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lh9ed821d2023-04-07 01:36:19 -07001# <pre>
2# @(#)southamerica 8.36
3# This file is in the public domain, so clarified as of
4# 2009-05-17 by Arthur David Olson.
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
10# From Paul Eggert (2006-03-22):
11# A good source for time zone historical data outside the U.S. is
12# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
13# San Diego: ACS Publications, Inc. (2003).
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#
21# Except where otherwise noted, Shanks & Pottenger is the source for
22# entries through 1990, and IATA SSIM is the source for entries afterwards.
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
64# From Hernan G. Otero (1995-06-26):
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#
92# From Hernan G. Otero (1995-06-26):
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)
97Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
98Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
99#
100# From Hernan G. Otero (1995-06-26):
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
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 -
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#
121# From Fabian L. Arce Jofre (2000-04-04):
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#
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.
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
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
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
218Rule Arg 2007 only - Dec 30 0:00 1:00 S
219Rule Arg 2008 max - Mar Sun>=15 0:00 0 -
220Rule Arg 2008 max - Oct Sun>=15 0:00 1:00 S
221
222# From Mariano Absatz (2004-05-21):
223# Today it was officially published that the Province of Mendoza is changing
224# its timezone this winter... starting tomorrow night....
225# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
226# From Paul Eggert (2004-05-24):
227# It's Law No. 7,210. This change is due to a public power emergency, so for
228# now we'll assume it's for this year only.
229#
230# From Paul Eggert (2006-03-22):
231# <a href="http://www.spicasc.net/horvera.html">
232# Hora de verano para la Republica Argentina (2003-06-08)
233# </a> says that standard time in Argentina from 1894-10-31
234# to 1920-05-01 was -4:16:48.25. Go with this more-precise value
235# over Shanks & Pottenger.
236#
237# From Mariano Absatz (2004-06-05):
238# These media articles from a major newspaper mostly cover the current state:
239# http://www.lanacion.com.ar/04/05/27/de_604825.asp
240# http://www.lanacion.com.ar/04/05/28/de_605203.asp
241#
242# The following eight (8) provinces pulled clocks back to UTC-04:00 at
243# midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
244# Apparently, all nine provinces would go back to UTC-03:00 at the same
245# time in October 17th.
246#
247# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
248# Tierra del Fuego, Tucuman.
249#
250# From Mariano Absatz (2004-06-14):
251# ... this weekend, the Province of Tucuman decided it'd go back to UTC-03:00
252# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
253# annoyance with the change is much higher than the power savings obtained....
254#
255# From Gwillim Law (2004-06-14):
256# http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
257# "The time change in Tierra del Fuego was a conflicted decision from
258# the start. The government had decreed that the measure would take
259# effect on June 1, but a normative error forced the new time to begin
260# three days earlier, from a Saturday to a Sunday....
261# Our understanding was that the change was originally scheduled to take place
262# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
263# provinces). Sunday was May 30, only two days earlier. So the article
264# contains a contradiction. I would give more credence to the Saturday/Sunday
265# date than the "three days earlier" phrase, and conclude that Tierra del
266# Fuego set its clocks back at 2004-05-30 00:00.
267#
268# From Steffen Thorsen (2004-10-05):
269# The previous law 7210 which changed the province of Mendoza's time zone
270# back in May have been modified slightly in a new law 7277, which set the
271# new end date to 2004-09-26 (original date was 2004-10-17).
272# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
273#
274# From Mariano Absatz (2004-10-05):
275# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
276# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
277# at midnight between Saturday, July 24th and Sunday, July 25th....
278# http://www.sanjuan.gov.ar/prensa/archivo/000329.html
279# http://www.sanjuan.gov.ar/prensa/archivo/000426.html
280# http://www.sanjuan.gov.ar/prensa/archivo/000441.html
281
282# From Alex Krivenyshev (2008-01-17):
283# Here are articles that Argentina Province San Luis is planning to end DST
284# as earlier as upcoming Monday January 21, 2008 or February 2008:
285#
286# Provincia argentina retrasa reloj y marca diferencia con resto del pais
287# (Argentine Province delayed clock and mark difference with the rest of the
288# country)
289# <a href="http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel">
290# http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel
291# </a>
292#
293# Es inminente que en San Luis atrasen una hora los relojes
294# (It is imminent in San Luis clocks one hour delay)
295# <a href="http://www.lagaceta.com.ar/vernotae.asp?id_nota=253414">
296# http://www.lagaceta.com.ar/vernotae.asp?id_nota=253414
297# </a>
298#
299# <a href="http://www.worldtimezone.net/dst_news/dst_news_argentina02.html">
300# http://www.worldtimezone.net/dst_news/dst_news_argentina02.html
301# </a>
302
303# From Jesper Norgaard Welen (2008-01-18):
304# The page of the San Luis provincial government
305# <a href="http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812">
306# http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812
307# </a>
308# confirms what Alex Krivenyshev has earlier sent to the tz
309# emailing list about that San Luis plans to return to standard
310# time much earlier than the rest of the country. It also
311# confirms that upon request the provinces San Juan and Mendoza
312# refused to follow San Luis in this change.
313#
314# The change is supposed to take place Monday the 21.st at 0:00
315# hours. As far as I understand it if this goes ahead, we need
316# a new timezone for San Luis (although there are also documented
317# independent changes in the southamerica file of San Luis in
318# 1990 and 1991 which has not been confirmed).
319
320# From Jesper Norgaard Welen (2008-01-25):
321# Unfortunately the below page has become defunct, about the San Luis
322# time change. Perhaps because it now is part of a group of pages "Most
323# important pages of 2008."
324#
325# You can use
326# <a href="http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834">
327# http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834
328# </a>
329# instead it seems. Or use "Buscador" from the main page of the San Luis
330# government, and fill in "huso" and click OK, and you will get 3 pages
331# from which the first one is identical to the above.
332
333# From Mariano Absatz (2008-01-28):
334# I can confirm that the Province of San Luis (and so far only that
335# province) decided to go back to UTC-3 effective midnight Jan 20th 2008
336# (that is, Monday 21st at 0:00 is the time the clocks were delayed back
337# 1 hour), and they intend to keep UTC-3 as their timezone all year round
338# (that is, unless they change their mind any minute now).
339#
340# So we'll have to add yet another city to 'southamerica' (I think San
341# Luis city is the mos populated city in the Province, so it'd be
342# America/Argentina/San_Luis... of course I can't remember if San Luis's
343# history of particular changes goes along with Mendoza or San Juan :-(
344# (I only remember not being able to collect hard facts about San Luis
345# back in 2004, when these provinces changed to UTC-4 for a few days, I
346# mailed them personally and never got an answer).
