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# <pre> 
# @(#)southamerica      8.50 
# This file is in the public domain, so clarified as of 
# 2009-05-17 by Arthur David Olson. 
 
# This data is by no means authoritative; if you think you know better, 
# go ahead and edit the file (and please send any changes to 
# tz@elsie.nci.nih.gov for general use in the future). 
 
# From Paul Eggert (2006-03-22): 
# A good source for time zone historical data outside the U.S. is 
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 
# San Diego: ACS Publications, Inc. (2003). 
# 
# Gwillim Law writes that a good source 
# for recent time zone data is 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, Shanks & Pottenger is the source for 
# entries through 1990, and IATA SSIM is the source for entries afterwards. 
# 
# Earlier editions of these tables used the North American style (e.g. ARST and 
# ARDT for Argentine Standard and Daylight Time), but the following quote 
# suggests that it's better to use European style (e.g. ART and ARST). 
#       I suggest the use of _Summer time_ instead of the more cumbersome 
#       _daylight-saving time_.  _Summer time_ seems to be in general use 
#       in Europe and South America. 
#       -- E O Cutler, _New York Times_ (1937-02-14), quoted in 
#       H L Mencken, _The American Language: Supplement I_ (1960), p 466 
# 
# Earlier editions of these tables also used the North American style 
# for time zones in Brazil, but this was incorrect, as Brazilians say 
# "summer time".  Reinaldo Goulart, a Sao Paulo businessman active in 
# the railroad sector, writes (1999-07-06): 
#       The subject of time zones is currently a matter of discussion/debate in 
#       Brazil.  Let's say that "the Brasilia time" is considered the 
#       "official time" because Brasilia is the capital city. 
#       The other three time zones are called "Brasilia time "minus one" or 
#       "plus one" or "plus two".  As far as I know there is no such 
#       name/designation as "Eastern Time" or "Central Time". 
# So I invented the following (English-language) abbreviations for now. 
# Corrections are welcome! 
#               std     dst 
#       -2:00   FNT     FNST    Fernando de Noronha 
#       -3:00   BRT     BRST    Brasilia 
#       -4:00   AMT     AMST    Amazon 
#       -5:00   ACT     ACST    Acre 
 
############################################################################### 
 
############################################################################### 
 
# 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 (1988-01-199): 
# 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      TYPE    IN      ON      AT      SAVE    LETTER/S 
Rule    Arg     1930    only    -       Dec      1      0:00    1:00    S 
Rule    Arg     1931    only    -       Apr      1      0:00    0       - 
Rule    Arg     1931    only    -       Oct     15      0:00    1:00    S 
Rule    Arg     1932    1940    -       Mar      1      0:00    0       - 
Rule    Arg     1932    1939    -       Nov      1      0:00    1:00    S 
Rule    Arg     1940    only    -       Jul      1      0:00    1:00    S 
Rule    Arg     1941    only    -       Jun     15      0:00    0       - 
Rule    Arg     1941    only    -       Oct     15      0:00    1:00    S 
Rule    Arg     1943    only    -       Aug      1      0:00    0       - 
Rule    Arg     1943    only    -       Oct     15      0:00    1:00    S 
Rule    Arg     1946    only    -       Mar      1      0:00    0       - 
Rule    Arg     1946    only    -       Oct      1      0:00    1:00    S 
Rule    Arg     1963    only    -       Oct      1      0:00    0       - 
Rule    Arg     1963    only    -       Dec     15      0:00    1:00    S 
Rule    Arg     1964    1966    -       Mar      1      0:00    0       - 
Rule    Arg     1964    1966    -       Oct     15      0:00    1:00    S 
Rule    Arg     1967    only    -       Apr      2      0:00    0       - 
Rule    Arg     1967    1968    -       Oct     Sun>=1  0:00    1:00    S 
Rule    Arg     1968    1969    -       Apr     Sun>=1  0:00    0       - 
Rule    Arg     1974    only    -       Jan     23      0:00    1:00    S 
Rule    Arg     1974    only    -       May      1      0:00    0       - 
Rule    Arg     1988    only    -       Dec      1      0:00    1:00    S 
# 
# From Hernan G. Otero (1995-06-26): 
# These corrections were contributed by InterSoft Argentina S.A., 
# obtaining the data from the: 
# Talleres de Hidrografia 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    S 
# 
# 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    S 
# 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 Sao 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 Fabian L. Arce Jofre (2000-04-04): 
# The law that claimed DST for Argentina was derogated by President Fernando 
# de la Rua 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 Norgaard Welen (2007-12-26) 
# The last hurdle of Argentina DST is over, the proposal was approved in 
# the lower chamber too (Deputados) 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: 
# <a href="http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996"> 
# http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996 
# </a> 
# 
# 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. 
# 
# <a href="http://www.worldtimezone.com/dst_news/dst_news_argentina03.html"> 
# http://www.worldtimezone.com/dst_news/dst_news_argentina03.html 
# </a> 
# OR 
# <a href="http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)"> 
# http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish) 
# </a> 
 
# From Rodrigo Severo (2008-10-06): 
# Here is some info available at a Gentoo bug related to TZ on Argentina's DST: 
# ... 
# ------- Comment #1 from [jmdocile]  2008-10-06 16:28 0000 ------- 
# Hi, there is a problem with timezone-data-2008e and maybe with 
# timezone-data-2008f 
# Argentinian law [Number] 25.155 is no longer valid. 
# <a href="http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm"> 
# http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm 
# </a> 
# The new one is law [Number] 26.350 
# <a href="http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm"> 
# http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm 
# </a> 
# 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 
# <a href="http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01"> 
# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01 
# </a> 
# 
# 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, Neuquen, Rio Negro, Chubut, Santa Cruz 
# and Tierra del Fuego 
# <a href="http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01"> 
# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01 
# </a> 
# 
# 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) 
# <a href="http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc"> 
# http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc 
# </a> 
 
# From fullinet (2009-10-18): 
# As announced in 
# <a hef="http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356"> 
# http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356 
# </a> 
# (an official .gob.ar) under title: "Sin Cambio de Hora" (english: "No hour change") 
# 
# "Por el momento, el Gobierno Nacional resolvio no modificar la hora 
# oficial, decision que estaba en estudio para su implementacion el 
# domingo 18 de octubre. Desde el Ministerio de Planificacion se anuncio 
# que la Argentina hoy, en estas condiciones meteorologicas, no necesita 
# la modificacion del huso horario, ya que 2009 nos encuentra con 
# crecimiento en la produccion y distribucion energetica." 
 
