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 #STDOFF -4:16:48.25 404 -4:16:48 - CMT 1920 May # Córdoba Mean Time 405 -4:00 - -04 1930 Dec 406 -4:00 Arg -04/-03 1969 Oct 5 407 -3:00 Arg -03/-02 1999 Oct 3 408 -4:00 Arg -04/-03 2000 Mar 3 409 -3:00 Arg -03/-02 410# 411# Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN), 412# Chaco (CC), Formosa (FM), Santiago del Estero (SE) 413# 414# Shanks & Pottenger also make the following claims, which we haven't verified: 415# - Formosa switched to -3:00 on 1991-01-07. 416# - Misiones switched to -3:00 on 1990-12-29. 417# - Chaco switched to -3:00 on 1991-01-04. 418# - Santiago del Estero switched to -4:00 on 1991-04-01, 419# then to -3:00 on 1991-04-26. 420# 421 #STDOFF -4:16:48.25 422Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31 423 -4:16:48 - CMT 1920 May 424 -4:00 - -04 1930 Dec 425 -4:00 Arg -04/-03 1969 Oct 5 426 -3:00 Arg -03/-02 1991 Mar 3 427 -4:00 - -04 1991 Oct 20 428 -3:00 Arg -03/-02 1999 Oct 3 429 -4:00 Arg -04/-03 2000 Mar 3 430 -3:00 Arg -03/-02 431# 432# Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN) 433Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31 434 #STDOFF -4:16:48.25 435 -4:16:48 - CMT 1920 May 436 -4:00 - -04 1930 Dec 437 -4:00 Arg -04/-03 1969 Oct 5 438 -3:00 Arg -03/-02 1991 Mar 3 439 -4:00 - -04 1991 Oct 20 440 -3:00 Arg -03/-02 1999 Oct 3 441 -4:00 Arg -04/-03 2000 Mar 3 442 -3:00 Arg -03/-02 2008 Oct 18 443 -3:00 - -03 444# 445# Tucumán (TM) 446Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31 447 #STDOFF -4:16:48.25 448 -4:16:48 - CMT 1920 May 449 -4:00 - -04 1930 Dec 450 -4:00 Arg -04/-03 1969 Oct 5 451 -3:00 Arg -03/-02 1991 Mar 3 452 -4:00 - -04 1991 Oct 20 453 -3:00 Arg -03/-02 1999 Oct 3 454 -4:00 Arg -04/-03 2000 Mar 3 455 -3:00 - -03 2004 Jun 1 456 -4:00 - -04 2004 Jun 13 457 -3:00 Arg -03/-02 458# 459# La Rioja (LR) 460Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31 461 #STDOFF -4:16:48.25 462 -4:16:48 - CMT 1920 May 463 -4:00 - -04 1930 Dec 464 -4:00 Arg -04/-03 1969 Oct 5 465 -3:00 Arg -03/-02 1991 Mar 1 466 -4:00 - -04 1991 May 7 467 -3:00 Arg -03/-02 1999 Oct 3 468 -4:00 Arg -04/-03 2000 Mar 3 469 -3:00 - -03 2004 Jun 1 470 -4:00 - -04 2004 Jun 20 471 -3:00 Arg -03/-02 2008 Oct 18 472 -3:00 - -03 473# 474# San Juan (SJ) 475Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31 476 #STDOFF -4:16:48.25 477 -4:16:48 - CMT 1920 May 478 -4:00 - -04 1930 Dec 479 -4:00 Arg -04/-03 1969 Oct 5 480 -3:00 Arg -03/-02 1991 Mar 1 481 -4:00 - -04 1991 May 7 482 -3:00 Arg -03/-02 1999 Oct 3 483 -4:00 Arg -04/-03 2000 Mar 3 484 -3:00 - -03 2004 May 31 485 -4:00 - -04 2004 Jul 25 486 -3:00 Arg -03/-02 2008 Oct 18 487 -3:00 - -03 488# 489# Jujuy (JY) 490Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31 491 #STDOFF -4:16:48.25 492 -4:16:48 - CMT 1920 May 493 -4:00 - -04 1930 Dec 494 -4:00 Arg -04/-03 1969 Oct 5 495 -3:00 Arg -03/-02 1990 Mar 4 496 -4:00 - -04 1990 Oct 28 497 -4:00 1:00 -03 1991 Mar 17 498 -4:00 - -04 1991 Oct 6 499 -3:00 1:00 -02 1992 500 -3:00 Arg -03/-02 1999 Oct 3 501 -4:00 Arg -04/-03 2000 Mar 3 502 -3:00 Arg -03/-02 2008 Oct 18 503 -3:00 - -03 504# 505# Catamarca (CT), Chubut (CH) 506Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 507 #STDOFF -4:16:48.25 508 -4:16:48 - CMT 1920 May 509 -4:00 - -04 1930 Dec 510 -4:00 Arg -04/-03 1969 Oct 5 511 -3:00 Arg -03/-02 1991 Mar 3 512 -4:00 - -04 1991 Oct 20 513 -3:00 Arg -03/-02 1999 Oct 3 514 -4:00 Arg -04/-03 2000 Mar 3 515 -3:00 - -03 2004 Jun 1 516 -4:00 - -04 2004 Jun 20 517 -3:00 Arg -03/-02 2008 Oct 18 518 -3:00 - -03 519# 520# Mendoza (MZ) 521Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31 522 #STDOFF -4:16:48.25 523 -4:16:48 - CMT 1920 May 524 -4:00 - -04 1930 Dec 525 -4:00 Arg -04/-03 1969 Oct 5 526 -3:00 Arg -03/-02 1990 Mar 4 527 -4:00 - -04 1990 Oct 15 528 -4:00 1:00 -03 1991 Mar 1 529 -4:00 - -04 1991 Oct 15 530 -4:00 1:00 -03 1992 Mar 1 531 -4:00 - -04 1992 Oct 18 532 -3:00 Arg -03/-02 1999 Oct 3 533 -4:00 Arg -04/-03 2000 Mar 3 534 -3:00 - -03 2004 May 23 535 -4:00 - -04 2004 Sep 26 536 -3:00 Arg -03/-02 2008 Oct 18 537 -3:00 - -03 538# 539# San Luis (SL) 540 541Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 - 542Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 - 543 544Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31 545 #STDOFF -4:16:48.25 546 -4:16:48 - CMT 1920 May 547 -4:00 - -04 1930 Dec 548 -4:00 Arg -04/-03 1969 Oct 5 549 -3:00 Arg -03/-02 1990 550 -3:00 1:00 -02 1990 Mar 14 551 -4:00 - -04 1990 Oct 15 552 -4:00 1:00 -03 1991 Mar 1 553 -4:00 - -04 1991 Jun 1 554 -3:00 - -03 1999 Oct 3 555 -4:00 1:00 -03 2000 Mar 3 556 -3:00 - -03 2004 May 31 557 -4:00 - -04 2004 Jul 25 558 -3:00 Arg -03/-02 2008 Jan 21 559 -4:00 SanLuis -04/-03 2009 Oct 11 560 -3:00 - -03 561# 562# Santa Cruz (SC) 563Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 564 #STDOFF -4:16:48.25 565 -4:16:48 - CMT 1920 May 566 -4:00 - -04 1930 Dec 567 -4:00 Arg -04/-03 1969 Oct 5 568 -3:00 Arg -03/-02 1999 Oct 3 569 -4:00 Arg -04/-03 2000 Mar 3 570 -3:00 - -03 2004 Jun 1 571 -4:00 - -04 2004 Jun 20 572 -3:00 Arg -03/-02 2008 Oct 18 573 -3:00 - -03 574# 575# Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF) 576Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 577 #STDOFF -4:16:48.25 578 -4:16:48 - CMT 1920 May 579 -4:00 - -04 1930 Dec 580 -4:00 Arg -04/-03 1969 Oct 5 581 -3:00 Arg -03/-02 1999 Oct 3 582 -4:00 Arg -04/-03 2000 Mar 3 583 -3:00 - -03 2004 May 30 584 -4:00 - -04 2004 Jun 20 585 -3:00 Arg -03/-02 2008 Oct 18 586 -3:00 - -03 587 588# Bolivia 589# Zone NAME STDOFF RULES FORMAT [UNTIL] 590Zone America/La_Paz -4:32:36 - LMT 1890 591 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT 592 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST 593 -4:00 - -04 594 595# Brazil 596 597# From Paul Eggert (1993-11-18): 598# The mayor of Rio recently attempted to change the time zone rules 599# just in his city, in order to leave more summer time for the tourist trade. 600# The rule change lasted only part of the day; 601# the federal government refused to follow the city's rules, and business 602# was in a chaos, so the mayor backed down that afternoon. 603 604# From IATA SSIM (1996-02): 605# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 606# Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ), 607# Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO), 608# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 609# [The last three states are new to this issue of the IATA SSIM.] 610 611# From Gwillim Law (1996-10-07): 612# Geography, history (Tocantins was part of Goiás until 1989), and other 613# sources of time zone information lead me to believe that AL, SE, and TO were 614# always in BR1, and so the only change was whether or not they observed DST.... 615# The earliest issue of the SSIM I have is 2/91. Each issue from then until 616# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 617# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 618# (UTC-4).... The other two time zones given for Brazil are BR3, which is 619# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 620# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 621# become part of the state of Pernambuco). The boundary between BR1 and BR2 622# has never been clearly stated. They've simply been called East and West. 623# However, some conclusions can be drawn from another IATA manual: the Airline 624# Coding Directory, which lists close to 400 airports in Brazil. For each 625# airport it gives a time zone which is coded to the SSIM. From that 626# information, I'm led to conclude that the states of Amapá (AP), Ceará (CE), 627# Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do 628# Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST. 629 630# From Marcos Tadeu (1998-09-27): 631# Brazilian official page <http://pcdsh01.on.br/verao1.html> 632 633# From Jesper Nørgaard (2000-11-03): 634# [For an official list of which regions in Brazil use which time zones, see:] 635# http://pcdsh01.on.br/Fusbr.htm 636# http://pcdsh01.on.br/Fusbrhv.htm 637 638# From Celso Doria via David Madeo (2002-10-09): 639# The reason for the delay this year has to do with elections in Brazil. 640# 641# Unlike in the United States, elections in Brazil are 100% computerized and 642# the results are known almost immediately. Yesterday, it was the first 643# round of the elections when 115 million Brazilians voted for President, 644# Governor, Senators, Federal Deputies, and State Deputies. Nobody is 645# counting (or re-counting) votes anymore and we know there will be a second 646# round for the Presidency and also for some Governors. The 2nd round will 647# take place on October 27th. 648# 649# The reason why the DST will only begin November 3rd is that the thousands 650# of electoral machines used cannot have their time changed, and since the 651# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM, 652# the Government decided to postpone DST, instead of changing the Constitution 653# (maybe, for the next elections, it will be possible to change the clock)... 654 655# From Rodrigo Severo (2004-10-04): 656# It's just the biannual change made necessary by the much hyped, supposedly 657# modern Brazilian ... voting machines which, apparently, can't deal 658# with a time change between the first and the second rounds of the elections. 