottenger. It is upward compatible with Milne, who 213# says Córdoba time was -4:16:48.2. 214 215# 216# From Mariano Absatz (2004-06-05): 217# These media articles from a major newspaper mostly cover the current state: 218# http://www.lanacion.com.ar/04/05/27/de_604825.asp 219# http://www.lanacion.com.ar/04/05/28/de_605203.asp 220# 221# The following eight (8) provinces pulled clocks back to UTC-04:00 at 222# midnight Monday May 31st. (that is, the night between 05/31 and 06/01). 223# Apparently, all nine provinces would go back to UTC-03:00 at the same 224# time in October 17th. 225# 226# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz, 227# Tierra del Fuego, Tucumán. 228# 229# From Mariano Absatz (2004-06-14): 230# ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00 231# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's 232# annoyance with the change is much higher than the power savings obtained.... 233# 234# From Gwillim Law (2004-06-14): 235# http://www.lanacion.com.ar/04/06/10/de_609078.asp ... 236# "The time change in Tierra del Fuego was a conflicted decision from 237# the start. The government had decreed that the measure would take 238# effect on June 1, but a normative error forced the new time to begin 239# three days earlier, from a Saturday to a Sunday.... 240# Our understanding was that the change was originally scheduled to take place 241# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other 242# provinces). Sunday was May 30, only two days earlier. So the article 243# contains a contradiction. I would give more credence to the Saturday/Sunday 244# date than the "three days earlier" phrase, and conclude that Tierra del 245# Fuego set its clocks back at 2004-05-30 00:00. 246# 247# From Steffen Thorsen (2004-10-05): 248# The previous law 7210 which changed the province of Mendoza's time zone 249# back in May have been modified slightly in a new law 7277, which set the 250# new end date to 2004-09-26 (original date was 2004-10-17). 251# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf 252# 253# From Mariano Absatz (2004-10-05): 254# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between 255# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00 256# at midnight between Saturday, July 24th and Sunday, July 25th.... 257# http://www.sanjuan.gov.ar/prensa/archivo/000329.html 258# http://www.sanjuan.gov.ar/prensa/archivo/000426.html 259# http://www.sanjuan.gov.ar/prensa/archivo/000441.html 260 261# From Alex Krivenyshev (2008-01-17): 262# Here are articles that Argentina Province San Luis is planning to end DST 263# as earlier as upcoming Monday January 21, 2008 or February 2008: 264# 265# Provincia argentina retrasa reloj y marca diferencia con resto del país 266# (Argentine Province delayed clock and mark difference with the rest of the 267# country) 268# http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel 269# 270# Es inminente que en San Luis atrasen una hora los relojes 271# (It is imminent in San Luis clocks one hour delay) 272# https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html 273# http://www.worldtimezone.com/dst_news/dst_news_argentina02.html 274 275# From Jesper Nørgaard Welen (2008-01-18): 276# The page of the San Luis provincial government 277# http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812 278# confirms what Alex Krivenyshev has earlier sent to the tz 279# emailing list about that San Luis plans to return to standard 280# time much earlier than the rest of the country. It also 281# confirms that upon request the provinces San Juan and Mendoza 282# refused to follow San Luis in this change. 283# 284# The change is supposed to take place Monday the 21st at 0:00 285# hours. As far as I understand it if this goes ahead, we need 286# a new timezone for San Luis (although there are also documented 287# independent changes in the southamerica file of San Luis in 288# 1990 and 1991 which has not been confirmed). 289 290# From Jesper Nørgaard Welen (2008-01-25): 291# Unfortunately the below page has become defunct, about the San Luis 292# time change. Perhaps because it now is part of a group of pages "Most 293# important pages of 2008." 294# 295# You can use 296# http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834 297# instead it seems. Or use "Buscador" from the main page of the San Luis 298# government, and fill in "huso" and click OK, and you will get 3 pages 299# from which the first one is identical to the above. 300 301# From Mariano Absatz (2008-01-28): 302# I can confirm that the Province of San Luis (and so far only that 303# province) decided to go back to UTC-3 effective midnight Jan 20th 2008 304# (that is, Monday 21st at 0:00 is the time the clocks were delayed back 305# 1 hour), and they intend to keep UTC-3 as their timezone all year round 306# (that is, unless they change their mind any minute now). 307# 308# So we'll have to add yet another city to 'southamerica' (I think San 309# Luis city is the mos populated city in the Province, so it'd be 310# America/Argentina/San_Luis... of course I can't remember if San Luis's 311# history of particular changes goes along with Mendoza or San Juan :-( 312# (I only remember not being able to collect hard facts about San Luis 313# back in 2004, when these provinces changed to UTC-4 for a few days, I 314# mailed them personally and never got an answer). 315 316# From Paul Eggert (2014-08-12): 317# Unless otherwise specified, data entries are from Shanks & Pottenger through 318# 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that 319# America/Cordoba split into 6 subregions during 1991/1992, one of which 320# was America/San_Luis, but we haven't verified this yet so for now we'll 321# keep America/Cordoba a single region rather than splitting it into the 322# other 5 subregions. 323 324# From Mariano Absatz (2009-03-13): 325# Yesterday (with our usual 2-day notice) the Province of San Luis 326# decided that next Sunday instead of "staying" @utc-03:00 they will go 327# to utc-04:00 until the second Saturday in October... 328# 329# The press release is at 330# http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102 331# (I couldn't find the decree, but www.sanluis.gov.ar 332# is the official page for the Province Government.) 333# 334# There's also a note in only one of the major national papers ... 335# http://www.lanacion.com.ar/nota.asp?nota_id=1107912 336# 337# The press release says [quick and dirty translation]: 338# ... announced that next Sunday, at 00:00, Puntanos (the San Luis 339# inhabitants) will have to turn back one hour their clocks 340# 341# Since then, San Luis will establish its own Province timezone. Thus, 342# during 2009, this timezone change will run from 00:00 the third Sunday 343# in March until 24:00 of the second Saturday in October. 344 345# From Mariano Absatz (2009-10-16): 346# ...the Province of San Luis is a case in itself. 347# 348# The Law at 349# http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276 350# is ambiguous because establishes a calendar from the 2nd Sunday in 351# October at 0:00 thru the 2nd Saturday in March at 24:00 and the 352# complement of that starting on the 2nd Sunday of March at 0:00 and 353# ending on the 2nd Saturday of March at 24:00. 354# 355# This clearly breaks every time the 1st of March or October is a Sunday. 356# 357# IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd 358# Sunday of October and March. 359# 360# The problem is that the changes in the rest of the Provinces that did 361# change in 2007/2008, were made according to the Federal Law and Decrees 362# that did so on the 3rd Sunday of October and March. 363# 364# In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday 365# (October 11th) at 0:00. 366# 367# So I guess a new set of rules, besides "Arg", must be made and the last 368# America/Argentina/San_Luis entries should change to use these... 369# ... 370 371# From Alexander Krivenyshev (2010-04-09): 372# According to news reports from El Diario de la República Province San 373# Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time 374# after April 11, 2010 - will continue to have same time as rest of 375# Argentina (UTC-3) (no DST). 376# 377# Confirmaron la prórroga del huso horario de verano (Spanish) 378# http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9 379# or (some English translation): 380# http://www.worldtimezone.com/dst_news/dst_news_argentina08.html 381 382# From Mariano Absatz (2010-04-12): 383# yes...I can confirm this...and given that San Luis keeps calling 384# UTC-03:00 "summer time", we should't just let San Luis go back to "Arg" 385# rules...San Luis is still using "Western ARgentina Time" and it got 386# stuck on Summer daylight savings time even though the summer is over. 387 388# From Paul Eggert (2018-01-23): 389# Perhaps San Luis operates on the legal fiction that it is at -04 390# with perpetual daylight saving time, but ordinary usage typically seems to 391# just say it's at -03; see, for example, 392# https://es.wikipedia.org/wiki/Hora_oficial_argentina 393# We've documented similar situations as being plain changes to 394# standard time, so let's do that here too. This does not change UTC 395# offsets, only tm_isdst and the time zone abbreviations. One minor 396# plus is that this silences a zic complaint that there's no POSIX TZ 397# setting for timestamps past 2038. 398 399# Zone NAME STDOFF RULES FORMAT [UNTIL] 400# 401# Buenos Aires (BA), Capital Federal (CF), 402Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31 403 -4:16:48 - CMT 1920 May # Córdoba Mean Time 404 -4:00 - -04 1930 Dec 405 -4:00 Arg -04/-03 1969 Oct 5 406 -3:00 Arg -03/-02 1999 Oct 3 407 -4:00 Arg -04/-03 2000 Mar 3 408 -3:00 Arg -03/-02 409# 410# Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN), 411# Chaco (CC), Formosa (FM), Santiago del Estero (SE) 412# 413# Shanks & Pottenger also make the following claims, which we haven't verified: 414# - Formosa switched to -3:00 on 1991-01-07. 415# - Misiones switched to -3:00 on 1990-12-29. 416# - Chaco switched to -3:00 on 1991-01-04. 417# - Santiago del Estero switched to -4:00 on 1991-04-01, 418# then to -3:00 on 1991-04-26. 