347
348# From Paul Eggert (2008-06-30):
349# Unless otherwise specified, data are from Shanks & Pottenger through 1992,
350# from the IATA otherwise. As noted below, Shanks & Pottenger say that
351# America/Cordoba split into 6 subregions during 1991/1992, one of which
352# was America/San_Luis, but we haven't verified this yet so for now we'll
353# keep America/Cordoba a single region rather than splitting it into the
354# other 5 subregions.
355
356# From Mariano Absatz (2009-03-13):
357# Yesterday (with our usual 2-day notice) the Province of San Luis
358# decided that next Sunday instead of "staying" @utc-03:00 they will go
359# to utc-04:00 until the second Saturday in October...
360#
361# The press release is at
362# <a href="http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102">
363# http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
364# </a>
365# (I couldn't find the decree, but
366# <a href="http://www.sanluis.gov.ar">
367# www.sanluis.gov.ar
368# <a/>
369# is the official page for the Province Government).
370#
371# There's also a note in only one of the major national papers (La Nación) at
372# <a href="http://www.lanacion.com.ar/nota.asp?nota_id=1107912">
373# http://www.lanacion.com.ar/nota.asp?nota_id=1107912
374# </a>
375#
376# The press release says:
377# (...) anunció que el próximo domingo a las 00:00 los puntanos deberán
378# atrasar una hora sus relojes.
379#
380# A partir de entonces, San Luis establecerá el huso horario propio de
381# la Provincia. De esta manera, durante el periodo del calendario anual
382# 2009, el cambio horario quedará comprendido entre las 00:00 del tercer
383# domingo de marzo y las 24:00 del segundo sábado de octubre.
384# Quick&dirty translation
385# (...) announced that next Sunday, at 00:00, Puntanos (the San Luis
386# inhabitants) will have to turn back one hour their clocks
387#
388# Since then, San Luis will establish its own Province timezone. Thus,
389# during 2009, this timezone change will run from 00:00 the third Sunday
390# in March until 24:00 of the second Saturday in October.
391
392# From Arthur David Olson (2009-03-16):
393# The unofficial claim at
394# <a href="http://www.timeanddate.com/news/time/san-luis-new-time-zone.html">
395# http://www.timeanddate.com/news/time/san-luis-new-time-zone.html
396# </a>
397# is that "The province will most likely follow the next daylight saving schedule,
398# which is planned for the second Sunday in October."
399
400#
401# Zone NAME GMTOFF RULES FORMAT [UNTIL]
402#
403# Buenos Aires (BA), Capital Federal (CF),
404Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
405 -4:16:48 - CMT 1920 May # Cordoba Mean Time
406 -4:00 - ART 1930 Dec
407 -4:00 Arg AR%sT 1969 Oct 5
408 -3:00 Arg AR%sT 1999 Oct 3
409 -4:00 Arg AR%sT 2000 Mar 3
410 -3:00 Arg AR%sT
411#
412# Cordoba (CB), Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN),
413# Chaco (CC), Formosa (FM), Santiago del Estero (SE)
414#
415# Shanks & Pottenger also make the following claims, which we haven't verified:
416# - Formosa switched to -3:00 on 1991-01-07.
417# - Misiones switched to -3:00 on 1990-12-29.
418# - Chaco switched to -3:00 on 1991-01-04.
419# - Santiago del Estero switched to -4:00 on 1991-04-01,
420# then to -3:00 on 1991-04-26.
421#
422Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31
423 -4:16:48 - CMT 1920 May
424 -4:00 - ART 1930 Dec
425 -4:00 Arg AR%sT 1969 Oct 5
426 -3:00 Arg AR%sT 1991 Mar 3
427 -4:00 - WART 1991 Oct 20
428 -3:00 Arg AR%sT 1999 Oct 3
429 -4:00 Arg AR%sT 2000 Mar 3
430 -3:00 Arg AR%sT
431#
432# Salta (SA), La Pampa (LP), Neuquen (NQ), Rio Negro (RN)
433Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31
434 -4:16:48 - CMT 1920 May
435 -4:00 - ART 1930 Dec
436 -4:00 Arg AR%sT 1969 Oct 5
437 -3:00 Arg AR%sT 1991 Mar 3
438 -4:00 - WART 1991 Oct 20
439 -3:00 Arg AR%sT 1999 Oct 3
440 -4:00 Arg AR%sT 2000 Mar 3
441 -3:00 Arg AR%sT 2008 Oct 18
442 -3:00 - ART
443#
444# Tucuman (TM)
445Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
446 -4:16:48 - CMT 1920 May
447 -4:00 - ART 1930 Dec
448 -4:00 Arg AR%sT 1969 Oct 5
449 -3:00 Arg AR%sT 1991 Mar 3
450 -4:00 - WART 1991 Oct 20
451 -3:00 Arg AR%sT 1999 Oct 3
452 -4:00 Arg AR%sT 2000 Mar 3
453 -3:00 - ART 2004 Jun 1
454 -4:00 - WART 2004 Jun 13
455 -3:00 Arg AR%sT
456#
457# La Rioja (LR)
458Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
459 -4:16:48 - CMT 1920 May
460 -4:00 - ART 1930 Dec
461 -4:00 Arg AR%sT 1969 Oct 5
462 -3:00 Arg AR%sT 1991 Mar 1
463 -4:00 - WART 1991 May 7
464 -3:00 Arg AR%sT 1999 Oct 3
465 -4:00 Arg AR%sT 2000 Mar 3
466 -3:00 - ART 2004 Jun 1
467 -4:00 - WART 2004 Jun 20
468 -3:00 Arg AR%sT 2008 Oct 18
469 -3:00 - ART
470#
471# San Juan (SJ)
472Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
473 -4:16:48 - CMT 1920 May
474 -4:00 - ART 1930 Dec
475 -4:00 Arg AR%sT 1969 Oct 5
476 -3:00 Arg AR%sT 1991 Mar 1
477 -4:00 - WART 1991 May 7
478 -3:00 Arg AR%sT 1999 Oct 3
479 -4:00 Arg AR%sT 2000 Mar 3
480 -3:00 - ART 2004 May 31
481 -4:00 - WART 2004 Jul 25
482 -3:00 Arg AR%sT 2008 Oct 18
483 -3:00 - ART
484#
485# Jujuy (JY)
486Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
487 -4:16:48 - CMT 1920 May
488 -4:00 - ART 1930 Dec
489 -4:00 Arg AR%sT 1969 Oct 5
490 -3:00 Arg AR%sT 1990 Mar 4
491 -4:00 - WART 1990 Oct 28
492 -4:00 1:00 WARST 1991 Mar 17
493 -4:00 - WART 1991 Oct 6
494 -3:00 1:00 ARST 1992
495 -3:00 Arg AR%sT 1999 Oct 3
496 -4:00 Arg AR%sT 2000 Mar 3
497 -3:00 Arg AR%sT 2008 Oct 18
498 -3:00 - ART
499#
500# Catamarca (CT), Chubut (CH)
501Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
502 -4:16:48 - CMT 1920 May
503 -4:00 - ART 1930 Dec
504 -4:00 Arg AR%sT 1969 Oct 5
505 -3:00 Arg AR%sT 1991 Mar 3
506 -4:00 - WART 1991 Oct 20
507 -3:00 Arg AR%sT 1999 Oct 3
508 -4:00 Arg AR%sT 2000 Mar 3
509 -3:00 - ART 2004 Jun 1
510 -4:00 - WART 2004 Jun 20
511 -3:00 Arg AR%sT 2008 Oct 18
512 -3:00 - ART
513#
514# Mendoza (MZ)
515Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
516 -4:16:48 - CMT 1920 May
517 -4:00 - ART 1930 Dec
518 -4:00 Arg AR%sT 1969 Oct 5
519 -3:00 Arg AR%sT 1990 Mar 4
520 -4:00 - WART 1990 Oct 15
521 -4:00 1:00 WARST 1991 Mar 1
522 -4:00 - WART 1991 Oct 15
523 -4:00 1:00 WARST 1992 Mar 1