Rule    Arg     2007    only    -       Dec     30      0:00    1:00    S 
Rule    Arg     2008    2009    -       Mar     Sun>=15 0:00    0       - 
Rule    Arg     2008    only    -       Oct     Sun>=15 0:00    1:00    S 
  
# 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 (2006-03-22): 
# <a href="http://www.spicasc.net/horvera.html"> 
# Hora de verano para la Republica Argentina (2003-06-08) 
# </a> 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. 
# 
# 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, Tucuman. 
# 
# From Mariano Absatz (2004-06-14): 
# ... this weekend, the Province of Tucuman 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 pais 
# (Argentine Province delayed clock and mark difference with the rest of the 
# country) 
# <a href="http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel"> 
# http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel 
# </a> 
# 
# Es inminente que en San Luis atrasen una hora los relojes 
# (It is imminent in San Luis clocks one hour delay) 
# <a href="http://www.lagaceta.com.ar/vernotae.asp?id_nota=253414"> 
# http://www.lagaceta.com.ar/vernotae.asp?id_nota=253414 
# </a> 
# 
# <a href="http://www.worldtimezone.net/dst_news/dst_news_argentina02.html"> 
# http://www.worldtimezone.net/dst_news/dst_news_argentina02.html 
# </a> 
 
# From Jesper Norgaard Welen (2008-01-18): 
# The page of the San Luis provincial government 
# <a href="http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812"> 
# http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812 
# </a> 
# 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 21.st 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 Norgaard 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 
# <a href="http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834"> 
# http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834 
# </a> 
# 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 (2008-06-30): 
# Unless otherwise specified, data 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 
# <a href="http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102"> 
# http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102 
# </a> 
# (I couldn't find the decree, but 
# <a href="http://www.sanluis.gov.ar"> 
# www.sanluis.gov.ar 
# <a/> 
# is the official page for the Province Government). 
# 
# There's also a note in only one of the major national papers (La Nación) at 
# <a href="http://www.lanacion.com.ar/nota.asp?nota_id=1107912"> 
# http://www.lanacion.com.ar/nota.asp?nota_id=1107912 
# </a> 
#  
# The press release says: 
#  (...) anunció que el próximo domingo a las 00:00 los puntanos deberán 
# atrasar una hora sus relojes. 
# 
# A partir de entonces, San Luis establecerá el huso horario propio de 
# la Provincia. De esta manera, durante el periodo del calendario anual 
# 2009, el cambio horario quedará comprendido entre las 00:00 del tercer 
# domingo de marzo y las 24:00 del segundo sábado de octubre. 
# Quick&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 
# <a href="http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276>" 
# http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276 
# </a> 
# 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... 
# 
# I'm enclosing a patch that does what I say... regretfully, the San Luis 
# timezone must be called "WART/WARST" even when most of the time (like, 
# right now) WARST == ART... that is, since last Sunday, all the country 
# is using UTC-3, but in my patch, San Luis calls it "WARST" and the rest 
# of the country calls it "ART". 
# ... 
 
# From Alexander Krivenyshev (2010-04-09): 
# According to news reports from El Diario de la Republica 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 pr&oacute;rroga del huso horario de verano (Spanish) 
# <a href="http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9"> 
# http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9 
# </a> 
# or (some English translation): 
# <a href="http://www.worldtimezone.com/dst_news/dst_news_argentina08.html"> 
# http://www.worldtimezone.com/dst_news/dst_news_argentina08.html 
# </a> 
 
# 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. 
 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
# 
# Buenos Aires (BA), Capital Federal (CF), 
Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31 
                        -4:16:48 -      CMT     1920 May # Cordoba Mean Time 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   Arg     AR%sT 
# 
# Cordoba (CB), Santa Fe (SF), Entre Rios (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. 
# 
Zone America/Argentina/Cordoba -4:16:48 - LMT   1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1991 Mar  3 
                        -4:00   -       WART    1991 Oct 20 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   Arg     AR%sT 
# 
# Salta (SA), La Pampa (LP), Neuquen (NQ), Rio Negro (RN) 
Zone America/Argentina/Salta -4:21:40 - LMT     1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1991 Mar  3 
                        -4:00   -       WART    1991 Oct 20 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   Arg     AR%sT   2008 Oct 18 
                        -3:00   -       ART 
# 
# Tucuman (TM) 
Zone America/Argentina/Tucuman -4:20:52 - LMT   1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1991 Mar  3 
                        -4:00   -       WART    1991 Oct 20 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   -       ART     2004 Jun  1 
                        -4:00   -       WART    2004 Jun 13 
                        -3:00   Arg     AR%sT 
# 
# La Rioja (LR) 
Zone America/Argentina/La_Rioja -4:27:24 - LMT  1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1991 Mar  1 
                        -4:00   -       WART    1991 May  7 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   -       ART     2004 Jun  1 
                        -4:00   -       WART    2004 Jun 20 
                        -3:00   Arg     AR%sT   2008 Oct 18 
                        -3:00   -       ART 
# 
# San Juan (SJ) 
Zone America/Argentina/San_Juan -4:34:04 - LMT  1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1991 Mar  1 
                        -4:00   -       WART    1991 May  7 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   -       ART     2004 May 31 
                        -4:00   -       WART    2004 Jul 25 
                        -3:00   Arg     AR%sT   2008 Oct 18 
                        -3:00   -       ART 
# 
# Jujuy (JY) 
Zone America/Argentina/Jujuy -4:21:12 - LMT     1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1990 Mar  4 
                        -4:00   -       WART    1990 Oct 28 
                        -4:00   1:00    WARST   1991 Mar 17 
                        -4:00   -       WART    1991 Oct  6 
                        -3:00   1:00    ARST    1992 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   Arg     AR%sT   2008 Oct 18 
                        -3:00   -       ART 
# 
# Catamarca (CT), Chubut (CH) 
Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1991 Mar  3 
                        -4:00   -       WART    1991 Oct 20 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   -       ART     2004 Jun  1 
                        -4:00   -       WART    2004 Jun 20 
                        -3:00   Arg     AR%sT   2008 Oct 18 
                        -3:00   -       ART 
# 
# Mendoza (MZ) 
Zone America/Argentina/Mendoza -4:35:16 - LMT   1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1990 Mar  4 
                        -4:00   -       WART    1990 Oct 15 
                        -4:00   1:00    WARST   1991 Mar  1 
                        -4:00   -       WART    1991 Oct 15 
                        -4:00   1:00    WARST   1992 Mar  1 
                        -4:00   -       WART    1992 Oct 18 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   -       ART     2004 May 23 
                        -4:00   -       WART    2004 Sep 26 
                        -3:00   Arg     AR%sT   2008 Oct 18 
                        -3:00   -       ART 
# 
# San Luis (SL) 
 
