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Diffstat (limited to 'southamerica')
| -rw-r--r-- | southamerica | 2019 |
1 files changed, 2019 insertions, 0 deletions
diff --git a/southamerica b/southamerica new file mode 100644 index 0000000..344e67f --- /dev/null +++ b/southamerica @@ -0,0 +1,2019 @@ +# tzdb data for South America and environs + +# This file is in the public domain, so clarified as of +# 2009-05-17 by Arthur David Olson. + +# This file is by no means authoritative; if you think you know better, +# go ahead and edit the file (and please send any changes to +# tz@iana.org for general use in the future). For more, please see +# the file CONTRIBUTING in the tz distribution. + +# From Paul Eggert (2016-12-05): +# +# Unless otherwise specified, the source for data through 1990 is: +# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), +# San Diego: ACS Publications, Inc. (2003). +# Unfortunately this book contains many errors and cites no sources. +# +# Many years ago Gwillim Law wrote that a good source +# for time zone data was the International Air Transport +# Association's Standard Schedules Information Manual (IATA SSIM), +# published semiannually. Law sent in several helpful summaries +# of the IATA's data after 1990. Except where otherwise noted, +# IATA SSIM is the source for entries after 1990. +# +# For data circa 1899, a common source is: +# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. +# https://www.jstor.org/stable/1774359 +# +# These tables use numeric abbreviations like -03 and -0330 for +# integer hour and minute UT offsets. Although earlier editions used +# alphabetic time zone abbreviations, these abbreviations were +# invented and did not reflect common practice. + +############################################################################### + +############################################################################### + +# Argentina + +# From Bob Devine (1988-01-28): +# Argentina: first Sunday in October to first Sunday in April since 1976. +# Double Summer time from 1969 to 1974. Switches at midnight. + +# From U. S. Naval Observatory (1988-01-19): +# ARGENTINA 3 H BEHIND UTC + +# From Hernan G. Otero (1995-06-26): +# I am sending modifications to the Argentine time zone table... +# AR was chosen because they are the ISO letters that represent Argentina. + +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule Arg 1930 only - Dec 1 0:00 1:00 - +Rule Arg 1931 only - Apr 1 0:00 0 - +Rule Arg 1931 only - Oct 15 0:00 1:00 - +Rule Arg 1932 1940 - Mar 1 0:00 0 - +Rule Arg 1932 1939 - Nov 1 0:00 1:00 - +Rule Arg 1940 only - Jul 1 0:00 1:00 - +Rule Arg 1941 only - Jun 15 0:00 0 - +Rule Arg 1941 only - Oct 15 0:00 1:00 - +Rule Arg 1943 only - Aug 1 0:00 0 - +Rule Arg 1943 only - Oct 15 0:00 1:00 - +Rule Arg 1946 only - Mar 1 0:00 0 - +Rule Arg 1946 only - Oct 1 0:00 1:00 - +Rule Arg 1963 only - Oct 1 0:00 0 - +Rule Arg 1963 only - Dec 15 0:00 1:00 - +Rule Arg 1964 1966 - Mar 1 0:00 0 - +Rule Arg 1964 1966 - Oct 15 0:00 1:00 - +Rule Arg 1967 only - Apr 2 0:00 0 - +Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 - +Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 - +Rule Arg 1974 only - Jan 23 0:00 1:00 - +Rule Arg 1974 only - May 1 0:00 0 - +Rule Arg 1988 only - Dec 1 0:00 1:00 - +# +# From Hernan G. Otero (1995-06-26): +# These corrections were contributed by InterSoft Argentina S.A., +# obtaining the data from the: +# Talleres de Hidrografía Naval Argentina +# (Argentine Naval Hydrography Institute) +Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 - +Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 - +# +# From Hernan G. Otero (1995-06-26): +# From this moment on, the law that mandated the daylight saving +# time corrections was derogated and no more modifications +# to the time zones (for daylight saving) are now made. +# +# From Rives McDow (2000-01-10): +# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time, +# which did not result in the switch of a time zone, as they stayed 9 hours +# from the International Date Line. +Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 - +# From Paul Eggert (2007-12-28): +# DST was set to expire on March 5, not March 3, but since it was converted +# to standard time on March 3 it's more convenient for us to pretend that +# it ended on March 3. +Rule Arg 2000 only - Mar 3 0:00 0 - +# +# From Peter Gradelski via Steffen Thorsen (2000-03-01): +# We just checked with our São Paulo office and they say the government of +# Argentina decided not to become one of the countries that go on or off DST. +# So Buenos Aires should be -3 hours from GMT at all times. +# +# From Fabián L. Arce Jofré (2000-04-04): +# The law that claimed DST for Argentina was derogated by President Fernando +# de la Rúa on March 2, 2000, because it would make people spend more energy +# in the winter time, rather than less. The change took effect on March 3. +# +# From Mariano Absatz (2001-06-06): +# one of the major newspapers here in Argentina said that the 1999 +# Timezone Law (which never was effectively applied) will (would?) be +# in effect.... The article is at +# http://ar.clarin.com/diario/2001-06-06/e-01701.htm +# ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted +# 1999-09-17, and published 1999-09-21. The official publication is at: +# http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF +# Regretfully, you have to subscribe (and pay) for the on-line version.... +# +# (2001-06-12): +# the timezone for Argentina will not change next Sunday. +# Apparently it will do so on Sunday 24th.... +# http://ar.clarin.com/diario/2001-06-12/s-03501.htm +# +# (2001-06-25): +# Last Friday (yes, the last working day before the date of the change), the +# Senate annulled the 1999 law that introduced the changes later postponed. +# http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm +# It remains the vote of the Deputies..., but it will be the same.... +# This kind of things had always been done this way in Argentina. +# We are still -03:00 all year round in all of the country. +# +# From Steffen Thorsen (2007-12-21): +# A user (Leonardo Chaim) reported that Argentina will adopt DST.... +# all of the country (all Zone-entries) are affected. News reports like +# http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate +# that Argentina will use DST next year as well, from October to +# March, although exact rules are not given. +# +# From Jesper Nørgaard Welen (2007-12-26) +# The last hurdle of Argentina DST is over, the proposal was approved in +# the lower chamber too (Diputados) with a vote 192 for and 2 against. +# By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to +# the original scanned proposal, where the dates and the zero hours are +# clear and unambiguous...This is the article about final approval: +# http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996 +# +# From Paul Eggert (2007-12-22): +# For dates after mid-2008, the following rules are my guesses and +# are quite possibly wrong, but are more likely than no DST at all. + +# From Alexander Krivenyshev (2008-09-05): +# As per message from Carlos Alberto Fonseca Arauz (Nicaragua), +# Argentina will start DST on Sunday October 19, 2008. +# +# http://www.worldtimezone.com/dst_news/dst_news_argentina03.html +# http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish) + +# From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07) +# via Rodrigo Severo: +# Argentinian law No. 25.155 is no longer valid. +# http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm +# The new one is law No. 26.350 +# http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm +# So there is no summer time in Argentina for now. + +# From Mariano Absatz (2008-10-20): +# Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST +# in Argentina from 2008-10-19 until 2009-03-15. +# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01 +# + +# Decree 1705/2008 excepting 12 Provinces from applying DST in the summer +# 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La +# Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego +# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01 +# +# Press release 235 dated Saturday October 18th, from the Government of the +# Province of Jujuy saying it will not apply DST either (even when it was not +# included in Decree 1705/2008). +# http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc + +# From fullinet (2009-10-18): +# As announced in +# http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356 +# (an official .gob.ar) under title: "Sin Cambio de Hora" +# (English: "No hour change"). +# +# "Por el momento, el Gobierno Nacional resolvió no modificar la hora +# oficial, decisión que estaba en estudio para su implementación el +# domingo 18 de octubre. Desde el Ministerio de Planificación se anunció +# que la Argentina hoy, en estas condiciones meteorológicas, no necesita +# la modificación del huso horario, ya que 2009 nos encuentra con +# crecimiento en la producción y distribución energética." + +Rule Arg 2007 only - Dec 30 0:00 1:00 - +Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 - +Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 - + +# From Mariano Absatz (2004-05-21): +# Today it was officially published that the Province of Mendoza is changing +# its timezone this winter... starting tomorrow night.... +# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf +# From Paul Eggert (2004-05-24): +# It's Law No. 7,210. This change is due to a public power emergency, so for +# now we'll assume it's for this year only. +# +# From Paul Eggert (2018-01-31): +# Hora de verano para la República Argentina +# http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html +# says that standard time in Argentina from 1894-10-31 +# to 1920-05-01 was -4:16:48.25. Go with this more precise value +# over Shanks & Pottenger. It is upward compatible with Milne, who +# says Córdoba time was -4:16:48.2. + +# +# From Mariano Absatz (2004-06-05): +# These media articles from a major newspaper mostly cover the current state: +# http://www.lanacion.com.ar/04/05/27/de_604825.asp +# http://www.lanacion.com.ar/04/05/28/de_605203.asp +# +# The following eight (8) provinces pulled clocks back to UTC-04:00 at +# midnight Monday May 31st. (that is, the night between 05/31 and 06/01). +# Apparently, all nine provinces would go back to UTC-03:00 at the same +# time in October 17th. +# +# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz, +# Tierra del Fuego, Tucumán. +# +# From Mariano Absatz (2004-06-14): +# ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00 +# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's +# annoyance with the change is much higher than the power savings obtained.... +# +# From Gwillim Law (2004-06-14): +# http://www.lanacion.com.ar/04/06/10/de_609078.asp ... +# "The time change in Tierra del Fuego was a conflicted decision from +# the start. The government had decreed that the measure would take +# effect on