659 660# From Steffen Thorsen (2007-09-20): 661# Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: 662# http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975 663 664# From Paul Schulze (2008-06-24): 665# ...by law number 11.662 of April 24, 2008 (published in the "Diario 666# Oficial da União"...) in Brazil there are changes in the timezones, 667# effective today (00:00am at June 24, 2008) as follows: 668# 669# a) The timezone UTC+5 is extinguished, with all the Acre state and the 670# part of the Amazonas state that had this timezone now being put to the 671# timezone UTC+4 672# b) The whole Pará state now is put at timezone UTC+3, instead of just 673# part of it, as was before. 674# 675# This change follows a proposal of senator Tiao Viana of Acre state, that 676# proposed it due to concerns about open television channels displaying 677# programs inappropriate to youths in the states that had the timezone 678# UTC+5 too early in the night. In the occasion, some more corrections 679# were proposed, trying to unify the timezones of any given state. This 680# change modifies timezone rules defined in decree 2.784 of 18 June, 681# 1913. 682 683# From Rodrigo Severo (2008-06-24): 684# Just correcting the URL: 685# https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008 686# 687# As a result of the above Decree I believe the America/Rio_Branco 688# timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall 689# be created to represent the...west side of the Pará State. I 690# suggest this new timezone be called Santarem as the most 691# important/populated city in the affected area. 692# 693# This new timezone would be the same as the Rio_Branco timezone up to 694# the 2008/06/24 change which would be to UTC-3 instead of UTC-4. 695 696# From Alex Krivenyshev (2008-06-24): 697# This is a quick reference page for New and Old Brazil Time Zones map. 698# http://www.worldtimezone.com/brazil-time-new-old.php 699# 700# - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05 701# (state Acre and the part of the Amazonas will be UTC/GMT-04) - western 702# part of Par state is moving to one timezone UTC-03 (from UTC-04). 703 704# From Paul Eggert (2002-10-10): 705# The official decrees referenced below are mostly taken from 706# Decretos sobre o Horário de Verão no Brasil. 707# http://pcdsh01.on.br/DecHV.html 708 709# From Steffen Thorsen (2008-08-29): 710# As announced by the government and many newspapers in Brazil late 711# yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and 712# it will end on 2009-02-15 (current rule for Brazil is fine). Based on 713# past years experience with the elections, there was a good chance that 714# the start was postponed to November, but it did not happen this year. 715# 716# It has not yet been posted to http://pcdsh01.on.br/DecHV.html 717# 718# An official page about it: 719# http://www.mme.gov.br/site/news/detail.do?newsId=16722 720# Note that this link does not always work directly, but must be accessed 721# by going to 722# http://www.mme.gov.br/first 723# 724# One example link that works directly: 725# http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54 726# (Portuguese) 727# 728# We have a written a short article about it as well: 729# https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html 730# 731# From Alexander Krivenyshev (2011-10-04): 732# State Bahia will return to Daylight savings time this year after 8 years off. 733# The announcement was made by Governor Jaques Wagner in an interview to a 734# television station in Salvador. 735 736# In Portuguese: 737# http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html 738# https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html 739 740# From Guilherme Bernardes Rodrigues (2011-10-07): 741# There is news in the media, however there is still no decree about it. 742# I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the 743# official agency about time in Brazil, and she confirmed that the old rule is 744# still in force. 745 746# From Guilherme Bernardes Rodrigues (2011-10-14) 747# It's official, the President signed a decree that includes Bahia in summer 748# time. 749# [ and in a second message (same day): ] 750# I found the decree. 751# 752# DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011 753# Link : 754# http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6 755 756# From Kelley Cook (2012-10-16): 757# The governor of state of Bahia in Brazil announced on Thursday that 758# due to public pressure, he is reversing the DST policy they implemented 759# last year and will not be going to Summer Time on October 21st.... 760# http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia 761 762# From Rodrigo Severo (2012-10-16): 763# Tocantins state will have DST. 764# https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html 765 766# From Steffen Thorsen (2013-09-20): 767# Tocantins in Brazil is very likely not to observe DST from October.... 768# http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto 769# We will keep this article updated when this is confirmed: 770# https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html 771 772# From Steffen Thorsen (2013-10-17): 773# https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html 774# Senator Jorge Viana announced that Acre will change time zone on November 10. 775# He did not specify the time of the change, nor if western parts of Amazonas 776# will change as well. 777# 778# From Paul Eggert (2013-10-17): 779# For now, assume western Amazonas will change as well. 780 781# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 782# Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01) 783# Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10) 784Rule Brazil 1931 only - Oct 3 11:00 1:00 - 785Rule Brazil 1932 1933 - Apr 1 0:00 0 - 786Rule Brazil 1932 only - Oct 3 0:00 1:00 - 787# Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10) 788# revoked DST. 789# Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24) 790# Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13) 791Rule Brazil 1949 1952 - Dec 1 0:00 1:00 - 792Rule Brazil 1950 only - Apr 16 1:00 0 - 793Rule Brazil 1951 1952 - Apr 1 0:00 0 - 794# Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24) 795Rule Brazil 1953 only - Mar 1 0:00 0 - 796# Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30) 797# revoked DST. 798# Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18) 799# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 800# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 801# Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03) 802# extended the above decree to all of the national territory on 12-09. 803Rule Brazil 1963 only - Dec 9 0:00 1:00 - 804# Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25) 805# extended summer time by one day to 1964-03-01 00:00 (start of school). 806Rule Brazil 1964 only - Mar 1 0:00 0 - 807# Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27) 808Rule Brazil 1965 only - Jan 31 0:00 1:00 - 809Rule Brazil 1965 only - Mar 31 0:00 0 - 810# Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22) 811Rule Brazil 1965 only - Dec 1 0:00 1:00 - 812# Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18) 813Rule Brazil 1966 1968 - Mar 1 0:00 0 - 814Rule Brazil 1966 1967 - Nov 1 0:00 1:00 - 815# Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15) 816# revoked DST. 817# Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27) 818Rule Brazil 1985 only - Nov 2 0:00 1:00 - 819# Decree 92,310 (1986-01-21) 820# Decree 92,463 (1986-03-13) 821Rule Brazil 1986 only - Mar 15 0:00 0 - 822# Decree 93,316 (1986-10-01) 823Rule Brazil 1986 only - Oct 25 0:00 1:00 - 824Rule Brazil 1987 only - Feb 14 0:00 0 - 825# Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22) 826Rule Brazil 1987 only - Oct 25 0:00 1:00 - 827Rule Brazil 1988 only - Feb 7 0:00 0 - 828# Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12) 829# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 830Rule Brazil 1988 only - Oct 16 0:00 1:00 - 831Rule Brazil 1989 only - Jan 29 0:00 0 - 832# Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21) 833# with the same exceptions 834Rule Brazil 1989 only - Oct 15 0:00 1:00 - 835Rule Brazil 1990 only - Feb 11 0:00 0 - 836# Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17) 837# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 838# Decree 99,629 (1990-10-19) adds BA, MT. 839Rule Brazil 1990 only - Oct 21 0:00 1:00 - 840Rule Brazil 1991 only - Feb 17 0:00 0 - 841# Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25) 842# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 843Rule Brazil 1991 only - Oct 20 0:00 1:00 - 844Rule Brazil 1992 only - Feb 9 0:00 0 - 845# Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16) 846# adopted by same states. 847Rule Brazil 1992 only - Oct 25 0:00 1:00 - 848Rule Brazil 1993 only - Jan 31 0:00 0 - 849# Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28) 850# adopted by same states, plus AM. 851# Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22; 852# web page corrected 2004-01-07) adopted by same states, minus AM. 853# Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14) 854# adopted by same states, plus MT and TO. 855# Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13) 856# adds AL, SE. 857Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 - 858Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 859Rule Brazil 1996 only - Feb 11 0:00 0 - 860# Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04) 861# adopted by same states, minus AL, SE. 862Rule Brazil 1996 only - Oct 6 0:00 1:00 - 863Rule Brazil 1997 only - Feb 16 0:00 0 - 864# From Daniel C. Sobral (1998-02-12): 865# In 1997, the DS began on October 6. The stated reason was that 866# because international television networks ignored Brazil's policy on DS, 867# they bought the wrong times on satellite for coverage of Pope's visit. 