524 -4:00 - WART 1992 Oct 18
525 -3:00 Arg AR%sT 1999 Oct 3
526 -4:00 Arg AR%sT 2000 Mar 3
527 -3:00 - ART 2004 May 23
528 -4:00 - WART 2004 Sep 26
529 -3:00 Arg AR%sT 2008 Oct 18
530 -3:00 - ART
531#
532# San Luis (SL)
533Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
534 -4:16:48 - CMT 1920 May
535 -4:00 - ART 1930 Dec
536 -4:00 Arg AR%sT 1969 Oct 5
537 -3:00 Arg AR%sT 1990
538 -3:00 1:00 ARST 1990 Mar 14
539 -4:00 - WART 1990 Oct 15
540 -4:00 1:00 WARST 1991 Mar 1
541 -4:00 - WART 1991 Jun 1
542 -3:00 - ART 1999 Oct 3
543 -4:00 1:00 WARST 2000 Mar 3
544 -3:00 - ART 2004 May 31
545 -4:00 - WART 2004 Jul 25
546 -3:00 Arg AR%sT 2008 Jan 21
547 -3:00 - ART 2009 Mar 15
548 -4:00 Arg WAR%sT
549#
550# Santa Cruz (SC)
551Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
552 -4:16:48 - CMT 1920 May # Cordoba Mean Time
553 -4:00 - ART 1930 Dec
554 -4:00 Arg AR%sT 1969 Oct 5
555 -3:00 Arg AR%sT 1999 Oct 3
556 -4:00 Arg AR%sT 2000 Mar 3
557 -3:00 - ART 2004 Jun 1
558 -4:00 - WART 2004 Jun 20
559 -3:00 Arg AR%sT 2008 Oct 18
560 -3:00 - ART
561#
562# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
563Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
564 -4:16:48 - CMT 1920 May # Cordoba Mean Time
565 -4:00 - ART 1930 Dec
566 -4:00 Arg AR%sT 1969 Oct 5
567 -3:00 Arg AR%sT 1999 Oct 3
568 -4:00 Arg AR%sT 2000 Mar 3
569 -3:00 - ART 2004 May 30
570 -4:00 - WART 2004 Jun 20
571 -3:00 Arg AR%sT 2008 Oct 18
572 -3:00 - ART
573
574# Aruba
575# Zone NAME GMTOFF RULES FORMAT [UNTIL]
576Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
577 -4:30 - ANT 1965 # Netherlands Antilles Time
578 -4:00 - AST
579
580# Bolivia
581# Zone NAME GMTOFF RULES FORMAT [UNTIL]
582Zone America/La_Paz -4:32:36 - LMT 1890
583 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
584 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
585 -4:00 - BOT # Bolivia Time
586
587# Brazil
588
589# From Paul Eggert (1993-11-18):
590# The mayor of Rio recently attempted to change the time zone rules
591# just in his city, in order to leave more summer time for the tourist trade.
592# The rule change lasted only part of the day;
593# the federal government refused to follow the city's rules, and business
594# was in a chaos, so the mayor backed down that afternoon.
595
596# From IATA SSIM (1996-02):
597# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
598# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
599# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
600# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
601# [The last three states are new to this issue of the IATA SSIM.]
602
603# From Gwillim Law (1996-10-07):
604# Geography, history (Tocantins was part of Goias until 1989), and other
605# sources of time zone information lead me to believe that AL, SE, and TO were
606# always in BR1, and so the only change was whether or not they observed DST....
607# The earliest issue of the SSIM I have is 2/91. Each issue from then until
608# 9/95 says that DST is observed only in the ten states I quoted from 9/95,
609# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
610# (UTC-4).... The other two time zones given for Brazil are BR3, which is
611# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
612# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
613# become part of the state of Pernambuco). The boundary between BR1 and BR2
614# has never been clearly stated. They've simply been called East and West.
615# However, some conclusions can be drawn from another IATA manual: the Airline
616# Coding Directory, which lists close to 400 airports in Brazil. For each
617# airport it gives a time zone which is coded to the SSIM. From that
618# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
619# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
620# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
621
622# From Marcos Tadeu (1998-09-27):
623# <a href="http://pcdsh01.on.br/verao1.html">
624# Brazilian official page
625# </a>
626
627# From Jesper Norgaard (2000-11-03):
628# [For an official list of which regions in Brazil use which time zones, see:]
629# http://pcdsh01.on.br/Fusbr.htm
630# http://pcdsh01.on.br/Fusbrhv.htm
631
632# From Celso Doria via David Madeo (2002-10-09):
633# The reason for the delay this year has to do with elections in Brazil.
634#
635# Unlike in the United States, elections in Brazil are 100% computerized and
636# the results are known almost immediately. Yesterday, it was the first
637# round of the elections when 115 million Brazilians voted for President,
638# Governor, Senators, Federal Deputies, and State Deputies. Nobody is
639# counting (or re-counting) votes anymore and we know there will be a second
640# round for the Presidency and also for some Governors. The 2nd round will
641# take place on October 27th.
642#
643# The reason why the DST will only begin November 3rd is that the thousands
644# of electoral machines used cannot have their time changed, and since the
645# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
646# the Government decided to postpone DST, instead of changing the Constitution
647# (maybe, for the next elections, it will be possible to change the clock)...
648
649# From Rodrigo Severo (2004-10-04):
650# It's just the biannual change made necessary by the much hyped, supposedly
651# modern Brazilian eletronic voting machines which, apparently, can't deal
652# with a time change between the first and the second rounds of the elections.
653
654# From Steffen Thorsen (2007-09-20):
655# Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00:
656# http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975
657
658# From Paul Schulze (2008-06-24):
659# ...by law number 11.662 of April 24, 2008 (published in the "Diario
660# Oficial da Uniao"...) in Brazil there are changes in the timezones,
661# effective today (00:00am at June 24, 2008) as follows:
662#
663# a) The timezone UTC+5 is e[x]tinguished, with all the Acre state and the
664# part of the Amazonas state that had this timezone now being put to the
665# timezone UTC+4
666# b) The whole Para state now is put at timezone UTC+3, instead of just
667# part of it, as was before.