June 1, but a normative error forced the new time to begin +# three days earlier, from a Saturday to a Sunday.... +# Our understanding was that the change was originally scheduled to take place +# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other +# provinces). Sunday was May 30, only two days earlier. So the article +# contains a contradiction. I would give more credence to the Saturday/Sunday +# date than the "three days earlier" phrase, and conclude that Tierra del +# Fuego set its clocks back at 2004-05-30 00:00. +# +# From Steffen Thorsen (2004-10-05): +# The previous law 7210 which changed the province of Mendoza's time zone +# back in May have been modified slightly in a new law 7277, which set the +# new end date to 2004-09-26 (original date was 2004-10-17). +# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf +# +# From Mariano Absatz (2004-10-05): +# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between +# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00 +# at midnight between Saturday, July 24th and Sunday, July 25th.... +# http://www.sanjuan.gov.ar/prensa/archivo/000329.html +# http://www.sanjuan.gov.ar/prensa/archivo/000426.html +# http://www.sanjuan.gov.ar/prensa/archivo/000441.html + +# From Alex Krivenyshev (2008-01-17): +# Here are articles that Argentina Province San Luis is planning to end DST +# as earlier as upcoming Monday January 21, 2008 or February 2008: +# +# Provincia argentina retrasa reloj y marca diferencia con resto del país +# (Argentine Province delayed clock and mark difference with the rest of the +# country) +# http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel +# +# Es inminente que en San Luis atrasen una hora los relojes +# (It is imminent in San Luis clocks one hour delay) +# https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html +# http://www.worldtimezone.com/dst_news/dst_news_argentina02.html + +# From Jesper Nørgaard Welen (2008-01-18): +# The page of the San Luis provincial government +# http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812 +# confirms what Alex Krivenyshev has earlier sent to the tz +# emailing list about that San Luis plans to return to standard +# time much earlier than the rest of the country. It also +# confirms that upon request the provinces San Juan and Mendoza +# refused to follow San Luis in this change. +# +# The change is supposed to take place Monday the 21st at 0:00 +# hours. As far as I understand it if this goes ahead, we need +# a new timezone for San Luis (although there are also documented +# independent changes in the southamerica file of San Luis in +# 1990 and 1991 which has not been confirmed). + +# From Jesper Nørgaard Welen (2008-01-25): +# Unfortunately the below page has become defunct, about the San Luis +# time change. Perhaps because it now is part of a group of pages "Most +# important pages of 2008." +# +# You can use +# http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834 +# instead it seems. Or use "Buscador" from the main page of the San Luis +# government, and fill in "huso" and click OK, and you will get 3 pages +# from which the first one is identical to the above. + +# From Mariano Absatz (2008-01-28): +# I can confirm that the Province of San Luis (and so far only that +# province) decided to go back to UTC-3 effective midnight Jan 20th 2008 +# (that is, Monday 21st at 0:00 is the time the clocks were delayed back +# 1 hour), and they intend to keep UTC-3 as their timezone all year round +# (that is, unless they change their mind any minute now). +# +# So we'll have to add yet another city to 'southamerica' (I think San +# Luis city is the mos populated city in the Province, so it'd be +# America/Argentina/San_Luis... of course I can't remember if San Luis's +# history of particular changes goes along with Mendoza or San Juan :-( +# (I only remember not being able to collect hard facts about San Luis +# back in 2004, when these provinces changed to UTC-4 for a few days, I +# mailed them personally and never got an answer). + +# From Paul Eggert (2014-08-12): +# Unless otherwise specified, data entries are from Shanks & Pottenger through +# 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that +# America/Cordoba split into 6 subregions during 1991/1992, one of which +# was America/San_Luis, but we haven't verified this yet so for now we'll +# keep America/Cordoba a single region rather than splitting it into the +# other 5 subregions. + +# From Mariano Absatz (2009-03-13): +# Yesterday (with our usual 2-day notice) the Province of San Luis +# decided that next Sunday instead of "staying" @utc-03:00 they will go +# to utc-04:00 until the second Saturday in October... +# +# The press release is at +# http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102 +# (I couldn't find the decree, but www.sanluis.gov.ar +# is the official page for the Province Government.) +# +# There's also a note in only one of the major national papers ... +# http://www.lanacion.com.ar/nota.asp?nota_id=1107912 +# +# The press release says [quick and dirty translation]: +# ... announced that next Sunday, at 00:00, Puntanos (the San Luis +# inhabitants) will have to turn back one hour their clocks +# +# Since then, San Luis will establish its own Province timezone. Thus, +# during 2009, this timezone change will run from 00:00 the third Sunday +# in March until 24:00 of the second Saturday in October. + +# From Mariano Absatz (2009-10-16): +# ...the Province of San Luis is a case in itself. +# +# The Law at +# http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276 +# is ambiguous because establishes a calendar from the 2nd Sunday in +# October at 0:00 thru the 2nd Saturday in March at 24:00 and the +# complement of that starting on the 2nd Sunday of March at 0:00 and +# ending on the 2nd Saturday of March at 24:00. +# +# This clearly breaks every time the 1st of March or October is a Sunday. +# +# IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd +# Sunday of October and March. +# +# The problem is that the changes in the rest of the Provinces that did +# change in 2007/2008, were made according to the Federal Law and Decrees +# that did so on the 3rd Sunday of October and March. +# +# In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday +# (October 11th) at 0:00. +# +# So I guess a new set of rules, besides "Arg", must be made and the last +# America/Argentina/San_Luis entries should change to use these... +# ... + +# From Alexander Krivenyshev (2010-04-09): +# According to news reports from El Diario de la República Province San +# Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time +# after April 11, 2010 - will continue to have same time as rest of +# Argentina (UTC-3) (no DST). +# +# Confirmaron la prórroga del huso horario de verano (Spanish) +# http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9 +# or (some English translation): +# http://www.worldtimezone.com/dst_news/dst_news_argentina08.html + +# From Mariano Absatz (2010-04-12): +# yes...I can confirm this...and given that San Luis keeps calling +# UTC-03:00 "summer time", we should't just let San Luis go back to "Arg" +# rules...San Luis is still using "Western ARgentina Time" and it got +# stuck on Summer daylight savings time even though the summer is over. + +# From Paul Eggert (2018-01-23): +# Perhaps San Luis operates on the legal fiction that it is at -04 +# with perpetual daylight saving time, but ordinary usage typically seems to +# just say it's at -03; see, for example, +# https://es.wikipedia.org/wiki/Hora_oficial_argentina +# We've documented similar situations as being plain changes to +# standard time, so let's do that here too. This does not change UTC +# offsets, only tm_isdst and the time zone abbreviations. One minor +# plus is that this silences a zic complaint that there's no POSIX TZ +# setting for timestamps past 2038. + +# Zone NAME STDOFF RULES FORMAT [UNTIL] +# +# Buenos Aires (BA), Capital Federal (CF), +Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May # Córdoba Mean Time + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 Arg -03/-02 +# +# Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN), +# Chaco (CC), Formosa (FM), Santiago del Estero (SE) +# +# Shanks & Pottenger also make the following claims, which we haven't verified: +# - Formosa switched to -3:00 on 1991-01-07. +# - Misiones switched to -3:00 on 1990-12-29. +# - Chaco switched to -3:00 on 1991-01-04. +# - Santiago del Estero switched to -4:00 on 1991-04-01, +# then to -3:00 on 1991-04-26. +# + #STDOFF -4:16:48.25 +Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1991 Mar 3 + -4:00 - -04 1991 Oct 20 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 Arg -03/-02 +# +# Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN) +Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1991 Mar 3 + -4:00 - -04 1991 Oct 20 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 Arg -03/-02 2008 Oct 18 + -3:00 - -03 +# +# Tucumán (TM) +Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1991 Mar 3 + -4:00 - -04 1991 Oct 20 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 - -03 2004 Jun 1 + -4:00 - -04 2004 Jun 13 + -3:00 Arg -03/-02 +# +# La Rioja (LR) +Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1991 Mar 1 + -4:00 - -04 1991 May 7 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 - -03 2004 Jun 1 + -4:00 - -04 2004 Jun 20 + -3:00 Arg -03/-02 2008 Oct 18 + -3:00 - -03 +# +# San Juan (SJ) +Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1991 Mar 1 + -4:00 - -04 1991 May 7 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 - -03 2004 May 31 + -4:00 - -04 2004 Jul 25 + -3:00 Arg -03/-02 2008 Oct 18 + -3:00 - -03 +# +# Jujuy (JY) +Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1990 Mar 4 + -4:00 - -04 1990 Oct 28 + -4:00 1:00 -03 1991 Mar 17 + -4:00 - -04 1991 Oct 6 + -3:00 1:00 -02 1992 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 Arg -03/-02 2008 Oct 18 + -3:00 - -03 +# +# Catamarca (CT), Chubut (CH) +Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1991 Mar 3 + -4:00 - -04 1991 Oct 20 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 - -03 2004 Jun 1 + -4:00 - -04 2004 Jun 20 + -3:00 Arg -03/-02 2008 Oct 18 + -3:00 - -03 +# +# Mendoza (MZ) +Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1990 Mar 4 + -4:00 - -04 1990 Oct 15 + -4:00 1:00 -03 1991 Mar 1 + -4:00 - -04 1991 Oct 15 + -4:00 1:00 -03 1992 Mar 1 + -4:00 - -04 1992 Oct 18 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 - -03 2004 May 23 + -4:00 - -04 2004 Sep 26 + -3:00 Arg -03/-02 2008 Oct 18 + -3:00 - -03 +# +# San Luis (SL) + +Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 - +Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 - + +Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1990 + -3:00 1:00 -02 1990 Mar 14 + -4:00 - -04 1990 Oct 15 + -4:00 1:00 -03 1991 Mar 1 + -4:00 - -04 1991 Jun 1 + -3:00 - -03 1999 Oct 3 + -4:00 1:00 -03 2000 Mar 3 + -3:00 - -03 2004 May 31 + -4:00 - -04 2004 Jul 