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34850bd5 1# <pre>
e9ad9bde 2# @(#)southamerica 8.52
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3# This file is in the public domain, so clarified as of
4# 2009-05-17 by Arthur David Olson.
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5
6# This data is by no means authoritative; if you think you know better,
7# go ahead and edit the file (and please send any changes to
8# tz@elsie.nci.nih.gov for general use in the future).
9
bd7414aa 10# From Paul Eggert (2006-03-22):
984263bc 11# A good source for time zone historical data outside the U.S. is
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12# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
13# San Diego: ACS Publications, Inc. (2003).
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14#
15# Gwillim Law writes that a good source
16# for recent time zone data is the International Air Transport
17# Association's Standard Schedules Information Manual (IATA SSIM),
18# published semiannually. Law sent in several helpful summaries
19# of the IATA's data after 1990.
20#
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21# Except where otherwise noted, Shanks & Pottenger is the source for
22# entries through 1990, and IATA SSIM is the source for entries afterwards.
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23#
24# Earlier editions of these tables used the North American style (e.g. ARST and
25# ARDT for Argentine Standard and Daylight Time), but the following quote
26# suggests that it's better to use European style (e.g. ART and ARST).
27# I suggest the use of _Summer time_ instead of the more cumbersome
28# _daylight-saving time_. _Summer time_ seems to be in general use
29# in Europe and South America.
30# -- E O Cutler, _New York Times_ (1937-02-14), quoted in
31# H L Mencken, _The American Language: Supplement I_ (1960), p 466
32#
33# Earlier editions of these tables also used the North American style
34# for time zones in Brazil, but this was incorrect, as Brazilians say
35# "summer time". Reinaldo Goulart, a Sao Paulo businessman active in
36# the railroad sector, writes (1999-07-06):
37# The subject of time zones is currently a matter of discussion/debate in
38# Brazil. Let's say that "the Brasilia time" is considered the
39# "official time" because Brasilia is the capital city.
40# The other three time zones are called "Brasilia time "minus one" or
41# "plus one" or "plus two". As far as I know there is no such
42# name/designation as "Eastern Time" or "Central Time".
43# So I invented the following (English-language) abbreviations for now.
44# Corrections are welcome!
45# std dst
46# -2:00 FNT FNST Fernando de Noronha
47# -3:00 BRT BRST Brasilia
48# -4:00 AMT AMST Amazon
49# -5:00 ACT ACST Acre
50
51###############################################################################
52
53###############################################################################
54
55# Argentina
56
57# From Bob Devine (1988-01-28):
58# Argentina: first Sunday in October to first Sunday in April since 1976.
59# Double Summer time from 1969 to 1974. Switches at midnight.
60
61# From U. S. Naval Observatory (1988-01-199):
62# ARGENTINA 3 H BEHIND UTC
63
9ffe4b14 64# From Hernan G. Otero (1995-06-26):
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65# I am sending modifications to the Argentine time zone table...
66# AR was chosen because they are the ISO letters that represent Argentina.
67
68# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
69Rule Arg 1930 only - Dec 1 0:00 1:00 S
70Rule Arg 1931 only - Apr 1 0:00 0 -
71Rule Arg 1931 only - Oct 15 0:00 1:00 S
72Rule Arg 1932 1940 - Mar 1 0:00 0 -
73Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
74Rule Arg 1940 only - Jul 1 0:00 1:00 S
75Rule Arg 1941 only - Jun 15 0:00 0 -
76Rule Arg 1941 only - Oct 15 0:00 1:00 S
77Rule Arg 1943 only - Aug 1 0:00 0 -
78Rule Arg 1943 only - Oct 15 0:00 1:00 S
79Rule Arg 1946 only - Mar 1 0:00 0 -
80Rule Arg 1946 only - Oct 1 0:00 1:00 S
81Rule Arg 1963 only - Oct 1 0:00 0 -
82Rule Arg 1963 only - Dec 15 0:00 1:00 S
83Rule Arg 1964 1966 - Mar 1 0:00 0 -
84Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
85Rule Arg 1967 only - Apr 2 0:00 0 -
86Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
87Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
88Rule Arg 1974 only - Jan 23 0:00 1:00 S
89Rule Arg 1974 only - May 1 0:00 0 -
90Rule Arg 1988 only - Dec 1 0:00 1:00 S
91#
9ffe4b14 92# From Hernan G. Otero (1995-06-26):
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93# These corrections were contributed by InterSoft Argentina S.A.,
94# obtaining the data from the:
95# Talleres de Hidrografia Naval Argentina
96# (Argentine Naval Hydrography Institute)
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97Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
98Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
99#
9ffe4b14 100# From Hernan G. Otero (1995-06-26):
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101# From this moment on, the law that mandated the daylight saving
102# time corrections was derogated and no more modifications
103# to the time zones (for daylight saving) are now made.
