2
3# This data is by no means authoritative; if you think you know better,
4# go ahead and edit the file (and please send any changes to
5# tz@elsie.nci.nih.gov for general use in the future).
6
7# From Paul Eggert (1999-07-07):
8# A good source for time zone historical data outside the U.S. is
9# Thomas G. Shanks, The International Atlas (5th edition),
10# San Diego: ACS Publications, Inc. (1999).
11#
12# Gwillim Law writes that a good source
13# for recent time zone data is the International Air Transport
14# Association's Standard Schedules Information Manual (IATA SSIM),
15# published semiannually. Law sent in several helpful summaries
16# of the IATA's data after 1990.
17#
18# Except where otherwise noted, Shanks is the source for entries through 1990,
19# and IATA SSIM is the source for entries after 1990.
20#
21# Earlier editions of these tables used the North American style (e.g. ARST and
22# ARDT for Argentine Standard and Daylight Time), but the following quote
23# suggests that it's better to use European style (e.g. ART and ARST).
24# I suggest the use of _Summer time_ instead of the more cumbersome
25# _daylight-saving time_. _Summer time_ seems to be in general use
26# in Europe and South America.
27# -- E O Cutler, _New York Times_ (1937-02-14), quoted in
28# H L Mencken, _The American Language: Supplement I_ (1960), p 466
29#
30# Earlier editions of these tables also used the North American style
31# for time zones in Brazil, but this was incorrect, as Brazilians say
32# "summer time". Reinaldo Goulart, a Sao Paulo businessman active in
33# the railroad sector, writes (1999-07-06):
34# The subject of time zones is currently a matter of discussion/debate in
35# Brazil. Let's say that "the Brasilia time" is considered the
36# "official time" because Brasilia is the capital city.
37# The other three time zones are called "Brasilia time "minus one" or
38# "plus one" or "plus two". As far as I know there is no such
39# name/designation as "Eastern Time" or "Central Time".
40# So I invented the following (English-language) abbreviations for now.
41# Corrections are welcome!
42# std dst
43# -2:00 FNT FNST Fernando de Noronha
44# -3:00 BRT BRST Brasilia
45# -4:00 AMT AMST Amazon
46# -5:00 ACT ACST Acre
47
48###############################################################################
49
50###############################################################################
51
52# Argentina
53
54# From Bob Devine (1988-01-28):
55# Argentina: first Sunday in October to first Sunday in April since 1976.
56# Double Summer time from 1969 to 1974. Switches at midnight.
57
58# From U. S. Naval Observatory (1988-01-199):
59# ARGENTINA 3 H BEHIND UTC
60
61# From Hernan G. Otero (1995-06-26):
62# I am sending modifications to the Argentine time zone table...
63# AR was chosen because they are the ISO letters that represent Argentina.
64
65# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
66Rule Arg 1930 only - Dec 1 0:00 1:00 S
67Rule Arg 1931 only - Apr 1 0:00 0 -
68Rule Arg 1931 only - Oct 15 0:00 1:00 S
69Rule Arg 1932 1940 - Mar 1 0:00 0 -
70Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
71Rule Arg 1940 only - Jul 1 0:00 1:00 S
72Rule Arg 1941 only - Jun 15 0:00 0 -
73Rule Arg 1941 only - Oct 15 0:00 1:00 S
74Rule Arg 1943 only - Aug 1 0:00 0 -
75Rule Arg 1943 only - Oct 15 0:00 1:00 S
76Rule Arg 1946 only - Mar 1 0:00 0 -
77Rule Arg 1946 only - Oct 1 0:00 1:00 S
78Rule Arg 1963 only - Oct 1 0:00 0 -
79Rule Arg 1963 only - Dec 15 0:00 1:00 S
80Rule Arg 1964 1966 - Mar 1 0:00 0 -
81Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
82Rule Arg 1967 only - Apr 2 0:00 0 -
83Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
84Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
85Rule Arg 1974 only - Jan 23 0:00 1:00 S
86Rule Arg 1974 only - May 1 0:00 0 -
87Rule Arg 1988 only - Dec 1 0:00 1:00 S
88#
89# From Hernan G. Otero (1995-06-26):
90# These corrections were contributed by InterSoft Argentina S.A.,
91# obtaining the data from the:
92# Talleres de Hidrografia Naval Argentina
93# (Argentine Naval Hydrography Institute)
94#
95# Shanks stops after 1992-03-01; go with Otero.
96Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
97Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
98#
99# From Hernan G. Otero (1995-06-26):
100# From this moment on, the law that mandated the daylight saving
101# time corrections was derogated and no more modifications
102# to the time zones (for daylight saving) are now made.
103#
104# From Rives McDow (2000-01-10):
105# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
106# which did not result in the switch of a time zone, as they stayed 9 hours
107# from the International Date Line.
108Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
109Rule Arg 2000 only - Mar Sun>=1 0:00 0 -
110#
111# From Peter Gradelski via Steffen Thorsen (2000-03-01):
112# We just checked with our Sao Paulo office and they say the government of
113# Argentina decided not to become one of the countries that go on or off DST.
114# So Buenos Aires should be -3 hours from GMT at all times.
115#
116# From Fabian L. Arce Jofre (2000-04-04):
117# The law that claimed DST for Argentina was derogated by President Fernando
118# de la Rua on March 2, 2000, because it would make people spend more energy
119# in the winter time, rather than less. The change took effect on March 3.
120#
121# From Mariano Absatz (2001-06-06):
122# one of the major newspapers here in Argentina said that the 1999
123# Timezone Law (which never was effectively applied) will (would?) be
124# in effect.... The article is at
125# http://ar.clarin.com/diario/2001-06-06/e-01701.htm
126# ... The Law itself is "Ley No 25155", sanctioned on 1999-08-25, enacted
127# 1999-09-17, and published 1999-09-21. The official publication is at:
128# http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
129# Regretfully, you have to subscribe (and pay) for the on-line version....
130#
131# (2001-06-12):
132# the timezone for Argentina will not change next Sunday.
133# Apparently it will do so on Sunday 24th....
134# http://ar.clarin.com/diario/2001-06-12/s-03501.htm
135#
136# (2001-06-25):
137# Last Friday (yes, the last working day before the date of the change), the
138# Senate annulled the 1999 law that introduced the changes later postponed.
139# http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
140# It remains the vote of the Deputies..., but it will be the same....
141# This kind of things had always been done this way in Argentina.
142# We are still -03:00 all year round in all of the country.
143#
144# From Mariano Absatz (2004-05-21):
145# Today it was officially published that the Province of Mendoza is changing
146# its timezone this winter... starting tomorrow night....
147# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
148# From Paul Eggert (2004-05-24):
149# It's Law No. 7,210. This change is due to a public power emergency, so for
150# now we'll assume it's for this year only.
151#
152# From Paul Eggert (2002-01-22):
153# <a href="http://www.spicasc.net/horvera.html">
154# Hora de verano para la Republica Argentina (2000-10-01)
155# </a> says that standard time in Argentina from 1894-10-31
156# to 1920-05-01 was -4:16:48.25. Go with this more-precise value
157# over Shanks.
158#
159# From Mariano Absatz (2004-06-05):
160# These media articles from a major newspaper mostly cover the current state:
161# http://www.lanacion.com.ar/04/05/27/de_604825.asp
162# http://www.lanacion.com.ar/04/05/28/de_605203.asp
163#
164# The following eight (8) provinces pulled clocks back to UTC-04:00 at
165# midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
166# Apparently, all nine provinces would go back to UTC-03:00 at the same
167# time in October 17th.
168#
169# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
170# Tierra del Fuego, Tucuman.
171#
172# From Mariano Absatz (2004-06-14):
173# ... this weekend, the Province of Tucuman decided it'd go back to UTC-03:00
174# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
175# annoyance with the change is much higher than the power savings obtained....
176#
177# From Gwillim Law (2004-06-14):
178# http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
179# "The time change in Tierra del Fuego was a conflicted decision from
180# the start. The government had decreed that the measure would take
181# effect on June 1, but a normative error forced the new time to begin
182# three days earlier, from a Saturday to a Sunday....
183# Our understanding was that the change was originally scheduled to take place
184# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
185# provinces). Sunday was May 30, only two days earlier. So the article
186# contains a contradiction. I would give more credence to the Saturday/Sunday
187# date than the "three days earlier" phrase, and conclude that Tierra del
188# Fuego set its clocks back at 2004-05-30 00:00.
189#
190# From Steffen Thorsen (2004-10-05):
191# The previous law 7210 which changed the province of Mendoza's time zone
192# back in May have been modified slightly in a new law 7277, which set the
193# new end date to 2004-09-26 (original date was 2004-10-17).
194# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
195#
196# From Mariano Absatz (2004-10-05):
197# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
198# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
199# at midnight between Saturday, July 24th and Sunday, July 25th....
200# http://www.sanjuan.gov.ar/prensa/archivo/000329.html
201# http://www.sanjuan.gov.ar/prensa/archivo/000426.html
202# http://www.sanjuan.gov.ar/prensa/archivo/000441.html
203
204# Unless otherwise specified, data are from Shanks through 1992, from
205# the IATA otherwise. As noted below, Shanks says that
206# America/Cordoba split into 6 subregions during 1991/1992, but we
207# haven't verified this yet so for now we'll keep it a single region.
208#
209# Zone NAME GMTOFF RULES FORMAT [UNTIL]
210#
211# Buenos Aires (BA), Capital Federal (CF),
212Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
213 -4:16:48 - CMT 1920 May # Cordoba Mean Time
214 -4:00 - ART 1930 Dec
215 -4:00 Arg AR%sT 1969 Oct 5
216 -3:00 Arg AR%sT 1999 Oct 3
217 -4:00 Arg AR%sT 2000 Mar 3
218 -3:00 - ART
219#
220# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
221# Formosa (FM), Salta (SA), Santiago del Estero (SE), Cordoba (CB),
222# San Luis (SL), La Pampa (LP), Neuquen (NQ), Rio Negro (RN)
223#
224# Shanks also makes the following claims, which we haven't verified:
225# - Formosa switched to -3:00 on 1991-01-07.
226# - Misiones switched to -3:00 on 1990-12-29.