25 + -3:00 Arg -03/-02 2008 Jan 21 + -4:00 SanLuis -04/-03 2009 Oct 11 + -3:00 - -03 +# +# Santa Cruz (SC) +Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 - -03 2004 Jun 1 + -4:00 - -04 2004 Jun 20 + -3:00 Arg -03/-02 2008 Oct 18 + -3:00 - -03 +# +# Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF) +Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 + #STDOFF -4:16:48.25 + -4:16:48 - CMT 1920 May + -4:00 - -04 1930 Dec + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1999 Oct 3 + -4:00 Arg -04/-03 2000 Mar 3 + -3:00 - -03 2004 May 30 + -4:00 - -04 2004 Jun 20 + -3:00 Arg -03/-02 2008 Oct 18 + -3:00 - -03 + +# Bolivia +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/La_Paz -4:32:36 - LMT 1890 + -4:32:36 - CMT 1931 Oct 15 # Calamarca MT + -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST + -4:00 - -04 + +# Brazil + +# From Paul Eggert (1993-11-18): +# The mayor of Rio recently attempted to change the time zone rules +# just in his city, in order to leave more summer time for the tourist trade. +# The rule change lasted only part of the day; +# the federal government refused to follow the city's rules, and business +# was in a chaos, so the mayor backed down that afternoon. + +# From IATA SSIM (1996-02): +# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), +# Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ), +# Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO), +# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. +# [The last three states are new to this issue of the IATA SSIM.] + +# From Gwillim Law (1996-10-07): +# Geography, history (Tocantins was part of Goiás until 1989), and other +# sources of time zone information lead me to believe that AL, SE, and TO were +# always in BR1, and so the only change was whether or not they observed DST.... +# The earliest issue of the SSIM I have is 2/91. Each issue from then until +# 9/95 says that DST is observed only in the ten states I quoted from 9/95, +# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 +# (UTC-4).... The other two time zones given for Brazil are BR3, which is +# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is +# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's +# become part of the state of Pernambuco). The boundary between BR1 and BR2 +# has never been clearly stated. They've simply been called East and West. +# However, some conclusions can be drawn from another IATA manual: the Airline +# Coding Directory, which lists close to 400 airports in Brazil. For each +# airport it gives a time zone which is coded to the SSIM. From that +# information, I'm led to conclude that the states of Amapá (AP), Ceará (CE), +# Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do +# Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST. + +# From Marcos Tadeu (1998-09-27): +# Brazilian official page <http://pcdsh01.on.br/verao1.html> + +# From Jesper Nørgaard (2000-11-03): +# [For an official list of which regions in Brazil use which time zones, see:] +# http://pcdsh01.on.br/Fusbr.htm +# http://pcdsh01.on.br/Fusbrhv.htm + +# From Celso Doria via David Madeo (2002-10-09): +# The reason for the delay this year has to do with elections in Brazil. +# +# Unlike in the United States, elections in Brazil are 100% computerized and +# the results are known almost immediately. Yesterday, it was the first +# round of the elections when 115 million Brazilians voted for President, +# Governor, Senators, Federal Deputies, and State Deputies. Nobody is +# counting (or re-counting) votes anymore and we know there will be a second +# round for the Presidency and also for some Governors. The 2nd round will +# take place on October 27th. +# +# The reason why the DST will only begin November 3rd is that the thousands +# of electoral machines used cannot have their time changed, and since the +# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM, +# the Government decided to postpone DST, instead of changing the Constitution +# (maybe, for the next elections, it will be possible to change the clock)... + +# From Rodrigo Severo (2004-10-04): +# It's just the biannual change made necessary by the much hyped, supposedly +# modern Brazilian ... voting machines which, apparently, can't deal +# with a time change between the first and the second rounds of the elections. + +# From Steffen Thorsen (2007-09-20): +# Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: +# http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975 + +# From Paul Schulze (2008-06-24): +# ...by law number 11.662 of April 24, 2008 (published in the "Diario +# Oficial da União"...) in Brazil there are changes in the timezones, +# effective today (00:00am at June 24, 2008) as follows: +# +# a) The timezone UTC+5 is extinguished, with all the Acre state and the +# part of the Amazonas state that had this timezone now being put to the +# timezone UTC+4 +# b) The whole Pará state now is put at timezone UTC+3, instead of just +# part of it, as was before. +# +# This change follows a proposal of senator Tiao Viana of Acre state, that +# proposed it due to concerns about open television channels displaying +# programs inappropriate to youths in the states that had the timezone +# UTC+5 too early in the night. In the occasion, some more corrections +# were proposed, trying to unify the timezones of any given state. This +# change modifies timezone rules defined in decree 2.784 of 18 June, +# 1913. + +# From Rodrigo Severo (2008-06-24): +# Just correcting the URL: +# https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008 +# +# As a result of the above Decree I believe the America/Rio_Branco +# timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall +# be created to represent the...west side of the Pará State. I +# suggest this new timezone be called Santarem as the most +# important/populated city in the affected area. +# +# This new timezone would be the same as the Rio_Branco timezone up to +# the 2008/06/24 change which would be to UTC-3 instead of UTC-4. + +# From Alex Krivenyshev (2008-06-24): +# This is a quick reference page for New and Old Brazil Time Zones map. +# http://www.worldtimezone.com/brazil-time-new-old.php +# +# - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05 +# (state Acre and the part of the Amazonas will be UTC/GMT-04) - western +# part of Par state is moving to one timezone UTC-03 (from UTC-04). + +# From Paul Eggert (2002-10-10): +# The official decrees referenced below are mostly taken from +# Decretos sobre o Horário de Verão no Brasil. +# http://pcdsh01.on.br/DecHV.html + +# From Steffen Thorsen (2008-08-29): +# As announced by the government and many newspapers in Brazil late +# yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and +# it will end on 2009-02-15 (current rule for Brazil is fine). Based on +# past years experience with the elections, there was a good chance that +# the start was postponed to November, but it did not happen this year. +# +# It has not yet been posted to http://pcdsh01.on.br/DecHV.html +# +# An official page about it: +# http://www.mme.gov.br/site/news/detail.do?newsId=16722 +# Note that this link does not always work directly, but must be accessed +# by going to +# http://www.mme.gov.br/first +# +# One example link that works directly: +# http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54 +# (Portuguese) +# +# We have a written a short article about it as well: +# https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html +# +# From Alexander Krivenyshev (2011-10-04): +# State Bahia will return to Daylight savings time this year after 8 years off. +# The announcement was made by Governor Jaques Wagner in an interview to a +# television station in Salvador. + +# In Portuguese: +# http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html +# https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html + +# From Guilherme Bernardes Rodrigues (2011-10-07): +# There is news in the media, however there is still no decree about it. +# I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the +# official agency about time in Brazil, and she confirmed that the old rule is +# still in force. + +# From Guilherme Bernardes Rodrigues (2011-10-14) +# It's official, the President signed a decree that includes Bahia in summer +# time. +# [ and in a second message (same day): ] +# I found the decree. +# +# DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011 +# Link : +# http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6 + +# From Kelley Cook (2012-10-16): +# The governor of state of Bahia in Brazil announced on Thursday that +# due to public pressure, he is reversing the DST policy they implemented +# last year and will not be going to Summer Time on October 21st.... +# http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia + +# From Rodrigo Severo (2012-10-16): +# Tocantins state will have DST. +# https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html + +# From Steffen Thorsen (2013-09-20): +# Tocantins in Brazil is very likely not to observe DST from October.... +# http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto +# We will keep this article updated when this is confirmed: +# https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html + +# From Steffen Thorsen (2013-10-17): +# https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html +# Senator Jorge Viana announced that Acre will change time zone on November 10. +# He did not specify the time of the change, nor if western parts of Amazonas +# will change as well. +# +# From Paul Eggert (2013-10-17): +# For now, assume western Amazonas will change as well. + +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +# Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01) +# Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10) +Rule Brazil 1931 only - Oct 3 11:00 1:00 - +Rule Brazil 1932 1933 - Apr 1 0:00 0 - +Rule Brazil 1932 only - Oct 3 0:00 1:00 - +# Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10) +# revoked DST. +# Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24) +# Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13) +Rule Brazil 1949 1952 - Dec 1 0:00 1:00 - +Rule Brazil 1950 only - Apr 16 1:00 0 - +Rule Brazil 1951 1952 - Apr 1 0:00 0 - +# Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24) +Rule Brazil 1953 only - Mar 1 0:00 0 - +# Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30) +# revoked DST. +# Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18) +# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 +# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. +# Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03) +# extended the above decree to all of the national territory on 12-09. +Rule Brazil 1963 only - Dec 9 0:00 1:00 - +# Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25) +# extended summer time by one day to 1964-03-01 00:00 (start of school). +Rule Brazil 1964 only - Mar 1 0:00 0 - +# Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27) +Rule