104#
105# From Rives McDow (2000-01-10):
106# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
107# which did not result in the switch of a time zone, as they stayed 9 hours
108# from the International Date Line.
109Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
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110# From Paul Eggert (2007-12-28):
111# DST was set to expire on March 5, not March 3, but since it was converted
112# to standard time on March 3 it's more convenient for us to pretend that
113# it ended on March 3.
114Rule Arg 2000 only - Mar 3 0:00 0 -
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115#
116# From Peter Gradelski via Steffen Thorsen (2000-03-01):
117# We just checked with our Sao Paulo office and they say the government of
118# Argentina decided not to become one of the countries that go on or off DST.
119# So Buenos Aires should be -3 hours from GMT at all times.
120#
9ffe4b14 121# From Fabian L. Arce Jofre (2000-04-04):
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122# The law that claimed DST for Argentina was derogated by President Fernando
123# de la Rua on March 2, 2000, because it would make people spend more energy
124# in the winter time, rather than less. The change took effect on March 3.
125#
126# From Mariano Absatz (2001-06-06):
127# one of the major newspapers here in Argentina said that the 1999
128# Timezone Law (which never was effectively applied) will (would?) be
129# in effect.... The article is at
130# http://ar.clarin.com/diario/2001-06-06/e-01701.htm
131# ... The Law itself is "Ley No 25155", sanctioned on 1999-08-25, enacted
132# 1999-09-17, and published 1999-09-21. The official publication is at:
133# http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
134# Regretfully, you have to subscribe (and pay) for the on-line version....
135#
136# (2001-06-12):
137# the timezone for Argentina will not change next Sunday.
138# Apparently it will do so on Sunday 24th....
139# http://ar.clarin.com/diario/2001-06-12/s-03501.htm
140#
141# (2001-06-25):
142# Last Friday (yes, the last working day before the date of the change), the
143# Senate annulled the 1999 law that introduced the changes later postponed.
144# http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
145# It remains the vote of the Deputies..., but it will be the same....
146# This kind of things had always been done this way in Argentina.
147# We are still -03:00 all year round in all of the country.
148#
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149# From Steffen Thorsen (2007-12-21):
150# A user (Leonardo Chaim) reported that Argentina will adopt DST....
151# all of the country (all Zone-entries) are affected. News reports like
152# http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate
153# that Argentina will use DST next year as well, from October to
154# March, although exact rules are not given.
155#
156# From Jesper Norgaard Welen (2007-12-26)
157# The last hurdle of Argentina DST is over, the proposal was approved in
158# the lower chamber too (Deputados) with a vote 192 for and 2 against.
159# By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to
160# the original scanned proposal, where the dates and the zero hours are
161# clear and unambiguous...This is the article about final approval:
162# <a href="http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996">
163# http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996
164# </a>
165#
166# From Paul Eggert (2007-12-22):
167# For dates after mid-2008, the following rules are my guesses and
168# are quite possibly wrong, but are more likely than no DST at all.
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169
170# From Alexander Krivenyshev (2008-09-05):
171# As per message from Carlos Alberto Fonseca Arauz (Nicaragua),
172# Argentina will start DST on Sunday October 19, 2008.
173#
174# <a href="http://www.worldtimezone.com/dst_news/dst_news_argentina03.html">
175# http://www.worldtimezone.com/dst_news/dst_news_argentina03.html
176# </a>
177# OR
178# <a href="http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)">
179# http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)
180# </a>
181
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182# From Rodrigo Severo (2008-10-06):
183# Here is some info available at a Gentoo bug related to TZ on Argentina's DST:
184# ...
185# ------- Comment #1 from [jmdocile] 2008-10-06 16:28 0000 -------
186# Hi, there is a problem with timezone-data-2008e and maybe with
187# timezone-data-2008f
188# Argentinian law [Number] 25.155 is no longer valid.