Rule    SanLuis 2008    2009    -       Mar     Sun>=8  0:00    0       - 
Rule    SanLuis 2007    2009    -       Oct     Sun>=8  0:00    1:00    S 
 
Zone America/Argentina/San_Luis -4:25:24 - LMT  1894 Oct 31 
                        -4:16:48 -      CMT     1920 May 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1990 
                        -3:00   1:00    ARST    1990 Mar 14 
                        -4:00   -       WART    1990 Oct 15 
                        -4:00   1:00    WARST   1991 Mar  1 
                        -4:00   -       WART    1991 Jun  1 
                        -3:00   -       ART     1999 Oct  3 
                        -4:00   1:00    WARST   2000 Mar  3 
                        -3:00   -       ART     2004 May 31 
                        -4:00   -       WART    2004 Jul 25 
                        -3:00   Arg     AR%sT   2008 Jan 21 
                        -4:00   SanLuis WAR%sT 
# 
# Santa Cruz (SC) 
Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 
                        -4:16:48 -      CMT     1920 May # Cordoba Mean Time 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   -       ART     2004 Jun  1 
                        -4:00   -       WART    2004 Jun 20 
                        -3:00   Arg     AR%sT   2008 Oct 18 
                        -3:00   -       ART 
# 
# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF) 
Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 
                        -4:16:48 -      CMT     1920 May # Cordoba Mean Time 
                        -4:00   -       ART     1930 Dec 
                        -4:00   Arg     AR%sT   1969 Oct  5 
                        -3:00   Arg     AR%sT   1999 Oct  3 
                        -4:00   Arg     AR%sT   2000 Mar  3 
                        -3:00   -       ART     2004 May 30 
                        -4:00   -       WART    2004 Jun 20 
                        -3:00   Arg     AR%sT   2008 Oct 18 
                        -3:00   -       ART 
 
# Aruba 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone    America/Aruba   -4:40:24 -      LMT     1912 Feb 12     # Oranjestad 
                        -4:30   -       ANT     1965 # Netherlands Antilles Time 
                        -4:00   -       AST 
 
# Bolivia 
# Zone  NAME            GMTOFF  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   BOST    1932 Mar 21 # Bolivia ST 
                        -4:00   -       BOT     # Bolivia Time 
 
# 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), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ), 
# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (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 Goias 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 Amapa (AP), Ceara (CE), 
# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do 
# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST. 
 
# From Marcos Tadeu (1998-09-27): 
# <a href="http://pcdsh01.on.br/verao1.html"> 
# Brazilian official page 
# </a> 
 
# From Jesper Norgaard (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 eletronic 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 Uniao"...) in Brazil there are changes in the timezones, 
# effective today (00:00am at June 24, 2008) as follows: 
# 
# a) The timezone UTC+5 is e[x]tinguished, 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 Para 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: 
# <a href="https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008"> 
# https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008 
# </a> 
# 
# 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 Para 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. 
# <a href="http://www.worldtimezone.com/brazil-time-new-old.php"> 
# http://www.worldtimezone.com/brazil-time-new-old.php 
# </a> 
# 
# - 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 
# <a href="http://pcdsh01.on.br/DecHV.html"> 
# Decretos sobre o Horario de Verao no Brasil 
# </a>. 
 
# 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: 
# <a href="http://www.mme.gov.br/site/news/detail.do?newsId=16722"> 
# http://www.mme.gov.br/site/news/detail.do?newsId=16722 
# </a> 
# Note that this link does not always work directly, but must be accessed 
# by going to 
# <a href="http://www.mme.gov.br/first"> 
# http://www.mme.gov.br/first 
# </a> 
# 
# One example link that works directly: 
# <a href="http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54"> 
# http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54 
# (Portuguese) 
# </a> 
# 
# We have a written a short article about it as well: 
# <a href="http://www.timeanddate.com/news/time/brazil-dst-2008-2009.html"> 
# http://www.timeanddate.com/news/time/brazil-dst-2008-2009.html 
# </a> 
 