Brazil 1965 only - Jan 31 0:00 1:00 - +Rule Brazil 1965 only - Mar 31 0:00 0 - +# Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22) +Rule Brazil 1965 only - Dec 1 0:00 1:00 - +# Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18) +Rule Brazil 1966 1968 - Mar 1 0:00 0 - +Rule Brazil 1966 1967 - Nov 1 0:00 1:00 - +# Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15) +# revoked DST. +# Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27) +Rule Brazil 1985 only - Nov 2 0:00 1:00 - +# Decree 92,310 (1986-01-21) +# Decree 92,463 (1986-03-13) +Rule Brazil 1986 only - Mar 15 0:00 0 - +# Decree 93,316 (1986-10-01) +Rule Brazil 1986 only - Oct 25 0:00 1:00 - +Rule Brazil 1987 only - Feb 14 0:00 0 - +# Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22) +Rule Brazil 1987 only - Oct 25 0:00 1:00 - +Rule Brazil 1988 only - Feb 7 0:00 0 - +# Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12) +# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) +Rule Brazil 1988 only - Oct 16 0:00 1:00 - +Rule Brazil 1989 only - Jan 29 0:00 0 - +# Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21) +# with the same exceptions +Rule Brazil 1989 only - Oct 15 0:00 1:00 - +Rule Brazil 1990 only - Feb 11 0:00 0 - +# Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17) +# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. +# Decree 99,629 (1990-10-19) adds BA, MT. +Rule Brazil 1990 only - Oct 21 0:00 1:00 - +Rule Brazil 1991 only - Feb 17 0:00 0 - +# Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25) +# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. +Rule Brazil 1991 only - Oct 20 0:00 1:00 - +Rule Brazil 1992 only - Feb 9 0:00 0 - +# Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16) +# adopted by same states. +Rule Brazil 1992 only - Oct 25 0:00 1:00 - +Rule Brazil 1993 only - Jan 31 0:00 0 - +# Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28) +# adopted by same states, plus AM. +# Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22; +# web page corrected 2004-01-07) adopted by same states, minus AM. +# Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14) +# adopted by same states, plus MT and TO. +# Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13) +# adds AL, SE. +Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 - +Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - +Rule Brazil 1996 only - Feb 11 0:00 0 - +# Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04) +# adopted by same states, minus AL, SE. +Rule Brazil 1996 only - Oct 6 0:00 1:00 - +Rule Brazil 1997 only - Feb 16 0:00 0 - +# From Daniel C. Sobral (1998-02-12): +# In 1997, the DS began on October 6. The stated reason was that +# because international television networks ignored Brazil's policy on DS, +# they bought the wrong times on satellite for coverage of Pope's visit. +# This year, the ending date of DS was postponed to March 1 +# to help dealing with the shortages of electric power. +# +# Decree 2,317 (1997-09-04), adopted by same states. +Rule Brazil 1997 only - Oct 6 0:00 1:00 - +# Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG> +# (1998-02-10) +Rule Brazil 1998 only - Mar 1 0:00 0 - +# Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11) +# adopted by the same states as before. +Rule Brazil 1998 only - Oct 11 0:00 1:00 - +Rule Brazil 1999 only - Feb 21 0:00 0 - +# Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif> +# (1999-08-23) adopted by same states. +# Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30) +# adds SE, AL, PB, PE, RN, CE, PI, MA and RR. +Rule Brazil 1999 only - Oct 3 0:00 1:00 - +Rule Brazil 2000 only - Feb 27 0:00 0 - +# Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06) +# adopted by the same states as before. +# Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13) +# repeals DST in PE and RR, effective 2000-10-15 00:00. +# Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17) +# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. +# Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif> +# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE. +Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 - +Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 - +# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE. +# 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm> +Rule Brazil 2002 only - Nov 3 0:00 1:00 - +# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. +# 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm> +Rule Brazil 2003 only - Oct 19 0:00 1:00 - +# Decree 5,223 (2004-10-01) reestablishes DST in MT. +# 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm> +Rule Brazil 2004 only - Nov 2 0:00 1:00 - +# Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19), +# adopted by the same states as before. +Rule Brazil 2005 only - Oct 16 0:00 1:00 - +# Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03), +# adopted by the same states as before. +Rule Brazil 2006 only - Nov 5 0:00 1:00 - +Rule Brazil 2007 only - Feb 25 0:00 0 - +# Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26), +# adopted by the same states as before. +Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 - +# From Frederico A. C. Neves (2008-09-10): +# According to this decree +# http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm +# [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the +# 3rd Feb Sunday. There is an exception on the return date when this is +# the Carnival Sunday then the return date will be the next Sunday... +Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 - +Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - +# Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13) +# added Bahia. +Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - +# Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15) +# removed Bahia and added Tocantins. +# Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30) +# removed Tocantins. +Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - +Rule Brazil 2015 only - Feb Sun>=22 0:00 0 - +Rule Brazil 2016 2019 - Feb Sun>=15 0:00 0 - +# From Steffen Thorsen (2017-12-18): +# According to many media sources, next year's DST start in Brazil will move to +# the first Sunday of November +# ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html +# From Steffen Thorsen (2017-12-20): +# http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm +# From Fábio Gomes (2018-10-04): +# The Brazilian president just announced a new change on this year DST. +# It was scheduled to start on November 4th and it was changed to November 18th. +# From Rodrigo Brüning Wessler (2018-10-15): +# The Brazilian government just announced that the change in DST was +# canceled.... Maybe the president Michel Temer also woke up one hour +# earlier today. :) +Rule Brazil 2018 only - Nov Sun>=1 0:00 1:00 - +# The last ruleset listed above says that the following states observed DST: +# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. +# +# From Steffen Thorsen (2019-04-05): +# According to multiple sources the Brazilian president wants to get rid of DST. +# https://gmconline.com.br/noticias/politica/bolsonaro-horario-de-verao-deve-acabar-este-ano +# https://g1.globo.com/economia/noticia/2019/04/05/governo-anuncia-fim-do-horario-de-verao.ghtml +# From Marcus Diniz (2019-04-25): +# Brazil no longer has DST changes - decree signed today +# https://g1.globo.com/politica/noticia/2019/04/25/bolsonaro-assina-decreto-que-acaba-com-o-horario-de-verao.ghtml +# From Daniel Soares de Oliveira (2019-04-26): +# http://www.planalto.gov.br/ccivil_03/_Ato2019-2022/2019/Decreto/D9772.htm + +# Zone NAME STDOFF RULES FORMAT [UNTIL] +# +# Fernando de Noronha (administratively part of PE) +Zone America/Noronha -2:09:40 - LMT 1914 + -2:00 Brazil -02/-01 1990 Sep 17 + -2:00 - -02 1999 Sep 30 + -2:00 Brazil -02/-01 2000 Oct 15 + -2:00 - -02 2001 Sep 13 + -2:00 Brazil -02/-01 2002 Oct 1 + -2:00 - -02 +# Other Atlantic islands have no permanent settlement. +# These include Trindade and Martim Vaz (administratively part of ES), +# Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE). +# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; +# it also included the Penedos. +# +# Amapá (AP), east Pará (PA) +# East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu. +# The division between east and west Pará is the river Xingu. +# In the north a very small part from the river Javary (now Jari I guess, +# the border with Amapá) to the Amazon, then to the Xingu. +Zone America/Belem -3:13:56 - LMT 1914 + -3:00 Brazil -03/-02 1988 Sep 12 + -3:00 - -03 +# +# west Pará (PA) +# West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém. +Zone America/Santarem -3:38:48 - LMT 1914 + -4:00 Brazil -04/-03 1988 Sep 12 + -4:00 - -04 2008 Jun 24 0:00 + -3:00 - -03 +# +# Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN), +# Paraíba (PB) +Zone America/Fortaleza -2:34:00 - LMT 1914 + -3:00 Brazil -03/-02 1990 Sep 17 + -3:00 - -03 1999 Sep 30 + -3:00 Brazil -03/-02 2000 Oct 22 + -3:00 - -03 2001 Sep 13 + -3:00 Brazil -03/-02 2002 Oct 1 + -3:00 - -03 +# +# Pernambuco (PE) (except Atlantic islands) +Zone America/Recife -2:19:36 - LMT 1914 + -3:00 Brazil -03/-02 1990 Sep 17 + -3:00 - -03 1999 Sep 30 + -3:00 Brazil -03/-02 2000 Oct 15 + -3:00 - -03 2001 Sep 13 + -3:00 Brazil -03/-02 2002 Oct 1 + -3:00 - -03 +# +# Tocantins (TO) +Zone America/Araguaina -3:12:48 - LMT 1914 + -3:00 Brazil -03/-02 1990 Sep 17 + -3:00 - -03 1995 Sep 14 + -3:00 Brazil -03/-02 2003 Sep 24 + -3:00 - -03 2012 Oct 21 + -3:00 Brazil -03/-02 2013 Sep + -3:00 - -03 +# +# Alagoas (AL), Sergipe (SE) +Zone America/Maceio -2:22:52 - LMT 1914 + -3:00 Brazil -03/-02 1990 Sep 17 + -3:00 - -03 1995 Oct 13 + -3:00 Brazil -03/-02 1996 Sep 4 + -3:00 - -03 1999 Sep 30 + -3:00 Brazil -03/-02 2000 Oct 22 + -3:00 - -03 2001 Sep 13 + -3:00 Brazil -03/-02 2002 Oct 1 + -3:00 - -03 +# +# Bahia (BA) +# There are too many Salvadors elsewhere, so use America/Bahia instead +# of America/Salvador. +Zone America/Bahia -2:34:04 - LMT 1914 + -3:00 Brazil -03/-02 2003 Sep 24 + -3:00 - -03 2011 Oct 16 + -3:00 Brazil -03/-02 2012 Oct 21 + -3:00 - -03 +# +# Goiás (GO), Distrito Federal (DF), Minas Gerais (MG), +# Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR), +# Santa Catarina (SC), Rio Grande do Sul (RS) +Zone America/Sao_Paulo -3:06:28 - LMT 1914 + -3:00 Brazil -03/-02 1963 Oct 23 0:00 + -3:00 1:00 -02 1964 + -3:00 Brazil -03/-02 +# +# Mato Grosso do Sul (MS) +Zone America/Campo_Grande -3:38:28 - LMT 1914 + -4:00 Brazil -04/-03 +# +# Mato Grosso (MT) +Zone America/Cuiaba -3:44:20 - LMT 1914 + -4:00 Brazil -04/-03 2003 Sep 24 + -4:00 - -04 2004 Oct 1 + -4:00 Brazil -04/-03 +# +# Rondônia (RO) +Zone America/Porto_Velho -4:15:36 - LMT 1914 + -4:00 Brazil -04/-03 1988 Sep 12 + -4:00 - -04 +# +# Roraima (RR) +Zone America/Boa_Vista -4:02:40 - LMT 1914 + -4:00 Brazil -04/-03 1988 Sep 12 + -4:00 - -04 1999 Sep 30 + -4:00 Brazil -04/-03 2000 Oct 15 + -4:00 - -04 +# +# east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto +# The great circle line from Tabatinga to Porto Acre divides +# east from west Amazonas. +Zone America/Manaus -4:00:04 - LMT 1914 + -4:00 Brazil -04/-03 1988 Sep 12 + -4:00 - -04 1993 Sep 28 + -4:00 Brazil -04/-03 1994 Sep 22 + -4:00 - -04 +# +# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, +# Eirunepé, Envira, Ipixuna +Zone America/Eirunepe -4:39:28 - LMT 1914 + -5:00 Brazil -05/-04 1988 Sep 12 + -5:00 - -05 1993 Sep 28 + -5:00 Brazil -05/-04 1994 Sep 22 + -5:00 - -05 2008 Jun 24 0:00 + -4:00 - -04 2013 Nov 10 + -5:00 - -05 +# +# Acre (AC) +Zone America/Rio_Branco -4:31:12 - LMT 1914 + -5:00 Brazil -05/-04 1988 Sep 12 + -5:00 - -05 2008 Jun 24 0:00 + -4:00 - -04 2013 Nov 10 + -5:00 - -05 + +# Chile + +# From Paul Eggert (2022-03-15): +# Shanks & Pottenger says America/Santiago introduced standard time in +# 1890 and rounds its UT offset to 70W40; guess that in practice this +# was the same offset as in 1916-1919. It also says Pacific/Easter +# standardized on 109W22 in 1890; assume this didn't change the clocks. +# +# Dates for America/Santiago from 1910 to 2004 are primarily from +# the following source, cited by Oscar van Vlijmen (2006-10-08): +# [1] Chile Law +# http://www.webexhibits.org/daylightsaving/chile.html +# This contains a copy of this official table: +# Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30) +# https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm +# [1] needs several corrections, though. +# +# The first set of corrections is from: +# [2] History of the Official Time of Chile +# http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See: +# https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html +# This is an English translation of: +# Historia de la hora oficial de Chile (retrieved 2012-10-24). See: +# https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm +# A fancier Spanish version (requiring mouse-clicking) is at: +# http://www.horaoficial.cl/historia_hora.php +# Conflicts between [1] and [2] were resolved as follows: +# +# - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites +# Boletín No. 1, Aviso No. 1 (1910). Go with [2]. +# +# - [1] says SMT was -4:42:45, [2] says Chile's official time from +# 1916 to 1919 was -4:42:46.3, the meridian of Chile's National +# Astronomical Observatory (OAN), then located in what is now +# Quinta Normal in Santiago. Go with [1], as this matches the meridian +# referred to by the relevant Chilean laws to this day. +# +# - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites +# Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2]. +# +# - [1] does not give times for transitions; assume they occur +# at midnight mainland time, the current common practice. However, +# go with [2]'s specification of 23:00 for the 1947-05-21 transition. +# +# Another correction to [1] is from Jesper Nørgaard Welen, who +# wrote (2006-10-08), "I think that there are some obvious mistakes in +# the suggested link from Oscar van Vlijmen,... for instance entry 66 +# says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at +# 1990-09-15 (they should have been 1990-09-15 and 1990-09-16 +# respectively), but anyhow it clears up some doubts too." +# +# Data for Pacific/Easter from 1910 through 1967 come from Shanks & +# Pottenger. After that, for lack of better info assume +# Pacific/Easter is always two hours behind America/Santiago; +# this is known to work for DST transitions starting in 2008 and +# may well be true for earlier transitions. + +# From Tim Parenti (2022-07-06): +# For a brief period of roughly six weeks in 1946, DST was only observed on an +# emergency basis in specific regions of central Chile; namely, "the national +# territory between the provinces of Coquimbo and Concepción, inclusive". +# This was enacted by Decree 3,891, dated 1946-07-13, and took effect +# 1946-07-14 24:00, advancing these central regions to -03. +# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460715/#page/1 +# The decree contemplated "[t]hat this advancement of the Official Time, even +# though it has been proposed for the cities of Santiago and Valparaíso only, +# must be agreed with that of other cities, due to the connection of various +# activities that require it, such as, for example, the operation of rail +# services". It was originally set to expire after 30 days but was extended +# through 1946-08-31 by Decree 4,506, dated 1946-08-13. +# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460814/#page/1 +# +# Law Number 8,522, promulgated 1946-08-27, reunified Chilean clocks at their +# new "Summer Time" of -04, reckoned as that of "the meridian of the +# Astronomical Observatory of Lo Espejo, advanced by 42 minutes and 45 +# seconds". Although this law specified the new Summer Time to start on 1 +# September each year, a special "transitional article" started it a few days +# early, as soon as the law took effect. As the law was to take force "from +# the date of its publication in the 'Diario Oficial', which happened the +# following day, presume the change took place in Santiago and its environs +# from 24:00 -03 to 23:00 -04 on Wednesday 1946-08-28. Although this was a +# no-op for wall clocks in the north and south of the country, put their formal +# start to DST an hour later when they reached 24:00 -04. +# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460828/#page/1 +# After a brief "Winter Time" stint at -05 beginning 1947-04-01, Law Number +# 8,777, promulgated 1947-05-17, established year-round -04 "from 23:00 on the +# second day after it is published in the 'Diario Oficial'." It was published +# on Monday 1947-05-19 and so took effect from Wednesday 1947-05-21 23:00. +# https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19470519/#page/1 + +# From Eduardo Krell (1995-10-19): +# The law says to switch to DST at midnight [24:00] on the second SATURDAY +# of October.... The law is the same for March and October. +# (1998-09-29): +# Because of the drought this year, the government decided to go into +# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... +# (unless there's another dry season next year, I guess). + +# From Julio I. Pacheco Troncoso (1999-03-18): +# Because of the same drought, the government decided to end DST later, +# on April 3, (one-time change). + +# From Germán Poo-Caamaño (2008-03-03): +# Due to drought, Chile extends Daylight Time in three weeks. This +# is one-time change (Saturday 3/29 at 24:00 for America/Santiago +# and Saturday 3/29 at 22:00 for Pacific/Easter) +# The Supreme Decree is located at +# http://www.shoa.cl/servicios/supremo316.pdf +# +# From José Miguel Garrido (2008-03-05): +# http://www.shoa.cl/noticias/2008/04hora/hora.htm + +# From Angel Chiang (2010-03-04): +# Subject: DST in Chile exceptionally extended to 3 April due to earthquake +# http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098 +# +# From Arthur David Olson (2010-03-06): +# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch. + +# From Glenn Eychaner (2011-03-28): +# http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E} +# In English: +# Chile's clocks will go back an hour this year on the 7th of May instead +# of this Saturday. They will go forward again the 3rd Saturday in +# August, not in October as they have since 1968. + +# From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23): +# As stated in the website of the Chilean Energy Ministry +# http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html +# The Chilean Government has decided to postpone the entrance into winter time +# (to leave DST) from March 11 2012 to April 28th 2012.... +# Quote from the website communication: +# +# 6. For the year 2012, the dates of entry into winter time will be as follows: +# a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at +# 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00 +# of the same day. +# b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is, +# at 23:59:59, instead of passing to 0:00, the time should be adjusted to be +# 01:00 on September 2. + +# From Steffen Thorsen (2013-02-15): +# According to several news sources, Chile has extended DST this year, +# they will end DST later and start DST earlier than planned. They +# hope to save energy. The new end date is 2013-04-28 00:00 and new +# start date is 2013-09-08 00:00.... +# http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm + +# From José Miguel Garrido (2014-02-19): +# Today appeared in the Diario Oficial a decree amending the time change +# dates to 2014. +# DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC) +# DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC) +# http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf + +# From Eduardo Romero Urra (2015-03-03): +# Today has been published officially that Chile will use the DST time +# permanently until March 25 of 2017 +# http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg +# +# From Paul Eggert (2015-03-03): +# For now, assume that the extension will persist indefinitely. + +# From Juan Correa (2016-03-18): +# The decree regarding DST has been published in today's Official Gazette: +# http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/ +# http://www.leychile.cl/Navegar?idNorma=1088502 +# It does consider the second Saturday of May and August as the dates +# for the transition; and it lists DST dates until 2019, but I think +# this scheme will stick. +# +# From Paul Eggert (2016-03-18): +# For now, assume the pattern holds for the indefinite future. +# The decree says transitions occur at 24:00; in practice this appears +# to mean 24:00 mainland time, not 24:00 local time, so that Easter +# Island is always two hours behind the mainland. + +# From Juan Correa (2016-12-04): +# Magallanes region ... will keep DST (UTC -3) all year round.... +# 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 +# From Deborah Goldsmith (2017-01-19): +# http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf + +# From Juan Correa (2018-08-13): +# As of moments ago, the Ministry of Energy in Chile has announced the new +# schema for DST. ... Announcement in video (in Spanish): +# https://twitter.com/MinEnergia/status/1029000399129374720 +# From Yonathan Dossow (2018-08-13): +# The video says "first Saturday of September", we all know it means Sunday at +# midnight. +# From Tim Parenti (2018-08-13): +# Translating the captions on the video at 0:44-0:55, "We want to announce as +# Government that from 2019, Winter Time will be increased to 5 months, between +# the first Saturday of April and the first Saturday of September." +# At 2:08-2:20, "The Magallanes region will maintain its current time, as +# decided by the citizens during 2017, but our Government will promote a +# regional dialogue table to gather their opinion on this matter." +# https://twitter.com/MinEnergia/status/1029009354001973248 +# "We will keep the new time policy unchanged for at least the next 4 years." +# So we extend the new rules on Saturdays at 24:00 mainland time