868# This year, the ending date of DS was postponed to March 1 869# to help dealing with the shortages of electric power. 870# 871# Decree 2,317 (1997-09-04), adopted by same states. 872Rule Brazil 1997 only - Oct 6 0:00 1:00 - 873# Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG> 874# (1998-02-10) 875Rule Brazil 1998 only - Mar 1 0:00 0 - 876# Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11) 877# adopted by the same states as before. 878Rule Brazil 1998 only - Oct 11 0:00 1:00 - 879Rule Brazil 1999 only - Feb 21 0:00 0 - 880# Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif> 881# (1999-08-23) adopted by same states. 882# Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30) 883# adds SE, AL, PB, PE, RN, CE, PI, MA and RR. 884Rule Brazil 1999 only - Oct 3 0:00 1:00 - 885Rule Brazil 2000 only - Feb 27 0:00 0 - 886# Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06) 887# adopted by the same states as before. 888# Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13) 889# repeals DST in PE and RR, effective 2000-10-15 00:00. 890# Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17) 891# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. 892# Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif> 893# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE. 894Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 - 895Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 - 896# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE. 897# 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm> 898Rule Brazil 2002 only - Nov 3 0:00 1:00 - 899# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. 900# 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm> 901Rule Brazil 2003 only - Oct 19 0:00 1:00 - 902# Decree 5,223 (2004-10-01) reestablishes DST in MT. 903# 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm> 904Rule Brazil 2004 only - Nov 2 0:00 1:00 - 905# Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19), 906# adopted by the same states as before. 907Rule Brazil 2005 only - Oct 16 0:00 1:00 - 908# Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03), 909# adopted by the same states as before. 910Rule Brazil 2006 only - Nov 5 0:00 1:00 - 911Rule Brazil 2007 only - Feb 25 0:00 0 - 912# Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26), 913# adopted by the same states as before. 914Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 - 915# From Frederico A. C. Neves (2008-09-10): 916# According to this decree 917# http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm 918# [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the 919# 3rd Feb Sunday. There is an exception on the return date when this is 920# the Carnival Sunday then the return date will be the next Sunday... 921Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 - 922Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - 923# Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13) 924# added Bahia. 925Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - 926# Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15) 927# removed Bahia and added Tocantins. 928# Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30) 929# removed Tocantins. 930Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - 931Rule Brazil 2015 only - Feb Sun>=22 0:00 0 - 932Rule Brazil 2016 2019 - Feb Sun>=15 0:00 0 - 933# From Steffen Thorsen (2017-12-18): 934# According to many media sources, next year's DST start in Brazil will move to 935# the first Sunday of November 936# ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html 937# From Steffen Thorsen (2017-12-20): 938# http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm 939# From Fábio Gomes (2018-10-04): 940# The Brazilian president just announced a new change on this year DST. 941# It was scheduled to start on November 4th and it was changed to November 18th. 942# From Rodrigo Brüning Wessler (2018-10-15): 943# The Brazilian government just announced that the change in DST was 944# canceled.... Maybe the president Michel Temer also woke up one hour 945# earlier today. :) 946Rule Brazil 2018 only - Nov Sun>=1 0:00 1:00 - 947# The last ruleset listed above says that the following states observed DST: 948# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. 949# 950# From Steffen Thorsen (2019-04-05): 951# According to multiple sources the Brazilian president wants to get rid of DST. 952# https://gmconline.com.br/noticias/politica/bolsonaro-horario-de-verao-deve-acabar-este-ano 953# https://g1.globo.com/economia/noticia/2019/04/05/governo-anuncia-fim-do-horario-de-verao.ghtml 954# From Marcus Diniz (2019-04-25): 955# Brazil no longer has DST changes - decree signed today 956# https://g1.globo.com/politica/noticia/2019/04/25/bolsonaro-assina-decreto-que-acaba-com-o-horario-de-verao.ghtml 957# From Daniel Soares de Oliveira (2019-04-26): 958# http://www.planalto.gov.br/ccivil_03/_Ato2019-2022/2019/Decreto/D9772.htm 959 960# Zone NAME STDOFF RULES FORMAT [UNTIL] 961# 962# Fernando de Noronha (administratively part of PE) 963Zone America/Noronha -2:09:40 - LMT 1914 964 -2:00 Brazil -02/-01 1990 Sep 17 965 -2:00 - -02 1999 Sep 30 966 -2:00 Brazil -02/-01 2000 Oct 15 967 -2:00 - -02 2001 Sep 13 968 -2:00 Brazil -02/-01 2002 Oct 1 969 -2:00 - -02 970# Other Atlantic islands have no permanent settlement. 971# These include Trindade and Martim Vaz (administratively part of ES), 972# Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE). 973# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; 974# it also included the Penedos. 975# 976# Amapá (AP), east Pará (PA) 977# East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu. 978# The division between east and west Pará is the river Xingu. 979# In the north a very small part from the river Javary (now Jari I guess, 980# the border with Amapá) to the Amazon, then to the Xingu. 981Zone America/Belem -3:13:56 - LMT 1914 982 -3:00 Brazil -03/-02 1988 Sep 12 983 -3:00 - -03 984# 985# west Pará (PA) 986# West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém. 987Zone America/Santarem -3:38:48 - LMT 1914 988 -4:00 Brazil -04/-03 1988 Sep 12 989 -4:00 - -04 2008 Jun 24 0:00 990 -3:00 - -03 991# 992# Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN), 993# Paraíba (PB) 994Zone America/Fortaleza -2:34:00 - LMT 1914 995 -3:00 Brazil -03/-02 1990 Sep 17 996 -3:00 - -03 1999 Sep 30 997 -3:00 Brazil -03/-02 2000 Oct 22 998 -3:00 - -03 2001 Sep 13 999 -3:00 Brazil -03/-02 2002 Oct 1 1000 -3:00 - -03 1001# 1002# Pernambuco (PE) (except Atlantic islands) 1003Zone America/Recife -2:19:36 - LMT 1914 1004 -3:00 Brazil -03/-02 1990 Sep 17 1005 -3:00 - -03 1999 Sep 30 1006 -3:00 Brazil -03/-02 2000 Oct 15 1007 -3:00 - -03 2001 Sep 13 1008 -3:00 Brazil -03/-02 2002 Oct 1 1009 -3:00 - -03 1010# 1011# Tocantins (TO) 1012Zone America/Araguaina -3:12:48 - LMT 1914 1013 -3:00 Brazil -03/-02 1990 Sep 17 1014 -3:00 - -03 1995 Sep 14 1015 -3:00 Brazil -03/-02 2003 Sep 24 1016 -3:00 - -03 2012 Oct 21 1017 -3:00 Brazil -03/-02 2013 Sep 1018 -3:00 - -03 1019# 1020# Alagoas (AL), Sergipe (SE) 1021Zone America/Maceio -2:22:52 - LMT 1914 1022 -3:00 Brazil -03/-02 1990 Sep 17 1023 -3:00 - -03 1995 Oct 13 1024 -3:00 Brazil -03/-02 1996 Sep 4 1025 -3:00 - -03 1999 Sep 30 1026 -3:00 Brazil -03/-02 2000 Oct 22 1027 -3:00 - -03 2001 Sep 13 1028 -3:00 Brazil -03/-02 2002 Oct 1 1029 -3:00 - -03 1030# 1031# Bahia (BA) 1032# There are too many Salvadors elsewhere, so use America/Bahia instead 1033# of America/Salvador. 1034Zone America/Bahia -2:34:04 - LMT 1914 1035 -3:00 Brazil -03/-02 2003 Sep 24 1036 -3:00 - -03 2011 Oct 16 1037 -3:00 Brazil -03/-02 2012 Oct 21 1038 -3:00 - -03 1039# 1040# Goiás (GO), Distrito Federal (DF), Minas Gerais (MG), 1041# Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR), 1042# Santa Catarina (SC), Rio Grande do Sul (RS) 1043Zone America/Sao_Paulo -3:06:28 - LMT 1914 1044 -3:00 Brazil -03/-02 1963 Oct 23 0:00 1045 -3:00 1:00 -02 1964 1046 -3:00 Brazil -03/-02 1047# 1048# Mato Grosso do Sul (MS) 1049Zone America/Campo_Grande -3:38:28 - LMT 1914 1050 -4:00 Brazil -04/-03 1051# 1052# Mato Grosso (MT) 1053Zone America/Cuiaba -3:44:20 - LMT 1914 1054 -4:00 Brazil -04/-03 2003 Sep 24 1055 -4:00 - -04 2004 Oct 1 1056 -4:00 Brazil -04/-03 1057# 1058# Rondônia (RO) 1059Zone America/Porto_Velho -4:15:36 - LMT 1914 1060 -4:00 Brazil -04/-03 1988 Sep 12 1061 -4:00 - -04 1062# 1063# Roraima (RR) 1064Zone America/Boa_Vista -4:02:40 - LMT 1914 1065 -4:00 Brazil -04/-03 1988 Sep 12 1066 -4:00 - -04 1999 Sep 30 1067 -4:00 Brazil -04/-03 2000 Oct 15 1068 -4:00 - -04 1069# 1070# east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto 1071# The great circle line from Tabatinga to Porto Acre divides 1072# east from west Amazonas. 