419# 420Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31 421 -4:16:48 - CMT 1920 May 422 -4:00 - -04 1930 Dec 423 -4:00 Arg -04/-03 1969 Oct 5 424 -3:00 Arg -03/-02 1991 Mar 3 425 -4:00 - -04 1991 Oct 20 426 -3:00 Arg -03/-02 1999 Oct 3 427 -4:00 Arg -04/-03 2000 Mar 3 428 -3:00 Arg -03/-02 429# 430# Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN) 431Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31 432 -4:16:48 - CMT 1920 May 433 -4:00 - -04 1930 Dec 434 -4:00 Arg -04/-03 1969 Oct 5 435 -3:00 Arg -03/-02 1991 Mar 3 436 -4:00 - -04 1991 Oct 20 437 -3:00 Arg -03/-02 1999 Oct 3 438 -4:00 Arg -04/-03 2000 Mar 3 439 -3:00 Arg -03/-02 2008 Oct 18 440 -3:00 - -03 441# 442# Tucumán (TM) 443Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31 444 -4:16:48 - CMT 1920 May 445 -4:00 - -04 1930 Dec 446 -4:00 Arg -04/-03 1969 Oct 5 447 -3:00 Arg -03/-02 1991 Mar 3 448 -4:00 - -04 1991 Oct 20 449 -3:00 Arg -03/-02 1999 Oct 3 450 -4:00 Arg -04/-03 2000 Mar 3 451 -3:00 - -03 2004 Jun 1 452 -4:00 - -04 2004 Jun 13 453 -3:00 Arg -03/-02 454# 455# La Rioja (LR) 456Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31 457 -4:16:48 - CMT 1920 May 458 -4:00 - -04 1930 Dec 459 -4:00 Arg -04/-03 1969 Oct 5 460 -3:00 Arg -03/-02 1991 Mar 1 461 -4:00 - -04 1991 May 7 462 -3:00 Arg -03/-02 1999 Oct 3 463 -4:00 Arg -04/-03 2000 Mar 3 464 -3:00 - -03 2004 Jun 1 465 -4:00 - -04 2004 Jun 20 466 -3:00 Arg -03/-02 2008 Oct 18 467 -3:00 - -03 468# 469# San Juan (SJ) 470Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31 471 -4:16:48 - CMT 1920 May 472 -4:00 - -04 1930 Dec 473 -4:00 Arg -04/-03 1969 Oct 5 474 -3:00 Arg -03/-02 1991 Mar 1 475 -4:00 - -04 1991 May 7 476 -3:00 Arg -03/-02 1999 Oct 3 477 -4:00 Arg -04/-03 2000 Mar 3 478 -3:00 - -03 2004 May 31 479 -4:00 - -04 2004 Jul 25 480 -3:00 Arg -03/-02 2008 Oct 18 481 -3:00 - -03 482# 483# Jujuy (JY) 484Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31 485 -4:16:48 - CMT 1920 May 486 -4:00 - -04 1930 Dec 487 -4:00 Arg -04/-03 1969 Oct 5 488 -3:00 Arg -03/-02 1990 Mar 4 489 -4:00 - -04 1990 Oct 28 490 -4:00 1:00 -03 1991 Mar 17 491 -4:00 - -04 1991 Oct 6 492 -3:00 1:00 -02 1992 493 -3:00 Arg -03/-02 1999 Oct 3 494 -4:00 Arg -04/-03 2000 Mar 3 495 -3:00 Arg -03/-02 2008 Oct 18 496 -3:00 - -03 497# 498# Catamarca (CT), Chubut (CH) 499Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 500 -4:16:48 - CMT 1920 May 501 -4:00 - -04 1930 Dec 502 -4:00 Arg -04/-03 1969 Oct 5 503 -3:00 Arg -03/-02 1991 Mar 3 504 -4:00 - -04 1991 Oct 20 505 -3:00 Arg -03/-02 1999 Oct 3 506 -4:00 Arg -04/-03 2000 Mar 3 507 -3:00 - -03 2004 Jun 1 508 -4:00 - -04 2004 Jun 20 509 -3:00 Arg -03/-02 2008 Oct 18 510 -3:00 - -03 511# 512# Mendoza (MZ) 513Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31 514 -4:16:48 - CMT 1920 May 515 -4:00 - -04 1930 Dec 516 -4:00 Arg -04/-03 1969 Oct 5 517 -3:00 Arg -03/-02 1990 Mar 4 518 -4:00 - -04 1990 Oct 15 519 -4:00 1:00 -03 1991 Mar 1 520 -4:00 - -04 1991 Oct 15 521 -4:00 1:00 -03 1992 Mar 1 522 -4:00 - -04 1992 Oct 18 523 -3:00 Arg -03/-02 1999 Oct 3 524 -4:00 Arg -04/-03 2000 Mar 3 525 -3:00 - -03 2004 May 23 526 -4:00 - -04 2004 Sep 26 527 -3:00 Arg -03/-02 2008 Oct 18 528 -3:00 - -03 529# 530# San Luis (SL) 531 532Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 - 533Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 - 534 535Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31 536 -4:16:48 - CMT 1920 May 537 -4:00 - -04 1930 Dec 538 -4:00 Arg -04/-03 1969 Oct 5 539 -3:00 Arg -03/-02 1990 540 -3:00 1:00 -02 1990 Mar 14 541 -4:00 - -04 1990 Oct 15 542 -4:00 1:00 -03 1991 Mar 1 543 -4:00 - -04 1991 Jun 1 544 -3:00 - -03 1999 Oct 3 545 -4:00 1:00 -03 2000 Mar 3 546 -3:00 - -03 2004 May 31 547 -4:00 - -04 2004 Jul 25 548 -3:00 Arg -03/-02 2008 Jan 21 549 -4:00 SanLuis -04/-03 2009 Oct 11 550 -3:00 - -03 551# 552# Santa Cruz (SC) 553Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 554 -4:16:48 - CMT 1920 May 555 -4:00 - -04 1930 Dec 556 -4:00 Arg -04/-03 1969 Oct 5 557 -3:00 Arg -03/-02 1999 Oct 3 558 -4:00 Arg -04/-03 2000 Mar 3 559 -3:00 - -03 2004 Jun 1 560 -4:00 - -04 2004 Jun 20 561 -3:00 Arg -03/-02 2008 Oct 18 562 -3:00 - -03 563# 564# Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF) 565Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 566 -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 May 30 572 -4:00 - -04 2004 Jun 20 573 -3:00 Arg -03/-02 2008 Oct 18 574 -3:00 - -03 575 576# Aruba 577# Zone NAME STDOFF RULES FORMAT [UNTIL] 578Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad 579 -4:30 - -0430 1965 580 -4:00 - AST 581 582# Bolivia 583# Zone NAME STDOFF RULES FORMAT [UNTIL] 584Zone America/La_Paz -4:32:36 - LMT 1890 585 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT 586 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST 587 -4:00 - -04 588 589# Brazil 590 591# From Paul Eggert (1993-11-18): 592# The mayor of Rio recently attempted to change the time zone rules 593# just in his city, in order to leave more summer time for the tourist trade. 594# The rule change lasted only part of the day; 595# the federal government refused to follow the city's rules, and business 596# was in a chaos, so the mayor backed down that afternoon. 597 598# From IATA SSIM (1996-02): 599# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 600# Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ), 601# Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO), 602# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 603# [The last three states are new to this issue of the IATA SSIM.] 604 605# From Gwillim Law (1996-10-07): 606# Geography, history (Tocantins was part of Goiás until 1989), and other 607# sources of time zone information lead me to believe that AL, SE, and TO were 608# always in BR1, and so the only change was whether or not they observed DST.... 609# The earliest issue of the SSIM I have is 2/91. Each issue from then until 610# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 611# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 612# (UTC-4).... The other two time zones given for Brazil are BR3, which is 613# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 614# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 615# become part of the state of Pernambuco). The boundary between BR1 and BR2 616# has never been clearly stated. They've simply been called East and West. 617# However, some conclusions can be drawn from another IATA manual: the Airline 618# Coding Directory, which lists close to 400 airports in Brazil. For each 619# airport it gives a time zone which is coded to the SSIM. From that 620# information, I'm led to conclude that the states of Amapá (AP), Ceará (CE), 621# Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do 622# Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST. 623 624# From Marcos Tadeu (1998-09-27): 625# Brazilian official page <http://pcdsh01.on.br/verao1.html> 626 627# From Jesper Nørgaard (2000-11-03): 628# [For an official list of which regions in Brazil use which time zones, see:] 629# http://pcdsh01.on.br/Fusbr.htm 630# http://pcdsh01.on.br/Fusbrhv.htm 631 632# From Celso Doria via David Madeo (2002-10-09): 633# The reason for the delay this year has to do with elections in Brazil. 634# 635# Unlike in the United States, elections in Brazil are 100% computerized and 636# the results are known almost immediately. Yesterday, it was the first 637# round of the elections when 115 million Brazilians voted for President, 638# Governor, Senators, Federal Deputies, and State Deputies. Nobody is 639# counting (or re-counting) votes anymore and we know there will be a second 640# round for the Presidency and also for some Governors. The 2nd round will 641# take place on October 27th. 642# 643# The reason why the DST will only begin November 3rd is that the thousands 644# of electoral machines used cannot have their time changed, and since the 645# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM, 646# the Government decided to postpone DST, instead of changing the Constitution 647# (maybe, for the next elections, it will be possible to change the clock)... 648 649# From Rodrigo Severo (2004-10-04): 650# It's just the biannual change made necessary by the much hyped, supposedly 651# modern Brazilian eletronic voting machines which, apparently, can't deal 652# with a time change between the first and the second rounds of the elections. 653 654# From Steffen Thorsen (2007-09-20): 655# Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: 656# http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975 657 658# From Paul Schulze (2008-06-24): 659# ...by law number 11.662 of April 24, 2008 (published in the "Diario 660# Oficial da União"...) in Brazil there are changes in the timezones, 661# effective today (00:00am at June 24, 2008) as follows: 662# 663# a) The timezone UTC+5 is extinguished, with all the Acre state and the 664# part of the Amazonas state that had this timezone now being put to the 665# timezone UTC+4 666# b) The whole Pará state now is put at timezone UTC+3, instead of just 667# part of it, as was before. 668# 669# This change follows a proposal of senator Tiao Viana of Acre state, that 670# proposed it due to concerns about open television channels displaying 671# programs inappropriate to youths in the states that had the timezone 672# UTC+5 too early in the night. In the occasion, some more corrections 673# were proposed, trying to unify the timezones of any given state. This 674# change modifies timezone rules defined in decree 2.784 of 18 June, 675# 1913. 676 677# From Rodrigo Severo (2008-06-24): 678# Just correcting the URL: 679# https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008 680# 681# As a result of the above Decree I believe the America/Rio_Branco 682# timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall 683# be created to represent the...west side of the Pará State. I 684# suggest this new timezone be called Santarem as the most 685# important/populated city in the affected area. 686# 687# This new timezone would be the same as the Rio_Branco timezone up to 688# the 2008/06/24 change which would be to UTC-3 instead of UTC-4. 689 690# From Alex Krivenyshev (2008-06-24): 691# This is a quick reference page for New and Old Brazil Time Zones map. 692# http://www.worldtimezone.com/brazil-time-new-old.php 693# 694# - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05 695# (state Acre and the part of the Amazonas will be UTC/GMT-04) - western 696# part of Par state is moving to one timezone UTC-03 (from UTC-04). 