668#
669# This change follows a proposal of senator Tiao Viana of Acre state, that
670# proposed it due to concerns about open television channels displaying
671# programs inappropriate to youths in the states that had the timezone
672# UTC+5 too early in the night. In the occasion, some more corrections
673# were proposed, trying to unify the timezones of any given state. This
674# change modifies timezone rules defined in decree 2.784 of 18 June,
675# 1913.
676
677# From Rodrigo Severo (2008-06-24):
678# Just correcting the URL:
679# <a href="https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008">
680# https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008
681# </a>
682#
683# As a result of the above Decree I believe the America/Rio_Branco
684# timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall
685# be created to represent the the west side of the Para State. I
686# suggest this new timezone be called Santarem as the most
687# important/populated city in the affected area.
688#
689# This new timezone would be the same as the Rio_Branco timezone up to
690# the 2008/06/24 change which would be to UTC-3 instead of UTC-4.
691
692# From Alex Krivenyshev (2008-06-24):
693# This is a quick reference page for New and Old Brazil Time Zones map.
694# <a href="http://www.worldtimezone.com/brazil-time-new-old.php">
695# http://www.worldtimezone.com/brazil-time-new-old.php
696# </a>
697#
698# - 4 time zones replaced by 3 time zones-eliminating time zone UTC- 05
699# (state Acre and the part of the Amazonas will be UTC/GMT- 04) - western
700# part of Par state is moving to one timezone UTC- 03 (from UTC -04).
701
702# From Paul Eggert (2002-10-10):
703# The official decrees referenced below are mostly taken from
704# <a href="http://pcdsh01.on.br/DecHV.html">
705# Decretos sobre o Horario de Verao no Brasil
706# </a>.
707
708# From Steffen Thorsen (2008-08-29):
709# As announced by the government and many newspapers in Brazil late
710# yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and
711# it will end on 2009-02-15 (current rule for Brazil is fine). Based on
712# past years experience with the elections, there was a good chance that
713# the start was postponed to November, but it did not happen this year.
714#
715# It has not yet been posted to http://pcdsh01.on.br/DecHV.html
716#
717# An official page about it:
718# <a href="http://www.mme.gov.br/site/news/detail.do?newsId=16722">
719# http://www.mme.gov.br/site/news/detail.do?newsId=16722
720# </a>
721# Note that this link does not always work directly, but must be accessed
722# by going to
723# <a href="http://www.mme.gov.br/first">
724# http://www.mme.gov.br/first
725# </a>
726#
727# One example link that works directly:
728# <a href="http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54">
729# http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54
730# (Portuguese)
731# </a>
732#
733# We have a written a short article about it as well:
734# <a href="http://www.timeanddate.com/news/time/brazil-dst-2008-2009.html">
735# http://www.timeanddate.com/news/time/brazil-dst-2008-2009.html
736# </a>
737
738# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
739# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
740# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
741Rule Brazil 1931 only - Oct 3 11:00 1:00 S
742Rule Brazil 1932 1933 - Apr 1 0:00 0 -
743Rule Brazil 1932 only - Oct 3 0:00 1:00 S
744# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
745# revoked DST.
746# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
747# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
748Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
749Rule Brazil 1950 only - Apr 16 1:00 0 -
750Rule Brazil 1951 1952 - Apr 1 0:00 0 -
751# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
752Rule Brazil 1953 only - Mar 1 0:00 0 -
753# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
754# revoked DST.
755# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
756# established DST from 1963-10-23 00:00 to 1964-02-29 00:00
757# in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
758# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
759# extended the above decree to all of the national territory on 12-09.
760Rule Brazil 1963 only - Dec 9 0:00 1:00 S
761# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
762# extended summer time by one day to 1964-03-01 00:00 (start of school).
763Rule Brazil 1964 only - Mar 1 0:00 0 -
764# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
765Rule Brazil 1965 only - Jan 31 0:00 1:00 S
766Rule Brazil 1965 only - Mar 31 0:00 0 -
767# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
768Rule Brazil 1965 only - Dec 1 0:00 1:00 S
769# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
770Rule Brazil 1966 1968 - Mar 1 0:00 0 -
771Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
772# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
773# revoked DST.
774# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
775Rule Brazil 1985 only - Nov 2 0:00 1:00 S
776# Decree 92,310 (1986-01-21)
777# Decree 92,463 (1986-03-13)
778Rule Brazil 1986 only - Mar 15 0:00 0 -
779# Decree 93,316 (1986-10-01)
780Rule Brazil 1986 only - Oct 25 0:00 1:00 S
781Rule Brazil 1987 only - Feb 14 0:00 0 -
782# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
783Rule Brazil 1987 only - Oct 25 0:00 1:00 S
784Rule Brazil 1988 only - Feb 7 0:00 0 -
785# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
786# except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
787Rule Brazil 1988 only - Oct 16 0:00 1:00 S
788Rule Brazil 1989 only - Jan 29 0:00 0 -
789# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
790# with the same exceptions
791Rule Brazil 1989 only - Oct 15 0:00 1:00 S
792Rule Brazil 1990 only - Feb 11 0:00 0 -
793# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
794# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
795# Decree 99,629 (1990-10-19) adds BA, MT.
796Rule Brazil 1990 only - Oct 21 0:00 1:00 S
797Rule Brazil 1991 only - Feb 17 0:00 0 -
798# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
799# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
800Rule Brazil 1991 only - Oct 20 0:00 1:00 S
801Rule Brazil 1992 only - Feb 9 0:00 0 -
802# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
803# adopted by same states.
804Rule Brazil 1992 only - Oct 25 0:00 1:00 S
805Rule Brazil 1993 only - Jan 31 0:00 0 -
806# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
807# adopted by same states, plus AM.
808# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22;
809# web page corrected 2004-01-07) adopted by same states, minus AM.
810# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
811# adopted by same states, plus MT and TO.
812# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
813# adds AL, SE.
814Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
815Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
816Rule Brazil 1996 only - Feb 11 0:00 0 -
817# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
818# adopted by same states, minus AL, SE.
819Rule Brazil 1996 only - Oct 6 0:00 1:00 S
820Rule Brazil 1997 only - Feb 16 0:00 0 -
821# From Daniel C. Sobral (1998-02-12):
822# In 1997, the DS began on October 6. The stated reason was that
823# because international television networks ignored Brazil's policy on DS,
824# they bought the wrong times on satellite for coverage of Pope's visit.
825# This year, the ending date of DS was postponed to March 1
826# to help dealing with the shortages of electric power.
827#
828# Decree 2,317 (1997-09-04), adopted by same states.