1073Zone America/Manaus -4:00:04 - LMT 1914 1074 -4:00 Brazil -04/-03 1988 Sep 12 1075 -4:00 - -04 1993 Sep 28 1076 -4:00 Brazil -04/-03 1994 Sep 22 1077 -4:00 - -04 1078# 1079# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, 1080# Eirunepé, Envira, Ipixuna 1081Zone America/Eirunepe -4:39:28 - LMT 1914 1082 -5:00 Brazil -05/-04 1988 Sep 12 1083 -5:00 - -05 1993 Sep 28 1084 -5:00 Brazil -05/-04 1994 Sep 22 1085 -5:00 - -05 2008 Jun 24 0:00 1086 -4:00 - -04 2013 Nov 10 1087 -5:00 - -05 1088# 1089# Acre (AC) 1090Zone America/Rio_Branco -4:31:12 - LMT 1914 1091 -5:00 Brazil -05/-04 1988 Sep 12 1092 -5:00 - -05 2008 Jun 24 0:00 1093 -4:00 - -04 2013 Nov 10 1094 -5:00 - -05 1095 1096# Chile 1097 1098# From Paul Eggert (2022-03-15): 1099# Shanks & Pottenger says America/Santiago introduced standard time in 1100# 1890 and rounds its UT offset to 70W40; guess that in practice this 1101# was the same offset as in 1916-1919. It also says Pacific/Easter 1102# standardized on 109W22 in 1890; assume this didn't change the clocks. 1103# 1104# Dates for America/Santiago from 1910 to 2004 are primarily from 1105# the following source, cited by Oscar van Vlijmen (2006-10-08): 1106# [1] Chile Law 1107# http://www.webexhibits.org/daylightsaving/chile.html 1108# This contains a copy of this official table: 1109# Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30) 1110# https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm 1111# [1] needs several corrections, though. 1112# 1113# The first set of corrections is from: 1114# [2] History of the Official Time of Chile 1115# http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See: 1116# https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html 1117# This is an English translation of: 1118# Historia de la hora oficial de Chile (retrieved 2012-10-24). See: 1119# https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm 1120# A fancier Spanish version (requiring mouse-clicking) is at: 1121# http://www.horaoficial.cl/historia_hora.php 1122# Conflicts between [1] and [2] were resolved as follows: 1123# 1124# - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites 1125# Boletín No. 1, Aviso No. 1 (1910). Go with [2]. 1126# 1127# - [1] says SMT was -4:42:45, [2] says Chile's official time from 1128# 1916 to 1919 was -4:42:46.3, the meridian of Chile's National 1129# Astronomical Observatory (OAN), then located in what is now 1130# Quinta Normal in Santiago. Go with [1], as this matches the meridian 1131# referred to by the relevant Chilean laws to this day. 1132# 1133# - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites 1134# Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2]. 1135# 1136# - [1] does not give times for transitions; assume they occur 1137# at midnight mainland time, the current common practice. However, 1138# go with [2]'s specification of 23:00 for the 1947-05-21 transition. 1139# 1140# Another correction to [1] is from Jesper Nørgaard Welen, who 1141# wrote (2006-10-08), "I think that there are some obvious mistakes in 1142# the suggested link from Oscar van Vlijmen,... for instance entry 66 1143# says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at 1144# 1990-09-15 (they should have been 1990-09-15 and 1990-09-16 1145# respectively), but anyhow it clears up some doubts too." 1146# 1147# Data for Pacific/Easter from 1910 through 1967 come from Shanks & 1148# Pottenger. After that, for lack of better info assume 1149# Pacific/Easter is always two hours behind America/Santiago; 1150# this is known to work for DST transitions starting in 2008 and 1151# may well be true for earlier transitions. 1152 1153# From Tim Parenti (2022-07-06): 1154# For a brief period of roughly six weeks in 1946, DST was only observed on an 1155# emergency basis in specific regions of central Chile; namely, "the national 1156# territory between the provinces of Coquimbo and Concepción, inclusive". 1157# This was enacted by Decree 3,891, dated 1946-07-13, and took effect 1158# 1946-07-14 24:00, advancing these central regions to -03. 1159# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460715/#page/1 1160# The decree contemplated "[t]hat this advancement of the Official Time, even 1161# though it has been proposed for the cities of Santiago and Valparaíso only, 1162# must be agreed with that of other cities, due to the connection of various 1163# activities that require it, such as, for example, the operation of rail 1164# services". It was originally set to expire after 30 days but was extended 1165# through 1946-08-31 by Decree 4,506, dated 1946-08-13. 1166# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460814/#page/1 1167# 1168# Law Number 8,522, promulgated 1946-08-27, reunified Chilean clocks at their 1169# new "Summer Time" of -04, reckoned as that of "the meridian of the 1170# Astronomical Observatory of Lo Espejo, advanced by 42 minutes and 45 1171# seconds". Although this law specified the new Summer Time to start on 1 1172# September each year, a special "transitional article" started it a few days 1173# early, as soon as the law took effect. As the law was to take force "from 1174# the date of its publication in the 'Diario Oficial', which happened the 1175# following day, presume the change took place in Santiago and its environs 1176# from 24:00 -03 to 23:00 -04 on Wednesday 1946-08-28. Although this was a 1177# no-op for wall clocks in the north and south of the country, put their formal 1178# start to DST an hour later when they reached 24:00 -04. 1179# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460828/#page/1 1180# After a brief "Winter Time" stint at -05 beginning 1947-04-01, Law Number 1181# 8,777, promulgated 1947-05-17, established year-round -04 "from 23:00 on the 1182# second day after it is published in the 'Diario Oficial'." It was published 1183# on Monday 1947-05-19 and so took effect from Wednesday 1947-05-21 23:00. 1184# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19470519/#page/1 1185 1186# From Eduardo Krell (1995-10-19): 1187# The law says to switch to DST at midnight [24:00] on the second SATURDAY 1188# of October.... The law is the same for March and October. 1189# (1998-09-29): 1190# Because of the drought this year, the government decided to go into 1191# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 1192# (unless there's another dry season next year, I guess). 1193 1194# From Julio I. Pacheco Troncoso (1999-03-18): 1195# Because of the same drought, the government decided to end DST later, 1196# on April 3, (one-time change). 1197 1198# From Germán Poo-Caamaño (2008-03-03): 1199# Due to drought, Chile extends Daylight Time in three weeks. This 1200# is one-time change (Saturday 3/29 at 24:00 for America/Santiago 1201# and Saturday 3/29 at 22:00 for Pacific/Easter) 1202# The Supreme Decree is located at 1203# http://www.shoa.cl/servicios/supremo316.pdf 1204# 1205# From José Miguel Garrido (2008-03-05): 1206# http://www.shoa.cl/noticias/2008/04hora/hora.htm 1207 1208# From Angel Chiang (2010-03-04): 1209# Subject: DST in Chile exceptionally extended to 3 April due to earthquake 1210# http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098 1211# 1212# From Arthur David Olson (2010-03-06): 1213# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch. 1214 1215# From Glenn Eychaner (2011-03-28): 1216# http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E} 1217# In English: 1218# Chile's clocks will go back an hour this year on the 7th of May instead 1219# of this Saturday. They will go forward again the 3rd Saturday in 1220# August, not in October as they have since 1968. 1221 1222# From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23): 1223# As stated in the website of the Chilean Energy Ministry 1224# http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html 1225# The Chilean Government has decided to postpone the entrance into winter time 1226# (to leave DST) from March 11 2012 to April 28th 2012.... 1227# Quote from the website communication: 1228# 1229# 6. For the year 2012, the dates of entry into winter time will be as follows: 1230# a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at 1231# 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00 1232# of the same day. 1233# b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is, 1234# at 23:59:59, instead of passing to 0:00, the time should be adjusted to be 1235# 01:00 on September 2. 1236 1237# From Steffen Thorsen (2013-02-15): 1238# According to several news sources, Chile has extended DST this year, 1239# they will end DST later and start DST earlier than planned. They 1240# hope to save energy. The new end date is 2013-04-28 00:00 and new 1241# start date is 2013-09-08 00:00.... 1242# http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm 1243 1244# From José Miguel Garrido (2014-02-19): 1245# Today appeared in the Diario Oficial a decree amending the time change 1246# dates to 2014. 1247# DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC) 1248# DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC) 1249# http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf 1250 1251# From Eduardo Romero Urra (2015-03-03): 1252# Today has been published officially that Chile will use the DST time 1253# permanently until March 25 of 2017 1254# http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg 1255# 1256# From Paul Eggert (2015-03-03): 1257# For now, assume that the extension will persist indefinitely. 