697 698# From Paul Eggert (2002-10-10): 699# The official decrees referenced below are mostly taken from 700# Decretos sobre o Horário de Verão no Brasil. 701# http://pcdsh01.on.br/DecHV.html 702 703# From Steffen Thorsen (2008-08-29): 704# As announced by the government and many newspapers in Brazil late 705# yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and 706# it will end on 2009-02-15 (current rule for Brazil is fine). Based on 707# past years experience with the elections, there was a good chance that 708# the start was postponed to November, but it did not happen this year. 709# 710# It has not yet been posted to http://pcdsh01.on.br/DecHV.html 711# 712# An official page about it: 713# http://www.mme.gov.br/site/news/detail.do?newsId=16722 714# Note that this link does not always work directly, but must be accessed 715# by going to 716# http://www.mme.gov.br/first 717# 718# One example link that works directly: 719# http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54 720# (Portuguese) 721# 722# We have a written a short article about it as well: 723# https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html 724# 725# From Alexander Krivenyshev (2011-10-04): 726# State Bahia will return to Daylight savings time this year after 8 years off. 727# The announcement was made by Governor Jaques Wagner in an interview to a 728# television station in Salvador. 729 730# In Portuguese: 731# http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html 732# https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html 733 734# From Guilherme Bernardes Rodrigues (2011-10-07): 735# There is news in the media, however there is still no decree about it. 736# I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the 737# official agency about time in Brazil, and she confirmed that the old rule is 738# still in force. 739 740# From Guilherme Bernardes Rodrigues (2011-10-14) 741# It's official, the President signed a decree that includes Bahia in summer 742# time. 743# [ and in a second message (same day): ] 744# I found the decree. 745# 746# DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011 747# Link : 748# http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6 749 750# From Kelley Cook (2012-10-16): 751# The governor of state of Bahia in Brazil announced on Thursday that 752# due to public pressure, he is reversing the DST policy they implemented 753# last year and will not be going to Summer Time on October 21st.... 754# http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia 755 756# From Rodrigo Severo (2012-10-16): 757# Tocantins state will have DST. 758# https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html 759 760# From Steffen Thorsen (2013-09-20): 761# Tocantins in Brazil is very likely not to observe DST from October.... 762# http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto 763# We will keep this article updated when this is confirmed: 764# https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html 765 766# From Steffen Thorsen (2013-10-17): 767# https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html 768# Senator Jorge Viana announced that Acre will change time zone on November 10. 769# He did not specify the time of the change, nor if western parts of Amazonas 770# will change as well. 771# 772# From Paul Eggert (2013-10-17): 773# For now, assume western Amazonas will change as well. 774 775# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 776# Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01) 777# Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10) 778Rule Brazil 1931 only - Oct 3 11:00 1:00 - 779Rule Brazil 1932 1933 - Apr 1 0:00 0 - 780Rule Brazil 1932 only - Oct 3 0:00 1:00 - 781# Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10) 782# revoked DST. 783# Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24) 784# Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13) 785Rule Brazil 1949 1952 - Dec 1 0:00 1:00 - 786Rule Brazil 1950 only - Apr 16 1:00 0 - 787Rule Brazil 1951 1952 - Apr 1 0:00 0 - 788# Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24) 789Rule Brazil 1953 only - Mar 1 0:00 0 - 790# Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30) 791# revoked DST. 792# Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18) 793# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 794# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 795# Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03) 796# extended the above decree to all of the national territory on 12-09. 797Rule Brazil 1963 only - Dec 9 0:00 1:00 - 798# Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25) 799# extended summer time by one day to 1964-03-01 00:00 (start of school). 800Rule Brazil 1964 only - Mar 1 0:00 0 - 801# Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27) 802Rule Brazil 1965 only - Jan 31 0:00 1:00 - 803Rule Brazil 1965 only - Mar 31 0:00 0 - 804# Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22) 805Rule Brazil 1965 only - Dec 1 0:00 1:00 - 806# Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18) 807Rule Brazil 1966 1968 - Mar 1 0:00 0 - 808Rule Brazil 1966 1967 - Nov 1 0:00 1:00 - 809# Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15) 810# revoked DST. 811# Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27) 812Rule Brazil 1985 only - Nov 2 0:00 1:00 - 813# Decree 92,310 (1986-01-21) 814# Decree 92,463 (1986-03-13) 815Rule Brazil 1986 only - Mar 15 0:00 0 - 816# Decree 93,316 (1986-10-01) 817Rule Brazil 1986 only - Oct 25 0:00 1:00 - 818Rule Brazil 1987 only - Feb 14 0:00 0 - 819# Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22) 820Rule Brazil 1987 only - Oct 25 0:00 1:00 - 821Rule Brazil 1988 only - Feb 7 0:00 0 - 822# Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12) 823# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 824Rule Brazil 1988 only - Oct 16 0:00 1:00 - 825Rule Brazil 1989 only - Jan 29 0:00 0 - 826# Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21) 827# with the same exceptions 828Rule Brazil 1989 only - Oct 15 0:00 1:00 - 829Rule Brazil 1990 only - Feb 11 0:00 0 - 830# Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17) 831# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 832# Decree 99,629 (1990-10-19) adds BA, MT. 833Rule Brazil 1990 only - Oct 21 0:00 1:00 - 834Rule Brazil 1991 only - Feb 17 0:00 0 - 835# Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25) 836# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 837Rule Brazil 1991 only - Oct 20 0:00 1:00 - 838Rule Brazil 1992 only - Feb 9 0:00 0 - 839# Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16) 840# adopted by same states. 841Rule Brazil 1992 only - Oct 25 0:00 1:00 - 842Rule Brazil 1993 only - Jan 31 0:00 0 - 843# Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28) 844# adopted by same states, plus AM. 845# Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22; 846# web page corrected 2004-01-07) adopted by same states, minus AM. 847# Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14) 848# adopted by same states, plus MT and TO. 849# Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13) 850# adds AL, SE. 851Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 - 852Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 853Rule Brazil 1996 only - Feb 11 0:00 0 - 854# Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04) 855# adopted by same states, minus AL, SE. 856Rule Brazil 1996 only - Oct 6 0:00 1:00 - 857Rule Brazil 1997 only - Feb 16 0:00 0 - 858# From Daniel C. Sobral (1998-02-12): 859# In 1997, the DS began on October 6. The stated reason was that 860# because international television networks ignored Brazil's policy on DS, 861# they bought the wrong times on satellite for coverage of Pope's visit. 862# This year, the ending date of DS was postponed to March 1 863# to help dealing with the shortages of electric power. 864# 865# Decree 2,317 (1997-09-04), adopted by same states. 866Rule Brazil 1997 only - Oct 6 0:00 1:00 - 867# Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG> 868# (1998-02-10) 869Rule Brazil 1998 only - Mar 1 0:00 0 - 870# Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11) 871# adopted by the same states as before. 872Rule Brazil 1998 only - Oct 11 0:00 1:00 - 873Rule Brazil 1999 only - Feb 21 0:00 0 - 874# Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif> 875# (1999-08-23) adopted by same states. 876# Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30) 877# adds SE, AL, PB, PE, RN, CE, PI, MA and RR. 878Rule Brazil 1999 only - Oct 3 0:00 1:00 - 879Rule Brazil 2000 only - Feb 27 0:00 0 - 880# Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06) 881# adopted by the same states as before. 882# Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13) 883# repeals DST in PE and RR, effective 2000-10-15 00:00. 884# Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17) 885# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. 886# Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif> 887# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE. 888Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 - 889Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 - 890# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE. 891# 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm> 892Rule Brazil 2002 only - Nov 3 0:00 1:00 - 893# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. 894# 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm> 895Rule Brazil 2003 only - Oct 19 0:00 1:00 - 896# Decree 5,223 (2004-10-01) reestablishes DST in MT. 897# 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm> 898Rule Brazil 2004 only - Nov 2 0:00 1:00 - 899# Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19), 900# adopted by the same states as before. 901Rule Brazil 2005 only - Oct 16 0:00 1:00 - 902# Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03), 903# adopted by the same states as before. 904Rule Brazil 2006 only - Nov 5 0:00 1:00 - 905Rule Brazil 2007 only - Feb 25 0:00 0 - 906# Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26), 907# adopted by the same states as before. 908Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 - 909# From Frederico A. C. Neves (2008-09-10): 910# According to this decree 911# http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm 912# [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the 913# 3rd Feb Sunday. There is an exception on the return date when this is 914# the Carnival Sunday then the return date will be the next Sunday... 915Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 - 916Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - 917# Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13) 918# added Bahia. 919Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - 920# Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15) 921# removed Bahia and added Tocantins. 922# Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30) 923# removed Tocantins. 924Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - 925Rule Brazil 2015 only - Feb Sun>=22 0:00 0 - 926Rule Brazil 2016 2019 - Feb Sun>=15 0:00 0 - 927# From Steffen Thorsen (2017-12-18): 928# According to many media sources, next year's DST start in Brazil will move to 929# the first Sunday of November 930# ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html 931# From Steffen Thorsen (2017-12-20): 932# http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm 933# From Fábio Gomes (2018-10-04): 934# The Brazilian president just announced a new change on this year DST. 935# It was scheduled to start on November 4th and it was changed to November 18th. 936# From Rodrigo Brüning Wessler (2018-10-15): 937# The Brazilian government just announced that the change in DST was 938# canceled.... Maybe the president Michel Temer also woke up one hour 939# earlier today. :) 940Rule Brazil 2018 only - Nov Sun>=1 0:00 1:00 - 941# The last ruleset listed above says that the following states observed DST: 942# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. 943# 944# From Steffen Thorsen (2019-04-05): 945# According to multiple sources the Brazilian president wants to get rid of DST. 946# https://gmconline.com.br/noticias/politica/bolsonaro-horario-de-verao-deve-acabar-este-ano 947# https://g1.globo.com/economia/noticia/2019/04/05/governo-anuncia-fim-do-horario-de-verao.ghtml 948# From Marcus Diniz (2019-04-25): 949# Brazil no longer has DST changes - decree signed today 950# https://g1.globo.com/politica/noticia/2019/04/25/bolsonaro-assina-decreto-que-acaba-com-o-horario-de-verao.ghtml 951# From Daniel Soares de Oliveira (2019-04-26): 952# http://www.planalto.gov.br/ccivil_03/_Ato2019-2022/2019/Decreto/D9772.htm 953 954# Zone NAME STDOFF RULES FORMAT [UNTIL] 955# 956# Fernando de Noronha (administratively part of PE) 957Zone America/Noronha -2:09:40 - LMT 1914 958 -2:00 Brazil -02/-01 1990 Sep 17 959 -2:00 - -02 1999 Sep 30 960 -2:00 Brazil -02/-01 2000 Oct 15 961 -2:00 - -02 2001 Sep 13 962 -2:00 Brazil -02/-01 2002 Oct 1 963 -2:00 - -02 964# Other Atlantic islands have no permanent settlement. 965# These include Trindade and Martim Vaz (administratively part of ES), 966# Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE). 967# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; 968# it also included the Penedos. 969# 970# Amapá (AP), east Pará (PA) 971# East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu. 972# The division between east and west Pará is the river Xingu. 973# In the north a very small part from the river Javary (now Jari I guess, 974# the border with Amapá) to the Amazon, then to the Xingu. 975Zone America/Belem -3:13:56 - LMT 1914 976 -3:00 Brazil -03/-02 1988 Sep 12 977 -3:00 - -03 978# 979# west Pará (PA) 980# West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém. 981Zone America/Santarem -3:38:48 - LMT 1914 982 -4:00 Brazil -04/-03 1988 Sep 12 983 -4:00 - -04 2008 Jun 24 0:00 984 -3:00 - -03 985# 986# Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN), 987# Paraíba (PB) 988Zone America/Fortaleza -2:34:00 - LMT 1914 989 -3:00 Brazil -03/-02 1990 Sep 17 990 -3:00 - -03 1999 Sep 30 991 -3:00 Brazil -03/-02 2000 Oct 22 992 -3:00 - -03 2001 Sep 13 993 -3:00 Brazil -03/-02 2002 Oct 1 994 -3:00 - -03 995# 996# Pernambuco (PE) (except Atlantic islands) 997Zone America/Recife -2:19:36 - LMT 1914 998 -3:00 Brazil -03/-02 1990 Sep 17 999 -3:00 - -03 1999 Sep 30 1000 -3:00 Brazil -03/-02 2000 Oct 15 1001 -3:00 - -03 2001 Sep 13 1002 -3:00 Brazil -03/-02 2002 Oct 1 1003 -3:00 - -03 1004# 1005# Tocantins (TO) 1006Zone America/Araguaina -3:12:48 - LMT 1914 1007 -3:00 Brazil -03/-02 1990 Sep 17 1008 -3:00 - -03 1995 Sep 14 1009 -3:00 Brazil -03/-02 2003 Sep 24 1010 -3:00 - -03 2012 Oct 21 1011 -3:00 Brazil -03/-02 2013 Sep 1012 -3:00 - -03 1013# 1014# Alagoas (AL), Sergipe (SE) 1015Zone America/Maceio -2:22:52 - LMT 1914 1016 -3:00 Brazil -03/-02 1990 Sep 17 1017 -3:00 - -03 1995 Oct 13 1018 -3:00 Brazil -03/-02 1996 Sep 4 1019 -3:00 - -03 1999 Sep 30 1020 -3:00 Brazil -03/-02 2000 Oct 22 1021 -3:00 - -03 2001 Sep 13 1022 -3:00 Brazil -03/-02 2002 Oct 1 1023 -3:00 - -03 1024# 1025# Bahia (BA) 1026# There are too many Salvadors elsewhere, so use America/Bahia instead 1027# of America/Salvador. 1028Zone America/Bahia -2:34:04 - LMT 1914 1029 -3:00 Brazil -03/-02 2003 Sep 24 1030 -3:00 - -03 2011 Oct 16 1031 -3:00 Brazil -03/-02 2012 Oct 21 1032 -3:00 - -03 1033# 1034# Goiás (GO), Distrito Federal (DF), Minas Gerais (MG), 1035# Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR), 1036# Santa Catarina (SC), Rio Grande do Sul (RS) 1037Zone America/Sao_Paulo -3:06:28 - LMT 1914 1038 -3:00 Brazil -03/-02 1963 Oct 23 0:00 1039 -3:00 1:00 -02 1964 1040 -3:00 Brazil -03/-02 1041# 1042# Mato Grosso do Sul (MS) 1043Zone America/Campo_Grande -3:38:28 - LMT 1914 1044 -4:00 Brazil -04/-03 1045# 1046# Mato Grosso (MT) 1047Zone America/Cuiaba -3:44:20 - LMT 1914 1048 -4:00 Brazil -04/-03 2003 Sep 24 1049 -4:00 - -04 2004 Oct 1 1050 -4:00 Brazil -04/-03 1051# 1052# Rondônia (RO) 1053Zone America/Porto_Velho -4:15:36 - LMT 1914 1054 -4:00 Brazil -04/-03 1988 Sep 12 1055 -4:00 - -04 1056# 1057# Roraima (RR) 1058Zone America/Boa_Vista -4:02:40 - LMT 1914 1059 -4:00 Brazil -04/-03 1988 Sep 12 1060 -4:00 - -04 1999 Sep 30 1061 -4:00 Brazil -04/-03 2000 Oct 15 1062 -4:00 - -04 1063# 1064# east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto 1065# The great circle line from Tabatinga to Porto Acre divides 1066# east from west Amazonas. 1067Zone America/Manaus -4:00:04 - LMT 1914 1068 -4:00 Brazil -04/-03 1988 Sep 12 1069 -4:00 - -04 1993 Sep 28 1070 -4:00 Brazil -04/-03 1994 Sep 22 1071 -4:00 - -04 1072# 1073# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, 1074# Eirunepé, Envira, Ipixuna 1075Zone America/Eirunepe -4:39:28 - LMT 1914 1076 -5:00 Brazil -05/-04 1988 Sep 12 1077 -5:00 - -05 1993 Sep 28 1078 -5:00 Brazil -05/-04 1994 Sep 22 1079 -5:00 - -05 2008 Jun 24 0:00 1080 -4:00 - -04 2013 Nov 10 1081 -5:00 - -05 1082# 1083# Acre (AC) 1084Zone America/Rio_Branco -4:31:12 - LMT 1914 1085 -5:00 Brazil -05/-04 1988 Sep 12 1086 -5:00 - -05 2008 Jun 24 0:00 1087 -4:00 - -04 2013 Nov 10 1088 -5:00 - -05 1089 1090# Chile 1091 1092# From Paul Eggert (2022-03-15): 1093# Shanks & Pottenger says America/Santiago introduced standard time in 1094# 1890 and rounds its UT offset to 70W40; guess that in practice this 1095# was the same offset as in 1916-1919. It also says Pacific/Easter 1096# standardized on 109W22 in 1890; assume this didn't change the clocks. 1097# 1098# Dates for America/Santiago from 1910 to 2004 are primarily from 1099# the following source, cited by Oscar van Vlijmen (2006-10-08): 1100# [1] Chile Law 1101# http://www.webexhibits.org/daylightsaving/chile.html 1102# This contains a copy of this official table: 1103# Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30) 1104# https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm 1105# [1] needs several corrections, though. 1106# 1107# The first set of corrections is from: 1108# [2] History of the Official Time of Chile 1109# http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See: 1110# https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html 1111# This is an English translation of: 1112# Historia de la hora oficial de Chile (retrieved 2012-10-24). See: 1113# https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm 1114# A fancier Spanish version (requiring mouse-clicking) is at: 1115# http://www.horaoficial.cl/historia_hora.php 1116# Conflicts between [1] and [2] were resolved as follows: 1117# 1118# - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites 1119# Boletín No. 1, Aviso No. 1 (1910). Go with [2]. 1120# 1121# - [1] says SMT was -4:42:45, [2] says Chile's official time from 1122# 1916 to 1919 was -4:42:46.3, the meridian of Chile's National 1123# Astronomical Observatory (OAN), then located in what is now 1124# Quinta Normal in Santiago. Go with [1], as this matches the meridian 1125# referred to by the relevant Chilean laws to this day. 1126# 1127# - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites 1128# Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2]. 1129# 1130# - [1] does not give times for transitions; assume they occur 1131# at midnight mainland time, the current common practice. However, 1132# go with [2]'s specification of 23:00 for the 1947-05-21 transition. 1133# 1134# Another correction to [1] is from Jesper Nørgaard Welen, who 1135# wrote (2006-10-08), "I think that there are some obvious mistakes in 1136# the suggested link from Oscar van Vlijmen,... for instance entry 66 1137# says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at 1138# 1990-09-15 (they should have been 1990-09-15 and 1990-09-16 1139# respectively), but anyhow it clears up some doubts too." 1140# 1141# Data for Pacific/Easter from 1910 through 1967 come from Shanks & 1142# Pottenger. After that, for lack of better info assume 1143# Pacific/Easter is always two hours behind America/Santiago; 1144# this is known to work for DST transitions starting in 2008 and 1145# may well be true for earlier transitions. 1146 1147# From Tim Parenti (2022-03-15): 1148# For a brief period of roughly six weeks in 1946, DST was only observed on an 1149# emergency basis in specific regions of central Chile; namely, "the national 1150# territory between the provinces of Coquimbo and Concepción, inclusive". 1151# This was enacted by Decree 3,891, dated 1946-07-13, and took effect 1152# 1946-07-14 24:00, advancing these central regions to -03. 