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S 
# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01) 
# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10) 
Rule    Brazil  1931    only    -       Oct      3      11:00   1:00    S 
Rule    Brazil  1932    1933    -       Apr      1       0:00   0       - 
Rule    Brazil  1932    only    -       Oct      3       0:00   1:00    S 
# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10) 
# revoked DST. 
# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24) 
# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13) 
Rule    Brazil  1949    1952    -       Dec      1       0:00   1:00    S 
Rule    Brazil  1950    only    -       Apr     16       1:00   0       - 
Rule    Brazil  1951    1952    -       Apr      1       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24) 
Rule    Brazil  1953    only    -       Mar      1       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30) 
# revoked DST. 
# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (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 <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (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    S 
# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (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 <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27) 
Rule    Brazil  1965    only    -       Jan     31       0:00   1:00    S 
Rule    Brazil  1965    only    -       Mar     31       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22) 
Rule    Brazil  1965    only    -       Dec      1       0:00   1:00    S 
# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18) 
Rule    Brazil  1966    1968    -       Mar      1       0:00   0       - 
Rule    Brazil  1966    1967    -       Nov      1       0:00   1:00    S 
# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15) 
# revoked DST. 
# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27) 
Rule    Brazil  1985    only    -       Nov      2       0:00   1:00    S 
# 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    S 
Rule    Brazil  1987    only    -       Feb     14       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22) 
Rule    Brazil  1987    only    -       Oct     25       0:00   1:00    S 
Rule    Brazil  1988    only    -       Feb      7       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (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    S 
Rule    Brazil  1989    only    -       Jan     29       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21) 
# with the same exceptions 
Rule    Brazil  1989    only    -       Oct     15       0:00   1:00    S 
Rule    Brazil  1990    only    -       Feb     11       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (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    S 
Rule    Brazil  1991    only    -       Feb     17       0:00   0       - 
# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (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    S 
Rule    Brazil  1992    only    -       Feb      9       0:00   0       - 
# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16) 
# adopted by same states. 
Rule    Brazil  1992    only    -       Oct     25       0:00   1:00    S 
Rule    Brazil  1993    only    -       Jan     31       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28) 
# adopted by same states, plus AM. 
# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22; 
# web page corrected 2004-01-07) adopted by same states, minus AM. 
# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14) 
# adopted by same states, plus MT and TO. 
# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13) 
# adds AL, SE. 
Rule    Brazil  1993    1995    -       Oct     Sun>=11  0:00   1:00    S 
Rule    Brazil  1994    1995    -       Feb     Sun>=15  0:00   0       - 
Rule    Brazil  1996    only    -       Feb     11       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04) 
# adopted by same states, minus AL, SE. 
Rule    Brazil  1996    only    -       Oct      6       0:00   1:00    S 
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    S 
# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a> 
# (1998-02-10) 
Rule    Brazil  1998    only    -       Mar      1       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11) 
# adopted by the same states as before. 
Rule    Brazil  1998    only    -       Oct     11       0:00   1:00    S 
Rule    Brazil  1999    only    -       Feb     21       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a> 
# (1999-08-23) adopted by same states. 
# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30) 
# adds SE, AL, PB, PE, RN, CE, PI, MA and RR. 
Rule    Brazil  1999    only    -       Oct      3       0:00   1:00    S 
Rule    Brazil  2000    only    -       Feb     27       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06) 
# adopted by the same states as before. 
# Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13) 
# repeals DST in PE and RR, effective 2000-10-15 00:00. 
# Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17) 
# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. 
# Decree <a href="http://pcdsh01.on.br/figuras/HV3916.gif">3,916</a> 
# (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    S 
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. 
# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm">4,399</a> 
Rule    Brazil  2002    only    -       Nov      3       0:00   1:00    S 
# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. 
# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm">4,844</a> 
Rule    Brazil  2003    only    -       Oct     19       0:00   1:00    S 
# Decree 5,223 (2004-10-01) reestablishes DST in MT. 
# <a href="http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm">5,223</a> 
Rule    Brazil  2004    only    -       Nov      2       0:00   1:00    S 
# Decree <a href="http://pcdsh01.on.br/DecHV5539.gif">5,539</a> (2005-09-19), 
# adopted by the same states as before. 
Rule    Brazil  2005    only    -       Oct     16       0:00   1:00    S 
# Decree <a href="http://pcdsh01.on.br/DecHV5920.gif">5,920</a> (2006-10-03), 
# adopted by the same states as before. 
Rule    Brazil  2006    only    -       Nov      5       0:00   1:00    S 
Rule    Brazil  2007    only    -       Feb     25       0:00   0       - 
# Decree <a href="http://pcdsh01.on.br/DecHV6212.gif">6,212</a> (2007-09-26), 
# adopted by the same states as before. 
Rule    Brazil  2007    only    -       Oct     Sun>=8   0:00   1:00    S 
# From Frederico A. C. Neves (2008-09-10): 
# Acording to this decree 
# <a href="http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm"> 
# http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm 
# </a> 
# [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    max     -       Oct     Sun>=15 0:00    1:00    S 
Rule    Brazil  2008    2011    -       Feb     Sun>=15 0:00    0       - 
Rule    Brazil  2012    only    -       Feb     Sun>=22 0:00    0       - 
Rule    Brazil  2013    2014    -       Feb     Sun>=15 0:00    0       - 
Rule    Brazil  2015    only    -       Feb     Sun>=22 0:00    0       - 
Rule    Brazil  2016    2022    -       Feb     Sun>=15 0:00    0       - 
Rule    Brazil  2023    only    -       Feb     Sun>=22 0:00    0       - 
Rule    Brazil  2024    2025    -       Feb     Sun>=15 0:00    0       - 
Rule    Brazil  2026    only    -       Feb     Sun>=22 0:00    0       - 
Rule    Brazil  2027    2033    -       Feb     Sun>=15 0:00    0       - 
Rule    Brazil  2034    only    -       Feb     Sun>=22 0:00    0       - 
Rule    Brazil  2035    2036    -       Feb     Sun>=15 0:00    0       - 
Rule    Brazil  2037    only    -       Feb     Sun>=22 0:00    0       - 
# From Arthur David Olson (2008-09-29): 
# The next is wrong in some years but is better than nothing. 
Rule    Brazil  2038    max     -       Feb     Sun>=15 0:00    0       - 
 