1258 1259# From Juan Correa (2016-03-18): 1260# The decree regarding DST has been published in today's Official Gazette: 1261# http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/ 1262# http://www.leychile.cl/Navegar?idNorma=1088502 1263# It does consider the second Saturday of May and August as the dates 1264# for the transition; and it lists DST dates until 2019, but I think 1265# this scheme will stick. 1266# 1267# From Paul Eggert (2016-03-18): 1268# For now, assume the pattern holds for the indefinite future. 1269# The decree says transitions occur at 24:00; in practice this appears 1270# to mean 24:00 mainland time, not 24:00 local time, so that Easter 1271# Island is always two hours behind the mainland. 1272 1273# From Juan Correa (2016-12-04): 1274# Magallanes region ... will keep DST (UTC -3) all year round.... 1275# 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 1276# From Deborah Goldsmith (2017-01-19): 1277# http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf 1278 1279# From Juan Correa (2018-08-13): 1280# As of moments ago, the Ministry of Energy in Chile has announced the new 1281# schema for DST. ... Announcement in video (in Spanish): 1282# https://twitter.com/MinEnergia/status/1029000399129374720 1283# From Yonathan Dossow (2018-08-13): 1284# The video says "first Saturday of September", we all know it means Sunday at 1285# midnight. 1286# From Tim Parenti (2018-08-13): 1287# Translating the captions on the video at 0:44-0:55, "We want to announce as 1288# Government that from 2019, Winter Time will be increased to 5 months, between 1289# the first Saturday of April and the first Saturday of September." 1290# At 2:08-2:20, "The Magallanes region will maintain its current time, as 1291# decided by the citizens during 2017, but our Government will promote a 1292# regional dialogue table to gather their opinion on this matter." 1293# https://twitter.com/MinEnergia/status/1029009354001973248 1294# "We will keep the new time policy unchanged for at least the next 4 years." 1295# So we extend the new rules on Saturdays at 24:00 mainland time indefinitely. 1296# From Juan Correa (2019-02-04): 1297# http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/1498738.pdf 1298 1299# From Juan Correa (2022-04-02): 1300# I found there was a decree published last Thursday that will keep 1301# Magallanes region to UTC -3 "indefinitely". The decree is available at 1302# https://www.diariooficial.interior.gob.cl/publicaciones/2022/03/31/43217-B/01/2108910.pdf 1303 1304# From Juan Correa (2022-08-09): 1305# the Internal Affairs Ministry (Ministerio del Interior) informed DST 1306# for America/Santiago will start on midnight of September 11th; 1307# and will end on April 1st, 2023. Magallanes region (America/Punta_Arenas) 1308# will keep UTC -3 "indefinitely"... This is because on September 4th 1309# we will have a voting whether to approve a new Constitution. 1310# 1311# From Eduardo Romero Urra (2022-08-17): 1312# https://www.diariooficial.interior.gob.cl/publicaciones/2022/08/13/43327/01/2172567.pdf 1313# 1314# From Paul Eggert (2022-08-17): 1315# Although the presidential decree stops at fall 2026, assume that 1316# similar DST rules will continue thereafter. 1317 1318# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1319Rule Chile 1927 1931 - Sep 1 0:00 1:00 - 1320Rule Chile 1928 1932 - Apr 1 0:00 0 - 1321Rule Chile 1968 only - Nov 3 4:00u 1:00 - 1322Rule Chile 1969 only - Mar 30 3:00u 0 - 1323Rule Chile 1969 only - Nov 23 4:00u 1:00 - 1324Rule Chile 1970 only - Mar 29 3:00u 0 - 1325Rule Chile 1971 only - Mar 14 3:00u 0 - 1326Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 - 1327Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - 1328Rule Chile 1973 only - Sep 30 4:00u 1:00 - 1329Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 - 1330Rule Chile 1987 only - Apr 12 3:00u 0 - 1331Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 - 1332Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 - 1333Rule Chile 1990 only - Sep 16 4:00u 1:00 - 1334Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - 1335Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 - 1336Rule Chile 1997 only - Mar 30 3:00u 0 - 1337Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - 1338Rule Chile 1998 only - Sep 27 4:00u 1:00 - 1339Rule Chile 1999 only - Apr 4 3:00u 0 - 1340Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 - 1341Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 - 1342# N.B.: the end of March 29 in Chile is March 30 in Universal time, 1343# which is used below in specifying the transition. 1344Rule Chile 2008 only - Mar 30 3:00u 0 - 1345Rule Chile 2009 only - Mar Sun>=9 3:00u 0 - 1346Rule Chile 2010 only - Apr Sun>=1 3:00u 0 - 1347Rule Chile 2011 only - May Sun>=2 3:00u 0 - 1348Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 - 1349Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 - 1350Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 - 1351Rule Chile 2016 2018 - May Sun>=9 3:00u 0 - 1352Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 - 1353Rule Chile 2019 max - Apr Sun>=2 3:00u 0 - 1354Rule Chile 2019 2021 - Sep Sun>=2 4:00u 1:00 - 1355Rule Chile 2022 only - Sep Sun>=9 4:00u 1:00 - 1356Rule Chile 2023 max - Sep Sun>=2 4:00u 1:00 - 1357# IATA SSIM anomalies: (1992-02) says 1992-03-14; 1358# (1996-09) says 1998-03-08. Ignore these. 1359# Zone NAME STDOFF RULES FORMAT [UNTIL] 1360Zone America/Santiago -4:42:45 - LMT 1890 1361 -4:42:45 - SMT 1910 Jan 10 # Santiago Mean Time 1362 -5:00 - -05 1916 Jul 1 1363 -4:42:45 - SMT 1918 Sep 10 1364 -4:00 - -04 1919 Jul 1 1365 -4:42:45 - SMT 1927 Sep 1 1366 -5:00 Chile -05/-04 1932 Sep 1 1367 -4:00 - -04 1942 Jun 1 1368 -5:00 - -05 1942 Aug 1 1369 -4:00 - -04 1946 Jul 14 24:00 1370 -4:00 1:00 -03 1946 Aug 28 24:00 # central CL 1371 -5:00 1:00 -04 1947 Mar 31 24:00 1372 -5:00 - -05 1947 May 21 23:00 1373 -4:00 Chile -04/-03 1374Zone America/Punta_Arenas -4:43:40 - LMT 1890 1375 -4:42:45 - SMT 1910 Jan 10 1376 -5:00 - -05 1916 Jul 1 1377 -4:42:45 - SMT 1918 Sep 10 1378 -4:00 - -04 1919 Jul 1 1379 -4:42:45 - SMT 1927 Sep 1 1380 -5:00 Chile -05/-04 1932 Sep 1 1381 -4:00 - -04 1942 Jun 1 1382 -5:00 - -05 1942 Aug 1 1383 -4:00 - -04 1946 Aug 28 24:00 1384 -5:00 1:00 -04 1947 Mar 31 24:00 1385 -5:00 - -05 1947 May 21 23:00 1386 -4:00 Chile -04/-03 2016 Dec 4 1387 -3:00 - -03 1388Zone Pacific/Easter -7:17:28 - LMT 1890 1389 -7:17:28 - EMT 1932 Sep # Easter Mean Time 1390 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time 1391 -6:00 Chile -06/-05 1392# 1393# Salas y Gómez Island is uninhabited. 1394# Other Chilean locations, including Juan Fernández Is, Desventuradas Is, 1395# and Antarctic bases, are like America/Santiago. 1396 1397# Antarctic base using South American rules 1398# (See the file 'antarctica' for more.) 1399# 1400# Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) 1401# 1402# From Ethan Dicks (1996-10-06): 1403# It keeps the same time as Punta Arenas, Chile, because, just like us 1404# and the South Pole, that's the other end of their supply line.... 1405# I verified with someone who was there that since 1980, 1406# Palmer has followed Chile. Prior to that, before the Falklands War, 1407# Palmer used to be supplied from Argentina. 1408# 1409# Zone NAME STDOFF RULES FORMAT [UNTIL] 1410Zone Antarctica/Palmer 0 - -00 1965 1411 -4:00 Arg -04/-03 1969 Oct 5 1412 -3:00 Arg -03/-02 1982 May 1413 -4:00 Chile -04/-03 2016 Dec 4 1414 -3:00 - -03 1415 1416# Colombia 1417 1418# Milne gives 4:56:16.4 for Bogotá time in 1899. He writes, 1419# "A variation of fifteen minutes in the public clocks of Bogota is not rare." 1420 1421# From Alois Treindl (2022-11-10): 1422# End of time change in Colombia 1993 ... should be 6 February 24h ... 1423# DECRETO 267 DE 1993 1424# https://www.suin-juriscol.gov.co/viewDocument.asp?ruta=Decretos/1061335 1425 1426# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1427Rule CO 1992 only - May 3 0:00 1:00 - 1428Rule CO 1993 only - Feb 6 24:00 0 - 1429# Zone NAME STDOFF RULES FORMAT [UNTIL] 1430 #STDOFF -4:56:16.4 1431Zone America/Bogota -4:56:16 - LMT 1884 Mar 13 1432 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time 1433 -5:00 CO -05/-04 1434# Malpelo, Providencia, San Andres 1435# no information; probably like America/Bogota 1436 1437 1438# Ecuador 1439# 1440# Milne says the Central and South American Telegraph Company used -5:24:15. 1441# 1442# From Alois Treindl (2016-12-15): 1443# https://www.elcomercio.com/actualidad/hora-sixto-1993.html 1444# ... Whether the law applied also to Galápagos, I do not know. 1445# From Paul Eggert (2016-12-15): 1446# https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html 1447# This says President Sixto Durán Ballén signed decree No. 285, which 1448# established DST from 1992-11-28 to 1993-02-05; it does not give transition 1449# times. The people called it "hora de Sixto" ("Sixto hour"). The change did 1450# not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics 1451# that included "Amanecía en mitad de la noche, los guaguas iban a clase sin 1452# sol" ("It was dawning in the middle of the night, the buses went to class 1453# without sun"). Although Ballén's campaign slogan was "Ni un paso atrás" 1454# (Not one step back), the clocks went back in 1993 and the experiment was not 1455# repeated. For now, assume transitions were at 00:00 local time country-wide. 1456# 1457# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1458Rule Ecuador 1992 only - Nov 28 0:00 1:00 - 1459Rule Ecuador 1993 only - Feb 5 0:00 0 - 1460# 1461# Zone NAME STDOFF RULES FORMAT [UNTIL] 1462Zone America/Guayaquil -5:19:20 - LMT 1890 1463 -5:14:00 - QMT 1931 # Quito Mean Time 1464 -5:00 Ecuador -05/-04 1465Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 1466 -5:00 - -05 1986 1467 -6:00 Ecuador -06/-05 1468 1469# Falklands 1470 1471# From Paul Eggert (2006-03-22): 1472# Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except 1473# the IATA gives 1996-09-08. Go with Shanks & Pottenger. 