1153# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460715/#page/1 1154# The decree contemplated "[t]hat this advancement of the Official Time, even 1155# though it has been proposed for the cities of Santiago and Valparaíso only, 1156# must be agreed with that of other cities, due to the connection of various 1157# activities that require it, such as, for example, the operation of rail 1158# services". It was originally set to expire after 30 days but was extended 1159# through 1946-08-31 by Decree 4,506, dated 1946-08-13. 1160# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460814/#page/1 1161# 1162# Law Number 8,522, promulgated 1946-08-27, reunified Chilean clocks at their 1163# new "Summer Time" of -04, reckoned as that of "the meridian of the 1164# Astronomical Observatory of Lo Espejo, advanced by 42 minutes and 45 1165# seconds". 1166# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460828/#page/1 1167# After a brief "Winter Time" stint at -05 beginning 1947-04-01, Law Number 1168# 8,777, promulgated 1947-05-17, established year-round -04 "from 23:00 on the 1169# second day after it is published in the 'Diario Oficial'." It was published 1170# on Monday 1947-05-19 and so took effect from Wednesday 1947-05-21 23:00. 1171# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19470519/#page/1 1172 1173# From Eduardo Krell (1995-10-19): 1174# The law says to switch to DST at midnight [24:00] on the second SATURDAY 1175# of October.... The law is the same for March and October. 1176# (1998-09-29): 1177# Because of the drought this year, the government decided to go into 1178# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 1179# (unless there's another dry season next year, I guess). 1180 1181# From Julio I. Pacheco Troncoso (1999-03-18): 1182# Because of the same drought, the government decided to end DST later, 1183# on April 3, (one-time change). 1184 1185# From Germán Poo-Caamaño (2008-03-03): 1186# Due to drought, Chile extends Daylight Time in three weeks. This 1187# is one-time change (Saturday 3/29 at 24:00 for America/Santiago 1188# and Saturday 3/29 at 22:00 for Pacific/Easter) 1189# The Supreme Decree is located at 1190# http://www.shoa.cl/servicios/supremo316.pdf 1191# 1192# From José Miguel Garrido (2008-03-05): 1193# http://www.shoa.cl/noticias/2008/04hora/hora.htm 1194 1195# From Angel Chiang (2010-03-04): 1196# Subject: DST in Chile exceptionally extended to 3 April due to earthquake 1197# http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098 1198# 1199# From Arthur David Olson (2010-03-06): 1200# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch. 1201 1202# From Glenn Eychaner (2011-03-28): 1203# http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E} 1204# In English: 1205# Chile's clocks will go back an hour this year on the 7th of May instead 1206# of this Saturday. They will go forward again the 3rd Saturday in 1207# August, not in October as they have since 1968. 1208 1209# From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23): 1210# As stated in the website of the Chilean Energy Ministry 1211# http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html 1212# The Chilean Government has decided to postpone the entrance into winter time 1213# (to leave DST) from March 11 2012 to April 28th 2012.... 1214# Quote from the website communication: 1215# 1216# 6. For the year 2012, the dates of entry into winter time will be as follows: 1217# a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at 1218# 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00 1219# of the same day. 1220# b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is, 1221# at 23:59:59, instead of passing to 0:00, the time should be adjusted to be 1222# 01:00 on September 2. 1223 1224# From Steffen Thorsen (2013-02-15): 1225# According to several news sources, Chile has extended DST this year, 1226# they will end DST later and start DST earlier than planned. They 1227# hope to save energy. The new end date is 2013-04-28 00:00 and new 1228# start date is 2013-09-08 00:00.... 1229# http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm 1230 1231# From José Miguel Garrido (2014-02-19): 1232# Today appeared in the Diario Oficial a decree amending the time change 1233# dates to 2014. 1234# DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC) 1235# DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC) 1236# http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf 1237 1238# From Eduardo Romero Urra (2015-03-03): 1239# Today has been published officially that Chile will use the DST time 1240# permanently until March 25 of 2017 1241# http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg 1242# 1243# From Paul Eggert (2015-03-03): 1244# For now, assume that the extension will persist indefinitely. 1245 1246# From Juan Correa (2016-03-18): 1247# The decree regarding DST has been published in today's Official Gazette: 1248# http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/ 1249# http://www.leychile.cl/Navegar?idNorma=1088502 1250# It does consider the second Saturday of May and August as the dates 1251# for the transition; and it lists DST dates until 2019, but I think 1252# this scheme will stick. 1253# 1254# From Paul Eggert (2016-03-18): 1255# For now, assume the pattern holds for the indefinite future. 1256# The decree says transitions occur at 24:00; in practice this appears 1257# to mean 24:00 mainland time, not 24:00 local time, so that Easter 1258# Island is always two hours behind the mainland. 1259 1260# From Juan Correa (2016-12-04): 1261# Magallanes region ... will keep DST (UTC -3) all year round.... 1262# 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 1263# From Deborah Goldsmith (2017-01-19): 1264# http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf 1265 1266# From Juan Correa (2018-08-13): 1267# As of moments ago, the Ministry of Energy in Chile has announced the new 1268# schema for DST. ... Announcement in video (in Spanish): 1269# https://twitter.com/MinEnergia/status/1029000399129374720 1270# From Yonathan Dossow (2018-08-13): 1271# The video says "first Saturday of September", we all know it means Sunday at 1272# midnight. 1273# From Tim Parenti (2018-08-13): 1274# Translating the captions on the video at 0:44-0:55, "We want to announce as 1275# Government that from 2019, Winter Time will be increased to 5 months, between 1276# the first Saturday of April and the first Saturday of September." 1277# At 2:08-2:20, "The Magallanes region will maintain its current time, as 1278# decided by the citizens during 2017, but our Government will promote a 1279# regional dialogue table to gather their opinion on this matter." 1280# https://twitter.com/MinEnergia/status/1029009354001973248 1281# "We will keep the new time policy unchanged for at least the next 4 years." 1282# So we extend the new rules on Saturdays at 24:00 mainland time indefinitely. 1283# From Juan Correa (2019-02-04): 1284# http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/1498738.pdf 1285# From Paul Eggert (2019-09-01): 1286# The above says the Magallanes exception expires 2022-04-02 at 24:00, 1287# so in theory, they will revert to -04/-03 after that. 1288# For now, assume that they will not revert, 1289# since they have extended the expiration date once already. 1290 1291# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1292Rule Chile 1927 1931 - Sep 1 0:00 1:00 - 1293Rule Chile 1928 1932 - Apr 1 0:00 0 - 1294Rule Chile 1968 only - Nov 3 4:00u 1:00 - 1295Rule Chile 1969 only - Mar 30 3:00u 0 - 1296Rule Chile 1969 only - Nov 23 4:00u 1:00 - 1297Rule Chile 1970 only - Mar 29 3:00u 0 - 1298Rule Chile 1971 only - Mar 14 3:00u 0 - 1299Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 - 1300Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - 1301Rule Chile 1973 only - Sep 30 4:00u 1:00 - 1302Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 - 1303Rule Chile 1987 only - Apr 12 3:00u 0 - 1304Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 - 1305Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 - 1306Rule Chile 1990 only - Sep 16 4:00u 1:00 - 1307Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - 1308Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 - 1309Rule Chile 1997 only - Mar 30 3:00u 0 - 1310Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - 1311Rule Chile 1998 only - Sep 27 4:00u 1:00 - 1312Rule Chile 1999 only - Apr 4 3:00u 0 - 1313Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 - 1314Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 - 1315# N.B.: the end of March 29 in Chile is March 30 in Universal time, 1316# which is used below in specifying the transition. 1317Rule Chile 2008 only - Mar 30 3:00u 0 - 1318Rule Chile 2009 only - Mar Sun>=9 3:00u 0 - 1319Rule Chile 2010 only - Apr Sun>=1 3:00u 0 - 1320Rule Chile 2011 only - May Sun>=2 3:00u 0 - 1321Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 - 1322Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 - 1323Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 - 1324Rule Chile 2016 2018 - May Sun>=9 3:00u 0 - 1325Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 - 1326Rule Chile 2019 max - Apr Sun>=2 3:00u 0 - 1327Rule Chile 2019 max - Sep Sun>=2 4:00u 1:00 - 1328# IATA SSIM anomalies: (1992-02) says 1992-03-14; 1329# (1996-09) says 1998-03-08. Ignore these. 1330# Zone NAME STDOFF RULES FORMAT [UNTIL] 1331Zone America/Santiago -4:42:45 - LMT 1890 1332 -4:42:45 - SMT 1910 Jan 10 # Santiago Mean Time 1333 -5:00 - -05 1916 Jul 1 1334 -4:42:45 - SMT 1918 Sep 10 1335 -4:00 - -04 1919 Jul 1 1336 -4:42:45 - SMT 1927 Sep 1 1337 -5:00 Chile -05/-04 1932 Sep 1 1338 -4:00 - -04 1942 Jun 1 1339 -5:00 - -05 1942 Aug 1 1340 -4:00 - -04 1946 Jul 15 1341 -4:00 1:00 -03 1946 Sep 1 # central Chile 1342 -4:00 - -04 1947 Apr 1 1343 -5:00 - -05 1947 May 21 23:00 1344 -4:00 Chile -04/-03 1345Zone America/Punta_Arenas -4:43:40 - LMT 1890 1346 -4:42:45 - SMT 1910 Jan 10 1347 -5:00 - -05 1916 Jul 1 1348 -4:42:45 - SMT 1918 Sep 10 1349 -4:00 - -04 1919 Jul 1 1350 -4:42:45 - SMT 1927 Sep 1 1351 -5:00 Chile -05/-04 1932 Sep 1 1352 -4:00 - -04 1942 Jun 1 1353 -5:00 - -05 1942 Aug 1 1354 -4:00 - -04 1947 Apr 1 1355 -5:00 - -05 1947 May 21 23:00 1356 -4:00 Chile -04/-03 2016 Dec 4 1357 -3:00 - -03 1358Zone Pacific/Easter -7:17:28 - LMT 1890 1359 -7:17:28 - EMT 1932 Sep # Easter Mean Time 1360 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time 1361 -6:00 Chile -06/-05 1362# 1363# Salas y Gómez Island is uninhabited. 