# The latest ruleset listed above says that the following states observe DST: 
# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. 
 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
# 
# Fernando de Noronha (administratively part of PE) 
Zone America/Noronha    -2:09:40 -      LMT     1914 
                        -2:00   Brazil  FN%sT   1990 Sep 17 
                        -2:00   -       FNT     1999 Sep 30 
                        -2:00   Brazil  FN%sT   2000 Oct 15 
                        -2:00   -       FNT     2001 Sep 13 
                        -2:00   Brazil  FN%sT   2002 Oct  1 
                        -2:00   -       FNT 
# Other Atlantic islands have no permanent settlement. 
# These include Trindade and Martin Vaz (administratively part of ES), 
# Atol das Rocas (RN), and Penedos de Sao Pedro e Sao Paulo (PE). 
# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; 
# it also included the Penedos. 
# 
# Amapa (AP), east Para (PA) 
# East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu. 
# The division between east and west Para is the river Xingu. 
# In the north a very small part from the river Javary (now Jari I guess, 
# the border with Amapa) to the Amazon, then to the Xingu. 
Zone America/Belem      -3:13:56 -      LMT     1914 
                        -3:00   Brazil  BR%sT   1988 Sep 12 
                        -3:00   -       BRT 
# 
# west Para (PA) 
# West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem. 
Zone America/Santarem   -3:38:48 -      LMT     1914 
                        -4:00   Brazil  AM%sT   1988 Sep 12 
                        -4:00   -       AMT     2008 Jun 24 00:00 
                        -3:00   -       BRT 
# 
# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN), 
# Paraiba (PB) 
Zone America/Fortaleza  -2:34:00 -      LMT     1914 
                        -3:00   Brazil  BR%sT   1990 Sep 17 
                        -3:00   -       BRT     1999 Sep 30 
                        -3:00   Brazil  BR%sT   2000 Oct 22 
                        -3:00   -       BRT     2001 Sep 13 
                        -3:00   Brazil  BR%sT   2002 Oct  1 
                        -3:00   -       BRT 
# 
# Pernambuco (PE) (except Atlantic islands) 
Zone America/Recife     -2:19:36 -      LMT     1914 
                        -3:00   Brazil  BR%sT   1990 Sep 17 
                        -3:00   -       BRT     1999 Sep 30 
                        -3:00   Brazil  BR%sT   2000 Oct 15 
                        -3:00   -       BRT     2001 Sep 13 
                        -3:00   Brazil  BR%sT   2002 Oct  1 
                        -3:00   -       BRT 
# 
# Tocantins (TO) 
Zone America/Araguaina  -3:12:48 -      LMT     1914 
                        -3:00   Brazil  BR%sT   1990 Sep 17 
                        -3:00   -       BRT     1995 Sep 14 
                        -3:00   Brazil  BR%sT   2003 Sep 24 
                        -3:00   -       BRT 
# 
# Alagoas (AL), Sergipe (SE) 
Zone America/Maceio     -2:22:52 -      LMT     1914 
                        -3:00   Brazil  BR%sT   1990 Sep 17 
                        -3:00   -       BRT     1995 Oct 13 
                        -3:00   Brazil  BR%sT   1996 Sep  4 
                        -3:00   -       BRT     1999 Sep 30 
                        -3:00   Brazil  BR%sT   2000 Oct 22 
                        -3:00   -       BRT     2001 Sep 13 
                        -3:00   Brazil  BR%sT   2002 Oct  1 
                        -3:00   -       BRT 
# 
# 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  BR%sT   2003 Sep 24 
                        -3:00   -       BRT 
# 
# Goias (GO), Distrito Federal (DF), Minas Gerais (MG), 
# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR), 
# Santa Catarina (SC), Rio Grande do Sul (RS) 
Zone America/Sao_Paulo  -3:06:28 -      LMT     1914 
                        -3:00   Brazil  BR%sT   1963 Oct 23 00:00 
                        -3:00   1:00    BRST    1964 
                        -3:00   Brazil  BR%sT 
# 
# Mato Grosso do Sul (MS) 
Zone America/Campo_Grande -3:38:28 -    LMT     1914 
                        -4:00   Brazil  AM%sT 
# 
# Mato Grosso (MT) 
Zone America/Cuiaba     -3:44:20 -      LMT     1914 
                        -4:00   Brazil  AM%sT   2003 Sep 24 
                        -4:00   -       AMT     2004 Oct  1 
                        -4:00   Brazil  AM%sT 
# 
# Rondonia (RO) 
Zone America/Porto_Velho -4:15:36 -     LMT     1914 
                        -4:00   Brazil  AM%sT   1988 Sep 12 
                        -4:00   -       AMT 
# 
# Roraima (RR) 
Zone America/Boa_Vista  -4:02:40 -      LMT     1914 
                        -4:00   Brazil  AM%sT   1988 Sep 12 
                        -4:00   -       AMT     1999 Sep 30 
                        -4:00   Brazil  AM%sT   2000 Oct 15 
                        -4:00   -       AMT 
# 
# east Amazonas (AM): Boca do Acre, Jutai, 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  AM%sT   1988 Sep 12 
                        -4:00   -       AMT     1993 Sep 28 
                        -4:00   Brazil  AM%sT   1994 Sep 22 
                        -4:00   -       AMT 
# 
# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, 
#       Eirunepe, Envira, Ipixuna 
Zone America/Eirunepe   -4:39:28 -      LMT     1914 
                        -5:00   Brazil  AC%sT   1988 Sep 12 
                        -5:00   -       ACT     1993 Sep 28 
                        -5:00   Brazil  AC%sT   1994 Sep 22 
                        -5:00   -       ACT     2008 Jun 24 00:00 
                        -4:00   -       AMT 
# 
# Acre (AC) 
Zone America/Rio_Branco -4:31:12 -      LMT     1914 
                        -5:00   Brazil  AC%sT   1988 Sep 12 
                        -5:00   -       ACT     2008 Jun 24 00:00 
                        -4:00   -       AMT 
 
# Chile 
 
# 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 Oscar van Vlijmen (2006-10-08): 
# http://www.horaoficial.cl/cambio.htm 
 
# From Jesper Norgaard Welen (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. 
 
# From Paul Eggert (2006-12-27): 
# The following data for Chile and America/Santiago are from 
# <http://www.horaoficial.cl/horaof.htm> (2006-09-20), transcribed by 
# Jesper Norgaard Welen.  The data for Pacific/Easter are from Shanks 
# & Pottenger, except with DST transitions after 1932 cloned from 
# America/Santiago.  The pre-1980 Pacific/Easter data are dubious, 
# but we have no other source. 
 
# From German Poo-Caaman~o (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  
# <a href="http://www.shoa.cl/servicios/supremo316.pdf"> 
# http://www.shoa.cl/servicios/supremo316.pdf 
# </a> 
# and the instructions for 2008 are located in: 
# <a href="http://www.horaoficial.cl/cambio.htm"> 
# http://www.horaoficial.cl/cambio.htm 
# </a>. 
 
# From Jose Miguel Garrido (2008-03-05): 
# ... 
# You could see the announces of the change on  
# <a href="http://www.shoa.cl/noticias/2008/04hora/hora.htm"> 
# http://www.shoa.cl/noticias/2008/04hora/hora.htm 
# </a>. 
 
# From Angel Chiang (2010-03-04): 
# Subject: DST in Chile exceptionally extended to 3 April due to earthquake 
# <a href="http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098"> 
# http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098 
# </a> 
# (in Spanish, last paragraph). 
# 
# This is breaking news. There should be more information available later. 
 