1474 1475# From Falkland Islands Government Office, London (2001-01-22) 1476# via Jesper Nørgaard: 1477# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15 1478# April 2001 and advance one hour to summer time at 2 am on Sunday 2 1479# September. It is anticipated that the clocks will revert back at 2 1480# am on Sunday 21 April 2002 and advance to summer time at 2 am on 1481# Sunday 1 September. 1482 1483# From Rives McDow (2001-02-13): 1484# 1485# I have communicated several times with people there, and the last 1486# time I had communications that was helpful was in 1998. Here is 1487# what was said then: 1488# 1489# "The general rule was that Stanley used daylight saving and the Camp 1490# did not. However for various reasons many people in the Camp have 1491# started to use daylight saving (known locally as 'Stanley Time') 1492# There is no rule as to who uses daylight saving - it is a matter of 1493# personal choice and so it is impossible to draw a map showing who 1494# uses it and who does not. Any list would be out of date as soon as 1495# it was produced. This year daylight saving ended on April 18/19th 1496# and started again on September 12/13th. I do not know what the rule 1497# is, but can find out if you like. We do not change at the same time 1498# as UK or Chile." 1499# 1500# I did have in my notes that the rule was "Second Saturday in Sep at 1501# 0:00 until third Saturday in Apr at 0:00". I think that this does 1502# not agree in some cases with Shanks; is this true? 1503# 1504# Also, there is no mention in the list that some areas in the 1505# Falklands do not use DST. I have found in my communications there 1506# that these areas are on the western half of East Falkland and all of 1507# West Falkland. Stanley is the only place that consistently observes 1508# DST. Again, as in other places in the world, the farmers don't like 1509# it. West Falkland is almost entirely sheep farmers. 1510# 1511# I know one lady there that keeps a list of which farm keeps DST and 1512# which doesn't each year. She runs a shop in Stanley, and says that 1513# the list changes each year. She uses it to communicate to her 1514# customers, catching them when they are home for lunch or dinner. 1515 1516# From Paul Eggert (2001-03-05): 1517# For now, we'll just record the time in Stanley, since we have no 1518# better info. 1519 1520# From Steffen Thorsen (2011-04-01): 1521# The Falkland Islands will not turn back clocks this winter, but stay on 1522# daylight saving time. 1523# 1524# One source: 1525# http://www.falklandnews.com/public/story.cfm?get=5914&source=3 1526# 1527# We have gotten this confirmed by a clerk of the legislative assembly: 1528# Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the 1529# third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3 1530# hours) on the first Sunday of September at 0200hrs. 1531# 1532# IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands 1533# will not revert to local mean time, but clocks will remain on Summer 1534# time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term 1535# change to local time following the trial period will be notified. 1536# 1537# From Andrew Newman (2012-02-24) 1538# A letter from Justin McPhee, Chief Executive, 1539# Cable & Wireless Falkland Islands (dated 2012-02-22) 1540# states... 1541# The current Atlantic/Stanley entry under South America expects the 1542# clocks to go back to standard Falklands Time (FKT) on the 15th April. 1543# The database entry states that in 2011 Stanley was staying on fixed 1544# summer time on a trial basis only. FIG need to contact IANA and/or 1545# the maintainers of the database to inform them we're adopting 1546# the same policy this year and suggest recommendations for future years. 1547# 1548# For now we will assume permanent -03 for the Falklands 1549# until advised differently (to apply for 2012 and beyond, after the 2011 1550# experiment was apparently successful.) 1551# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1552Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 - 1553Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 1554Rule Falk 1939 only - Oct 1 0:00 1:00 - 1555Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 - 1556Rule Falk 1943 only - Jan 1 0:00 0 - 1557Rule Falk 1983 only - Sep lastSun 0:00 1:00 - 1558Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 1559Rule Falk 1984 only - Sep 16 0:00 1:00 - 1560Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 - 1561Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 - 1562Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 - 1563Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 - 1564# Zone NAME STDOFF RULES FORMAT [UNTIL] 1565Zone Atlantic/Stanley -3:51:24 - LMT 1890 1566 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 1567 -4:00 Falk -04/-03 1983 May 1568 -3:00 Falk -03/-02 1985 Sep 15 1569 -4:00 Falk -04/-03 2010 Sep 5 2:00 1570 -3:00 - -03 1571 1572# French Guiana 1573# For the 1911/1912 establishment of standard time in French possessions, see: 1574# Société Française de Physique, Recueil de constantes physiques (1913), 1575# page 752, 18b. 1576# Zone NAME STDOFF RULES FORMAT [UNTIL] 1577Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1 1578 -4:00 - -04 1967 Oct 1579 -3:00 - -03 1580 1581# Guyana 1582 1583# From P Chan (2020-11-27): 1584# https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547 1585# The Official Gazette of British Guiana. (New Series.) Vol. XL. July to 1586# December, 1915, p 1547, lists as several notes: 1587# "Local Mean Time 3 hours 52 mins. 39 secs. slow of Greenwich Mean Time 1588# (Georgetown.) From 1st August, 1911, British Guiana Standard Mean Time 4 1589# hours slow of Greenwich Mean Time, by notice in Official Gazette on 1st July, 1590# 1911. From 1st March, 1915, British Guiana Standard Mean Time 3 hours 45 1591# mins. 0 secs. slow of Greenwich Mean Time, by notice in Official Gazette on 1592# 23rd January, 1915." 1593# 1594# https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpretation_and_general_clauses_(amendment)_act_1975.pdf 1595# Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975) 1596# [dated 1975-07-31] 1597# "This Act...shall come into operation on 1st August, 1975." 1598# "...where any expression of time occurs...the time referred to shall signify 1599# the standard time of Guyana which shall be three hours behind Greenwich Mean 1600# Time." 1601# 1602# Circular No. 10/1992 dated 1992-03-20 1603# https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf 1604# "...cabinet has decided that with effect from Sunday 29th March, 1992, Guyana 1605# Standard Time would be re-established at 01:00 hours by adjusting the hands 1606# of the clock back to 24:00 hours." 1607# Legislated in the Interpretation and general clauses (Amendment) Act 1992 1608# (Act No. 6 of 1992) [passed 1992-03-27, published 1992-04-18] 1609# https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_general_clauses_(amendment)_act_1992.pdf 1610 1611# Zone NAME STDOFF RULES FORMAT [UNTIL] 1612Zone America/Guyana -3:52:39 - LMT 1911 Aug 1 # Georgetown 1613 -4:00 - -04 1915 Mar 1 1614 -3:45 - -0345 1975 Aug 1 1615 -3:00 - -03 1992 Mar 29 1:00 1616 -4:00 - -04 1617 1618# Paraguay 1619# 1620# From Paul Eggert (2006-03-22): 1621# Shanks & Pottenger say that spring transitions are 01:00 -> 02:00, 1622# and autumn transitions are 00:00 -> 23:00. Go with pre-1999 1623# editions of Shanks, and with the IATA, who say transitions occur at 00:00. 1624# 1625# From Waldemar Villamayor-Venialbo (2013-09-20): 1626# No time of the day is established for the adjustment, so people normally 1627# adjust their clocks at 0 hour of the given dates. 1628# 1629# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1630Rule Para 1975 1988 - Oct 1 0:00 1:00 - 1631Rule Para 1975 1978 - Mar 1 0:00 0 - 1632Rule Para 1979 1991 - Apr 1 0:00 0 - 1633Rule Para 1989 only - Oct 22 0:00 1:00 - 1634Rule Para 1990 only - Oct 1 0:00 1:00 - 1635Rule Para 1991 only - Oct 6 0:00 1:00 - 1636Rule Para 1992 only - Mar 1 0:00 0 - 1637Rule Para 1992 only - Oct 5 0:00 1:00 - 1638Rule Para 1993 only - Mar 31 0:00 0 - 1639Rule Para 1993 1995 - Oct 1 0:00 1:00 - 1640Rule Para 1994 1995 - Feb lastSun 0:00 0 - 1641Rule Para 1996 only - Mar 1 0:00 0 - 1642# IATA SSIM (2000-02) says 1999-10-10; ignore this for now. 1643# From Steffen Thorsen (2000-10-02): 1644# I have three independent reports that Paraguay changed to DST this Sunday 1645# (10-01). 