227# - Chaco switched to -3:00 on 1991-01-04.
228# - San Luis switched to -4:00 on 1990-03-14, then to -3:00 on 1990-10-15,
229# then to -4:00 on 1991-03-01, then to -3:00 on 1991-06-01.
230# - Santiago del Estero switched to -4:00 on 1991-04-01,
231# then to -3:00 on 1991-04-26.
232#
233Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31
234 -4:16:48 - CMT 1920 May
235 -4:00 - ART 1930 Dec
236 -4:00 Arg AR%sT 1969 Oct 5
237 -3:00 Arg AR%sT 1991 Mar 3
238 -4:00 - WART 1991 Oct 20
239 -3:00 Arg AR%sT 1999 Oct 3
240 -4:00 Arg AR%sT 2000 Mar 3
241 -3:00 - ART
242#
243# Tucuman (TM)
244Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
245 -4:16:48 - CMT 1920 May
246 -4:00 - ART 1930 Dec
247 -4:00 Arg AR%sT 1969 Oct 5
248 -3:00 Arg AR%sT 1991 Mar 3
249 -4:00 - WART 1991 Oct 20
250 -3:00 Arg AR%sT 1999 Oct 3
251 -4:00 Arg AR%sT 2000 Mar 3
252 -3:00 - ART 2004 Jun 1
253 -4:00 - WART 2004 Jun 13
254 -3:00 - ART
255#
256# La Rioja (LR)
257Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
258 -4:16:48 - CMT 1920 May
259 -4:00 - ART 1930 Dec
260 -4:00 Arg AR%sT 1969 Oct 5
261 -3:00 Arg AR%sT 1991 Mar 1
262 -4:00 - WART 1991 May 7
263 -3:00 Arg AR%sT 1999 Oct 3
264 -4:00 Arg AR%sT 2000 Mar 3
265 -3:00 - ART 2004 Jun 1
266 -4:00 - WART 2004 Jun 20
267 -3:00 - ART
268#
269# San Juan (SJ)
270Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
271 -4:16:48 - CMT 1920 May
272 -4:00 - ART 1930 Dec
273 -4:00 Arg AR%sT 1969 Oct 5
274 -3:00 Arg AR%sT 1991 Mar 1
275 -4:00 - WART 1991 May 7
276 -3:00 Arg AR%sT 1999 Oct 3
277 -4:00 Arg AR%sT 2000 Mar 3
278 -3:00 - ART 2004 May 31
279 -4:00 - WART 2004 Jul 25
280 -3:00 - ART
281#
282# Jujuy (JY)
283Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
284 -4:16:48 - CMT 1920 May
285 -4:00 - ART 1930 Dec
286 -4:00 Arg AR%sT 1969 Oct 5
287 -3:00 Arg AR%sT 1990 Mar 4
288 -4:00 - WART 1990 Oct 28
289 -4:00 1:00 WARST 1991 Mar 17
290 -4:00 - WART 1991 Oct 6
291 -3:00 1:00 ARST 1992
292 -3:00 Arg AR%sT 1999 Oct 3
293 -4:00 Arg AR%sT 2000 Mar 3
294 -3:00 - ART
295#
296# Catamarca (CT), Chubut (CH)
297Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
298 -4:16:48 - CMT 1920 May
299 -4:00 - ART 1930 Dec
300 -4:00 Arg AR%sT 1969 Oct 5
301 -3:00 Arg AR%sT 1991 Mar 3
302 -4:00 - WART 1991 Oct 20
303 -3:00 Arg AR%sT 1999 Oct 3
304 -4:00 Arg AR%sT 2000 Mar 3
305 -3:00 - ART 2004 Jun 1
306 -4:00 - WART 2004 Jun 20
307 -3:00 - ART
308#
309# Mendoza (MZ)
310Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
311 -4:16:48 - CMT 1920 May
312 -4:00 - ART 1930 Dec
313 -4:00 Arg AR%sT 1969 Oct 5
314 -3:00 Arg AR%sT 1990 Mar 4
315 -4:00 - WART 1990 Oct 15
316 -4:00 1:00 WARST 1991 Mar 1
317 -4:00 - WART 1991 Oct 15
318 -4:00 1:00 WARST 1992 Mar 1
319 -4:00 - WART 1992 Oct 18
320 -3:00 Arg AR%sT 1999 Oct 3
321 -4:00 Arg AR%sT 2000 Mar 3
322 -3:00 - ART 2004 May 23
323 -4:00 - WART 2004 Sep 26
324 -3:00 - ART
325#
326# Santa Cruz (SC)
327Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
328 -4:16:48 - CMT 1920 May # Cordoba Mean Time
329 -4:00 - ART 1930 Dec
330 -4:00 Arg AR%sT 1969 Oct 5
331 -3:00 Arg AR%sT 1999 Oct 3
332 -4:00 Arg AR%sT 2000 Mar 3
333 -3:00 - ART 2004 Jun 1
334 -4:00 - WART 2004 Jun 20
335 -3:00 - ART
336#
337# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
338Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
339 -4:16:48 - CMT 1920 May # Cordoba Mean Time
340 -4:00 - ART 1930 Dec
341 -4:00 Arg AR%sT 1969 Oct 5
342 -3:00 Arg AR%sT 1999 Oct 3
343 -4:00 Arg AR%sT 2000 Mar 3
344 -3:00 - ART 2004 May 30
345 -4:00 - WART 2004 Jun 20
346 -3:00 - ART
347
348# Aruba
349# Zone NAME GMTOFF RULES FORMAT [UNTIL]
350Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
351 -4:30 - ANT 1965 # Netherlands Antilles Time
352 -4:00 - AST
353
354# Bolivia
355# Zone NAME GMTOFF RULES FORMAT [UNTIL]
356Zone America/La_Paz -4:32:36 - LMT 1890
357 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
358 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
359 -4:00 - BOT # Bolivia Time
360
361# Brazil
362
363# From Paul Eggert (1993-11-18):
364# The mayor of Rio recently attempted to change the time zone rules
365# just in his city, in order to leave more summer time for the tourist trade.
366# The rule change lasted only part of the day;
367# the federal government refused to follow the city's rules, and business
368# was in a chaos, so the mayor backed down that afternoon.
369
370# From IATA SSIM (1996-02):
371# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
372# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
373# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
374# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
375# [The last three states are new to this issue of the IATA SSIM.]
376
377# From Gwillim Law (1996-10-07):
378# Geography, history (Tocantins was part of Goias until 1989), and other
379# sources of time zone information lead me to believe that AL, SE, and TO were
380# always in BR1, and so the only change was whether or not they observed DST....
381# The earliest issue of the SSIM I have is 2/91. Each issue from then until
382# 9/95 says that DST is observed only in the ten states I quoted from 9/95,
383# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
384# (UTC-4).... The other two time zones given for Brazil are BR3, which is
385# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
386# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
387# become part of the state of Pernambuco). The boundary between BR1 and BR2
388# has never been clearly stated. They've simply been called East and West.
389# However, some conclusions can be drawn from another IATA manual: the Airline
390# Coding Directory, which lists close to 400 airports in Brazil. For each
391# airport it gives a time zone which is coded to the SSIM. From that
392# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
393# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
394# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
395
396# From Marcos Tadeu (1998-09-27):
397# <a href="http://pcdsh01.on.br/verao1.html">
398# Brazilian official page
399# </a>
400
401# From Jesper Norgaard (2000-11-03):
402# [For an official list of which regions in Brazil use which time zones, see:]
403# http://pcdsh01.on.br/Fusbr.htm
404# http://pcdsh01.on.br/Fusbrhv.htm
405
406# From Celso Doria via David Madeo (2002-10-09):
407# The reason for the delay this year has to do with elections in Brazil.
408#
409# Unlike in the United States, elections in Brazil are 100% computerized and
410# the results are known almost immediately. Yesterday, it was the first
411# round of the elections when 115 million Brazilians voted for President,
412# Governor, Senators, Federal Deputies, and State Deputies. Nobody is
413# counting (or re-counting) votes anymore and we know there will be a second
414# round for the Presidency and also for some Governors. The 2nd round will
415# take place on October 27th.
416#
417# The reason why the DST will only begin November 3rd is that the thousands
418# of electoral machines used cannot have their time changed, and since the
419# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
420# the Government decided to postpone DST, instead of changing the Constitution
421# (maybe, for the next elections, it will be possible to change the clock)...
422
423# From Rodrigo Severo (2004-10-04):
424# It's just the biannual change made necessary by the much hyped, supposedly
425# modern Brazilian eletronic voting machines which, apparently, can't deal
426# with a time change between the first and the second rounds of the elections.
427
428# From Paul Eggert (2002-10-10):
429# The official decrees referenced below are mostly taken from
430# <a href="http://pcdsh01.on.br/DecHV.html">
431# Decretos sobre o Horario de Verao no Brasil
432# </a> (2001-09-20, in Portuguese).
433# The official site for all decrees, including those not related to time, is
434# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/principal_ano.htm">
435# Presidencia da Republica, Subchefia para Assuntos Juridicos, Decretos
436# </a> (in Portuguese).
437
438# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
439# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
440# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
441Rule Brazil 1931 only - Oct 3 11:00 1:00 S
442Rule Brazil 1932 1933 - Apr 1 0:00 0 -
443Rule Brazil 1932 only - Oct 3 0:00 1:00 S
444# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
445# revoked DST.
446# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
447# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
448Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
449Rule Brazil 1950 only - Apr 16 1:00 0 -
450Rule Brazil 1951 1952 - Apr 1 0:00 0 -
451# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
452Rule Brazil 1953 only - Mar 1 0:00 0 -
453# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
454# revoked DST.
455# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
456# established DST from 1963-10-23 00:00 to 1964-02-29 00:00
457# in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
458# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
459# extended the above decree to all of the national territory on 12-09.
460Rule Brazil 1963 only - Dec 9 0:00 1:00 S
461# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
462# extended summer time by one day to 1964-03-01 00:00 (start of school).
463Rule Brazil 1964 only - Mar 1 0:00 0 -
464# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
465Rule Brazil 1965 only - Jan 31 0:00 1:00 S
466Rule Brazil 1965 only - Mar 31 0:00 0 -
467# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
468Rule Brazil 1965 only - Dec 1 0:00 1:00 S
469# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
470Rule Brazil 1966 1968 - Mar 1 0:00 0 -
471Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
472# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
473# revoked DST.
474# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
475Rule Brazil 1985 only - Nov 2 0:00 1:00 S
476# Decree 92,310 (1986-01-21)
477# Decree 92,463 (1986-03-13)
478Rule Brazil 1986 only - Mar 15 0:00 0 -
479# Decree 93,316 (1986-10-01)
480Rule Brazil 1986 only - Oct 25 0:00 1:00 S
481Rule Brazil 1987 only - Feb 14 0:00 0 -
482# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
483Rule Brazil 1987 only - Oct 25 0:00 1:00 S
484Rule Brazil 1988 only - Feb 7 0:00 0 -
485# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
486# except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
487Rule Brazil 1988 only - Oct 16 0:00 1:00 S
488Rule Brazil 1989 only - Jan 29 0:00 0 -
489# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
490# with the same exceptions
491Rule Brazil 1989 only - Oct 15 0:00 1:00 S
492Rule Brazil 1990 only - Feb 11 0:00 0 -
493# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
494# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
495# Decree 99,629 (1990-10-19) adds BA, MT.
496Rule Brazil 1990 only - Oct 21 0:00 1:00 S
497Rule Brazil 1991 only - Feb 17 0:00 0 -
498# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
499# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
500Rule Brazil 1991 only - Oct 20 0:00 1:00 S
501Rule Brazil 1992 only - Feb 9 0:00 0 -
502# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
503# adopted by same states.
504Rule Brazil 1992 only - Oct 25 0:00 1:00 S
505Rule Brazil 1993 only - Jan 31 0:00 0 -
506# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
507# adopted by same states, plus AM.
508# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22;
509# web page corrected 2004-01-07) adopted by same states, minus AM.
510# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
511# adopted by same states, plus MT and TO.
512# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
513# adds AL, SE.
514Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
515Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
516Rule Brazil 1996 only - Feb 11 0:00 0 -
517# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
518# adopted by same states, minus AL, SE.
519Rule Brazil 1996 only - Oct 6 0:00 1:00 S
520Rule Brazil 1997 only - Feb 16 0:00 0 -
521# From Daniel C. Sobral (1998-02-12):
522# In 1997, the DS began on October 6. The stated reason was that
523# because international television networks ignored Brazil's policy on DS,
524# they bought the wrong times on satellite for coverage of Pope's visit.
525# This year, the ending date of DS was postponed to March 1
526# to help dealing with the shortages of electric power.
527#
528# Decree 2,317 (1997-09-04), adopted by same states.
529Rule Brazil 1997 only - Oct 6 0:00 1:00 S
530# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
531# (1998-02-10)
532Rule Brazil 1998 only - Mar 1 0:00 0 -
533# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
534# adopted by the same states as before.
535Rule Brazil 1998 only - Oct 11 0:00 1:00 S
536Rule Brazil 1999 only - Feb 21 0:00 0 -
537# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
538# (1999-08-23) adopted by same states.
539# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
540# adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
541Rule Brazil 1999 only - Oct 3 0:00 1:00 S
542Rule Brazil 2000 only - Feb 27 0:00 0 -
543# Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06)
544# adopted by the same states as before.
545# Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13)
546# repeals DST in PE and RR, effective 2000-10-15 00:00.
547# Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17)
548# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
549# Decree <a href="http://pcdsh01.on.br/figuras/HV3916.gif">3,916</a>
550# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
551Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
552Rule Brazil 2001 max - Feb Sun>=15 0:00 0 -
553# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
554# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm"></a>
555Rule Brazil 2002 only - Nov 3 0:00 1:00 S
556# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
557# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm"></a>
558Rule Brazil 2003 only - Oct 19 0:00 1:00 S
559# Decree 5,223 (2004-10-01) reestablishes DST in MT.
560# <a href="http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm"></a>
561Rule Brazil 2004 only - Nov 2 0:00 1:00 S
562# Decree <a href="http://pcdsh01.on.br/DecHV5539.gif">5,539</a> (2005-09-19),
563# adopted by the same states as before.
564Rule Brazil 2005 max - Oct Sun>=15 0:00 1:00 S
565# The latest ruleset listed above says that the following states observe DST:
566# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
567# For dates after mid-2006, the above rules with TO="max" are guesses
568# and are quite possibly wrong, but are more likely than no DST at all.
569
570
571# Zone NAME GMTOFF RULES FORMAT [UNTIL]
572#
573# Fernando de Noronha (administratively part of PE)
574Zone America/Noronha -2:09:40 - LMT 1914
575 -2:00 Brazil FN%sT 1990 Sep 17
576 -2:00 - FNT 1999 Sep 30
577 -2:00 Brazil FN%sT 2000 Oct 15
578 -2:00 - FNT 2001 Sep 13
579 -2:00 Brazil FN%sT 2002 Oct 1
580 -2:00 - FNT
581# Other Atlantic islands have no permanent settlement.
582# These include Trindade and Martin Vaz (administratively part of ES),
583# Atol das Rocas (RN), and Penedos de Sao Pedro e Sao Paulo (PE).
584# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
585# it also included the Penedos.
586#
587# Amapa (AP), east Para (PA)
588# East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu.
589# The division between east and west Para is the river Xingu.
590# In the north a very small part from the river Javary (now Jari I guess,
591# the border with Amapa) to the Amazon, then to the Xingu.
592Zone America/Belem -3:13:56 - LMT 1914
593 -3:00 Brazil BR%sT 1988 Sep 12
594 -3:00 - BRT
595#
596# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
597# Paraiba (PB)
598Zone America/Fortaleza -2:34:00 - LMT 1914
599 -3:00 Brazil BR%sT 1990 Sep 17
600 -3:00 - BRT 1999 Sep 30
601 -3:00 Brazil BR%sT 2000 Oct 22
602 -3:00 - BRT 2001 Sep 13
603 -3:00 Brazil BR%sT 2002 Oct 1
604 -3:00 - BRT
605#
606# Pernambuco (PE) (except Atlantic islands)
607Zone America/Recife -2:19:36 - LMT 1914
608 -3:00 Brazil BR%sT 1990 Sep 17
609 -3:00 - BRT 1999 Sep 30
610 -3:00 Brazil BR%sT 2000 Oct 15
611 -3:00 - BRT 2001 Sep 13
612 -3:00 Brazil BR%sT 2002 Oct 1
613 -3:00 - BRT
614#
615# Tocantins (TO)
616Zone America/Araguaina -3:12:48 - LMT 1914
617 -3:00 Brazil BR%sT 1990 Sep 17
618 -3:00 - BRT 1995 Sep 14
619 -3:00 Brazil BR%sT 2003 Sep 24
620 -3:00 - BRT
621#
622# Alagoas (AL), Sergipe (SE)
623Zone America/Maceio -2:22:52 - LMT 1914
624 -3:00 Brazil BR%sT 1990 Sep 17
625 -3:00 - BRT 1995 Oct 13
626 -3:00 Brazil BR%sT 1996 Sep 4
627 -3:00 - BRT 1999 Sep 30
628 -3:00 Brazil BR%sT 2000 Oct 22
629 -3:00 - BRT 2001 Sep 13
630 -3:00 Brazil BR%sT 2002 Oct 1
631 -3:00 - BRT
632#
633# Bahia (BA)
634# There are too many Salvadors elsewhere, so use America/Bahia instead
635# of America/Salvador.
636Zone America/Bahia -2:34:04 - LMT 1914
637 -3:00 Brazil BR%sT 2003 Sep 24
638 -3:00 - BRT
639#
640# Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
641# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
642# Santa Catarina (SC), Rio Grande do Sul (RS)
643Zone America/Sao_Paulo -3:06:28 - LMT 1914
644 -3:00 Brazil BR%sT 1963 Oct 23 00:00
645 -3:00 1:00 BRST 1964
646 -3:00 Brazil BR%sT
647#
648# Mato Grosso do Sul (MS)
649Zone America/Campo_Grande -3:38:28 - LMT 1914
650 -4:00 Brazil AM%sT
651#
652# Mato Grosso (MT)
653Zone America/Cuiaba -3:44:20 - LMT 1914
654 -4:00 Brazil AM%sT 2003 Sep 24
655 -4:00 - AMT 2004 Oct 1
656 -4:00 Brazil AM%sT
657#
658# west Para (PA), Rondonia (RO)
659# West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem.
660Zone America/Porto_Velho -4:15:36 - LMT 1914
661 -4:00 Brazil AM%sT 1988 Sep 12
662 -4:00 - AMT
663#
664# Roraima (RR)
665Zone America/Boa_Vista -4:02:40 - LMT 1914
666 -4:00 Brazil AM%sT 1988 Sep 12
667 -4:00 - AMT 1999 Sep 30
668 -4:00 Brazil AM%sT 2000 Oct 15
669 -4:00 - AMT
670#
671# east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto
672# The great circle line from Tabatinga to Porto Acre divides
673# east from west Amazonas.
674Zone America/Manaus -4:00:04 - LMT 1914
675 -4:00 Brazil AM%sT 1988 Sep 12
676 -4:00 - AMT 1993 Sep 28
677 -4:00 Brazil AM%sT 1994 Sep 22
678 -4:00 - AMT
679#
680# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
681# Eirunepe, Envira, Ipixuna
682Zone America/Eirunepe -4:39:28 - LMT 1914
683 -5:00 Brazil AC%sT 1988 Sep 12
684 -5:00 - ACT 1993 Sep 28
685 -5:00 Brazil AC%sT 1994 Sep 22
686 -5:00 - ACT
687#
688# Acre (AC)
689Zone America/Rio_Branco -4:31:12 - LMT 1914
690 -5:00 Brazil AC%sT 1988 Sep 12
691 -5:00 - ACT
692
693
694# Chile
695
696# From Eduardo Krell (1995-10-19):
697# The law says to switch to DST at midnight [24:00] on the second SATURDAY
698# of October.... The law is the same for March and October.
699# (1998-09-29):
700# Because of the drought this year, the government decided to go into
701# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
702# (unless there's another dry season next year, I guess).