indefinitely. +# From Juan Correa (2019-02-04): +# http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/1498738.pdf + +# From Juan Correa (2022-04-02): +# I found there was a decree published last Thursday that will keep +# Magallanes region to UTC -3 "indefinitely". The decree is available at +# https://www.diariooficial.interior.gob.cl/publicaciones/2022/03/31/43217-B/01/2108910.pdf + +# From Juan Correa (2022-08-09): +# the Internal Affairs Ministry (Ministerio del Interior) informed DST +# for America/Santiago will start on midnight of September 11th; +# and will end on April 1st, 2023. Magallanes region (America/Punta_Arenas) +# will keep UTC -3 "indefinitely"... This is because on September 4th +# we will have a voting whether to approve a new Constitution. +# +# From Eduardo Romero Urra (2022-08-17): +# https://www.diariooficial.interior.gob.cl/publicaciones/2022/08/13/43327/01/2172567.pdf +# +# From Paul Eggert (2022-08-17): +# Although the presidential decree stops at fall 2026, assume that +# similar DST rules will continue thereafter. + +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule Chile 1927 1931 - Sep 1 0:00 1:00 - +Rule Chile 1928 1932 - Apr 1 0:00 0 - +Rule Chile 1968 only - Nov 3 4:00u 1:00 - +Rule Chile 1969 only - Mar 30 3:00u 0 - +Rule Chile 1969 only - Nov 23 4:00u 1:00 - +Rule Chile 1970 only - Mar 29 3:00u 0 - +Rule Chile 1971 only - Mar 14 3:00u 0 - +Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 - +Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - +Rule Chile 1973 only - Sep 30 4:00u 1:00 - +Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 - +Rule Chile 1987 only - Apr 12 3:00u 0 - +Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 - +Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 - +Rule Chile 1990 only - Sep 16 4:00u 1:00 - +Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - +Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 - +Rule Chile 1997 only - Mar 30 3:00u 0 - +Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - +Rule Chile 1998 only - Sep 27 4:00u 1:00 - +Rule Chile 1999 only - Apr 4 3:00u 0 - +Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 - +Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 - +# N.B.: the end of March 29 in Chile is March 30 in Universal time, +# which is used below in specifying the transition. +Rule Chile 2008 only - Mar 30 3:00u 0 - +Rule Chile 2009 only - Mar Sun>=9 3:00u 0 - +Rule Chile 2010 only - Apr Sun>=1 3:00u 0 - +Rule Chile 2011 only - May Sun>=2 3:00u 0 - +Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 - +Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 - +Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 - +Rule Chile 2016 2018 - May Sun>=9 3:00u 0 - +Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 - +Rule Chile 2019 max - Apr Sun>=2 3:00u 0 - +Rule Chile 2019 2021 - Sep Sun>=2 4:00u 1:00 - +Rule Chile 2022 only - Sep Sun>=9 4:00u 1:00 - +Rule Chile 2023 max - Sep Sun>=2 4:00u 1:00 - +# IATA SSIM anomalies: (1992-02) says 1992-03-14; +# (1996-09) says 1998-03-08. Ignore these. +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/Santiago -4:42:45 - LMT 1890 + -4:42:45 - SMT 1910 Jan 10 # Santiago Mean Time + -5:00 - -05 1916 Jul 1 + -4:42:45 - SMT 1918 Sep 10 + -4:00 - -04 1919 Jul 1 + -4:42:45 - SMT 1927 Sep 1 + -5:00 Chile -05/-04 1932 Sep 1 + -4:00 - -04 1942 Jun 1 + -5:00 - -05 1942 Aug 1 + -4:00 - -04 1946 Jul 14 24:00 + -4:00 1:00 -03 1946 Aug 28 24:00 # central CL + -5:00 1:00 -04 1947 Mar 31 24:00 + -5:00 - -05 1947 May 21 23:00 + -4:00 Chile -04/-03 +Zone America/Punta_Arenas -4:43:40 - LMT 1890 + -4:42:45 - SMT 1910 Jan 10 + -5:00 - -05 1916 Jul 1 + -4:42:45 - SMT 1918 Sep 10 + -4:00 - -04 1919 Jul 1 + -4:42:45 - SMT 1927 Sep 1 + -5:00 Chile -05/-04 1932 Sep 1 + -4:00 - -04 1942 Jun 1 + -5:00 - -05 1942 Aug 1 + -4:00 - -04 1946 Aug 28 24:00 + -5:00 1:00 -04 1947 Mar 31 24:00 + -5:00 - -05 1947 May 21 23:00 + -4:00 Chile -04/-03 2016 Dec 4 + -3:00 - -03 +Zone Pacific/Easter -7:17:28 - LMT 1890 + -7:17:28 - EMT 1932 Sep # Easter Mean Time + -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time + -6:00 Chile -06/-05 +# +# Salas y Gómez Island is uninhabited. +# Other Chilean locations, including Juan Fernández Is, Desventuradas Is, +# and Antarctic bases, are like America/Santiago. + +# Antarctic base using South American rules +# (See the file 'antarctica' for more.) +# +# Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) +# +# From Ethan Dicks (1996-10-06): +# It keeps the same time as Punta Arenas, Chile, because, just like us +# and the South Pole, that's the other end of their supply line.... +# I verified with someone who was there that since 1980, +# Palmer has followed Chile. Prior to that, before the Falklands War, +# Palmer used to be supplied from Argentina. +# +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone Antarctica/Palmer 0 - -00 1965 + -4:00 Arg -04/-03 1969 Oct 5 + -3:00 Arg -03/-02 1982 May + -4:00 Chile -04/-03 2016 Dec 4 + -3:00 - -03 + +# Colombia + +# Milne gives 4:56:16.4 for Bogotá time in 1899. He writes, +# "A variation of fifteen minutes in the public clocks of Bogota is not rare." + +# From Alois Treindl (2022-11-10): +# End of time change in Colombia 1993 ... should be 6 February 24h ... +# DECRETO 267 DE 1993 +# https://www.suin-juriscol.gov.co/viewDocument.asp?ruta=Decretos/1061335 + +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule CO 1992 only - May 3 0:00 1:00 - +Rule CO 1993 only - Feb 6 24:00 0 - +# Zone NAME STDOFF RULES FORMAT [UNTIL] + #STDOFF -4:56:16.4 +Zone America/Bogota -4:56:16 - LMT 1884 Mar 13 + -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time + -5:00 CO -05/-04 +# Malpelo, Providencia, San Andres +# no information; probably like America/Bogota + + +# Ecuador +# +# Milne says the Central and South American Telegraph Company used -5:24:15. +# +# From Alois Treindl (2016-12-15): +# https://www.elcomercio.com/actualidad/hora-sixto-1993.html +# ... Whether the law applied also to Galápagos, I do not know. +# From Paul Eggert (2016-12-15): +# https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html +# This says President Sixto Durán Ballén signed decree No. 285, which +# established DST from 1992-11-28 to 1993-02-05; it does not give transition +# times. The people called it "hora de Sixto" ("Sixto hour"). The change did +# not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics +# that included "Amanecía en mitad de la noche, los guaguas iban a clase sin +# sol" ("It was dawning in the middle of the night, the buses went to class +# without sun"). Although Ballén's campaign slogan was "Ni un paso atrás" +# (Not one step back), the clocks went back in 1993 and the experiment was not +# repeated. For now, assume transitions were at 00:00 local time country-wide. +# +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule Ecuador 1992 only - Nov 28 0:00 1:00 - +Rule Ecuador 1993 only - Feb 5 0:00 0 - +# +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/Guayaquil -5:19:20 - LMT 1890 + -5:14:00 - QMT 1931 # Quito Mean Time + -5:00 Ecuador -05/-04 +Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno + -5:00 - -05 1986 + -6:00 Ecuador -06/-05 + +# Falklands + +# From Paul Eggert (2006-03-22): +# Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except +# the IATA gives 1996-09-08. Go with Shanks & Pottenger. + +# From Falkland Islands Government Office, London (2001-01-22) +# via Jesper Nørgaard: +# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15 +# April 2001 and advance one hour to summer time at 2 am on Sunday 2 +# September. It is anticipated that the clocks will revert back at 2 +# am on Sunday 21 April 2002 and advance to summer time at 2 am on +# Sunday 1 September. + +# From Rives McDow (2001-02-13): +# +# I have communicated several times with people there, and the last +# time I had communications that was helpful was in 1998. Here is +# what was said then: +# +# "The general rule was that Stanley used daylight saving and the Camp +# did not. However for various reasons many people in the Camp have +# started to use daylight saving (known locally as 'Stanley Time') +# There is no rule as to who uses daylight saving - it is a matter of +# personal choice and so it is impossible to draw a map showing who +# uses it and who does not. Any list would be out of date as soon as +# it was produced. This year daylight saving ended on April 18/19th +# and started again on September 12/13th. I do not know what the rule +# is, but can find out if you like. We do not change at the same time +# as UK or Chile." +# +# I did have in my notes that the rule was "Second Saturday in Sep at +# 0:00 until third Saturday in Apr at 0:00". I think that this does +# not agree in some cases with Shanks; is this true? +# +# Also, there is no mention in the list that some areas in the +# Falklands do not use DST. I have found in my communications there +# that these areas are on the western half of East Falkland and all of +# West Falkland. Stanley is the only place that consistently observes +# DST. Again, as in other places in the world, the farmers don't like +# it. West Falkland is almost entirely sheep farmers. +# +# I know one lady there that keeps a list of which farm keeps DST and +# which doesn't each year. She runs a shop in Stanley, and says that +# the list changes each year. She uses it to communicate to her +# customers, catching them when they are home for lunch or dinner. + +# From Paul Eggert (2001-03-05): +# For now, we'll just record the time in Stanley, since we have no +# better info. + +# From Steffen Thorsen (2011-04-01): +# The Falkland Islands will not turn back clocks this winter, but stay on +# daylight saving time. +# +# One source: +# http://www.falklandnews.com/public/story.cfm?get=5914&source=3 +# +# We have gotten this confirmed by a clerk of the legislative assembly: +# Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the +# third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3 +# hours) on the first Sunday of September at 0200hrs. +# +# IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands +# will not revert to local mean time, but clocks will remain on Summer +# time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term +# change to local time following the trial period will be notified. +# +# From Andrew Newman (2012-02-24) +# A letter from Justin McPhee, Chief Executive, +# Cable & Wireless Falkland Islands (dated 2012-02-22) +# states... +# The current Atlantic/Stanley entry under South America expects the +# clocks to go back to standard Falklands Time (FKT) on the 15th April. +# The database entry states that in 2011 Stanley was staying on fixed +# summer time on a trial basis only. FIG need to contact IANA and/or +# the maintainers of the database to inform them we're adopting +# the same policy this year and suggest recommendations for future years. +# +# For now we will assume permanent -03 for the Falklands +# until advised differently (to apply