1364# Other Chilean locations, including Juan Fernández Is, Desventuradas Is, 1365# and Antarctic bases, are like America/Santiago. 1366 1367# Antarctic base using South American rules 1368# (See the file 'antarctica' for more.) 1369# 1370# Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) 1371# 1372# From Ethan Dicks (1996-10-06): 1373# It keeps the same time as Punta Arenas, Chile, because, just like us 1374# and the South Pole, that's the other end of their supply line.... 1375# I verified with someone who was there that since 1980, 1376# Palmer has followed Chile. Prior to that, before the Falklands War, 1377# Palmer used to be supplied from Argentina. 1378# 1379# Zone NAME STDOFF RULES FORMAT [UNTIL] 1380Zone Antarctica/Palmer 0 - -00 1965 1381 -4:00 Arg -04/-03 1969 Oct 5 1382 -3:00 Arg -03/-02 1982 May 1383 -4:00 Chile -04/-03 2016 Dec 4 1384 -3:00 - -03 1385 1386# Colombia 1387 1388# Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes, 1389# "A variation of fifteen minutes in the public clocks of Bogota is not rare." 1390 1391# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1392Rule CO 1992 only - May 3 0:00 1:00 - 1393Rule CO 1993 only - Apr 4 0:00 0 - 1394# Zone NAME STDOFF RULES FORMAT [UNTIL] 1395Zone America/Bogota -4:56:16 - LMT 1884 Mar 13 1396 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time 1397 -5:00 CO -05/-04 1398# Malpelo, Providencia, San Andres 1399# no information; probably like America/Bogota 1400 1401# Curaçao 1402# Zone NAME STDOFF RULES FORMAT [UNTIL] 1403Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad 1404 -4:30 - -0430 1965 1405 -4:00 - AST 1406 1407Link America/Curacao America/Kralendijk 1408Link America/Curacao America/Lower_Princes 1409# 1410# From Arthur David Olson (2011-06-15): 1411# use links for places with new iso3166 codes. 1412# The name "Lower Prince's Quarter" is both longer than fourteen characters 1413# and contains an apostrophe; use "Lower_Princes".... 1414# From Paul Eggert (2021-09-29): 1415# These backward-compatibility links now are in the 'northamerica' file. 1416 1417# Ecuador 1418# 1419# Milne says the Central and South American Telegraph Company used -5:24:15. 1420# 1421# From Alois Treindl (2016-12-15): 1422# https://www.elcomercio.com/actualidad/hora-sixto-1993.html 1423# ... Whether the law applied also to Galápagos, I do not know. 1424# From Paul Eggert (2016-12-15): 1425# https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html 1426# This says President Sixto Durán Ballén signed decree No. 285, which 1427# established DST from 1992-11-28 to 1993-02-05; it does not give transition 1428# times. The people called it "hora de Sixto" ("Sixto hour"). The change did 1429# not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics 1430# that included "Amanecía en mitad de la noche, los guaguas iban a clase sin 1431# sol" ("It was dawning in the middle of the night, the buses went to class 1432# without sun"). Although Ballén's campaign slogan was "Ni un paso atrás" 1433# (Not one step back), the clocks went back in 1993 and the experiment was not 1434# repeated. For now, assume transitions were at 00:00 local time country-wide. 1435# 1436# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1437Rule Ecuador 1992 only - Nov 28 0:00 1:00 - 1438Rule Ecuador 1993 only - Feb 5 0:00 0 - 1439# 1440# Zone NAME STDOFF RULES FORMAT [UNTIL] 1441Zone America/Guayaquil -5:19:20 - LMT 1890 1442 -5:14:00 - QMT 1931 # Quito Mean Time 1443 -5:00 Ecuador -05/-04 1444Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 1445 -5:00 - -05 1986 1446 -6:00 Ecuador -06/-05 1447 1448# Falklands 1449 1450# From Paul Eggert (2006-03-22): 1451# Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except 1452# the IATA gives 1996-09-08. Go with Shanks & Pottenger. 1453 1454# From Falkland Islands Government Office, London (2001-01-22) 1455# via Jesper Nørgaard: 1456# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15 1457# April 2001 and advance one hour to summer time at 2 am on Sunday 2 1458# September. It is anticipated that the clocks will revert back at 2 1459# am on Sunday 21 April 2002 and advance to summer time at 2 am on 1460# Sunday 1 September. 1461 1462# From Rives McDow (2001-02-13): 1463# 1464# I have communicated several times with people there, and the last 1465# time I had communications that was helpful was in 1998. Here is 1466# what was said then: 1467# 1468# "The general rule was that Stanley used daylight saving and the Camp 1469# did not. However for various reasons many people in the Camp have 1470# started to use daylight saving (known locally as 'Stanley Time') 1471# There is no rule as to who uses daylight saving - it is a matter of 1472# personal choice and so it is impossible to draw a map showing who 1473# uses it and who does not. Any list would be out of date as soon as 1474# it was produced. This year daylight saving ended on April 18/19th 1475# and started again on September 12/13th. I do not know what the rule 1476# is, but can find out if you like. We do not change at the same time 1477# as UK or Chile." 1478# 1479# I did have in my notes that the rule was "Second Saturday in Sep at 1480# 0:00 until third Saturday in Apr at 0:00". I think that this does 1481# not agree in some cases with Shanks; is this true? 1482# 1483# Also, there is no mention in the list that some areas in the 1484# Falklands do not use DST. I have found in my communications there 1485# that these areas are on the western half of East Falkland and all of 1486# West Falkland. Stanley is the only place that consistently observes 1487# DST. Again, as in other places in the world, the farmers don't like 1488# it. West Falkland is almost entirely sheep farmers. 1489# 1490# I know one lady there that keeps a list of which farm keeps DST and 1491# which doesn't each year. She runs a shop in Stanley, and says that 1492# the list changes each year. She uses it to communicate to her 1493# customers, catching them when they are home for lunch or dinner. 1494 1495# From Paul Eggert (2001-03-05): 1496# For now, we'll just record the time in Stanley, since we have no 1497# better info. 1498 1499# From Steffen Thorsen (2011-04-01): 1500# The Falkland Islands will not turn back clocks this winter, but stay on 1501# daylight saving time. 1502# 1503# One source: 1504# http://www.falklandnews.com/public/story.cfm?get=5914&source=3 1505# 1506# We have gotten this confirmed by a clerk of the legislative assembly: 1507# Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the 1508# third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3 1509# hours) on the first Sunday of September at 0200hrs. 1510# 1511# IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands 1512# will not revert to local mean time, but clocks will remain on Summer 1513# time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term 1514# change to local time following the trial period will be notified. 1515# 1516# From Andrew Newman (2012-02-24) 1517# A letter from Justin McPhee, Chief Executive, 1518# Cable & Wireless Falkland Islands (dated 2012-02-22) 1519# states... 1520# The current Atlantic/Stanley entry under South America expects the 1521# clocks to go back to standard Falklands Time (FKT) on the 15th April. 1522# The database entry states that in 2011 Stanley was staying on fixed 1523# summer time on a trial basis only. FIG need to contact IANA and/or 1524# the maintainers of the database to inform them we're adopting 1525# the same policy this year and suggest recommendations for future years. 1526# 1527# For now we will assume permanent -03 for the Falklands 1528# until advised differently (to apply for 2012 and beyond, after the 2011 1529# experiment was apparently successful.) 1530# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1531Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 - 1532Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 1533Rule Falk 1939 only - Oct 1 0:00 1:00 - 1534Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 - 1535Rule Falk 1943 only - Jan 1 0:00 0 - 1536Rule Falk 1983 only - Sep lastSun 0:00 1:00 - 1537Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 1538Rule Falk 1984 only - Sep 16 0:00 1:00 - 1539Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 - 1540Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 - 1541Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 - 1542Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 - 1543# Zone NAME STDOFF RULES FORMAT [UNTIL] 1544Zone Atlantic/Stanley -3:51:24 - LMT 1890 1545 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 1546 -4:00 Falk -04/-03 1983 May 1547 -3:00 Falk -03/-02 1985 Sep 15 1548 -4:00 Falk -04/-03 2010 Sep 5 2:00 1549 -3:00 - -03 1550 1551# French Guiana 1552# Zone NAME STDOFF RULES FORMAT [UNTIL] 1553Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1554 -4:00 - -04 1967 Oct 1555 -3:00 - -03 1556 1557# Guyana 1558 1559# From P Chan (2020-11-27): 1560# https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547 1561# The Official Gazette of British Guiana. (New Series.) Vol. XL. July to 1562# December, 1915, p 1547, lists as several notes: 1563# "Local Mean Time 3 hours 52 mins. 39 secs. slow of Greenwich Mean Time 1564# (Georgetown.) From 1st August, 1911, British Guiana Standard Mean Time 4 1565# hours slow of Greenwich Mean Time, by notice in Official Gazette on 1st July, 1566# 1911. From 1st March, 1915, British Guiana Standard Mean Time 3 hours 45 1567# mins. 0 secs. slow of Greenwich Mean Time, by notice in Official Gazette on 1568# 23rd January, 1915." 1569# 1570# https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpretation_and_general_clauses_(amendment)_act_1975.pdf 1571# Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975) 1572# [dated 1975-07-31] 1573# "This Act...shall come into operation on 1st August, 1975." 1574# "...where any expression of time occurs...the time referred to shall signify 1575# the standard time of Guyana which shall be three hours behind Greenwich Mean 1576# Time." 1577# 1578# Circular No. 10/1992 dated 1992-03-20 1579# https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf 1580# "...cabinet has decided that with effect from Sunday 29th March, 1992, Guyana 1581# Standard Time would be re-established at 01:00 hours by adjusting the hands 1582# of the clock back to 24:00 hours." 