703
704# From Julio I. Pacheco Troncoso (1999-03-18):
705# Because of the same drought, the government decided to end DST later,
706# on April 3, (one-time change).
707
708# From Gwillim Law (2001-05-04):
709# I came across another article in "La Tercera" about Chilean DST.
710# <http://www.tercera.cl/diario/2000/10/13/t-extras.html>
711# It clearly confirms my earlier suggestion, that DST begins at 22:00
712# on Easter Island.... But it also seems to be saying that the
713# observance of DST in Chile began in 1966, rather than 1969 as
714# ... [Shanks] has it....
715#
716# My translation:
717#
718# "The Chilean Army has announced that summer time will begin tomorrow,
719# Saturday, October 14 in continental Chile, insular Chile, and
720# Antarctica, as provided by Supreme Decree 25 of January 11, 1966.
721# By the preceding, official time in continental Chile and Chilean
722# Antarctic, and official time in Western Insular Chile, which applies
723# to Easter Island and Sala y Gomez Island, will be set forward at
724# midnight and at 22:00, respectively, by 20 minutes."
725
726# From Paul Eggert (2001-05-04):
727# Go with this article in preference to Shanks's 1969 date for modern DST.
728# Assume this rule has been used since DST was introduced in the islands.
729
730# From Paul Eggert (2002-10-24):
731# <http://www.shoa.cl/shoa/faqhoraoficial.htm> gives many details that
732# disagree with the following table, but we haven't had time to compare them.
733
734# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
735Rule Chile 1918 only - Sep 1 0:00 1:00 S
736Rule Chile 1919 only - Jul 2 0:00 0 -
737Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
738Rule Chile 1928 1932 - Apr 1 0:00 0 -
739Rule Chile 1966 1997 - Oct Sun>=9 4:00u 1:00 S
740Rule Chile 1967 1998 - Mar Sun>=9 3:00u 0 -
741Rule Chile 1998 only - Sep 27 4:00u 1:00 S
742Rule Chile 1999 only - Apr 4 3:00u 0 -
743Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S
744Rule Chile 2000 max - Mar Sun>=9 3:00u 0 -
745# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
746# (1996-09) says 1998-03-08. Ignore these.
747# Zone NAME GMTOFF RULES FORMAT [UNTIL]
748Zone America/Santiago -4:42:40 - LMT 1890
749 -4:42:40 - SMT 1910 # Santiago Mean Time
750 -5:00 Chile CL%sT 1932 Sep # Chile Time
751 -4:00 Chile CL%sT
752Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
753 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
754 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
755 -6:00 Chile EAS%sT
756#
757# Sala y Gomez Island is like Pacific/Easter.
758# Other Chilean locations, including Juan Fernandez Is, San Ambrosio,
759# San Felix, and Antarctic bases, are like America/Santiago.
760
761# Colombia
762# Shanks specifies 24:00 for 1992 transition times; go with IATA,
763# as it seems implausible to change clocks at midnight New Year's Eve.
764# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
765Rule CO 1992 only - May 2 0:00 1:00 S
766Rule CO 1992 only - Dec 31 0:00 0 -
767# Zone NAME GMTOFF RULES FORMAT [UNTIL]
768Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
769 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
770 -5:00 CO CO%sT # Colombia Time
771# Malpelo, Providencia, San Andres
772# no information; probably like America/Bogota
773
774# Curacao
775# Shanks says that Bottom and Oranjestad have been at -4:00 since
776# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
777# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
778# This all predates our 1970 cutoff, though.
779# Zone NAME GMTOFF RULES FORMAT [UNTIL]
780Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
781 -4:30 - ANT 1965 # Netherlands Antilles Time
782 -4:00 - AST
783
784# Ecuador
785# Zone NAME GMTOFF RULES FORMAT [UNTIL]
786Zone America/Guayaquil -5:19:20 - LMT 1890
787 -5:14:00 - QMT 1931 # Quito Mean Time
788 -5:00 - ECT # Ecuador Time
789Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
790 -5:00 - ECT 1986
791 -6:00 - GALT # Galapagos Time
792
793# Falklands
794
795# From Paul Eggert (2001-03-05):
796# Between 1990 and 2000 inclusive, Shanks and the IATA agree except
797# the IATA gives 1996-09-08. Go with Shanks.
798
799# From Falkland Islands Government Office, London (2001-01-22)
800# via Jesper Norgaard:
801# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
802# April 2001 and advance one hour to summer time at 2 am on Sunday 2
803# September. It is anticipated that the clocks will revert back at 2
804# am on Sunday 21 April 2002 and advance to summer time at 2 am on
805# Sunday 1 September.
806
807# From Rives McDow (2001-02-13):
808#
809# I have communicated several times with people there, and the last
810# time I had communications that was helpful was in 1998. Here is
811# what was said then:
812#
813# "The general rule was that Stanley used daylight saving and the Camp
814# did not. However for various reasons many people in the Camp have
815# started to use daylight saving (known locally as 'Stanley Time')
816# There is no rule as to who uses daylight saving - it is a matter of
817# personal choice and so it is impossible to draw a map showing who
818# uses it and who does not. Any list would be out of date as soon as
819# it was produced. This year daylight saving ended on April 18/19th
820# and started again on September 12/13th. I do not know what the rule
821# is, but can find out if you like. We do not change at the same time
822# as UK or Chile."
823#
824# I did have in my notes that the rule was "Second Saturday in Sep at
825# 0:00 until third Saturday in Apr at 0:00". I think that this does
826# not agree in some cases with Shanks; is this true?
827#
828# Also, there is no mention in the list that some areas in the
829# Falklands do not use DST. I have found in my communications there
830# that these areas are on the western half of East Falkland and all of
831# West Falkland. Stanley is the only place that consistently observes
832# DST. Again, as in other places in the world, the farmers don't like
833# it. West Falkland is almost entirely sheep farmers.
834#
835# I know one lady there that keeps a list of which farm keeps DST and
836# which doesn't each year. She runs a shop in Stanley, and says that
837# the list changes each year. She uses it to communicate to her
838# customers, catching them when they are home for lunch or dinner.
839
840# From Paul Eggert (2001-03-05):
841# For now, we'll just record the time in Stanley, since we have no
842# better info.
843
844# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
845Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
846Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
847Rule Falk 1939 only - Oct 1 0:00 1:00 S
848Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
849Rule Falk 1943 only - Jan 1 0:00 0 -
850Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
851Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
852Rule Falk 1984 only - Sep 16 0:00 1:00 S
853Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
854Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
855Rule Falk 2001 max - Apr Sun>=15 2:00 0 -
856Rule Falk 2001 max - Sep Sun>=1 2:00 1:00 S
857# Zone NAME GMTOFF RULES FORMAT [UNTIL]
858Zone Atlantic/Stanley -3:51:24 - LMT 1890
859 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
860 -4:00 Falk FK%sT 1983 May # Falkland Is Time
861 -3:00 Falk FK%sT 1985 Sep 15
862 -4:00 Falk FK%sT
863
864# French Guiana
865# Zone NAME GMTOFF RULES FORMAT [UNTIL]
866Zone America/Cayenne -3:29:20 - LMT 1911 Jul
867 -4:00 - GFT 1967 Oct # French Guiana Time
868 -3:00 - GFT
869
870# Guyana
871# Zone NAME GMTOFF RULES FORMAT [UNTIL]
872Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
873 -3:45 - GBGT 1966 May 26 # Br Guiana Time
874 -3:45 - GYT 1975 Jul 31 # Guyana Time
875 -3:00 - GYT 1991
876# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
877 -4:00 - GYT
878
879# Paraguay
880# From Paul Eggert (1999-10-29):
881# Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
882# and autumn transitions are from 00:00 -> 23:00. Go with earlier
883# editions of Shanks, and with the IATA, who say transitions occur at 00:00.
884# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
885Rule Para 1975 1988 - Oct 1 0:00 1:00 S
886Rule Para 1975 1978 - Mar 1 0:00 0 -
887Rule Para 1979 1991 - Apr 1 0:00 0 -
888Rule Para 1989 only - Oct 22 0:00 1:00 S
889Rule Para 1990 only - Oct 1 0:00 1:00 S
890Rule Para 1991 only - Oct 6 0:00 1:00 S
891Rule Para 1992 only - Mar 1 0:00 0 -
892Rule Para 1992 only - Oct 5 0:00 1:00 S
893Rule Para 1993 only - Mar 31 0:00 0 -
894Rule Para 1993 1995 - Oct 1 0:00 1:00 S
895Rule Para 1994 1995 - Feb lastSun 0:00 0 -
896Rule Para 1996 only - Mar 1 0:00 0 -
897# IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
898# From Steffen Thorsen (2000-10-02):
899# I have three independent reports that Paraguay changed to DST this Sunday
900# (10-01).
901#
902# Translated by Gwillim Law (2001-02-27) from
903# <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm">
904# Noticias, a daily paper in Asuncion, Paraguay (2000-10-01)
905# </a>:
906# Starting at 0:00 today, the clock will be set forward 60 minutes, in
907# fulfillment of Decree No. 7,273 of the Executive Power.... The time change
908# system has been operating for several years. Formerly there was a separate
909# decree each year; the new law has the same effect, but permanently. Every
910# year, the time will change on the first Sunday of October; likewise, the
911# clock will be set back on the first Sunday of March.
912#
913# From Jesper Norgaard (2001-03-06) [an official URL saying similar things]:
914# http://gateway.abc.com.py:8000/pub/pag04.mbr/artic?FHA=2001-03-03-02.24.52.900592
915#
916Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
917# IATA SSIM (1997-09) says Mar 1; go with Shanks.
918Rule Para 1997 only - Feb lastSun 0:00 0 -
919# Shanks says 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
920# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
921Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
922# From Rives McDow (2002-02-28):
923# A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the
924# dst method to be from the first Sunday in September to the first Sunday in
925# April.
926Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
927Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
928#
929# From Jesper Norgaard Welen (2005-01-02):
930# There are several sources that claim that Paraguay made
931# a timezone rule change in autumn 2004.