# From Arthur Daivd Olson (2010-03-06): 
# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch. 
 
# From Glenn Eychaner (2011-03-02): [geychaner@mac.com] 
# It appears that the Chilean government has decided to postpone the 
# change from summer time to winter time again, by three weeks to April 
# 2nd: 
# <a href="http://www.emol.com/noticias/nacional/detalle/detallenoticias.asp?idnoticia=467651"> 
# http://www.emol.com/noticias/nacional/detalle/detallenoticias.asp?idnoticia=467651 
# </a> 
# 
# This is not yet reflected in the offical "cambio de hora" site, but 
# probably will be soon: 
# <a href="http://www.horaoficial.cl/cambio.htm"> 
# http://www.horaoficial.cl/cambio.htm 
# </a> 
 
# From Arthur David Olson (2011-03-02): 
# The emol.com article mentions a water shortage as the cause of the 
# postponement, which may mean that it's not a permanent change. 
 
# From Glenn Eychaner (2011-03-28): 
# The article: 
# <a href="http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}"> 
# http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E} 
# </a> 
# 
# 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. This is a pilot plan 
# which will be reevaluated in 2012. 
 
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S 
Rule    Chile   1927    1932    -       Sep      1      0:00    1:00    S 
Rule    Chile   1928    1932    -       Apr      1      0:00    0       - 
Rule    Chile   1942    only    -       Jun      1      4:00u   0       - 
Rule    Chile   1942    only    -       Aug      1      5:00u   1:00    S 
Rule    Chile   1946    only    -       Jul     15      4:00u   1:00    S 
Rule    Chile   1946    only    -       Sep      1      3:00u   0:00    - 
Rule    Chile   1947    only    -       Apr      1      4:00u   0       - 
Rule    Chile   1968    only    -       Nov      3      4:00u   1:00    S 
Rule    Chile   1969    only    -       Mar     30      3:00u   0       - 
Rule    Chile   1969    only    -       Nov     23      4:00u   1:00    S 
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    S 
Rule    Chile   1972    1986    -       Mar     Sun>=9  3:00u   0       - 
Rule    Chile   1973    only    -       Sep     30      4:00u   1:00    S 
Rule    Chile   1974    1987    -       Oct     Sun>=9  4:00u   1:00    S 
Rule    Chile   1987    only    -       Apr     12      3:00u   0       - 
Rule    Chile   1988    1989    -       Mar     Sun>=9  3:00u   0       - 
Rule    Chile   1988    only    -       Oct     Sun>=1  4:00u   1:00    S 
Rule    Chile   1989    only    -       Oct     Sun>=9  4:00u   1:00    S 
Rule    Chile   1990    only    -       Mar     18      3:00u   0       - 
Rule    Chile   1990    only    -       Sep     16      4:00u   1:00    S 
Rule    Chile   1991    1996    -       Mar     Sun>=9  3:00u   0       - 
Rule    Chile   1991    1997    -       Oct     Sun>=9  4:00u   1:00    S 
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    S 
Rule    Chile   1999    only    -       Apr      4      3:00u   0       - 
Rule    Chile   1999    2010    -       Oct     Sun>=9  4:00u   1:00    S 
Rule    Chile   2011    only    -       Aug     Sun>=16 4:00u   1:00    S 
Rule    Chile   2012    max     -       Oct     Sun>=9  4:00u   1:00    S 
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   2012    max     -       Mar     Sun>=9  3:00u   0       - 
# IATA SSIM anomalies: (1992-02) says 1992-03-14; 
# (1996-09) says 1998-03-08.  Ignore these. 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone America/Santiago   -4:42:46 -      LMT     1890 
                        -4:42:46 -      SMT     1910        # Santiago Mean Time 
                        -5:00   -       CLT     1916 Jul  1 # Chile Time 
                        -4:42:46 -      SMT     1918 Sep  1 # Santiago Mean Time 
                        -4:00   -       CLT     1919 Jul  1 # Chile Time 
                        -4:42:46 -      SMT     1927 Sep  1 # Santiago Mean Time 
                        -5:00   Chile   CL%sT   1947 May 22 # Chile Time 
                        -4:00   Chile   CL%sT 
Zone Pacific/Easter     -7:17:44 -      LMT     1890 
                        -7:17:28 -      EMT     1932 Sep    # Easter Mean Time 
                        -7:00   Chile   EAS%sT  1982 Mar 13 21:00 # Easter I Time 
                        -6:00   Chile   EAS%sT 
# 
# Sala y Gomez Island is like Pacific/Easter. 
# Other Chilean locations, including Juan Fernandez Is, San Ambrosio, 
# San Felix, and Antarctic bases, are like America/Santiago. 
 
# Colombia 
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S 
Rule    CO      1992    only    -       May      3      0:00    1:00    S 
Rule    CO      1993    only    -       Apr      4      0:00    0       - 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone    America/Bogota  -4:56:20 -      LMT     1884 Mar 13 
                        -4:56:20 -      BMT     1914 Nov 23 # Bogota Mean Time 
                        -5:00   CO      CO%sT   # Colombia Time 
# Malpelo, Providencia, San Andres 
# no information; probably like America/Bogota 
 
# Curacao 
# 
# From Paul Eggert (2006-03-22): 
# Shanks & Pottenger say that The Bottom and Philipsburg have been at 
# -4:00 since standard time was introduced on 1912-03-02; and that 
# Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from 
# 1912-02-02 to 1965-01-01.  The former is dubious, since S&P also say 
# Saba Island has been like Curacao. 
# This all predates our 1970 cutoff, though. 
# 
# By July 2007 Curacao and St Maarten are planned to become 
# associated states within the Netherlands, much like Aruba; 
# Bonaire, Saba and St Eustatius would become directly part of the 
# Netherlands as Kingdom Islands.  This won't affect their time zones 
# though, as far as we know. 
# 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone    America/Curacao -4:35:44 -      LMT     1912 Feb 12     # Willemstad 
                        -4:30   -       ANT     1965 # Netherlands Antilles Time 
                        -4:00   -       AST 
 
# From Arthur David Olson (2011-06-15): 
# At least for now, use links for places with new iso3166 codes. 
# The name "Lower Prince's Quarter" is both longer than fourteen charaters 
# and contains an apostrophe; use "Lower_Princes" below. 
 