189# <a href="http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm">
190# http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm
191# </a>
192# The new one is law [Number] 26.350
193# <a href="http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm">
194# http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm
195# </a>
196# So there is no summer time in Argentina for now.
197
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198# From Mariano Absatz (2008-10-20):
199# Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST in Argentina
200# From 2008-10-19 until 2009-03-15
201# <a href="http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01">
202# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01
203# </a>
204#
205# Decree 1705/2008 excepting 12 Provinces from applying DST in the summer 2008/2009:
206# Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La Pampa, Neuquen, Rio Negro, Chubut, Santa Cruz
207# and Tierra del Fuego
208# <a href="http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01">
209# http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
210# </a>
211#
212# Press release 235 dated Saturday October 18th, from the Government of the Province of Jujuy saying
213# it will not apply DST either (even when it was not included in Decree 1705/2008)
214# <a href="http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc">
215# http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
216# </a>
217
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218# From fullinet (2009-10-18):
219# As announced in
220# <a hef="http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356">
221# http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
222# </a>
223# (an official .gob.ar) under title: "Sin Cambio de Hora" (english: "No hour change")
224#
225# "Por el momento, el Gobierno Nacional resolvio no modificar la hora
226# oficial, decision que estaba en estudio para su implementacion el
227# domingo 18 de octubre. Desde el Ministerio de Planificacion se anuncio
228# que la Argentina hoy, en estas condiciones meteorologicas, no necesita
229# la modificacion del huso horario, ya que 2009 nos encuentra con
230# crecimiento en la produccion y distribucion energetica."
231
cd57c7c2 232Rule Arg 2007 only - Dec 30 0:00 1:00 S
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233Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
234Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 S
63562808 235
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236# From Mariano Absatz (2004-05-21):
237# Today it was officially published that the Province of Mendoza is changing
238# its timezone this winter... starting tomorrow night....
239# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
240# From Paul Eggert (2004-05-24):
241# It's Law No. 7,210. This change is due to a public power emergency, so for
242# now we'll assume it's for this year only.
984263bc 243#
bd7414aa 244# From Paul Eggert (2006-03-22):
984263bc 245# <a href="http://www.spicasc.net/horvera.html">
bd7414aa 246# Hora de verano para la Republica Argentina (2003-06-08)
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247# </a> says that standard time in Argentina from 1894-10-31
248# to 1920-05-01 was -4:16:48.25. Go with this more-precise value
bd7414aa 249# over Shanks & Pottenger.
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250#
251# From Mariano Absatz (2004-06-05):
252# These media articles from a major newspaper mostly cover the current state:
253# http://www.lanacion.com.ar/04/05/27/de_604825.asp
254# http://www.lanacion.com.ar/04/05/28/de_605203.asp
255#
256# The following eight (8) provinces pulled clocks back to UTC-04:00 at
257# midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
258# Apparently, all nine provinces would go back to UTC-03:00 at the same
259# time in October 17th.
260#
261# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
262# Tierra del Fuego, Tucuman.
263#
264# From Mariano Absatz (2004-06-14):
265# ... this weekend, the Province of Tucuman decided it'd go back to UTC-03:00
266# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
267# annoyance with the change is much higher than the power savings obtained....
268#
269# From Gwillim Law (2004-06-14):
270# http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
271# "The time change in Tierra del Fuego was a conflicted decision from
272# the start. The government had decreed that the measure would take
273# effect on June 1, but a normative error forced the new time to begin
274# three days earlier, from a Saturday to a Sunday....
275# Our understanding was that the change was originally scheduled to take place
276# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
277# provinces). Sunday was May 30, only two days earlier. So the article
278# contains a contradiction. I would give more credence to the Saturday/Sunday
279# date than the "three days earlier" phrase, and conclude that Tierra del
280# Fuego set its clocks back at 2004-05-30 00:00.
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281#
282# From Steffen Thorsen (2004-10-05):
283# The previous law 7210 which changed the province of Mendoza's time zone
284# back in May have been modified slightly in a new law 7277, which set the
285# new end date to 2004-09-26 (original date was 2004-10-17).
286# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
287#
288# From Mariano Absatz (2004-10-05):
289# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
290# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
291# at midnight between Saturday, July 24th and Sunday, July 25th....
292# http://www.sanjuan.gov.ar/prensa/archivo/000329.html
293# http://www.sanjuan.gov.ar/prensa/archivo/000426.html
294# http://www.sanjuan.gov.ar/prensa/archivo/000441.html
984263bc 295
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296# From Alex Krivenyshev (2008-01-17):
297# Here are articles that Argentina Province San Luis is planning to end DST
298# as earlier as upcoming Monday January 21, 2008 or February 2008:
299#
300# Provincia argentina retrasa reloj y marca diferencia con resto del pais
301# (Argentine Province delayed clock and mark difference with the rest of the
302# country)
303# <a href="http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel">
304# http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel
305# </a>
306#
307# Es inminente que en San Luis atrasen una hora los relojes
308# (It is imminent in San Luis clocks one hour delay)
309# <a href="http://www.lagaceta.com.ar/vernotae.asp?id_nota=253414">
310# http://www.lagaceta.com.ar/vernotae.asp?id_nota=253414
311# </a>
312#
313# <a href="http://www.worldtimezone.net/dst_news/dst_news_argentina02.html">
314# http://www.worldtimezone.net/dst_news/dst_news_argentina02.html
315# </a>
316
317# From Jesper Norgaard Welen (2008-01-18):
318# The page of the San Luis provincial government
319# <a href="http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812">
320# http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812
321# </a>
322# confirms what Alex Krivenyshev has earlier sent to the tz
323# emailing list about that San Luis plans to return to standard
324# time much earlier than the rest of the country. It also
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325# confirms that upon request the provinces San Juan and Mendoza
326# refused to follow San Luis in this change.
327#
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328# The change is supposed to take place Monday the 21.st at 0:00
329# hours. As far as I understand it if this goes ahead, we need
330# a new timezone for San Luis (although there are also documented
331# independent changes in the southamerica file of San Luis in
332# 1990 and 1991 which has not been confirmed).
333
334# From Jesper Norgaard Welen (2008-01-25):
335# Unfortunately the below page has become defunct, about the San Luis
336# time change. Perhaps because it now is part of a group of pages "Most
337# important pages of 2008."
338#
339# You can use
340# <a href="http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834">
341# http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834
342# </a>
343# instead it seems. Or use "Buscador" from the main page of the San Luis
344# government, and fill in "huso" and click OK, and you will get 3 pages
345# from which the first one is identical to the above.
346
347# From Mariano Absatz (2008-01-28):
348# I can confirm that the Province of San Luis (and so far only that
349# province) decided to go back to UTC-3 effective midnight Jan 20th 2008
350# (that is, Monday 21st at 0:00 is the time the clocks were delayed back
351# 1 hour), and they intend to keep UTC-3 as their timezone all year round
352# (that is, unless they change their mind any minute now).
353#
354# So we'll have to add yet another city to 'southamerica' (I think San
355# Luis city is the mos populated city in the Province, so it'd be
356# America/Argentina/San_Luis... of course I can't remember if San Luis's
357# history of particular changes goes along with Mendoza or San Juan :-(
358# (I only remember not being able to collect hard facts about San Luis
359# back in 2004, when these provinces changed to UTC-4 for a few days, I
360# mailed them personally and never got an answer).
361
a36b983e 362# From Paul Eggert (2008-06-30):
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363# Unless otherwise specified, data are from Shanks & Pottenger through 1992,
364# from the IATA otherwise. As noted below, Shanks & Pottenger say that
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365# America/Cordoba split into 6 subregions during 1991/1992, one of which
366# was America/San_Luis, but we haven't verified this yet so for now we'll
367# keep America/Cordoba a single region rather than splitting it into the
368# other 5 subregions.
369
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370# From Mariano Absatz (2009-03-13):
371# Yesterday (with our usual 2-day notice) the Province of San Luis
372# decided that next Sunday instead of "staying" @utc-03:00 they will go
373# to utc-04:00 until the second Saturday in October...
374#
375# The press release is at
376# <a href="http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102">
377# http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
378# </a>
379# (I couldn't find the decree, but
380# <a href="http://www.sanluis.gov.ar">
381# www.sanluis.gov.ar
382# <a/>
383# is the official page for the Province Government).
384#
385