932# From Steffen Thorsen (2005-01-05):
933# Decree 1,867 (2004-03-05) <http://www.labor.com.py/noticias.asp?id=27>
934Rule Para 2004 max - Oct Sun>=15 0:00 1:00 S
935Rule Para 2005 max - Mar Sun>=8 0:00 0 -
936
937# Zone NAME GMTOFF RULES FORMAT [UNTIL]
938Zone America/Asuncion -3:50:40 - LMT 1890
939 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
940 -4:00 - PYT 1972 Oct # Paraguay Time
941 -3:00 - PYT 1974 Apr
942 -4:00 Para PY%sT
943
944# Peru
945#
946# <a href="news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net">
947# From Evelyn C. Leeper via Mark Brader (2003-10-26):</a>
948# When we were in Peru in 1985-1986, they apparently switched over
949# sometime between December 29 and January 3 while we were on the Amazon.
950#
951# From Paul Eggert (2003-11-02):
952# Shanks doesn't have this transition. Assume 1986 was like 1987.
953
954# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
955Rule Peru 1938 only - Jan 1 0:00 1:00 S
956Rule Peru 1938 only - Apr 1 0:00 0 -
957Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
958Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
959Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
960Rule Peru 1986 1987 - Apr 1 0:00 0 -
961Rule Peru 1990 only - Jan 1 0:00 1:00 S
962Rule Peru 1990 only - Apr 1 0:00 0 -
963# IATA is ambiguous for 1993/1995; go with Shanks.
964Rule Peru 1994 only - Jan 1 0:00 1:00 S
965Rule Peru 1994 only - Apr 1 0:00 0 -
966# Zone NAME GMTOFF RULES FORMAT [UNTIL]
967Zone America/Lima -5:08:12 - LMT 1890
968 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
969 -5:00 Peru PE%sT # Peru Time
970
971# South Georgia
972# Zone NAME GMTOFF RULES FORMAT [UNTIL]
973Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
974 -2:00 - GST # South Georgia Time
975
976# South Sandwich Is
977# uninhabited; scientific personnel have wintered
978
979# Suriname
980# Zone NAME GMTOFF RULES FORMAT [UNTIL]
981Zone America/Paramaribo -3:40:40 - LMT 1911
982 -3:40:52 - PMT 1935 # Paramaribo Mean Time
983 -3:40:36 - PMT 1945 Oct # The capital moved?
984 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
985 -3:30 - SRT 1984 Oct # Suriname Time
986 -3:00 - SRT
987
988# Trinidad and Tobago
989# Zone NAME GMTOFF RULES FORMAT [UNTIL]
990Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
991 -4:00 - AST
992
993# Uruguay
994# From Paul Eggert (1993-11-18):
995# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
996# From Shanks:
997# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
998# Whitman gives 1923 Oct 1; go with Shanks.
999Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1000Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1001Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1002Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1003# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
1004Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1005Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1006Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1007# Whitman gives 1937 Oct 3; go with Shanks.
1008Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1009# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1010# and 1943 Apr 13 ``to present time''; go with Shanks.
1011Rule Uruguay 1941 only - Aug 1 0:00 0 -
1012Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
1013Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1014Rule Uruguay 1943 only - Mar 14 0:00 0 -
1015Rule Uruguay 1959 only - May 24 0:00 1:00 S
1016Rule Uruguay 1959 only - Nov 15 0:00 0 -
1017Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1018Rule Uruguay 1960 only - Mar 6 0:00 0 -
1019Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1020Rule Uruguay 1965 only - Sep 26 0:00 0 -
1021Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1022Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1023Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1024Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1025Rule Uruguay 1972 only - Aug 15 0:00 0 -
1026Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1027Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1028Rule Uruguay 1976 only - Oct 1 0:00 0 -
1029Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1030Rule Uruguay 1978 only - Apr 1 0:00 0 -
1031Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1032Rule Uruguay 1980 only - May 1 0:00 0 -
1033Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1034Rule Uruguay 1988 only - Mar 14 0:00 0 -
1035Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1036Rule Uruguay 1989 only - Mar 12 0:00 0 -
1037Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1038# Shanks says no DST was observed in 1990/1 and 1991/2,
1039# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1040Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1041Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1042Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1043Rule Uruguay 1993 only - Feb 28 0:00 0 -
1044# From Eduardo Cota (2004-09-20):
1045# The uruguayan government has decreed a change in the local time....
1046# http://www.presidencia.gub.uy/decretos/2004091502.htm
1047Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1048# From Steffen Thorsen (2005-03-11):
1049# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1050# save energy ... it was postponed two weeks....
1051# http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1052Rule Uruguay 2005 only - Mar 27 2:00 0 -
1053# From Eduardo Cota (2005-09-27):
1054# http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1055# This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1056# 02:00 local time, official time in Uruguay will be at GMT -2.
1057Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1058Rule Uruguay 2006 only - Mar 12 2:00 0 -
1059# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1060Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1061 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1062 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
1063 -3:00 Uruguay UY%sT
1064
1065# Venezuela
1066# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1067Zone America/Caracas -4:27:44 - LMT 1890
1068 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1069 -4:30 - VET 1965 # Venezuela Time
1070 -4:00 - VET
| 3
4# This data is by no means authoritative; if you think you know better,
5# go ahead and edit the file (and please send any changes to
6# tz@elsie.nci.nih.gov for general use in the future).
7
8# From Paul Eggert (1999-07-07):
9# A good source for time zone historical data outside the U.S. is
10# Thomas G. Shanks, The International Atlas (5th edition),
11# San Diego: ACS Publications, Inc. (1999).
12#
13# Gwillim Law writes that a good source
14# for recent time zone data is the International Air Transport
15# Association's Standard Schedules Information Manual (IATA SSIM),
16# published semiannually. Law sent in several helpful summaries
17# of the IATA's data after 1990.
18#
19# Except where otherwise noted, Shanks is the source for entries through 1990,
20# and IATA SSIM is the source for entries after 1990.
21#
22# Earlier editions of these tables used the North American style (e.g. ARST and
23# ARDT for Argentine Standard and Daylight Time), but the following quote
24# suggests that it's better to use European style (e.g. ART and ARST).
25# I suggest the use of _Summer time_ instead of the more cumbersome
26# _daylight-saving time_. _Summer time_ seems to be in general use
27# in Europe and South America.
28# -- E O Cutler, _New York Times_ (1937-02-14), quoted in
29# H L Mencken, _The American Language: Supplement I_ (1960), p 466
30#
31# Earlier editions of these tables also used the North American style
32# for time zones in Brazil, but this was incorrect, as Brazilians say
33# "summer time". Reinaldo Goulart, a Sao Paulo businessman active in
34# the railroad sector, writes (1999-07-06):
35# The subject of time zones is currently a matter of discussion/debate in
36# Brazil. Let's say that "the Brasilia time" is considered the
37# "official time" because Brasilia is the capital city.
38# The other three time zones are called "Brasilia time "minus one" or
39# "plus one" or "plus two". As far as I know there is no such
40# name/designation as "Eastern Time" or "Central Time".
41# So I invented the following (English-language) abbreviations for now.
42# Corrections are welcome!
43# std dst
44# -2:00 FNT FNST Fernando de Noronha
45# -3:00 BRT BRST Brasilia
46# -4:00 AMT AMST Amazon
47# -5:00 ACT ACST Acre
48
49###############################################################################
50
51###############################################################################
52
53# Argentina
54
55# From Bob Devine (1988-01-28):
56# Argentina: first Sunday in October to first Sunday in April since 1976.
57# Double Summer time from 1969 to 1974. Switches at midnight.
58
59# From U. S. Naval Observatory (1988-01-199):
60# ARGENTINA 3 H BEHIND UTC
61
62# From Hernan G. Otero (1995-06-26):
63# I am sending modifications to the Argentine time zone table...
64# AR was chosen because they are the ISO letters that represent Argentina.
65
66# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
67Rule Arg 1930 only - Dec 1 0:00 1:00 S
68Rule Arg 1931 only - Apr 1 0:00 0 -
69Rule Arg 1931 only - Oct 15 0:00 1:00 S
70Rule Arg 1932 1940 - Mar 1 0:00 0 -
71Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
72Rule Arg 1940 only - Jul 1 0:00 1:00 S
73Rule Arg 1941 only - Jun 15 0:00 0 -
74Rule Arg 1941 only - Oct 15 0:00 1:00 S
75Rule Arg 1943 only - Aug 1 0:00 0 -
76Rule Arg 1943 only - Oct 15 0:00 1:00 S
77Rule Arg 1946 only - Mar 1 0:00 0 -
78Rule Arg 1946 only - Oct 1 0:00 1:00 S
79Rule Arg 1963 only - Oct 1 0:00 0 -
80Rule Arg 1963 only - Dec 15 0:00 1:00 S
81Rule Arg 1964 1966 - Mar 1 0:00 0 -
82Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
83Rule Arg 1967 only - Apr 2 0:00 0 -
84Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
85Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
86Rule Arg 1974 only - Jan 23 0:00 1:00 S
87Rule Arg 1974 only - May 1 0:00 0 -
88Rule Arg 1988 only - Dec 1 0:00 1:00 S
89#
90# From Hernan G. Otero (1995-06-26):
91# These corrections were contributed by InterSoft Argentina S.A.,
92# obtaining the data from the:
93# Talleres de Hidrografia Naval Argentina
94# (Argentine Naval Hydrography Institute)
95#
96# Shanks stops after 1992-03-01; go with Otero.
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
110Rule Arg 2000 only - Mar Sun>=1 0:00 0 -
111#
112# From Peter Gradelski via Steffen Thorsen (2000-03-01):
113# We just checked with our Sao Paulo office and they say the government of
114# Argentina decided not to become one of the countries that go on or off DST.
115# So Buenos Aires should be -3 hours from GMT at all times.
116#
117# From Fabian L. Arce Jofre (2000-04-04):
118# The law that claimed DST for Argentina was derogated by President Fernando
119# de la Rua on March 2, 2000, because it would make people spend more energy
120# in the winter time, rather than less. The change took effect on March 3.
121#
122# From Mariano Absatz (2001-06-06):
123# one of the major newspapers here in Argentina said that the 1999
124# Timezone Law (which never was effectively applied) will (would?) be
125# in effect.... The article is at
126# http://ar.clarin.com/diario/2001-06-06/e-01701.htm
127# ... The Law itself is "Ley No 25155", sanctioned on 1999-08-25, enacted
128# 1999-09-17, and published 1999-09-21. The official publication is at:
129# http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
130# Regretfully, you have to subscribe (and pay) for the on-line version....