Link    America/Curacao America/Lower_Princes # Sint Maarten 
Link    America/Curacao America/Kralendijk # Bonaire, Sint Estatius and Saba 
 
# Ecuador 
# 
# From Paul Eggert (2007-03-04): 
# Apparently Ecuador had a failed experiment with DST in 1992. 
# <http://midena.gov.ec/content/view/1261/208/> (2007-02-27) and 
# <http://www.hoy.com.ec/NoticiaNue.asp?row_id=249856> (2006-11-06) both 
# talk about "hora Sixto".  Leave this alone for now, as we have no data. 
# 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone America/Guayaquil  -5:19:20 -      LMT     1890 
                        -5:14:00 -      QMT     1931 # Quito Mean Time 
                        -5:00   -       ECT          # Ecuador Time 
Zone Pacific/Galapagos  -5:58:24 -      LMT     1931 # Puerto Baquerizo Moreno 
                        -5:00   -       ECT     1986 
                        -6:00   -       GALT         # Galapagos Time 
 
# 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 Norgaard: 
# ... 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: 
# <a href="http://www.falklandnews.com/public/story.cfm?get=5914&source=3"> 
# http://www.falklandnews.com/public/story.cfm?get=5914&source=3 
# </a> 
# 
# 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. 
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S 
Rule    Falk    1937    1938    -       Sep     lastSun 0:00    1:00    S 
Rule    Falk    1938    1942    -       Mar     Sun>=19 0:00    0       - 
Rule    Falk    1939    only    -       Oct     1       0:00    1:00    S 
Rule    Falk    1940    1942    -       Sep     lastSun 0:00    1:00    S 
Rule    Falk    1943    only    -       Jan     1       0:00    0       - 
Rule    Falk    1983    only    -       Sep     lastSun 0:00    1:00    S 
Rule    Falk    1984    1985    -       Apr     lastSun 0:00    0       - 
Rule    Falk    1984    only    -       Sep     16      0:00    1:00    S 
Rule    Falk    1985    2000    -       Sep     Sun>=9  0:00    1:00    S 
Rule    Falk    1986    2000    -       Apr     Sun>=16 0:00    0       - 
Rule    Falk    2001    2010    -       Apr     Sun>=15 2:00    0       - 
Rule    Falk    2012    max     -       Apr     Sun>=15 2:00    0       - 
Rule    Falk    2001    max     -       Sep     Sun>=1  2:00    1:00    S 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone Atlantic/Stanley   -3:51:24 -      LMT     1890 
                        -3:51:24 -      SMT     1912 Mar 12  # Stanley Mean Time 
                        -4:00   Falk    FK%sT   1983 May     # Falkland Is Time 
                        -3:00   Falk    FK%sT   1985 Sep 15 
                        -4:00   Falk    FK%sT 
 
# French Guiana 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone America/Cayenne    -3:29:20 -      LMT     1911 Jul 
                        -4:00   -       GFT     1967 Oct # French Guiana Time 
                        -3:00   -       GFT 
 
# Guyana 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone    America/Guyana  -3:52:40 -      LMT     1915 Mar        # Georgetown 
                        -3:45   -       GBGT    1966 May 26 # Br Guiana Time 
                        -3:45   -       GYT     1975 Jul 31 # Guyana Time 
                        -3:00   -       GYT     1991 
# IATA SSIM (1996-06) says -4:00.  Assume a 1991 switch. 
                        -4:00   -       GYT 
 
# Paraguay 
# From Paul Eggert (2006-03-22): 
# Shanks & Pottenger say that spring transitions are from 01:00 -> 02:00, 
# and autumn transitions are from 00:00 -> 23:00.  Go with pre-1999 
# editions of Shanks, and with the IATA, who say transitions occur at 00:00. 
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S 
Rule    Para    1975    1988    -       Oct      1      0:00    1:00    S 
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    S 
Rule    Para    1990    only    -       Oct      1      0:00    1:00    S 
Rule    Para    1991    only    -       Oct      6      0:00    1:00    S 
Rule    Para    1992    only    -       Mar      1      0:00    0       - 
Rule    Para    1992    only    -       Oct      5      0:00    1:00    S 
Rule    Para    1993    only    -       Mar     31      0:00    0       - 
Rule    Para    1993    1995    -       Oct      1      0:00    1:00    S 
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 
# <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm"> 
# Noticias, a daily paper in Asuncion, Paraguay (2000-10-01) 
# </a>: 
# 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    S 
# 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    S 
# 
# From Jesper Norgaard 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 Raul Perasso via Jesper Norgaard Welen (2006-10-13) 
# <http://www.presidencia.gov.py/decretos/D1867.pdf> 
Rule    Para    2004    2009    -       Oct     Sun>=15 0:00    1:00    S 
Rule    Para    2005    2009    -       Mar     Sun>=8  0:00    0       - 
# From Carlos Raul Perasso (2010-02-18): 
# By decree number 3958 issued yesterday ( 
# <a href="http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf"> 
# http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf 
# </a> 
# ) 
# 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    S 
Rule    Para    2010    max     -       Apr     Sun>=8  0:00    0       - 
 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone America/Asuncion   -3:50:40 -      LMT     1890 
                        -3:50:40 -      AMT     1931 Oct 10 # Asuncion Mean Time 
                        -4:00   -       PYT     1972 Oct # Paraguay Time 
                        -3:00   -       PYT     1974 Apr 
                        -4:00   Para    PY%sT 
 
# Peru 
# 
# <a href="news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net"> 
# From Evelyn C. Leeper via Mark Brader (2003-10-26):</a> 
# 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      TYPE    IN      ON      AT      SAVE    LETTER/S 
Rule    Peru    1938    only    -       Jan      1      0:00    1:00    S 
Rule    Peru    1938    only    -       Apr      1      0:00    0       - 
Rule    Peru    1938    1939    -       Sep     lastSun 0:00    1:00    S 
Rule    Peru    1939    1940    -       Mar     Sun>=24 0:00    0       - 
Rule    Peru    1986    1987    -       Jan      1      0:00    1:00    S 
Rule    Peru    1986    1987    -       Apr      1      0:00    0       - 
Rule    Peru    1990    only    -       Jan      1      0:00    1:00    S 
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    S 
Rule    Peru    1994    only    -       Apr      1      0:00    0       - 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone    America/Lima    -5:08:12 -      LMT     1890 
                        -5:08:36 -      LMT     1908 Jul 28 # Lima Mean Time? 
                        -5:00   Peru    PE%sT   # Peru Time 
 