829Rule Brazil 1997 only - Oct 6 0:00 1:00 S
830# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
831# (1998-02-10)
832Rule Brazil 1998 only - Mar 1 0:00 0 -
833# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
834# adopted by the same states as before.
835Rule Brazil 1998 only - Oct 11 0:00 1:00 S
836Rule Brazil 1999 only - Feb 21 0:00 0 -
837# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
838# (1999-08-23) adopted by same states.
839# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
840# adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
841Rule Brazil 1999 only - Oct 3 0:00 1:00 S
842Rule Brazil 2000 only - Feb 27 0:00 0 -
843# Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06)
844# adopted by the same states as before.
845# Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13)
846# repeals DST in PE and RR, effective 2000-10-15 00:00.
847# Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17)
848# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
849# Decree <a href="http://pcdsh01.on.br/figuras/HV3916.gif">3,916</a>
850# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
851Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
852Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
853# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
854# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm">4,399</a>
855Rule Brazil 2002 only - Nov 3 0:00 1:00 S
856# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
857# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm">4,844</a>
858Rule Brazil 2003 only - Oct 19 0:00 1:00 S
859# Decree 5,223 (2004-10-01) reestablishes DST in MT.
860# <a href="http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm">5,223</a>
861Rule Brazil 2004 only - Nov 2 0:00 1:00 S
862# Decree <a href="http://pcdsh01.on.br/DecHV5539.gif">5,539</a> (2005-09-19),
863# adopted by the same states as before.
864Rule Brazil 2005 only - Oct 16 0:00 1:00 S
865# Decree <a href="http://pcdsh01.on.br/DecHV5920.gif">5,920</a> (2006-10-03),
866# adopted by the same states as before.
867Rule Brazil 2006 only - Nov 5 0:00 1:00 S
868Rule Brazil 2007 only - Feb 25 0:00 0 -
869# Decree <a href="http://pcdsh01.on.br/DecHV6212.gif">6,212</a> (2007-09-26),
870# adopted by the same states as before.
871Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
872# From Frederico A. C. Neves (2008-09-10):
873# Acording to this decree
874# <a href="http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm">
875# http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
876# </a>
877# [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
878# 3rd Feb Sunday. There is an exception on the return date when this is
879# the Carnival Sunday then the return date will be the next Sunday...
880Rule Brazil 2008 max - Oct Sun>=15 0:00 1:00 S
881Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
882Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
883Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
884Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
885Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
886Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
887Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
888Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
889Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
890Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
891Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
892Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
893# From Arthur David Olson (2008-09-29):
894# The next is wrong in some years but is better than nothing.
895Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
896
897# The latest ruleset listed above says that the following states observe DST:
898# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
899
900# Zone NAME GMTOFF RULES FORMAT [UNTIL]
901#
902# Fernando de Noronha (administratively part of PE)
903Zone America/Noronha -2:09:40 - LMT 1914
904 -2:00 Brazil FN%sT 1990 Sep 17
905 -2:00 - FNT 1999 Sep 30
906 -2:00 Brazil FN%sT 2000 Oct 15
907 -2:00 - FNT 2001 Sep 13
908 -2:00 Brazil FN%sT 2002 Oct 1
909 -2:00 - FNT
910# Other Atlantic islands have no permanent settlement.
911# These include Trindade and Martin Vaz (administratively part of ES),
912# Atol das Rocas (RN), and Penedos de Sao Pedro e Sao Paulo (PE).
913# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
914# it also included the Penedos.
915#
916# Amapa (AP), east Para (PA)
917# East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu.
918# The division between east and west Para is the river Xingu.
919# In the north a very small part from the river Javary (now Jari I guess,
920# the border with Amapa) to the Amazon, then to the Xingu.
921Zone America/Belem -3:13:56 - LMT 1914
922 -3:00 Brazil BR%sT 1988 Sep 12
923 -3:00 - BRT
924#
925# west Para (PA)
926# West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem.
927Zone America/Santarem -3:38:48 - LMT 1914
928 -4:00 Brazil AM%sT 1988 Sep 12
929 -4:00 - AMT 2008 Jun 24 00:00
930 -3:00 - BRT
931#
932# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
933# Paraiba (PB)
934Zone America/Fortaleza -2:34:00 - LMT 1914
935 -3:00 Brazil BR%sT 1990 Sep 17
936 -3:00 - BRT 1999 Sep 30
937 -3:00 Brazil BR%sT 2000 Oct 22
938 -3:00 - BRT 2001 Sep 13
939 -3:00 Brazil BR%sT 2002 Oct 1
940 -3:00 - BRT
941#
942# Pernambuco (PE) (except Atlantic islands)
943Zone America/Recife -2:19:36 - LMT 1914
944 -3:00 Brazil BR%sT 1990 Sep 17
945 -3:00 - BRT 1999 Sep 30
946 -3:00 Brazil BR%sT 2000 Oct 15
947 -3:00 - BRT 2001 Sep 13
948 -3:00 Brazil BR%sT 2002 Oct 1
949 -3:00 - BRT
950#
951# Tocantins (TO)
952Zone America/Araguaina -3:12:48 - LMT 1914
953 -3:00 Brazil BR%sT 1990 Sep 17
954 -3:00 - BRT 1995 Sep 14
955 -3:00 Brazil BR%sT 2003 Sep 24
956 -3:00 - BRT
957#
958# Alagoas (AL), Sergipe (SE)
959Zone America/Maceio -2:22:52 - LMT 1914
960 -3:00 Brazil BR%sT 1990 Sep 17
961 -3:00 - BRT 1995 Oct 13
962 -3:00 Brazil BR%sT 1996 Sep 4
963 -3:00 - BRT 1999 Sep 30
964 -3:00 Brazil BR%sT 2000 Oct 22
965 -3:00 - BRT 2001 Sep 13
966 -3:00 Brazil BR%sT 2002 Oct 1
967 -3:00 - BRT
968#
969# Bahia (BA)
970# There are too many Salvadors elsewhere, so use America/Bahia instead
971# of America/Salvador.
972Zone America/Bahia -2:34:04 - LMT 1914
973 -3:00 Brazil BR%sT 2003 Sep 24
974 -3:00 - BRT
975#
976# Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
977# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
978# Santa Catarina (SC), Rio Grande do Sul (RS)
979Zone America/Sao_Paulo -3:06:28 - LMT 1914
980 -3:00 Brazil BR%sT 1963 Oct 23 00:00
981 -3:00 1:00 BRST 1964
982 -3:00 Brazil BR%sT
983#
984# Mato Grosso do Sul (MS)
985Zone America/Campo_Grande -3:38:28 - LMT 1914
986 -4:00 Brazil AM%sT
987#
988# Mato Grosso (MT)
989Zone America/Cuiaba -3:44:20 - LMT 1914
990 -4:00 Brazil AM%sT 2003 Sep 24
991 -4:00 - AMT 2004 Oct 1
992 -4:00 Brazil AM%sT
993#
994# Rondonia (RO)
995Zone America/Porto_Velho -4:15:36 - LMT 1914
996 -4:00 Brazil AM%sT 1988 Sep 12
997 -4:00 - AMT
998#
999# Roraima (RR)
1000Zone America/Boa_Vista -4:02:40 - LMT 1914
1001 -4:00 Brazil AM%sT 1988 Sep 12
1002 -4:00 - AMT 1999 Sep 30
1003 -4:00 Brazil AM%sT 2000 Oct 15
1004 -4:00 - AMT
1005#
1006# east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto
1007# The great circle line from Tabatinga to Porto Acre divides
1008# east from west Amazonas.