131#
132# (2001-06-12):
133# the timezone for Argentina will not change next Sunday.
134# Apparently it will do so on Sunday 24th....
135# http://ar.clarin.com/diario/2001-06-12/s-03501.htm
136#
137# (2001-06-25):
138# Last Friday (yes, the last working day before the date of the change), the
139# Senate annulled the 1999 law that introduced the changes later postponed.
140# http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
141# It remains the vote of the Deputies..., but it will be the same....
142# This kind of things had always been done this way in Argentina.
143# We are still -03:00 all year round in all of the country.
144#
145# From Mariano Absatz (2004-05-21):
146# Today it was officially published that the Province of Mendoza is changing
147# its timezone this winter... starting tomorrow night....
148# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
149# From Paul Eggert (2004-05-24):
150# It's Law No. 7,210. This change is due to a public power emergency, so for
151# now we'll assume it's for this year only.
152#
153# From Paul Eggert (2002-01-22):
154# <a href="http://www.spicasc.net/horvera.html">
155# Hora de verano para la Republica Argentina (2000-10-01)
156# </a> says that standard time in Argentina from 1894-10-31
157# to 1920-05-01 was -4:16:48.25. Go with this more-precise value
158# over Shanks.
159#
160# From Mariano Absatz (2004-06-05):
161# These media articles from a major newspaper mostly cover the current state:
162# http://www.lanacion.com.ar/04/05/27/de_604825.asp
163# http://www.lanacion.com.ar/04/05/28/de_605203.asp
164#
165# The following eight (8) provinces pulled clocks back to UTC-04:00 at
166# midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
167# Apparently, all nine provinces would go back to UTC-03:00 at the same
168# time in October 17th.
169#
170# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
171# Tierra del Fuego, Tucuman.
172#
173# From Mariano Absatz (2004-06-14):
174# ... this weekend, the Province of Tucuman decided it'd go back to UTC-03:00
175# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
176# annoyance with the change is much higher than the power savings obtained....
177#
178# From Gwillim Law (2004-06-14):
179# http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
180# "The time change in Tierra del Fuego was a conflicted decision from
181# the start. The government had decreed that the measure would take
182# effect on June 1, but a normative error forced the new time to begin
183# three days earlier, from a Saturday to a Sunday....
184# Our understanding was that the change was originally scheduled to take place
185# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
186# provinces). Sunday was May 30, only two days earlier. So the article
187# contains a contradiction. I would give more credence to the Saturday/Sunday
188# date than the "three days earlier" phrase, and conclude that Tierra del
189# Fuego set its clocks back at 2004-05-30 00:00.
190#
191# From Steffen Thorsen (2004-10-05):
192# The previous law 7210 which changed the province of Mendoza's time zone
193# back in May have been modified slightly in a new law 7277, which set the
194# new end date to 2004-09-26 (original date was 2004-10-17).
195# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
196#
197# From Mariano Absatz (2004-10-05):
198# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
199# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
200# at midnight between Saturday, July 24th and Sunday, July 25th....
201# http://www.sanjuan.gov.ar/prensa/archivo/000329.html
202# http://www.sanjuan.gov.ar/prensa/archivo/000426.html
203# http://www.sanjuan.gov.ar/prensa/archivo/000441.html
204
205# Unless otherwise specified, data are from Shanks through 1992, from
206# the IATA otherwise. As noted below, Shanks says that
207# America/Cordoba split into 6 subregions during 1991/1992, but we
208# haven't verified this yet so for now we'll keep it a single region.
209#
210# Zone NAME GMTOFF RULES FORMAT [UNTIL]
211#
212# Buenos Aires (BA), Capital Federal (CF),
213Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
214 -4:16:48 - CMT 1920 May # Cordoba Mean Time
215 -4:00 - ART 1930 Dec
216 -4:00 Arg AR%sT 1969 Oct 5
217 -3:00 Arg AR%sT 1999 Oct 3
218 -4:00 Arg AR%sT 2000 Mar 3
219 -3:00 - ART
220#
221# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
222# Formosa (FM), Salta (SA), Santiago del Estero (SE), Cordoba (CB),
223# San Luis (SL), La Pampa (LP), Neuquen (NQ), Rio Negro (RN)
224#
225# Shanks also makes the following claims, which we haven't verified:
226# - Formosa switched to -3:00 on 1991-01-07.
227# - Misiones switched to -3:00 on 1990-12-29.
228# - Chaco switched to -3:00 on 1991-01-04.
229# - San Luis switched to -4:00 on 1990-03-14, then to -3:00 on 1990-10-15,
230# then to -4:00 on 1991-03-01, then to -3:00 on 1991-06-01.
231# - Santiago del Estero switched to -4:00 on 1991-04-01,
232# then to -3:00 on 1991-04-26.
233#
234Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31
235 -4:16:48 - CMT 1920 May
236 -4:00 - ART 1930 Dec
237 -4:00 Arg AR%sT 1969 Oct 5
238 -3:00 Arg AR%sT 1991 Mar 3
239 -4:00 - WART 1991 Oct 20
240 -3:00 Arg AR%sT 1999 Oct 3
241 -4:00 Arg AR%sT 2000 Mar 3
242 -3:00 - ART
243#
244# Tucuman (TM)
245Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
246 -4:16:48 - CMT 1920 May
247 -4:00 - ART 1930 Dec
248 -4:00 Arg AR%sT 1969 Oct 5
249 -3:00 Arg AR%sT 1991 Mar 3
250 -4:00 - WART 1991 Oct 20
251 -3:00 Arg AR%sT 1999 Oct 3
252 -4:00 Arg AR%sT 2000 Mar 3
253 -3:00 - ART 2004 Jun 1
254 -4:00 - WART 2004 Jun 13
255 -3:00 - ART
256#
257# La Rioja (LR)
258Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
259 -4:16:48 - CMT 1920 May
260 -4:00 - ART 1930 Dec
261 -4:00 Arg AR%sT 1969 Oct 5
262 -3:00 Arg AR%sT 1991 Mar 1
263 -4:00 - WART 1991 May 7
264 -3:00 Arg AR%sT 1999 Oct 3
265 -4:00 Arg AR%sT 2000 Mar 3
266 -3:00 - ART 2004 Jun 1
267 -4:00 - WART 2004 Jun 20
268 -3:00 - ART
269#
270# San Juan (SJ)
271Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
272 -4:16:48 - CMT 1920 May
273 -4:00 - ART 1930 Dec
274 -4:00 Arg AR%sT 1969 Oct 5
275 -3:00 Arg AR%sT 1991 Mar 1
276 -4:00 - WART 1991 May 7
277 -3:00 Arg AR%sT 1999 Oct 3
278 -4:00 Arg AR%sT 2000 Mar 3
279 -3:00 - ART 2004 May 31
280 -4:00 - WART 2004 Jul 25
281 -3:00 - ART
282#
283# Jujuy (JY)
284Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
285 -4:16:48 - CMT 1920 May
286 -4:00 - ART 1930 Dec
287 -4:00 Arg AR%sT 1969 Oct 5
288 -3:00 Arg AR%sT 1990 Mar 4
289 -4:00 - WART 1990 Oct 28
290 -4:00 1:00 WARST 1991 Mar 17
291 -4:00 - WART 1991 Oct 6
292 -3:00 1:00 ARST 1992
293 -3:00 Arg AR%sT 1999 Oct 3
294 -4:00 Arg AR%sT 2000 Mar 3
295 -3:00 - ART
296#
297# Catamarca (CT), Chubut (CH)
298Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
299 -4:16:48 - CMT 1920 May
300 -4:00 - ART 1930 Dec
301 -4:00 Arg AR%sT 1969 Oct 5
302 -3:00 Arg AR%sT 1991 Mar 3
303 -4:00 - WART 1991 Oct 20
304 -3:00 Arg AR%sT 1999 Oct 3
305 -4:00 Arg AR%sT 2000 Mar 3
306 -3:00 - ART 2004 Jun 1
307 -4:00 - WART 2004 Jun 20
308 -3:00 - ART
309#
310# Mendoza (MZ)
311Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
312 -4:16:48 - CMT 1920 May
313 -4:00 - ART 1930 Dec
314 -4:00 Arg AR%sT 1969 Oct 5
315 -3:00 Arg AR%sT 1990 Mar 4
316 -4:00 - WART 1990 Oct 15
317 -4:00 1:00 WARST 1991 Mar 1
318 -4:00 - WART 1991 Oct 15
319 -4:00 1:00 WARST 1992 Mar 1
320 -4:00 - WART 1992 Oct 18
321 -3:00 Arg AR%sT 1999 Oct 3
322 -4:00 Arg AR%sT 2000 Mar 3
323 -3:00 - ART 2004 May 23
324 -4:00 - WART 2004 Sep 26
325 -3:00 - ART
326#
327# Santa Cruz (SC)
328Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
329 -4:16:48 - CMT 1920 May # Cordoba Mean Time
330 -4:00 - ART 1930 Dec
331 -4:00 Arg AR%sT 1969 Oct 5
332 -3:00 Arg AR%sT 1999 Oct 3
333 -4:00 Arg AR%sT 2000 Mar 3
334 -3:00 - ART 2004 Jun 1
335 -4:00 - WART 2004 Jun 20
336 -3:00 - ART
337#
338# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
339Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
340 -4:16:48 - CMT 1920 May # Cordoba Mean Time
341 -4:00 - ART 1930 Dec
342 -4:00 Arg AR%sT 1969 Oct 5
343 -3:00 Arg AR%sT 1999 Oct 3
344 -4:00 Arg AR%sT 2000 Mar 3
345 -3:00 - ART 2004 May 30
346 -4:00 - WART 2004 Jun 20
347 -3:00 - ART
348
349# Aruba
350# Zone NAME GMTOFF RULES FORMAT [UNTIL]
351Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
352 -4:30 - ANT 1965 # Netherlands Antilles Time
353 -4:00 - AST
354
355# Bolivia
356# Zone NAME GMTOFF RULES FORMAT [UNTIL]
357Zone America/La_Paz -4:32:36 - LMT 1890
358 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
359 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
360 -4:00 - BOT # Bolivia Time
361
362# Brazil
363
364# From Paul Eggert (1993-11-18):
365# The mayor of Rio recently attempted to change the time zone rules
366# just in his city, in order to leave more summer time for the tourist trade.