# South Georgia 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone Atlantic/South_Georgia -2:26:08 -  LMT     1890            # Grytviken 
                        -2:00   -       GST     # South Georgia Time 
 
# South Sandwich Is 
# uninhabited; scientific personnel have wintered 
 
# Suriname 
# Zone  NAME            GMTOFF  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   -       NEGT    1975 Nov 20 # Dutch Guiana Time 
                        -3:30   -       SRT     1984 Oct # Suriname Time 
                        -3:00   -       SRT 
 
# Trinidad and Tobago 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone America/Port_of_Spain -4:06:04 -   LMT     1912 Mar 2 
                        -4:00   -       AST 
 
# Uruguay 
# From Paul Eggert (1993-11-18): 
# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 
# From Shanks & Pottenger: 
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S 
# Whitman gives 1923 Oct 1; go with Shanks & Pottenger. 
Rule    Uruguay 1923    only    -       Oct      2       0:00   0:30    HS 
Rule    Uruguay 1924    1926    -       Apr      1       0:00   0       - 
Rule    Uruguay 1924    1925    -       Oct      1       0:00   0:30    HS 
Rule    Uruguay 1933    1935    -       Oct     lastSun  0:00   0:30    HS 
# Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman. 
Rule    Uruguay 1934    1936    -       Mar     Sat>=25 23:30s  0       - 
Rule    Uruguay 1936    only    -       Nov      1       0:00   0:30    HS 
Rule    Uruguay 1937    1941    -       Mar     lastSun  0:00   0       - 
# Whitman gives 1937 Oct 3; go with Shanks & Pottenger. 
Rule    Uruguay 1937    1940    -       Oct     lastSun  0:00   0:30    HS 
# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, 
# and 1943 Apr 13 ``to present time''; go with Shanks & Pottenger. 
Rule    Uruguay 1941    only    -       Aug      1       0:00   0:30    HS 
Rule    Uruguay 1942    only    -       Jan      1       0:00   0       - 
Rule    Uruguay 1942    only    -       Dec     14       0:00   1:00    S 
Rule    Uruguay 1943    only    -       Mar     14       0:00   0       - 
Rule    Uruguay 1959    only    -       May     24       0:00   1:00    S 
Rule    Uruguay 1959    only    -       Nov     15       0:00   0       - 
Rule    Uruguay 1960    only    -       Jan     17       0:00   1:00    S 
Rule    Uruguay 1960    only    -       Mar      6       0:00   0       - 
Rule    Uruguay 1965    1967    -       Apr     Sun>=1   0:00   1:00    S 
Rule    Uruguay 1965    only    -       Sep     26       0:00   0       - 
Rule    Uruguay 1966    1967    -       Oct     31       0:00   0       - 
Rule    Uruguay 1968    1970    -       May     27       0:00   0:30    HS 
Rule    Uruguay 1968    1970    -       Dec      2       0:00   0       - 
Rule    Uruguay 1972    only    -       Apr     24       0:00   1:00    S 
Rule    Uruguay 1972    only    -       Aug     15       0:00   0       - 
Rule    Uruguay 1974    only    -       Mar     10       0:00   0:30    HS 
Rule    Uruguay 1974    only    -       Dec     22       0:00   1:00    S 
Rule    Uruguay 1976    only    -       Oct      1       0:00   0       - 
Rule    Uruguay 1977    only    -       Dec      4       0:00   1:00    S 
Rule    Uruguay 1978    only    -       Apr      1       0:00   0       - 
Rule    Uruguay 1979    only    -       Oct      1       0:00   1:00    S 
Rule    Uruguay 1980    only    -       May      1       0:00   0       - 
Rule    Uruguay 1987    only    -       Dec     14       0:00   1:00    S 
Rule    Uruguay 1988    only    -       Mar     14       0:00   0       - 
Rule    Uruguay 1988    only    -       Dec     11       0:00   1:00    S 
Rule    Uruguay 1989    only    -       Mar     12       0:00   0       - 
Rule    Uruguay 1989    only    -       Oct     29       0:00   1:00    S 
# Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2, 
# and that 1992/3's DST was from 10-25 to 03-01.  Go with IATA. 
Rule    Uruguay 1990    1992    -       Mar     Sun>=1   0:00   0       - 
Rule    Uruguay 1990    1991    -       Oct     Sun>=21  0:00   1:00    S 
Rule    Uruguay 1992    only    -       Oct     18       0:00   1:00    S 
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.... 
# http://www.presidencia.gub.uy/decretos/2004091502.htm 
Rule    Uruguay 2004    only    -       Sep     19       0:00   1:00    S 
# 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.... 
# http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm 
Rule    Uruguay 2005    only    -       Mar     27       2:00   0       - 
# From Eduardo Cota (2005-09-27): 
# http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF 
# This means that 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. 
Rule    Uruguay 2005    only    -       Oct      9       2:00   1:00    S 
Rule    Uruguay 2006    only    -       Mar     12       2:00   0       - 
# From Jesper Norgaard Welen (2006-09-06): 
# http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF 
Rule    Uruguay 2006    max     -       Oct     Sun>=1   2:00   1:00    S 
Rule    Uruguay 2007    max     -       Mar     Sun>=8   2:00   0       - 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone America/Montevideo -3:44:44 -      LMT     1898 Jun 28 
                        -3:44:44 -      MMT     1920 May  1     # Montevideo MT 
                        -3:30   Uruguay UY%sT   1942 Dec 14     # Uruguay Time 
                        -3:00   Uruguay UY%sT 
 
# Venezuela 
# 
# 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 Republica Bolivariana 
# de Venezuela, numero 38.819" (official document for all laws or 
# resolution publication) 
# http://www.globovision.com/news.php?nid=72208 
 
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL] 
Zone    America/Caracas -4:27:44 -      LMT     1890 
                        -4:27:40 -      CMT     1912 Feb 12 # Caracas Mean Time? 
                        -4:30   -       VET     1965         # Venezuela Time 
                        -4:00   -       VET     2007 Dec  9 03:00 
                        -4:30   -       VET