1009Zone America/Manaus -4:00:04 - LMT 1914
1010 -4:00 Brazil AM%sT 1988 Sep 12
1011 -4:00 - AMT 1993 Sep 28
1012 -4:00 Brazil AM%sT 1994 Sep 22
1013 -4:00 - AMT
1014#
1015# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
1016# Eirunepe, Envira, Ipixuna
1017Zone America/Eirunepe -4:39:28 - LMT 1914
1018 -5:00 Brazil AC%sT 1988 Sep 12
1019 -5:00 - ACT 1993 Sep 28
1020 -5:00 Brazil AC%sT 1994 Sep 22
1021 -5:00 - ACT 2008 Jun 24 00:00
1022 -4:00 - AMT
1023#
1024# Acre (AC)
1025Zone America/Rio_Branco -4:31:12 - LMT 1914
1026 -5:00 Brazil AC%sT 1988 Sep 12
1027 -5:00 - ACT 2008 Jun 24 00:00
1028 -4:00 - AMT
1029
1030# Chile
1031
1032# From Eduardo Krell (1995-10-19):
1033# The law says to switch to DST at midnight [24:00] on the second SATURDAY
1034# of October.... The law is the same for March and October.
1035# (1998-09-29):
1036# Because of the drought this year, the government decided to go into
1037# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
1038# (unless there's another dry season next year, I guess).
1039
1040# From Julio I. Pacheco Troncoso (1999-03-18):
1041# Because of the same drought, the government decided to end DST later,
1042# on April 3, (one-time change).
1043
1044# From Oscar van Vlijmen (2006-10-08):
1045# http://www.horaoficial.cl/cambio.htm
1046
1047# From Jesper Norgaard Welen (2006-10-08):
1048# I think that there are some obvious mistakes in the suggested link
1049# from Oscar van Vlijmen,... for instance entry 66 says that GMT-4
1050# ended 1990-09-12 while entry 67 only begins GMT-3 at 1990-09-15
1051# (they should have been 1990-09-15 and 1990-09-16 respectively), but
1052# anyhow it clears up some doubts too.
1053
1054# From Paul Eggert (2006-12-27):
1055# The following data for Chile and America/Santiago are from
1056# <http://www.horaoficial.cl/horaof.htm> (2006-09-20), transcribed by
1057# Jesper Norgaard Welen. The data for Pacific/Easter are from Shanks
1058# & Pottenger, except with DST transitions after 1932 cloned from
1059# America/Santiago. The pre-1980 Pacific/Easter data are dubious,
1060# but we have no other source.
1061
1062# From German Poo-Caaman~o (2008-03-03):
1063# Due to drought, Chile extends Daylight Time in three weeks. This
1064# is one-time change (Saturday 3/29 at 24:00 for America/Santiago
1065# and Saturday 3/29 at 22:00 for Pacific/Easter)
1066# The Supreme Decree is located at
1067# <a href="http://www.shoa.cl/servicios/supremo316.pdf">
1068# http://www.shoa.cl/servicios/supremo316.pdf
1069# </a>
1070# and the instructions for 2008 are located in:
1071# <a href="http://www.horaoficial.cl/cambio.htm">
1072# http://www.horaoficial.cl/cambio.htm
1073# </a>.
1074
1075# From Jose Miguel Garrido (2008-03-05):
1076# ...
1077# You could see the announces of the change on
1078# <a href="http://www.shoa.cl/noticias/2008/04hora/hora.htm">
1079# http://www.shoa.cl/noticias/2008/04hora/hora.htm
1080# </a>.
1081
1082# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1083Rule Chile 1927 1932 - Sep 1 0:00 1:00 S
1084Rule Chile 1928 1932 - Apr 1 0:00 0 -
1085Rule Chile 1942 only - Jun 1 4:00u 0 -
1086Rule Chile 1942 only - Aug 1 5:00u 1:00 S
1087Rule Chile 1946 only - Jul 15 4:00u 1:00 S
1088Rule Chile 1946 only - Sep 1 3:00u 0:00 -
1089Rule Chile 1947 only - Apr 1 4:00u 0 -
1090Rule Chile 1968 only - Nov 3 4:00u 1:00 S
1091Rule Chile 1969 only - Mar 30 3:00u 0 -
1092Rule Chile 1969 only - Nov 23 4:00u 1:00 S
1093Rule Chile 1970 only - Mar 29 3:00u 0 -
1094Rule Chile 1971 only - Mar 14 3:00u 0 -
1095Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S
1096Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1097Rule Chile 1973 only - Sep 30 4:00u 1:00 S
1098Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S
1099Rule Chile 1987 only - Apr 12 3:00u 0 -
1100Rule Chile 1988 1989 - Mar Sun>=9 3:00u 0 -
1101Rule Chile 1988 only - Oct Sun>=1 4:00u 1:00 S
1102Rule Chile 1989 only - Oct Sun>=9 4:00u 1:00 S
1103Rule Chile 1990 only - Mar 18 3:00u 0 -
1104Rule Chile 1990 only - Sep 16 4:00u 1:00 S
1105Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1106Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S
1107Rule Chile 1997 only - Mar 30 3:00u 0 -
1108Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1109Rule Chile 1998 only - Sep 27 4:00u 1:00 S
1110Rule Chile 1999 only - Apr 4 3:00u 0 -
1111Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S
1112Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1113# N.B.: the end of March 29 in Chile is March 30 in Universal time,
1114# which is used below in specifying the transition.
1115Rule Chile 2008 only - Mar 30 3:00u 0 -
1116Rule Chile 2009 max - Mar Sun>=9 3:00u 0 -
1117# IATA SSIM anomalies: (1992-02) says 1992-03-14;
1118# (1996-09) says 1998-03-08. Ignore these.