367# The rule change lasted only part of the day;
368# the federal government refused to follow the city's rules, and business
369# was in a chaos, so the mayor backed down that afternoon.
370
371# From IATA SSIM (1996-02):
372# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
373# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
374# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
375# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
376# [The last three states are new to this issue of the IATA SSIM.]
377
378# From Gwillim Law (1996-10-07):
379# Geography, history (Tocantins was part of Goias until 1989), and other
380# sources of time zone information lead me to believe that AL, SE, and TO were
381# always in BR1, and so the only change was whether or not they observed DST....
382# The earliest issue of the SSIM I have is 2/91. Each issue from then until
383# 9/95 says that DST is observed only in the ten states I quoted from 9/95,
384# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
385# (UTC-4).... The other two time zones given for Brazil are BR3, which is
386# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
387# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
388# become part of the state of Pernambuco). The boundary between BR1 and BR2
389# has never been clearly stated. They've simply been called East and West.
390# However, some conclusions can be drawn from another IATA manual: the Airline
391# Coding Directory, which lists close to 400 airports in Brazil. For each
392# airport it gives a time zone which is coded to the SSIM. From that
393# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
394# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
395# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
396
397# From Marcos Tadeu (1998-09-27):
398# <a href="http://pcdsh01.on.br/verao1.html">
399# Brazilian official page
400# </a>
401
402# From Jesper Norgaard (2000-11-03):
403# [For an official list of which regions in Brazil use which time zones, see:]
404# http://pcdsh01.on.br/Fusbr.htm
405# http://pcdsh01.on.br/Fusbrhv.htm
406
407# From Celso Doria via David Madeo (2002-10-09):
408# The reason for the delay this year has to do with elections in Brazil.
409#
410# Unlike in the United States, elections in Brazil are 100% computerized and
411# the results are known almost immediately. Yesterday, it was the first
412# round of the elections when 115 million Brazilians voted for President,
413# Governor, Senators, Federal Deputies, and State Deputies. Nobody is
414# counting (or re-counting) votes anymore and we know there will be a second
415# round for the Presidency and also for some Governors. The 2nd round will
416# take place on October 27th.
417#
418# The reason why the DST will only begin November 3rd is that the thousands
419# of electoral machines used cannot have their time changed, and since the
420# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
421# the Government decided to postpone DST, instead of changing the Constitution
422# (maybe, for the next elections, it will be possible to change the clock)...
423
424# From Rodrigo Severo (2004-10-04):
425# It's just the biannual change made necessary by the much hyped, supposedly
426# modern Brazilian eletronic voting machines which, apparently, can't deal
427# with a time change between the first and the second rounds of the elections.
428
429# From Paul Eggert (2002-10-10):
430# The official decrees referenced below are mostly taken from
431# <a href="http://pcdsh01.on.br/DecHV.html">
432# Decretos sobre o Horario de Verao no Brasil
433# </a> (2001-09-20, in Portuguese).
434# The official site for all decrees, including those not related to time, is
435# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/principal_ano.htm">
436# Presidencia da Republica, Subchefia para Assuntos Juridicos, Decretos
437# </a> (in Portuguese).
438
439# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
440# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
441# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
442Rule Brazil 1931 only - Oct 3 11:00 1:00 S
443Rule Brazil 1932 1933 - Apr 1 0:00 0 -
444Rule Brazil 1932 only - Oct 3 0:00 1:00 S
445# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
446# revoked DST.
447# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
448# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
449Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
450Rule Brazil 1950 only - Apr 16 1:00 0 -
451Rule Brazil 1951 1952 - Apr 1 0:00 0 -
452# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
453Rule Brazil 1953 only - Mar 1 0:00 0 -
454# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
455# revoked DST.
456# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
457# established DST from 1963-10-23 00:00 to 1964-02-29 00:00
458# in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
459# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
460# extended the above decree to all of the national territory on 12-09.
461Rule Brazil 1963 only - Dec 9 0:00 1:00 S
462# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
463# extended summer time by one day to 1964-03-01 00:00 (start of school).
464Rule Brazil 1964 only - Mar 1 0:00 0 -
465# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
466Rule Brazil 1965 only - Jan 31 0:00 1:00 S
467Rule Brazil 1965 only - Mar 31 0:00 0 -
468# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
469Rule Brazil 1965 only - Dec 1 0:00 1:00 S
470# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
471Rule Brazil 1966 1968 - Mar 1 0:00 0 -
472Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
473# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
474# revoked DST.
475# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
476Rule Brazil 1985 only - Nov 2 0:00 1:00 S
477# Decree 92,310 (1986-01-21)
478# Decree 92,463 (1986-03-13)
479Rule Brazil 1986 only - Mar 15 0:00 0 -
480# Decree 93,316 (1986-10-01)
481Rule Brazil 1986 only - Oct 25 0:00 1:00 S
482Rule Brazil 1987 only - Feb 14 0:00 0 -
483# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
484Rule Brazil 1987 only - Oct 25 0:00 1:00 S
485Rule Brazil 1988 only - Feb 7 0:00 0 -
486# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
487# except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
488Rule Brazil 1988 only - Oct 16 0:00 1:00 S
489Rule Brazil 1989 only - Jan 29 0:00 0 -
490# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
491# with the same exceptions
492Rule Brazil 1989 only - Oct 15 0:00 1:00 S
493Rule Brazil 1990 only - Feb 11 0:00 0 -
494# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
495# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
496# Decree 99,629 (1990-10-19) adds BA, MT.
497Rule Brazil 1990 only - Oct 21 0:00 1:00 S
498Rule Brazil 1991 only - Feb 17 0:00 0 -
499# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
500# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
501Rule Brazil 1991 only - Oct 20 0:00 1:00 S
502Rule Brazil 1992 only - Feb 9 0:00 0 -
503# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
504# adopted by same states.
505Rule Brazil 1992 only - Oct 25 0:00 1:00 S
506Rule Brazil 1993 only - Jan 31 0:00 0 -
507# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
508# adopted by same states, plus AM.
509# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22;
510# web page corrected 2004-01-07) adopted by same states, minus AM.
511# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
512# adopted by same states, plus MT and TO.
513# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
514# adds AL, SE.
515Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
516Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
517Rule Brazil 1996 only - Feb 11 0:00 0 -
518# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
519# adopted by same states, minus AL, SE.
520Rule Brazil 1996 only - Oct 6 0:00 1:00 S
521Rule Brazil 1997 only - Feb 16 0:00 0 -
522# From Daniel C. Sobral (1998-02-12):
523# In 1997, the DS began on October 6. The stated reason was that
524# because international television networks ignored Brazil's policy on DS,
525# they bought the wrong times on satellite for coverage of Pope's visit.
526# This year, the ending date of DS was postponed to March 1
527# to help dealing with the shortages of electric power.
528#
529# Decree 2,317 (1997-09-04), adopted by same states.
530Rule Brazil 1997 only - Oct 6 0:00 1:00 S
531# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
532# (1998-02-10)
533Rule Brazil 1998 only - Mar 1 0:00 0 -
534# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
535# adopted by the same states as before.
536Rule Brazil 1998 only - Oct 11 0:00 1:00 S
537Rule Brazil 1999 only - Feb 21 0:00 0 -
538# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
539# (1999-08-23) adopted by same states.
540# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
541# adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
542Rule Brazil 1999 only - Oct 3 0:00 1:00 S
543Rule Brazil 2000 only - Feb 27 0:00 0 -
544# Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06)
545# adopted by the same states as before.
546# Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13)
547# repeals DST in PE and RR, effective 2000-10-15 00:00.
548# Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17)
549# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
550# Decree <a href="http://pcdsh01.on.br/figuras/HV3916.gif">3,916</a>
551# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
552Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
553Rule Brazil 2001 max - Feb Sun>=15 0:00 0 -
554# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
555# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm"></a>
556Rule Brazil 2002 only - Nov 3 0:00 1:00 S
557# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
558# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm"></a>
559Rule Brazil 2003 only - Oct 19 0:00 1:00 S
560# Decree 5,223 (2004-10-01) reestablishes DST in MT.
561# <a href="http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm"></a>
562Rule Brazil 2004 only - Nov 2 0:00 1:00 S
563# Decree <a href="http://pcdsh01.on.br/DecHV5539.gif">5,539</a> (2005-09-19),
564# adopted by the same states as before.
565Rule Brazil 2005 max - Oct Sun>=15 0:00 1:00 S
566# The latest ruleset listed above says that the following states observe DST:
567# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
568# For dates after mid-2006, the above rules with TO="max" are guesses
569# and are quite possibly wrong, but are more likely than no DST at all.
570
571
572# Zone NAME GMTOFF RULES FORMAT [UNTIL]
573#
574# Fernando de Noronha (administratively part of PE)
575Zone America/Noronha -2:09:40 - LMT 1914
576 -2:00 Brazil FN%sT 1990 Sep 17
577 -2:00 - FNT 1999 Sep 30
578 -2:00 Brazil FN%sT 2000 Oct 15
579 -2:00 - FNT 2001 Sep 13
580 -2:00 Brazil FN%sT 2002 Oct 1
581 -2:00 - FNT
582# Other Atlantic islands have no permanent settlement.
583# These include Trindade and Martin Vaz (administratively part of ES),
584# Atol das Rocas (RN), and Penedos de Sao Pedro e Sao Paulo (PE).
585# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
586# it also included the Penedos.
587#
588# Amapa (AP), east Para (PA)
589# East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu.
590# The division between east and west Para is the river Xingu.
591# In the north a very small part from the river Javary (now Jari I guess,
592# the border with Amapa) to the Amazon, then to the Xingu.