for 2012 and beyond, after the 2011 +# experiment was apparently successful.) +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 - +Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - +Rule Falk 1939 only - Oct 1 0:00 1:00 - +Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 - +Rule Falk 1943 only - Jan 1 0:00 0 - +Rule Falk 1983 only - Sep lastSun 0:00 1:00 - +Rule Falk 1984 1985 - Apr lastSun 0:00 0 - +Rule Falk 1984 only - Sep 16 0:00 1:00 - +Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 - +Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 - +Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 - +Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 - +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone Atlantic/Stanley -3:51:24 - LMT 1890 + -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time + -4:00 Falk -04/-03 1983 May + -3:00 Falk -03/-02 1985 Sep 15 + -4:00 Falk -04/-03 2010 Sep 5 2:00 + -3:00 - -03 + +# French Guiana +# For the 1911/1912 establishment of standard time in French possessions, see: +# Société Française de Physique, Recueil de constantes physiques (1913), +# page 752, 18b. +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1 + -4:00 - -04 1967 Oct + -3:00 - -03 + +# Guyana + +# From P Chan (2020-11-27): +# https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547 +# The Official Gazette of British Guiana. (New Series.) Vol. XL. July to +# December, 1915, p 1547, lists as several notes: +# "Local Mean Time 3 hours 52 mins. 39 secs. slow of Greenwich Mean Time +# (Georgetown.) From 1st August, 1911, British Guiana Standard Mean Time 4 +# hours slow of Greenwich Mean Time, by notice in Official Gazette on 1st July, +# 1911. From 1st March, 1915, British Guiana Standard Mean Time 3 hours 45 +# mins. 0 secs. slow of Greenwich Mean Time, by notice in Official Gazette on +# 23rd January, 1915." +# +# https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpretation_and_general_clauses_(amendment)_act_1975.pdf +# Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975) +# [dated 1975-07-31] +# "This Act...shall come into operation on 1st August, 1975." +# "...where any expression of time occurs...the time referred to shall signify +# the standard time of Guyana which shall be three hours behind Greenwich Mean +# Time." +# +# Circular No. 10/1992 dated 1992-03-20 +# https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf +# "...cabinet has decided that with effect from Sunday 29th March, 1992, Guyana +# Standard Time would be re-established at 01:00 hours by adjusting the hands +# of the clock back to 24:00 hours." +# Legislated in the Interpretation and general clauses (Amendment) Act 1992 +# (Act No. 6 of 1992) [passed 1992-03-27, published 1992-04-18] +# https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_general_clauses_(amendment)_act_1992.pdf + +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/Guyana -3:52:39 - LMT 1911 Aug 1 # Georgetown + -4:00 - -04 1915 Mar 1 + -3:45 - -0345 1975 Aug 1 + -3:00 - -03 1992 Mar 29 1:00 + -4:00 - -04 + +# Paraguay +# +# From Paul Eggert (2006-03-22): +# Shanks & Pottenger say that spring transitions are 01:00 -> 02:00, +# and autumn transitions are 00:00 -> 23:00. Go with pre-1999 +# editions of Shanks, and with the IATA, who say transitions occur at 00:00. +# +# From Waldemar Villamayor-Venialbo (2013-09-20): +# No time of the day is established for the adjustment, so people normally +# adjust their clocks at 0 hour of the given dates. +# +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule Para 1975 1988 - Oct 1 0:00 1:00 - +Rule Para 1975 1978 - Mar 1 0:00 0 - +Rule Para 1979 1991 - Apr 1 0:00 0 - +Rule Para 1989 only - Oct 22 0:00 1:00 - +Rule Para 1990 only - Oct 1 0:00 1:00 - +Rule Para 1991 only - Oct 6 0:00 1:00 - +Rule Para 1992 only - Mar 1 0:00 0 - +Rule Para 1992 only - Oct 5 0:00 1:00 - +Rule Para 1993 only - Mar 31 0:00 0 - +Rule Para 1993 1995 - Oct 1 0:00 1:00 - +Rule Para 1994 1995 - Feb lastSun 0:00 0 - +Rule Para 1996 only - Mar 1 0:00 0 - +# IATA SSIM (2000-02) says 1999-10-10; ignore this for now. +# From Steffen Thorsen (2000-10-02): +# I have three independent reports that Paraguay changed to DST this Sunday +# (10-01). +# +# Translated by Gwillim Law (2001-02-27) from +# Noticias, a daily paper in Asunción, Paraguay (2000-10-01): +# http://www.diarionoticias.com.py/011000/nacional/naciona1.htm +# Starting at 0:00 today, the clock will be set forward 60 minutes, in +# fulfillment of Decree No. 7,273 of the Executive Power.... The time change +# system has been operating for several years. Formerly there was a separate +# decree each year; the new law has the same effect, but permanently. Every +# year, the time will change on the first Sunday of October; likewise, the +# clock will be set back on the first Sunday of March. +# +Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 - +# IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger. +Rule Para 1997 only - Feb lastSun 0:00 0 - +# Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but +# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27). +Rule Para 1998 2001 - Mar Sun>=1 0:00 0 - +# From Rives McDow (2002-02-28): +# A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the +# dst method to be from the first Sunday in September to the first Sunday in +# April. +Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - +Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 - +# +# From Jesper Nørgaard Welen (2005-01-02): +# There are several sources that claim that Paraguay made +# a timezone rule change in autumn 2004. +# From Steffen Thorsen (2005-01-05): +# Decree 1,867 (2004-03-05) +# From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13) +# http://www.presidencia.gov.py/decretos/D1867.pdf +Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 - +Rule Para 2005 2009 - Mar Sun>=8 0:00 0 - +# From Carlos Raúl Perasso (2010-02-18): +# By decree number 3958 issued yesterday +# http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf +# Paraguay changes its DST schedule, postponing the March rule to April and +# modifying the October date. The decree reads: +# ... +# Art. 1. It is hereby established that from the second Sunday of the month of +# April of this year (2010), the official time is to be set back 60 minutes, +# and that on the first Sunday of the month of October, it is to be set +# forward 60 minutes, in all the territory of the Paraguayan Republic. +# ... +Rule Para 2010 max - Oct Sun>=1 0:00 1:00 - +Rule Para 2010 2012 - Apr Sun>=8 0:00 0 - +# +# From Steffen Thorsen (2013-03-07): +# Paraguay will end DST on 2013-03-24 00:00.... +# http://www.ande.gov.py/interna.php?id=1075 +# +# From Carlos Raúl Perasso (2013-03-15): +# The change in Paraguay is now final. Decree number 10780 +# http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf +# From Carlos Raúl Perasso (2014-02-28): +# Decree 1264 can be found at: +# http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf +# +# From Paul Eggert (2023-07-26): +# Transition dates are now set by Law No. 7115, not by presidential decree. +# https://www.abc.com.py/politica/2023/07/12/promulgacion-el-cambio-de-hora-sera-por-ley/ +# From Carlos Raúl Perasso (2023-07-27): +# http://silpy.congreso.gov.py/descarga/ley-144138 +Rule Para 2013 max - Mar Sun>=22 0:00 0 - + +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/Asuncion -3:50:40 - LMT 1890 + -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time + -4:00 - -04 1972 Oct + -3:00 - -03 1974 Apr + -4:00 Para -04/-03 + +# Peru +# +# From Evelyn C. Leeper via Mark Brader (2003-10-26) +# <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>: +# When we were in Peru in 1985-1986, they apparently switched over +# sometime between December 29 and January 3 while we were on the Amazon. +# +# From Paul Eggert (2006-03-22): +# Shanks & Pottenger don't have this transition. Assume 1986 was like 1987. + +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule Peru 1938 only - Jan 1 0:00 1:00 - +Rule Peru 1938 only - Apr 1 0:00 0 - +Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 - +Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - +Rule Peru 1986 1987 - Jan 1 0:00 1:00 - +Rule Peru 1986 1987 - Apr 1 0:00 0 - +Rule Peru 1990 only - Jan 1 0:00 1:00 - +Rule Peru 1990 only - Apr 1 0:00 0 - +# IATA is ambiguous for 1993/1995; go with Shanks & Pottenger. +Rule Peru 1994 only - Jan 1 0:00 1:00 - +Rule Peru 1994 only - Apr 1 0:00 0 - +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/Lima -5:08:12 - LMT 1890 + -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time? + -5:00 Peru -05/-04 + +# South Georgia +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken + -2:00 - -02 + +# South Sandwich Is +# uninhabited; scientific personnel have wintered + +# Suriname +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/Paramaribo -3:40:40 - LMT 1911 + -3:40:52 - PMT 1935 # Paramaribo Mean Time + -3:40:36 - PMT 1945 Oct # The capital moved? + -3:30 - -0330 1984 Oct + -3:00 - -03 + +# Uruguay +# From Paul Eggert (1993-11-18): +# Uruguay wins the prize for the strangest peacetime manipulation of the rules. +# +# From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael +# Deckers (2018-02-20): +# ... At least they kept good records... +# +# http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36 +# Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and +# Meteorology Service of the Uruguayan Navy, seems to give many transitions +# with greater clarity than we've had before. It directly references many laws +# and decrees which are, in turn, referenced below. They can be viewed in the +# public archives of the Diario Oficial (in Spanish) at +# http://www.impo.com.uy/diariooficial/ +# +# Ley No. 3920 of 1908-06-10 placed the determination of legal time under the +# auspices of the National Institute for the Prediction of Time. It is unclear +# exactly what offset was used during this period, though Ley No. 7200 of +# 1920-04-23 used the Observatory of the National Meteorological Institute in +# Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian, +# retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00, +# resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on +# page 725 of the Proceedings of the Second Pan-American Scientific Congress, +# 1915-1916) was in use, and merely became official from 1908-06-10. +# https://www.impo.com.uy/diariooficial/1908/06/18/12 +# https://www.impo.com.uy/diariooficial/1920/04/27/9 +# +# Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced +# by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14 +# minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the +# National Council of Administration the same day, published directly below the +# law in the Diario Oficial, specified the first transition to be 1923-09-30 +# 24:00. This effectively established standard time at UT-03:30 with 30 +# minutes DST. Assume transitions at 24:00 on the specified days until Ley