1583# Legislated in the Interpretation and general clauses (Amendment) Act 1992 1584# (Act No. 6 of 1992) [passed 1992-03-27, published 1992-04-18] 1585# https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_general_clauses_(amendment)_act_1992.pdf 1586 1587# Zone NAME STDOFF RULES FORMAT [UNTIL] 1588Zone America/Guyana -3:52:39 - LMT 1911 Aug 1 # Georgetown 1589 -4:00 - -04 1915 Mar 1 1590 -3:45 - -0345 1975 Aug 1 1591 -3:00 - -03 1992 Mar 29 1:00 1592 -4:00 - -04 1593 1594# Paraguay 1595# 1596# From Paul Eggert (2006-03-22): 1597# Shanks & Pottenger say that spring transitions are 01:00 -> 02:00, 1598# and autumn transitions are 00:00 -> 23:00. Go with pre-1999 1599# editions of Shanks, and with the IATA, who say transitions occur at 00:00. 1600# 1601# From Waldemar Villamayor-Venialbo (2013-09-20): 1602# No time of the day is established for the adjustment, so people normally 1603# adjust their clocks at 0 hour of the given dates. 1604# 1605# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1606Rule Para 1975 1988 - Oct 1 0:00 1:00 - 1607Rule Para 1975 1978 - Mar 1 0:00 0 - 1608Rule Para 1979 1991 - Apr 1 0:00 0 - 1609Rule Para 1989 only - Oct 22 0:00 1:00 - 1610Rule Para 1990 only - Oct 1 0:00 1:00 - 1611Rule Para 1991 only - Oct 6 0:00 1:00 - 1612Rule Para 1992 only - Mar 1 0:00 0 - 1613Rule Para 1992 only - Oct 5 0:00 1:00 - 1614Rule Para 1993 only - Mar 31 0:00 0 - 1615Rule Para 1993 1995 - Oct 1 0:00 1:00 - 1616Rule Para 1994 1995 - Feb lastSun 0:00 0 - 1617Rule Para 1996 only - Mar 1 0:00 0 - 1618# IATA SSIM (2000-02) says 1999-10-10; ignore this for now. 1619# From Steffen Thorsen (2000-10-02): 1620# I have three independent reports that Paraguay changed to DST this Sunday 1621# (10-01). 1622# 1623# Translated by Gwillim Law (2001-02-27) from 1624# Noticias, a daily paper in Asunción, Paraguay (2000-10-01): 1625# http://www.diarionoticias.com.py/011000/nacional/naciona1.htm 1626# Starting at 0:00 today, the clock will be set forward 60 minutes, in 1627# fulfillment of Decree No. 7,273 of the Executive Power.... The time change 1628# system has been operating for several years. Formerly there was a separate 1629# decree each year; the new law has the same effect, but permanently. Every 1630# year, the time will change on the first Sunday of October; likewise, the 1631# clock will be set back on the first Sunday of March. 1632# 1633Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 - 1634# IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger. 1635Rule Para 1997 only - Feb lastSun 0:00 0 - 1636# Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but 1637# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27). 1638Rule Para 1998 2001 - Mar Sun>=1 0:00 0 - 1639# From Rives McDow (2002-02-28): 1640# A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the 1641# dst method to be from the first Sunday in September to the first Sunday in 1642# April. 1643Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - 1644Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 - 1645# 1646# From Jesper Nørgaard Welen (2005-01-02): 1647# There are several sources that claim that Paraguay made 1648# a timezone rule change in autumn 2004. 1649# From Steffen Thorsen (2005-01-05): 1650# Decree 1,867 (2004-03-05) 1651# From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13) 1652# http://www.presidencia.gov.py/decretos/D1867.pdf 1653Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 - 1654Rule Para 2005 2009 - Mar Sun>=8 0:00 0 - 1655# From Carlos Raúl Perasso (2010-02-18): 1656# By decree number 3958 issued yesterday 1657# http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf 1658# Paraguay changes its DST schedule, postponing the March rule to April and 1659# modifying the October date. The decree reads: 1660# ... 1661# Art. 1. It is hereby established that from the second Sunday of the month of 1662# April of this year (2010), the official time is to be set back 60 minutes, 1663# and that on the first Sunday of the month of October, it is to be set 1664# forward 60 minutes, in all the territory of the Paraguayan Republic. 1665# ... 1666Rule Para 2010 max - Oct Sun>=1 0:00 1:00 - 1667Rule Para 2010 2012 - Apr Sun>=8 0:00 0 - 1668# 1669# From Steffen Thorsen (2013-03-07): 1670# Paraguay will end DST on 2013-03-24 00:00.... 1671# http://www.ande.gov.py/interna.php?id=1075 1672# 1673# From Carlos Raúl Perasso (2013-03-15): 1674# The change in Paraguay is now final. Decree number 10780 1675# http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf 1676# From Carlos Raúl Perasso (2014-02-28): 1677# Decree 1264 can be found at: 1678# http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf 1679Rule Para 2013 max - Mar Sun>=22 0:00 0 - 1680 1681# Zone NAME STDOFF RULES FORMAT [UNTIL] 1682Zone America/Asuncion -3:50:40 - LMT 1890 1683 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time 1684 -4:00 - -04 1972 Oct 1685 -3:00 - -03 1974 Apr 1686 -4:00 Para -04/-03 1687 1688# Peru 1689# 1690# From Evelyn C. Leeper via Mark Brader (2003-10-26) 1691# <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>: 1692# When we were in Peru in 1985-1986, they apparently switched over 1693# sometime between December 29 and January 3 while we were on the Amazon. 1694# 1695# From Paul Eggert (2006-03-22): 1696# Shanks & Pottenger don't have this transition. Assume 1986 was like 1987. 1697 1698# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1699Rule Peru 1938 only - Jan 1 0:00 1:00 - 1700Rule Peru 1938 only - Apr 1 0:00 0 - 1701Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 - 1702Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 1703Rule Peru 1986 1987 - Jan 1 0:00 1:00 - 1704Rule Peru 1986 1987 - Apr 1 0:00 0 - 1705Rule Peru 1990 only - Jan 1 0:00 1:00 - 1706Rule Peru 1990 only - Apr 1 0:00 0 - 1707# IATA is ambiguous for 1993/1995; go with Shanks & Pottenger. 1708Rule Peru 1994 only - Jan 1 0:00 1:00 - 1709Rule Peru 1994 only - Apr 1 0:00 0 - 1710# Zone NAME STDOFF RULES FORMAT [UNTIL] 1711Zone America/Lima -5:08:12 - LMT 1890 1712 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time? 1713 -5:00 Peru -05/-04 1714 1715# South Georgia 1716# Zone NAME STDOFF RULES FORMAT [UNTIL] 1717Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 1718 -2:00 - -02 1719 1720# South Sandwich Is 1721# uninhabited; scientific personnel have wintered 1722 1723# Suriname 1724# Zone NAME STDOFF RULES FORMAT [UNTIL] 1725Zone America/Paramaribo -3:40:40 - LMT 1911 1726 -3:40:52 - PMT 1935 # Paramaribo Mean Time 1727 -3:40:36 - PMT 1945 Oct # The capital moved? 1728 -3:30 - -0330 1984 Oct 1729 -3:00 - -03 1730 1731# Trinidad and Tobago 1732# Zone NAME STDOFF RULES FORMAT [UNTIL] 1733Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 1734 -4:00 - AST 1735 1736Link America/Port_of_Spain America/Marigot 1737Link America/Port_of_Spain America/St_Barthelemy 1738# Uruguay 1739# From Paul Eggert (1993-11-18): 1740# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 1741# 1742# From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael 1743# Deckers (2018-02-20): 1744# ... At least they kept good records... 1745# 1746# http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36 1747# Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and 1748# Meteorology Service of the Uruguayan Navy, seems to give many transitions 1749# with greater clarity than we've had before. It directly references many laws 1750# and decrees which are, in turn, referenced below. They can be viewed in the 1751# public archives of the Diario Oficial (in Spanish) at 1752# http://www.impo.com.uy/diariooficial/ 1753# 1754# Ley No. 3920 of 1908-06-10 placed the determination of legal time under the 1755# auspices of the National Institute for the Prediction of Time. It is unclear 1756# exactly what offset was used during this period, though Ley No. 7200 of 1757# 1920-04-23 used the Observatory of the National Meteorological Institute in 1758# Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian, 1759# retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00, 1760# resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on 1761# page 725 of the Proceedings of the Second Pan-American Scientific Congress, 1762# 1915-1916) was in use, and merely became official from 1908-06-10. 1763# https://www.impo.com.uy/diariooficial/1908/06/18/12 1764# https://www.impo.com.uy/diariooficial/1920/04/27/9 1765# 1766# Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced 1767# by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14 1768# minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the 1769# National Council of Administration the same day, published directly below the 1770# law in the Diario Oficial, specified the first transition to be 1923-09-30 1771# 24:00. This effectively established standard time at UT-03:30 with 30 1772# minutes DST. Assume transitions at 24:00 on the specified days until Ley No. 1773# 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other 1774# provisions which oppose" it, resulting in year-round UT-03:30; a Resolución 1775# of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it 1776# would have been under the previous law. 1777# https://www.impo.com.uy/diariooficial/1923/07/02/2 1778# https://www.impo.com.uy/diariooficial/1926/03/10/2 1779# https://www.impo.com.uy/diariooficial/1926/03/18/2 1780# 1781# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1782Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 - 1783Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 1784# From Tim Parenti (2018-02-15): 1785# http://www.impo.com.uy/diariooficial/1933/10/27/6 1786# 1787# It appears Ley No. 9122 of 1933 was never published as such in the Diario 1788# Oficial, but instead appeared as Document 26 in the Diario on Friday 1789# 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of 1790# National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the 1791# last Sunday of October...until the last Saturday of March." In accordance 1792# with this provision, the first transition was explicitly specified in Article 1793# 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29 1794# at 00:00. Assume transitions at 00:00 Sunday throughout. 