1119# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1120Zone America/Santiago -4:42:46 - LMT 1890
1121 -4:42:46 - SMT 1910 # Santiago Mean Time
1122 -5:00 - CLT 1916 Jul 1 # Chile Time
1123 -4:42:46 - SMT 1918 Sep 1 # Santiago Mean Time
1124 -4:00 - CLT 1919 Jul 1 # Chile Time
1125 -4:42:46 - SMT 1927 Sep 1 # Santiago Mean Time
1126 -5:00 Chile CL%sT 1947 May 22 # Chile Time
1127 -4:00 Chile CL%sT
1128Zone Pacific/Easter -7:17:44 - LMT 1890
1129 -7:17:28 - EMT 1932 Sep # Easter Mean Time
1130 -7:00 Chile EAS%sT 1982 Mar 13 21:00 # Easter I Time
1131 -6:00 Chile EAS%sT
1132#
1133# Sala y Gomez Island is like Pacific/Easter.
1134# Other Chilean locations, including Juan Fernandez Is, San Ambrosio,
1135# San Felix, and Antarctic bases, are like America/Santiago.
1136
1137# Colombia
1138# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1139Rule CO 1992 only - May 3 0:00 1:00 S
1140Rule CO 1993 only - Apr 4 0:00 0 -
1141# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1142Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
1143 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
1144 -5:00 CO CO%sT # Colombia Time
1145# Malpelo, Providencia, San Andres
1146# no information; probably like America/Bogota
1147
1148# Curacao
1149#
1150# From Paul Eggert (2006-03-22):
1151# Shanks & Pottenger say that The Bottom and Philipsburg have been at
1152# -4:00 since standard time was introduced on 1912-03-02; and that
1153# Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1154# 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1155# Saba Island has been like Curacao.
1156# This all predates our 1970 cutoff, though.
1157#
1158# By July 2007 Curacao and St Maarten are planned to become
1159# associated states within the Netherlands, much like Aruba;
1160# Bonaire, Saba and St Eustatius would become directly part of the
1161# Netherlands as Kingdom Islands. This won't affect their time zones
1162# though, as far as we know.
1163#
1164# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1165Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
1166 -4:30 - ANT 1965 # Netherlands Antilles Time
1167 -4:00 - AST
1168
1169# Ecuador
1170#
1171# From Paul Eggert (2007-03-04):
1172# Apparently Ecuador had a failed experiment with DST in 1992.
1173# <http://midena.gov.ec/content/view/1261/208/> (2007-02-27) and
1174# <http://www.hoy.com.ec/NoticiaNue.asp?row_id=249856> (2006-11-06) both
1175# talk about "hora Sixto". Leave this alone for now, as we have no data.
1176#
1177# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1178Zone America/Guayaquil -5:19:20 - LMT 1890
1179 -5:14:00 - QMT 1931 # Quito Mean Time
1180 -5:00 - ECT # Ecuador Time
1181Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1182 -5:00 - ECT 1986
1183 -6:00 - GALT # Galapagos Time
1184
1185# Falklands
1186
1187# From Paul Eggert (2006-03-22):
1188# Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1189# the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1190
1191# From Falkland Islands Government Office, London (2001-01-22)
1192# via Jesper Norgaard:
1193# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1194# April 2001 and advance one hour to summer time at 2 am on Sunday 2
1195# September. It is anticipated that the clocks will revert back at 2
1196# am on Sunday 21 April 2002 and advance to summer time at 2 am on
1197# Sunday 1 September.
1198
1199# From Rives McDow (2001-02-13):
1200#
1201# I have communicated several times with people there, and the last
1202# time I had communications that was helpful was in 1998. Here is
1203# what was said then:
1204#
1205# "The general rule was that Stanley used daylight saving and the Camp
1206# did not. However for various reasons many people in the Camp have
1207# started to use daylight saving (known locally as 'Stanley Time')
1208# There is no rule as to who uses daylight saving - it is a matter of
1209# personal choice and so it is impossible to draw a map showing who
1210# uses it and who does not. Any list would be out of date as soon as
1211# it was produced. This year daylight saving ended on April 18/19th
1212# and started again on September 12/13th. I do not know what the rule
1213# is, but can find out if you like. We do not change at the same time
1214# as UK or Chile."
1215#
1216# I did have in my notes that the rule was "Second Saturday in Sep at
1217# 0:00 until third Saturday in Apr at 0:00". I think that this does
1218# not agree in some cases with Shanks; is this true?
1219#
1220# Also, there is no mention in the list that some areas in the
1221# Falklands do not use DST. I have found in my communications there
1222# that these areas are on the western half of East Falkland and all of
1223# West Falkland. Stanley is the only place that consistently observes
1224# DST. Again, as in other places in the world, the farmers don't like
1225# it. West Falkland is almost entirely sheep farmers.
1226#
1227# I know one lady there that keeps a list of which farm keeps DST and
1228# which doesn't each year. She runs a shop in Stanley, and says that
1229# the list changes each year. She uses it to communicate to her
1230# customers, catching them when they are home for lunch or dinner.
1231
1232# From Paul Eggert (2001-03-05):
1233# For now, we'll just record the time in Stanley, since we have no
1234# better info.
1235
1236# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1237Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
1238Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1239Rule Falk 1939 only - Oct 1 0:00 1:00 S
1240Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
1241Rule Falk 1943 only - Jan 1 0:00 0 -
1242Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
1243Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1244Rule Falk 1984 only - Sep 16 0:00 1:00 S
1245Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
1246Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1247Rule Falk 2001 max - Apr Sun>=15 2:00 0 -
1248Rule Falk 2001 max - Sep Sun>=1 2:00 1:00 S
1249# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1250Zone Atlantic/Stanley -3:51:24 - LMT 1890
1251 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1252 -4:00 Falk FK%sT 1983 May # Falkland Is Time
1253 -3:00 Falk FK%sT 1985 Sep 15
1254 -4:00 Falk FK%sT
1255
1256# French Guiana
1257# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1258Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1259 -4:00 - GFT 1967 Oct # French Guiana Time
1260 -3:00 - GFT
1261
1262# Guyana
1263# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1264Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1265 -3:45 - GBGT 1966 May 26 # Br Guiana Time
1266 -3:45 - GYT 1975 Jul 31 # Guyana Time
1267 -3:00 - GYT 1991
1268# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1269 -4:00 - GYT
1270
1271# Paraguay
1272# From Paul Eggert (2006-03-22):
1273# Shanks & Pottenger say that spring transitions are from 01:00 -> 02:00,
1274# and autumn transitions are from 00:00 -> 23:00. Go with pre-1999
1275# editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1276# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1277Rule Para 1975 1988 - Oct 1 0:00 1:00 S
1278Rule Para 1975 1978 - Mar 1 0:00 0 -
1279Rule Para 1979 1991 - Apr 1 0:00 0 -
1280Rule Para 1989 only - Oct 22 0:00 1:00 S
1281Rule Para 1990 only - Oct 1 0:00 1:00 S
1282Rule Para 1991 only - Oct 6 0:00 1:00 S
1283Rule Para 1992 only - Mar 1 0:00 0 -
1284Rule Para 1992 only - Oct 5 0:00 1:00 S
1285Rule Para 1993 only - Mar 31 0:00 0 -
1286Rule Para 1993 1995 - Oct 1 0:00 1:00 S
1287Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1288Rule Para 1996 only - Mar 1 0:00 0 -
1289# IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1290# From Steffen Thorsen (2000-10-02):
1291# I have three independent reports that Paraguay changed to DST this Sunday
1292# (10-01).