1646# 1647# Translated by Gwillim Law (2001-02-27) from 1648# Noticias, a daily paper in Asunción, Paraguay (2000-10-01): 1649# http://www.diarionoticias.com.py/011000/nacional/naciona1.htm 1650# Starting at 0:00 today, the clock will be set forward 60 minutes, in 1651# fulfillment of Decree No. 7,273 of the Executive Power.... The time change 1652# system has been operating for several years. Formerly there was a separate 1653# decree each year; the new law has the same effect, but permanently. Every 1654# year, the time will change on the first Sunday of October; likewise, the 1655# clock will be set back on the first Sunday of March. 1656# 1657Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 - 1658# IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger. 1659Rule Para 1997 only - Feb lastSun 0:00 0 - 1660# Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but 1661# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27). 1662Rule Para 1998 2001 - Mar Sun>=1 0:00 0 - 1663# From Rives McDow (2002-02-28): 1664# A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the 1665# dst method to be from the first Sunday in September to the first Sunday in 1666# April. 1667Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - 1668Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 - 1669# 1670# From Jesper Nørgaard Welen (2005-01-02): 1671# There are several sources that claim that Paraguay made 1672# a timezone rule change in autumn 2004. 1673# From Steffen Thorsen (2005-01-05): 1674# Decree 1,867 (2004-03-05) 1675# From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13) 1676# http://www.presidencia.gov.py/decretos/D1867.pdf 1677Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 - 1678Rule Para 2005 2009 - Mar Sun>=8 0:00 0 - 1679# From Carlos Raúl Perasso (2010-02-18): 1680# By decree number 3958 issued yesterday 1681# http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf 1682# Paraguay changes its DST schedule, postponing the March rule to April and 1683# modifying the October date. The decree reads: 1684# ... 1685# Art. 1. It is hereby established that from the second Sunday of the month of 1686# April of this year (2010), the official time is to be set back 60 minutes, 1687# and that on the first Sunday of the month of October, it is to be set 1688# forward 60 minutes, in all the territory of the Paraguayan Republic. 1689# ... 1690Rule Para 2010 max - Oct Sun>=1 0:00 1:00 - 1691Rule Para 2010 2012 - Apr Sun>=8 0:00 0 - 1692# 1693# From Steffen Thorsen (2013-03-07): 1694# Paraguay will end DST on 2013-03-24 00:00.... 1695# http://www.ande.gov.py/interna.php?id=1075 1696# 1697# From Carlos Raúl Perasso (2013-03-15): 1698# The change in Paraguay is now final. Decree number 10780 1699# http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf 1700# From Carlos Raúl Perasso (2014-02-28): 1701# Decree 1264 can be found at: 1702# http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf 1703# 1704# From Paul Eggert (2023-07-26): 1705# Transition dates are now set by Law No. 7115, not by presidential decree. 1706# https://www.abc.com.py/politica/2023/07/12/promulgacion-el-cambio-de-hora-sera-por-ley/ 1707# From Carlos Raúl Perasso (2023-07-27): 1708# http://silpy.congreso.gov.py/descarga/ley-144138 1709Rule Para 2013 max - Mar Sun>=22 0:00 0 - 1710 1711# Zone NAME STDOFF RULES FORMAT [UNTIL] 1712Zone America/Asuncion -3:50:40 - LMT 1890 1713 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time 1714 -4:00 - -04 1972 Oct 1715 -3:00 - -03 1974 Apr 1716 -4:00 Para -04/-03 1717 1718# Peru 1719# 1720# From Evelyn C. Leeper via Mark Brader (2003-10-26) 1721# <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>: 1722# When we were in Peru in 1985-1986, they apparently switched over 1723# sometime between December 29 and January 3 while we were on the Amazon. 1724# 1725# From Paul Eggert (2006-03-22): 1726# Shanks & Pottenger don't have this transition. Assume 1986 was like 1987. 1727 1728# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1729Rule Peru 1938 only - Jan 1 0:00 1:00 - 1730Rule Peru 1938 only - Apr 1 0:00 0 - 1731Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 - 1732Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 1733Rule Peru 1986 1987 - Jan 1 0:00 1:00 - 1734Rule Peru 1986 1987 - Apr 1 0:00 0 - 1735Rule Peru 1990 only - Jan 1 0:00 1:00 - 1736Rule Peru 1990 only - Apr 1 0:00 0 - 1737# IATA is ambiguous for 1993/1995; go with Shanks & Pottenger. 1738Rule Peru 1994 only - Jan 1 0:00 1:00 - 1739Rule Peru 1994 only - Apr 1 0:00 0 - 1740# Zone NAME STDOFF RULES FORMAT [UNTIL] 1741Zone America/Lima -5:08:12 - LMT 1890 1742 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time? 1743 -5:00 Peru -05/-04 1744 1745# South Georgia 1746# Zone NAME STDOFF RULES FORMAT [UNTIL] 1747Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 1748 -2:00 - -02 1749 1750# South Sandwich Is 1751# uninhabited; scientific personnel have wintered 1752 1753# Suriname 1754# Zone NAME STDOFF RULES FORMAT [UNTIL] 1755Zone America/Paramaribo -3:40:40 - LMT 1911 1756 -3:40:52 - PMT 1935 # Paramaribo Mean Time 1757 -3:40:36 - PMT 1945 Oct # The capital moved? 1758 -3:30 - -0330 1984 Oct 1759 -3:00 - -03 1760 1761# Uruguay 1762# From Paul Eggert (1993-11-18): 1763# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 1764# 1765# From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael 1766# Deckers (2018-02-20): 1767# ... At least they kept good records... 1768# 1769# http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36 1770# Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and 1771# Meteorology Service of the Uruguayan Navy, seems to give many transitions 1772# with greater clarity than we've had before. It directly references many laws 1773# and decrees which are, in turn, referenced below. They can be viewed in the 1774# public archives of the Diario Oficial (in Spanish) at 1775# http://www.impo.com.uy/diariooficial/ 1776# 1777# Ley No. 3920 of 1908-06-10 placed the determination of legal time under the 1778# auspices of the National Institute for the Prediction of Time. It is unclear 1779# exactly what offset was used during this period, though Ley No. 7200 of 1780# 1920-04-23 used the Observatory of the National Meteorological Institute in 1781# Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian, 1782# retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00, 1783# resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on 1784# page 725 of the Proceedings of the Second Pan-American Scientific Congress, 1785# 1915-1916) was in use, and merely became official from 1908-06-10. 1786# https://www.impo.com.uy/diariooficial/1908/06/18/12 1787# https://www.impo.com.uy/diariooficial/1920/04/27/9 1788# 1789# Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced 1790# by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14 1791# minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the 1792# National Council of Administration the same day, published directly below the 1793# law in the Diario Oficial, specified the first transition to be 1923-09-30 1794# 24:00. This effectively established standard time at UT-03:30 with 30 1795# minutes DST. Assume transitions at 24:00 on the specified days until Ley No. 1796# 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other 1797# provisions which oppose" it, resulting in year-round UT-03:30; a Resolución 1798# of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it 1799# would have been under the previous law. 1800# https://www.impo.com.uy/diariooficial/1923/07/02/2 1801# https://www.impo.com.uy/diariooficial/1926/03/10/2 1802# https://www.impo.com.uy/diariooficial/1926/03/18/2 1803# 1804# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1805Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 - 1806Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 1807# From Tim Parenti (2018-02-15): 1808# http://www.impo.com.uy/diariooficial/1933/10/27/6 1809# 1810# It appears Ley No. 9122 of 1933 was never published as such in the Diario 1811# Oficial, but instead appeared as Document 26 in the Diario on Friday 1812# 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of 1813# National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the 1814# last Sunday of October...until the last Saturday of March." In accordance 1815# with this provision, the first transition was explicitly specified in Article 1816# 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29 1817# at 00:00. Assume transitions at 00:00 Sunday throughout. 1818# 1819# Departing from the matter-of-fact nature of previous timekeeping laws, the 1820# 1933 decree "consider[s] the advantages of...the advance of legal time": 1821# 1822# "Whereas: The measure adopted by almost all nations at the time of the last 1823# World War still persists in North America and Europe, precisely because of 1824# the economic, hygienic, and social advantages derived from such an 1825# emergency measure... 1826# 1827# Whereas: The advance of the legal time during the summer seasons, by 1828# displacing social activity near sunrise, favors the citizen populations 1829# and especially the society that creates and works..." 1830# 1831# It further specified that "necessary measures" be taken to ensure that 1832# "public spectacles finish, in general, before [01:00]." 