1795# 1796# Departing from the matter-of-fact nature of previous timekeeping laws, the 1797# 1933 decree "consider[s] the advantages of...the advance of legal time": 1798# 1799# "Whereas: The measure adopted by almost all nations at the time of the last 1800# World War still persists in North America and Europe, precisely because of 1801# the economic, hygienic, and social advantages derived from such an 1802# emergency measure... 1803# 1804# Whereas: The advance of the legal time during the summer seasons, by 1805# displacing social activity near sunrise, favors the citizen populations 1806# and especially the society that creates and works..." 1807# 1808# It further specified that "necessary measures" be taken to ensure that 1809# "public spectacles finish, in general, before [01:00]." 1810Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 - 1811Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 - 1812# From Tim Parenti (2018-02-15): 1813# Most of the Rules below, and their contemporaneous Zone lines, have been 1814# updated simply to match the Almanaque 2018. Although the document does not 1815# list exact transition times, midnight transitions were already present in our 1816# data here for all transitions through 2004-09, and this is both consistent 1817# with prior transitions and verified in several decrees marked below between 1818# 1939-09 and 2004-09, wherein the relevant text was typically of the form: 1819# 1820# "From 0 hours on [date], the legal time of the entire Republic will be... 1821# 1822# In accordance with [the preceding], on [previous date] at 24 hours, all 1823# clocks throughout the Republic will be [advanced/retarded] by..." 1824# 1825# It is possible that there is greater specificity to be found for the Rules 1826# below, but it is buried in no fewer than 40 different decrees individually 1827# referenced by the Almanaque for the period from 1939-09 to 2014-09. 1828# Four-fifths of these were promulgated less than two weeks before taking 1829# effect; more than half within a week and none more than 5 weeks. Only the 1830# handful with comments below have been checked with any thoroughness. 1831Rule Uruguay 1939 only - Oct 1 0:00 0:30 - 1832Rule Uruguay 1940 only - Oct 27 0:00 0:30 - 1833# From Tim Parenti (2018-02-15): 1834# Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified 1835# UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel". 1836# http://www.impo.com.uy/diariooficial/1941/08/04/1 1837Rule Uruguay 1941 only - Aug 1 0:00 0:30 - 1838# From Tim Parenti (2018-02-15): 1839# Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified 1840# further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks 1841# never went back to UT-03:30 thereafter, this is modeled as advancing standard 1842# time by 30 minutes to UT-03, while retaining 30 minutes of DST. 1843# http://www.impo.com.uy/diariooficial/1942/12/16/3 1844Rule Uruguay 1942 only - Dec 14 0:00 0:30 - 1845Rule Uruguay 1943 only - Mar 14 0:00 0 - 1846Rule Uruguay 1959 only - May 24 0:00 0:30 - 1847Rule Uruguay 1959 only - Nov 15 0:00 0 - 1848Rule Uruguay 1960 only - Jan 17 0:00 1:00 - 1849Rule Uruguay 1960 only - Mar 6 0:00 0 - 1850Rule Uruguay 1965 only - Apr 4 0:00 1:00 - 1851Rule Uruguay 1965 only - Sep 26 0:00 0 - 1852# From Tim Parenti (2018-02-15): 1853# Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the 1854# day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00. 1855# http://www.impo.com.uy/diariooficial/1968/05/30/5 1856Rule Uruguay 1968 only - May 27 0:00 0:30 - 1857Rule Uruguay 1968 only - Dec 1 0:00 0 - 1858# From Tim Parenti (2018-02-15): 1859# Decreto 188/970 of 1970-04-23 instituted restrictions on electricity 1860# consumption "as a consequence of the current rainfall regime in the country". 1861# Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00. 1862# http://www.impo.com.uy/diariooficial/1970/04/29/4 1863Rule Uruguay 1970 only - Apr 25 0:00 1:00 - 1864Rule Uruguay 1970 only - Jun 14 0:00 0 - 1865Rule Uruguay 1972 only - Apr 23 0:00 1:00 - 1866Rule Uruguay 1972 only - Jul 16 0:00 0 - 1867# From Tim Parenti (2018-02-15): 1868# Decreto 29/974 of 1974-01-11, citing "the international rise in the price of 1869# oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of 1870# 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30 1871# minutes followed in Decreto 679/974 of 1974-08-29. 1872# http://www.impo.com.uy/diariooficial/1974/01/22/11 1873# http://www.impo.com.uy/diariooficial/1974/03/14/3 1874# http://www.impo.com.uy/diariooficial/1974/09/04/6 1875Rule Uruguay 1974 only - Jan 13 0:00 1:30 - 1876Rule Uruguay 1974 only - Mar 10 0:00 0:30 - 1877Rule Uruguay 1974 only - Sep 1 0:00 0 - 1878Rule Uruguay 1974 only - Dec 22 0:00 1:00 - 1879Rule Uruguay 1975 only - Mar 30 0:00 0 - 1880Rule Uruguay 1976 only - Dec 19 0:00 1:00 - 1881Rule Uruguay 1977 only - Mar 6 0:00 0 - 1882Rule Uruguay 1977 only - Dec 4 0:00 1:00 - 1883Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 - 1884Rule Uruguay 1978 only - Dec 17 0:00 1:00 - 1885Rule Uruguay 1979 only - Apr 29 0:00 1:00 - 1886Rule Uruguay 1980 only - Mar 16 0:00 0 - 1887# From Tim Parenti (2018-02-15): 1888# Decreto 725/987 of 1987-12-04 cited "better use of national tourist 1889# attractions" to advance clocks one hour from Monday 1987-12-14 00:00. 1890# http://www.impo.com.uy/diariooficial/1988/01/25/1 1891Rule Uruguay 1987 only - Dec 14 0:00 1:00 - 1892Rule Uruguay 1988 only - Feb 28 0:00 0 - 1893Rule Uruguay 1988 only - Dec 11 0:00 1:00 - 1894Rule Uruguay 1989 only - Mar 5 0:00 0 - 1895Rule Uruguay 1989 only - Oct 29 0:00 1:00 - 1896Rule Uruguay 1990 only - Feb 25 0:00 0 - 1897# From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04): 1898# IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the 1899# 1992/1993 season appears to be the first in over half a century where DST 1900# both began and ended pursuant to the same decree. 1901Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 - 1902Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 - 1903Rule Uruguay 1992 only - Oct 18 0:00 1:00 - 1904Rule Uruguay 1993 only - Feb 28 0:00 0 - 1905# From Eduardo Cota (2004-09-20): 1906# The Uruguayan government has decreed a change in the local time.... 1907# From Tim Parenti (2018-02-15): 1908# Decreto 328/004 of 2004-09-15. 1909# http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1 1910Rule Uruguay 2004 only - Sep 19 0:00 1:00 - 1911# From Steffen Thorsen (2005-03-11): 1912# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to 1913# save energy ... it was postponed two weeks.... 1914# From Tim Parenti (2018-02-15): 1915# This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous 1916# reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending 1917# Decreto 328/004: 1918# http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1 1919# The original decree specified a transition of 2005-03-12 24:00, but the new 1920# one specified 2005-03-27 02:00. 1921Rule Uruguay 2005 only - Mar 27 2:00 0 - 1922# From Eduardo Cota (2005-09-27): 1923# ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time, 1924# official time in Uruguay will be at GMT -2. 1925# From Tim Parenti (2018-02-15): 1926# Decreto 318/005 of 2005-09-19. 1927# http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1 1928Rule Uruguay 2005 only - Oct 9 2:00 1:00 - 1929Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 - 1930# From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06): 1931# Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday 1932# of October at 02:00 through the second Sunday of March at 02:00. Almanaque 1933# 2018 appears to have a few typoed dates through this period; ignore them. 1934# http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1 1935Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - 1936# From Steffen Thorsen (2015-06-30): 1937# ... it looks like they will not be using DST the coming summer: 1938# http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 1939# http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/ 1940# From Paul Eggert (2015-06-30): 1941# Apparently restaurateurs complained that DST caused people to go to the beach 1942# instead of out to dinner. 1943# From Pablo Camargo (2015-07-13): 1944# http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf 1945# From Tim Parenti (2018-02-15): 1946# Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. 1947 1948# This Zone can be simplified once we assume zic %z. 1949Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10 1950 -3:44:51 - MMT 1920 May 1 # Montevideo MT 1951 -4:00 - -04 1923 Oct 1 1952 -3:30 Uruguay -0330/-03 1942 Dec 14 1953 -3:00 Uruguay -03/-0230 1960 1954 -3:00 Uruguay -03/-02 1968 1955 -3:00 Uruguay -03/-0230 1970 1956 -3:00 Uruguay -03/-02 1974 1957 -3:00 Uruguay -03/-0130 1974 Mar 10 1958 -3:00 Uruguay -03/-0230 1974 Dec 22 1959 -3:00 Uruguay -03/-02 1960 1961# Venezuela 1962# 1963# From Paul Eggert (2015-07-28): 1964# For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533 1965# http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf 1966# 1967# From John Stainforth (2007-11-28): 1968# ... the change for Venezuela originally expected for 2007-12-31 has 1969# been brought forward to 2007-12-09. The official announcement was 1970# published today in the "Gaceta Oficial de la República Bolivariana 1971# de Venezuela, número 38.819" (official document for all laws or 1972# resolution publication) 1973# http://www.globovision.com/news.php?nid=72208 1974 1975# From Alexander Krivenyshev (2016-04-15): 1976# https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino 1977# 1978# From Paul Eggert (2016-04-15): 1979# Clocks advance 30 minutes on 2016-05-01 at 02:30.... 1980# "'Venezuela's new time-zone: hours without light, hours without water, 1981# hours of presidential broadcasts, hours of lines,' quipped comedian 1982# Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps 1983# half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400 1984# https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE 1985# 1986# From Matt Johnson (2016-04-20): 1987# ... published in the official Gazette [2016-04-18], here: 1988# http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf 1989 1990# Zone NAME STDOFF RULES FORMAT [UNTIL] 1991Zone America/Caracas -4:27:44 - LMT 1890 1992 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? 1993 -4:30 - -0430 1965 Jan 1 0:00 1994 -4:00 - -04 2007 Dec 9 3:00 1995 -4:30 - -0430 2016 May 1 2:30 1996 -4:00 - -04 1997