1293#
1294# Translated by Gwillim Law (2001-02-27) from
1295# <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm">
1296# Noticias, a daily paper in Asuncion, Paraguay (2000-10-01)
1297# </a>:
1298# Starting at 0:00 today, the clock will be set forward 60 minutes, in
1299# fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1300# system has been operating for several years. Formerly there was a separate
1301# decree each year; the new law has the same effect, but permanently. Every
1302# year, the time will change on the first Sunday of October; likewise, the
1303# clock will be set back on the first Sunday of March.
1304#
1305Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
1306# IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1307Rule Para 1997 only - Feb lastSun 0:00 0 -
1308# Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1309# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1310Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1311# From Rives McDow (2002-02-28):
1312# A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the
1313# dst method to be from the first Sunday in September to the first Sunday in
1314# April.
1315Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1316Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
1317#
1318# From Jesper Norgaard Welen (2005-01-02):
1319# There are several sources that claim that Paraguay made
1320# a timezone rule change in autumn 2004.
1321# From Steffen Thorsen (2005-01-05):
1322# Decree 1,867 (2004-03-05)
1323# From Carlos Raul Perasso via Jesper Norgaard Welen (2006-10-13)
1324# <http://www.presidencia.gov.py/decretos/D1867.pdf>
1325Rule Para 2004 max - Oct Sun>=15 0:00 1:00 S
1326Rule Para 2005 max - Mar Sun>=8 0:00 0 -
1327
1328# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1329Zone America/Asuncion -3:50:40 - LMT 1890
1330 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
1331 -4:00 - PYT 1972 Oct # Paraguay Time
1332 -3:00 - PYT 1974 Apr
1333 -4:00 Para PY%sT
1334
1335# Peru
1336#
1337# <a href="news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net">
1338# From Evelyn C. Leeper via Mark Brader (2003-10-26):</a>
1339# When we were in Peru in 1985-1986, they apparently switched over
1340# sometime between December 29 and January 3 while we were on the Amazon.
1341#
1342# From Paul Eggert (2006-03-22):
1343# Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1344
1345# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1346Rule Peru 1938 only - Jan 1 0:00 1:00 S
1347Rule Peru 1938 only - Apr 1 0:00 0 -
1348Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
1349Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1350Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
1351Rule Peru 1986 1987 - Apr 1 0:00 0 -
1352Rule Peru 1990 only - Jan 1 0:00 1:00 S
1353Rule Peru 1990 only - Apr 1 0:00 0 -
1354# IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1355Rule Peru 1994 only - Jan 1 0:00 1:00 S
1356Rule Peru 1994 only - Apr 1 0:00 0 -
1357# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1358Zone America/Lima -5:08:12 - LMT 1890
1359 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1360 -5:00 Peru PE%sT # Peru Time
1361
1362# South Georgia
1363# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1364Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1365 -2:00 - GST # South Georgia Time
1366
1367# South Sandwich Is
1368# uninhabited; scientific personnel have wintered
1369
1370# Suriname
1371# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1372Zone America/Paramaribo -3:40:40 - LMT 1911
1373 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1374 -3:40:36 - PMT 1945 Oct # The capital moved?
1375 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
1376 -3:30 - SRT 1984 Oct # Suriname Time
1377 -3:00 - SRT
1378
1379# Trinidad and Tobago
1380# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1381Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
1382 -4:00 - AST
1383
1384# Uruguay
1385# From Paul Eggert (1993-11-18):
1386# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1387# From Shanks & Pottenger:
1388# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1389# Whitman gives 1923 Oct 1; go with Shanks & Pottenger.
1390Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1391Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1392Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1393Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1394# Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman.
1395Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1396Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1397Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1398# Whitman gives 1937 Oct 3; go with Shanks & Pottenger.
1399Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1400# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1401# and 1943 Apr 13 ``to present time''; go with Shanks & Pottenger.
1402Rule Uruguay 1941 only - Aug 1 0:00 0:30 HS
1403Rule Uruguay 1942 only - Jan 1 0:00 0 -
1404Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1405Rule Uruguay 1943 only - Mar 14 0:00 0 -
1406Rule Uruguay 1959 only - May 24 0:00 1:00 S
1407Rule Uruguay 1959 only - Nov 15 0:00 0 -
1408Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1409Rule Uruguay 1960 only - Mar 6 0:00 0 -
1410Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1411Rule Uruguay 1965 only - Sep 26 0:00 0 -
1412Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1413Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1414Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1415Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1416Rule Uruguay 1972 only - Aug 15 0:00 0 -
1417Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1418Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1419Rule Uruguay 1976 only - Oct 1 0:00 0 -
1420Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1421Rule Uruguay 1978 only - Apr 1 0:00 0 -
1422Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1423Rule Uruguay 1980 only - May 1 0:00 0 -
1424Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1425Rule Uruguay 1988 only - Mar 14 0:00 0 -
1426Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1427Rule Uruguay 1989 only - Mar 12 0:00 0 -
1428Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1429# Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2,
1430# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1431Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1432Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1433Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1434Rule Uruguay 1993 only - Feb 28 0:00 0 -
1435# From Eduardo Cota (2004-09-20):
1436# The uruguayan government has decreed a change in the local time....
1437# http://www.presidencia.gub.uy/decretos/2004091502.htm
1438Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1439# From Steffen Thorsen (2005-03-11):
1440# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1441# save energy ... it was postponed two weeks....
1442# http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1443Rule Uruguay 2005 only - Mar 27 2:00 0 -
1444# From Eduardo Cota (2005-09-27):
1445# http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1446# This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1447# 02:00 local time, official time in Uruguay will be at GMT -2.
1448Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1449Rule Uruguay 2006 only - Mar 12 2:00 0 -
1450# From Jesper Norgaard Welen (2006-09-06):
1451# http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF
1452Rule Uruguay 2006 max - Oct Sun>=1 2:00 1:00 S
1453Rule Uruguay 2007 max - Mar Sun>=8 2:00 0 -
1454# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1455Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1456 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1457 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
1458 -3:00 Uruguay UY%sT
1459
1460# Venezuela
1461#
1462# From John Stainforth (2007-11-28):
1463# ... the change for Venezuela originally expected for 2007-12-31 has
1464# been brought forward to 2007-12-09. The official announcement was
1465# published today in the "Gaceta Oficial de la Republica Bolivariana
1466# de Venezuela, numero 38.819" (official document for all laws or
1467# resolution publication)
1468# http://www.globovision.com/news.php?nid=72208
1469
1470# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1471Zone America/Caracas -4:27:44 - LMT 1890
1472 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1473 -4:30 - VET 1965 # Venezuela Time
1474 -4:00 - VET 2007 Dec 9 03:00
1475 -4:30 - VET