1833Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 - 1834Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 - 1835# From Tim Parenti (2018-02-15): 1836# Most of the Rules below, and their contemporaneous Zone lines, have been 1837# updated simply to match the Almanaque 2018. Although the document does not 1838# list exact transition times, midnight transitions were already present in our 1839# data here for all transitions through 2004-09, and this is both consistent 1840# with prior transitions and verified in several decrees marked below between 1841# 1939-09 and 2004-09, wherein the relevant text was typically of the form: 1842# 1843# "From 0 hours on [date], the legal time of the entire Republic will be... 1844# 1845# In accordance with [the preceding], on [previous date] at 24 hours, all 1846# clocks throughout the Republic will be [advanced/retarded] by..." 1847# 1848# It is possible that there is greater specificity to be found for the Rules 1849# below, but it is buried in no fewer than 40 different decrees individually 1850# referenced by the Almanaque for the period from 1939-09 to 2014-09. 1851# Four-fifths of these were promulgated less than two weeks before taking 1852# effect; more than half within a week and none more than 5 weeks. Only the 1853# handful with comments below have been checked with any thoroughness. 1854Rule Uruguay 1939 only - Oct 1 0:00 0:30 - 1855Rule Uruguay 1940 only - Oct 27 0:00 0:30 - 1856# From Tim Parenti (2018-02-15): 1857# Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified 1858# UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel". 1859# http://www.impo.com.uy/diariooficial/1941/08/04/1 1860Rule Uruguay 1941 only - Aug 1 0:00 0:30 - 1861# From Tim Parenti (2018-02-15): 1862# Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified 1863# further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks 1864# never went back to UT-03:30 thereafter, this is modeled as advancing standard 1865# time by 30 minutes to UT-03, while retaining 30 minutes of DST. 1866# http://www.impo.com.uy/diariooficial/1942/12/16/3 1867Rule Uruguay 1942 only - Dec 14 0:00 0:30 - 1868Rule Uruguay 1943 only - Mar 14 0:00 0 - 1869Rule Uruguay 1959 only - May 24 0:00 0:30 - 1870Rule Uruguay 1959 only - Nov 15 0:00 0 - 1871Rule Uruguay 1960 only - Jan 17 0:00 1:00 - 1872Rule Uruguay 1960 only - Mar 6 0:00 0 - 1873Rule Uruguay 1965 only - Apr 4 0:00 1:00 - 1874Rule Uruguay 1965 only - Sep 26 0:00 0 - 1875# From Tim Parenti (2018-02-15): 1876# Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the 1877# day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00. 1878# http://www.impo.com.uy/diariooficial/1968/05/30/5 1879Rule Uruguay 1968 only - May 27 0:00 0:30 - 1880Rule Uruguay 1968 only - Dec 1 0:00 0 - 1881# From Tim Parenti (2018-02-15): 1882# Decreto 188/970 of 1970-04-23 instituted restrictions on electricity 1883# consumption "as a consequence of the current rainfall regime in the country". 1884# Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00. 1885# http://www.impo.com.uy/diariooficial/1970/04/29/4 1886Rule Uruguay 1970 only - Apr 25 0:00 1:00 - 1887Rule Uruguay 1970 only - Jun 14 0:00 0 - 1888Rule Uruguay 1972 only - Apr 23 0:00 1:00 - 1889Rule Uruguay 1972 only - Jul 16 0:00 0 - 1890# From Tim Parenti (2018-02-15): 1891# Decreto 29/974 of 1974-01-11, citing "the international rise in the price of 1892# oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of 1893# 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30 1894# minutes followed in Decreto 679/974 of 1974-08-29. 1895# http://www.impo.com.uy/diariooficial/1974/01/22/11 1896# http://www.impo.com.uy/diariooficial/1974/03/14/3 1897# http://www.impo.com.uy/diariooficial/1974/09/04/6 1898Rule Uruguay 1974 only - Jan 13 0:00 1:30 - 1899Rule Uruguay 1974 only - Mar 10 0:00 0:30 - 1900Rule Uruguay 1974 only - Sep 1 0:00 0 - 1901Rule Uruguay 1974 only - Dec 22 0:00 1:00 - 1902Rule Uruguay 1975 only - Mar 30 0:00 0 - 1903Rule Uruguay 1976 only - Dec 19 0:00 1:00 - 1904Rule Uruguay 1977 only - Mar 6 0:00 0 - 1905Rule Uruguay 1977 only - Dec 4 0:00 1:00 - 1906Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 - 1907Rule Uruguay 1978 only - Dec 17 0:00 1:00 - 1908Rule Uruguay 1979 only - Apr 29 0:00 1:00 - 1909Rule Uruguay 1980 only - Mar 16 0:00 0 - 1910# From Tim Parenti (2018-02-15): 1911# Decreto 725/987 of 1987-12-04 cited "better use of national tourist 1912# attractions" to advance clocks one hour from Monday 1987-12-14 00:00. 1913# http://www.impo.com.uy/diariooficial/1988/01/25/1 1914Rule Uruguay 1987 only - Dec 14 0:00 1:00 - 1915Rule Uruguay 1988 only - Feb 28 0:00 0 - 1916Rule Uruguay 1988 only - Dec 11 0:00 1:00 - 1917Rule Uruguay 1989 only - Mar 5 0:00 0 - 1918Rule Uruguay 1989 only - Oct 29 0:00 1:00 - 1919Rule Uruguay 1990 only - Feb 25 0:00 0 - 1920# From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04): 1921# IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the 1922# 1992/1993 season appears to be the first in over half a century where DST 1923# both began and ended pursuant to the same decree. 1924Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 - 1925Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 - 1926Rule Uruguay 1992 only - Oct 18 0:00 1:00 - 1927Rule Uruguay 1993 only - Feb 28 0:00 0 - 1928# From Eduardo Cota (2004-09-20): 1929# The Uruguayan government has decreed a change in the local time.... 1930# From Tim Parenti (2018-02-15): 1931# Decreto 328/004 of 2004-09-15. 1932# http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1 1933Rule Uruguay 2004 only - Sep 19 0:00 1:00 - 1934# From Steffen Thorsen (2005-03-11): 1935# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to 1936# save energy ... it was postponed two weeks.... 1937# From Tim Parenti (2018-02-15): 1938# This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous 1939# reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending 1940# Decreto 328/004: 1941# http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1 1942# The original decree specified a transition of 2005-03-12 24:00, but the new 1943# one specified 2005-03-27 02:00. 1944Rule Uruguay 2005 only - Mar 27 2:00 0 - 1945# From Eduardo Cota (2005-09-27): 1946# ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time, 1947# official time in Uruguay will be at GMT -2. 1948# From Tim Parenti (2018-02-15): 1949# Decreto 318/005 of 2005-09-19. 1950# http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1 1951Rule Uruguay 2005 only - Oct 9 2:00 1:00 - 1952Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 - 1953# From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06): 1954# Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday 1955# of October at 02:00 through the second Sunday of March at 02:00. Almanaque 1956# 2018 appears to have a few typoed dates through this period; ignore them. 1957# http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1 1958Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - 1959# From Steffen Thorsen (2015-06-30): 1960# ... it looks like they will not be using DST the coming summer: 1961# http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 1962# http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/ 1963# From Paul Eggert (2015-06-30): 1964# Apparently restaurateurs complained that DST caused people to go to the beach 1965# instead of out to dinner. 1966# From Pablo Camargo (2015-07-13): 1967# http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf 1968# From Tim Parenti (2018-02-15): 1969# Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. 1970 1971# This Zone can be simplified once we assume zic %z. 1972Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10 1973 -3:44:51 - MMT 1920 May 1 # Montevideo MT 1974 -4:00 - -04 1923 Oct 1 1975 -3:30 Uruguay -0330/-03 1942 Dec 14 1976 -3:00 Uruguay -03/-0230 1960 1977 -3:00 Uruguay -03/-02 1968 1978 -3:00 Uruguay -03/-0230 1970 1979 -3:00 Uruguay -03/-02 1974 1980 -3:00 Uruguay -03/-0130 1974 Mar 10 1981 -3:00 Uruguay -03/-0230 1974 Dec 22 1982 -3:00 Uruguay -03/-02 1983 1984# Venezuela 1985# 1986# From Paul Eggert (2015-07-28): 1987# For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533 1988# http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf 1989# 1990# From John Stainforth (2007-11-28): 1991# ... the change for Venezuela originally expected for 2007-12-31 has 1992# been brought forward to 2007-12-09. The official announcement was 1993# published today in the "Gaceta Oficial de la República Bolivariana 1994# de Venezuela, número 38.819" (official document for all laws or 1995# resolution publication) 1996# http://www.globovision.com/news.php?nid=72208 1997 1998# From Alexander Krivenyshev (2016-04-15): 1999# https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino 2000# 2001# From Paul Eggert (2016-04-15): 2002# Clocks advance 30 minutes on 2016-05-01 at 02:30.... 2003# "'Venezuela's new time-zone: hours without light, hours without water, 2004# hours of presidential broadcasts, hours of lines,' quipped comedian 2005# Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps 2006# half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400 2007# https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE 2008# 2009# From Matt Johnson (2016-04-20): 2010# ... published in the official Gazette [2016-04-18], here: 2011# http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf 2012 2013# Zone NAME STDOFF RULES FORMAT [UNTIL] 2014Zone America/Caracas -4:27:44 - LMT 1890 2015 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? 2016 -4:30 - -0430 1965 Jan 1 0:00 2017 -4:00 - -04 2007 Dec 9 3:00 2018 -4:30 - -0430 2016 May 1 2:30 2019 -4:00 - -04 2020