No. +# 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other +# provisions which oppose" it, resulting in year-round UT-03:30; a Resolución +# of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it +# would have been under the previous law. +# https://www.impo.com.uy/diariooficial/1923/07/02/2 +# https://www.impo.com.uy/diariooficial/1926/03/10/2 +# https://www.impo.com.uy/diariooficial/1926/03/18/2 +# +# Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 - +Rule Uruguay 1924 1926 - Apr 1 0:00 0 - +# From Tim Parenti (2018-02-15): +# http://www.impo.com.uy/diariooficial/1933/10/27/6 +# +# It appears Ley No. 9122 of 1933 was never published as such in the Diario +# Oficial, but instead appeared as Document 26 in the Diario on Friday +# 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of +# National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the +# last Sunday of October...until the last Saturday of March." In accordance +# with this provision, the first transition was explicitly specified in Article +# 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29 +# at 00:00. Assume transitions at 00:00 Sunday throughout. +# +# Departing from the matter-of-fact nature of previous timekeeping laws, the +# 1933 decree "consider[s] the advantages of...the advance of legal time": +# +# "Whereas: The measure adopted by almost all nations at the time of the last +# World War still persists in North America and Europe, precisely because of +# the economic, hygienic, and social advantages derived from such an +# emergency measure... +# +# Whereas: The advance of the legal time during the summer seasons, by +# displacing social activity near sunrise, favors the citizen populations +# and especially the society that creates and works..." +# +# It further specified that "necessary measures" be taken to ensure that +# "public spectacles finish, in general, before [01:00]." +Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 - +Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 - +# From Tim Parenti (2018-02-15): +# Most of the Rules below, and their contemporaneous Zone lines, have been +# updated simply to match the Almanaque 2018. Although the document does not +# list exact transition times, midnight transitions were already present in our +# data here for all transitions through 2004-09, and this is both consistent +# with prior transitions and verified in several decrees marked below between +# 1939-09 and 2004-09, wherein the relevant text was typically of the form: +# +# "From 0 hours on [date], the legal time of the entire Republic will be... +# +# In accordance with [the preceding], on [previous date] at 24 hours, all +# clocks throughout the Republic will be [advanced/retarded] by..." +# +# It is possible that there is greater specificity to be found for the Rules +# below, but it is buried in no fewer than 40 different decrees individually +# referenced by the Almanaque for the period from 1939-09 to 2014-09. +# Four-fifths of these were promulgated less than two weeks before taking +# effect; more than half within a week and none more than 5 weeks. Only the +# handful with comments below have been checked with any thoroughness. +Rule Uruguay 1939 only - Oct 1 0:00 0:30 - +Rule Uruguay 1940 only - Oct 27 0:00 0:30 - +# From Tim Parenti (2018-02-15): +# Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified +# UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel". +# http://www.impo.com.uy/diariooficial/1941/08/04/1 +Rule Uruguay 1941 only - Aug 1 0:00 0:30 - +# From Tim Parenti (2018-02-15): +# Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified +# further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks +# never went back to UT-03:30 thereafter, this is modeled as advancing standard +# time by 30 minutes to UT-03, while retaining 30 minutes of DST. +# http://www.impo.com.uy/diariooficial/1942/12/16/3 +Rule Uruguay 1942 only - Dec 14 0:00 0:30 - +Rule Uruguay 1943 only - Mar 14 0:00 0 - +Rule Uruguay 1959 only - May 24 0:00 0:30 - +Rule Uruguay 1959 only - Nov 15 0:00 0 - +Rule Uruguay 1960 only - Jan 17 0:00 1:00 - +Rule Uruguay 1960 only - Mar 6 0:00 0 - +Rule Uruguay 1965 only - Apr 4 0:00 1:00 - +Rule Uruguay 1965 only - Sep 26 0:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the +# day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00. +# http://www.impo.com.uy/diariooficial/1968/05/30/5 +Rule Uruguay 1968 only - May 27 0:00 0:30 - +Rule Uruguay 1968 only - Dec 1 0:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 188/970 of 1970-04-23 instituted restrictions on electricity +# consumption "as a consequence of the current rainfall regime in the country". +# Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00. +# http://www.impo.com.uy/diariooficial/1970/04/29/4 +Rule Uruguay 1970 only - Apr 25 0:00 1:00 - +Rule Uruguay 1970 only - Jun 14 0:00 0 - +Rule Uruguay 1972 only - Apr 23 0:00 1:00 - +Rule Uruguay 1972 only - Jul 16 0:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 29/974 of 1974-01-11, citing "the international rise in the price of +# oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of +# 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30 +# minutes followed in Decreto 679/974 of 1974-08-29. +# http://www.impo.com.uy/diariooficial/1974/01/22/11 +# http://www.impo.com.uy/diariooficial/1974/03/14/3 +# http://www.impo.com.uy/diariooficial/1974/09/04/6 +Rule Uruguay 1974 only - Jan 13 0:00 1:30 - +Rule Uruguay 1974 only - Mar 10 0:00 0:30 - +Rule Uruguay 1974 only - Sep 1 0:00 0 - +Rule Uruguay 1974 only - Dec 22 0:00 1:00 - +Rule Uruguay 1975 only - Mar 30 0:00 0 - +Rule Uruguay 1976 only - Dec 19 0:00 1:00 - +Rule Uruguay 1977 only - Mar 6 0:00 0 - +Rule Uruguay 1977 only - Dec 4 0:00 1:00 - +Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 - +Rule Uruguay 1978 only - Dec 17 0:00 1:00 - +Rule Uruguay 1979 only - Apr 29 0:00 1:00 - +Rule Uruguay 1980 only - Mar 16 0:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 725/987 of 1987-12-04 cited "better use of national tourist +# attractions" to advance clocks one hour from Monday 1987-12-14 00:00. +# http://www.impo.com.uy/diariooficial/1988/01/25/1 +Rule Uruguay 1987 only - Dec 14 0:00 1:00 - +Rule Uruguay 1988 only - Feb 28 0:00 0 - +Rule Uruguay 1988 only - Dec 11 0:00 1:00 - +Rule Uruguay 1989 only - Mar 5 0:00 0 - +Rule Uruguay 1989 only - Oct 29 0:00 1:00 - +Rule Uruguay 1990 only - Feb 25 0:00 0 - +# From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04): +# IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the +# 1992/1993 season appears to be the first in over half a century where DST +# both began and ended pursuant to the same decree. +Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 - +Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 - +Rule Uruguay 1992 only - Oct 18 0:00 1:00 - +Rule Uruguay 1993 only - Feb 28 0:00 0 - +# From Eduardo Cota (2004-09-20): +# The Uruguayan government has decreed a change in the local time.... +# From Tim Parenti (2018-02-15): +# Decreto 328/004 of 2004-09-15. +# http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1 +Rule Uruguay 2004 only - Sep 19 0:00 1:00 - +# From Steffen Thorsen (2005-03-11): +# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to +# save energy ... it was postponed two weeks.... +# From Tim Parenti (2018-02-15): +# This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous +# reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending +# Decreto 328/004: +# http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1 +# The original decree specified a transition of 2005-03-12 24:00, but the new +# one specified 2005-03-27 02:00. +Rule Uruguay 2005 only - Mar 27 2:00 0 - +# From Eduardo Cota (2005-09-27): +# ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time, +# official time in Uruguay will be at GMT -2. +# From Tim Parenti (2018-02-15): +# Decreto 318/005 of 2005-09-19. +# http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1 +Rule Uruguay 2005 only - Oct 9 2:00 1:00 - +Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 - +# From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06): +# Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday +# of October at 02:00 through the second Sunday of March at 02:00. Almanaque +# 2018 appears to have a few typoed dates through this period; ignore them. +# http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1 +Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - +# From Steffen Thorsen (2015-06-30): +# ... it looks like they will not be using DST the coming summer: +# http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 +# http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/ +# From Paul Eggert (2015-06-30): +# Apparently restaurateurs complained that DST caused people to go to the beach +# instead of out to dinner. +# From Pablo Camargo (2015-07-13): +# http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf +# From Tim Parenti (2018-02-15): +# Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. + +# This Zone can be simplified once we assume zic %z. +Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10 + -3:44:51 - MMT 1920 May 1 # Montevideo MT + -4:00 - -04 1923 Oct 1 + -3:30 Uruguay -0330/-03 1942 Dec 14 + -3:00 Uruguay -03/-0230 1960 + -3:00 Uruguay -03/-02 1968 + -3:00 Uruguay -03/-0230 1970 + -3:00 Uruguay -03/-02 1974 + -3:00 Uruguay -03/-0130 1974 Mar 10 + -3:00 Uruguay -03/-0230 1974 Dec 22 + -3:00 Uruguay -03/-02 + +# Venezuela +# +# From Paul Eggert (2015-07-28): +# For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533 +# http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf +# +# From John Stainforth (2007-11-28): +# ... the change for Venezuela originally expected for 2007-12-31 has +# been brought forward to 2007-12-09. The official announcement was +# published today in the "Gaceta Oficial de la República Bolivariana +# de Venezuela, número 38.819" (official document for all laws or +# resolution publication) +# http://www.globovision.com/news.php?nid=72208 + +# From Alexander Krivenyshev (2016-04-15): +# https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino +# +# From Paul Eggert (2016-04-15): +# Clocks advance 30 minutes on 2016-05-01 at 02:30.... +# "'Venezuela's new time-zone: hours without light, hours without water, +# hours of presidential broadcasts, hours of lines,' quipped comedian +# Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps +# half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400 +# https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE +# +# From Matt Johnson (2016-04-20): +# ... published in the official Gazette [2016-04-18], here: +# http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf + +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone America/Caracas -4:27:44 - LMT 1890 + -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? + -4:30 - -0430 1965 Jan 1 0:00 + -4:00 - -04 2007 Dec 9 3:00 + -4:30 - -0430 2016 May 1 2:30 + -4:00 - -04 |