593Zone America/Belem -3:13:56 - LMT 1914
594 -3:00 Brazil BR%sT 1988 Sep 12
595 -3:00 - BRT
596#
597# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
598# Paraiba (PB)
599Zone America/Fortaleza -2:34:00 - LMT 1914
600 -3:00 Brazil BR%sT 1990 Sep 17
601 -3:00 - BRT 1999 Sep 30
602 -3:00 Brazil BR%sT 2000 Oct 22
603 -3:00 - BRT 2001 Sep 13
604 -3:00 Brazil BR%sT 2002 Oct 1
605 -3:00 - BRT
606#
607# Pernambuco (PE) (except Atlantic islands)
608Zone America/Recife -2:19:36 - LMT 1914
609 -3:00 Brazil BR%sT 1990 Sep 17
610 -3:00 - BRT 1999 Sep 30
611 -3:00 Brazil BR%sT 2000 Oct 15
612 -3:00 - BRT 2001 Sep 13
613 -3:00 Brazil BR%sT 2002 Oct 1
614 -3:00 - BRT
615#
616# Tocantins (TO)
617Zone America/Araguaina -3:12:48 - LMT 1914
618 -3:00 Brazil BR%sT 1990 Sep 17
619 -3:00 - BRT 1995 Sep 14
620 -3:00 Brazil BR%sT 2003 Sep 24
621 -3:00 - BRT
622#
623# Alagoas (AL), Sergipe (SE)
624Zone America/Maceio -2:22:52 - LMT 1914
625 -3:00 Brazil BR%sT 1990 Sep 17
626 -3:00 - BRT 1995 Oct 13
627 -3:00 Brazil BR%sT 1996 Sep 4
628 -3:00 - BRT 1999 Sep 30
629 -3:00 Brazil BR%sT 2000 Oct 22
630 -3:00 - BRT 2001 Sep 13
631 -3:00 Brazil BR%sT 2002 Oct 1
632 -3:00 - BRT
633#
634# Bahia (BA)
635# There are too many Salvadors elsewhere, so use America/Bahia instead
636# of America/Salvador.
637Zone America/Bahia -2:34:04 - LMT 1914
638 -3:00 Brazil BR%sT 2003 Sep 24
639 -3:00 - BRT
640#
641# Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
642# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
643# Santa Catarina (SC), Rio Grande do Sul (RS)
644Zone America/Sao_Paulo -3:06:28 - LMT 1914
645 -3:00 Brazil BR%sT 1963 Oct 23 00:00
646 -3:00 1:00 BRST 1964
647 -3:00 Brazil BR%sT
648#
649# Mato Grosso do Sul (MS)
650Zone America/Campo_Grande -3:38:28 - LMT 1914
651 -4:00 Brazil AM%sT
652#
653# Mato Grosso (MT)
654Zone America/Cuiaba -3:44:20 - LMT 1914
655 -4:00 Brazil AM%sT 2003 Sep 24
656 -4:00 - AMT 2004 Oct 1
657 -4:00 Brazil AM%sT
658#
659# west Para (PA), Rondonia (RO)
660# West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem.
661Zone America/Porto_Velho -4:15:36 - LMT 1914
662 -4:00 Brazil AM%sT 1988 Sep 12
663 -4:00 - AMT
664#
665# Roraima (RR)
666Zone America/Boa_Vista -4:02:40 - LMT 1914
667 -4:00 Brazil AM%sT 1988 Sep 12
668 -4:00 - AMT 1999 Sep 30
669 -4:00 Brazil AM%sT 2000 Oct 15
670 -4:00 - AMT
671#
672# east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto
673# The great circle line from Tabatinga to Porto Acre divides
674# east from west Amazonas.
675Zone America/Manaus -4:00:04 - LMT 1914
676 -4:00 Brazil AM%sT 1988 Sep 12
677 -4:00 - AMT 1993 Sep 28
678 -4:00 Brazil AM%sT 1994 Sep 22
679 -4:00 - AMT
680#
681# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
682# Eirunepe, Envira, Ipixuna
683Zone America/Eirunepe -4:39:28 - LMT 1914
684 -5:00 Brazil AC%sT 1988 Sep 12
685 -5:00 - ACT 1993 Sep 28
686 -5:00 Brazil AC%sT 1994 Sep 22
687 -5:00 - ACT
688#
689# Acre (AC)
690Zone America/Rio_Branco -4:31:12 - LMT 1914
691 -5:00 Brazil AC%sT 1988 Sep 12
692 -5:00 - ACT
693
694
695# Chile
696
697# From Eduardo Krell (1995-10-19):
698# The law says to switch to DST at midnight [24:00] on the second SATURDAY
699# of October.... The law is the same for March and October.
700# (1998-09-29):
701# Because of the drought this year, the government decided to go into
702# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
703# (unless there's another dry season next year, I guess).
704
705# From Julio I. Pacheco Troncoso (1999-03-18):
706# Because of the same drought, the government decided to end DST later,
707# on April 3, (one-time change).
708
709# From Gwillim Law (2001-05-04):
710# I came across another article in "La Tercera" about Chilean DST.
711# <http://www.tercera.cl/diario/2000/10/13/t-extras.html>
712# It clearly confirms my earlier suggestion, that DST begins at 22:00
713# on Easter Island.... But it also seems to be saying that the
714# observance of DST in Chile began in 1966, rather than 1969 as
715# ... [Shanks] has it....
716#
717# My translation:
718#
719# "The Chilean Army has announced that summer time will begin tomorrow,
720# Saturday, October 14 in continental Chile, insular Chile, and
721# Antarctica, as provided by Supreme Decree 25 of January 11, 1966.
722# By the preceding, official time in continental Chile and Chilean
723# Antarctic, and official time in Western Insular Chile, which applies
724# to Easter Island and Sala y Gomez Island, will be set forward at
725# midnight and at 22:00, respectively, by 20 minutes."
726
727# From Paul Eggert (2001-05-04):
728# Go with this article in preference to Shanks's 1969 date for modern DST.
729# Assume this rule has been used since DST was introduced in the islands.
730
731# From Paul Eggert (2002-10-24):
732# <http://www.shoa.cl/shoa/faqhoraoficial.htm> gives many details that
733# disagree with the following table, but we haven't had time to compare them.
734
735# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
736Rule Chile 1918 only - Sep 1 0:00 1:00 S
737Rule Chile 1919 only - Jul 2 0:00 0 -
738Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
739Rule Chile 1928 1932 - Apr 1 0:00 0 -
740Rule Chile 1966 1997 - Oct Sun>=9 4:00u 1:00 S
741Rule Chile 1967 1998 - Mar Sun>=9 3:00u 0 -
742Rule Chile 1998 only - Sep 27 4:00u 1:00 S
743Rule Chile 1999 only - Apr 4 3:00u 0 -
744Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S
745Rule Chile 2000 max - Mar Sun>=9 3:00u 0 -
746# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
747# (1996-09) says 1998-03-08. Ignore these.
748# Zone NAME GMTOFF RULES FORMAT [UNTIL]
749Zone America/Santiago -4:42:40 - LMT 1890
750 -4:42:40 - SMT 1910 # Santiago Mean Time
751 -5:00 Chile CL%sT 1932 Sep # Chile Time
752 -4:00 Chile CL%sT
753Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
754 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
755 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
756 -6:00 Chile EAS%sT
757#
758# Sala y Gomez Island is like Pacific/Easter.
759# Other Chilean locations, including Juan Fernandez Is, San Ambrosio,
760# San Felix, and Antarctic bases, are like America/Santiago.
761
762# Colombia
763# Shanks specifies 24:00 for 1992 transition times; go with IATA,
764# as it seems implausible to change clocks at midnight New Year's Eve.
765# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
766Rule CO 1992 only - May 2 0:00 1:00 S
767Rule CO 1992 only - Dec 31 0:00 0 -
768# Zone NAME GMTOFF RULES FORMAT [UNTIL]
769Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
770 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
771 -5:00 CO CO%sT # Colombia Time
772# Malpelo, Providencia, San Andres
773# no information; probably like America/Bogota
774
775# Curacao
776# Shanks says that Bottom and Oranjestad have been at -4:00 since
777# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
778# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
779# This all predates our 1970 cutoff, though.
780# Zone NAME GMTOFF RULES FORMAT [UNTIL]
781Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
782 -4:30 - ANT 1965 # Netherlands Antilles Time
783 -4:00 - AST
784
785# Ecuador
786# Zone NAME GMTOFF RULES FORMAT [UNTIL]
787Zone America/Guayaquil -5:19:20 - LMT 1890
788 -5:14:00 - QMT 1931 # Quito Mean Time
789 -5:00 - ECT # Ecuador Time
790Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
791 -5:00 - ECT 1986
792 -6:00 - GALT # Galapagos Time
793
794# Falklands
795
796# From Paul Eggert (2001-03-05):
797# Between 1990 and 2000 inclusive, Shanks and the IATA agree except
798# the IATA gives 1996-09-08. Go with Shanks.
799
800# From Falkland Islands Government Office, London (2001-01-22)
801# via Jesper Norgaard:
802# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
803# April 2001 and advance one hour to summer time at 2 am on Sunday 2
804# September. It is anticipated that the clocks will revert back at 2
805# am on Sunday 21 April 2002 and advance to summer time at 2 am on
806# Sunday 1 September.
807
808# From Rives McDow (2001-02-13):
809#
810# I have communicated several times with people there, and the last
811# time I had communications that was helpful was in 1998. Here is
812# what was said then:
813#
814# "The general rule was that Stanley used daylight saving and the Camp
815# did not. However for various reasons many people in the Camp have
816# started to use daylight saving (known locally as 'Stanley Time')
817# There is no rule as to who uses daylight saving - it is a matter of
818# personal choice and so it is impossible to draw a map showing who
819# uses it and who does not. Any list would be out of date as soon as
820# it was produced. This year daylight saving ended on April 18/19th
821# and started again on September 12/13th. I do not know what the rule
822# is, but can find out if you like. We do not change at the same time
823# as UK or Chile."
824#
825# I did have in my notes that the rule was "Second Saturday in Sep at
826# 0:00 until third Saturday in Apr at 0:00". I think that this does
827# not agree in some cases with Shanks; is this true?
828#
829# Also, there is no mention in the list that some areas in the
830# Falklands do not use DST. I have found in my communications there
831# that these areas are on the western half of East Falkland and all of
832# West Falkland. Stanley is the only place that consistently observes
833# DST. Again, as in other places in the world, the farmers don't like
834# it. West Falkland is almost entirely sheep farmers.
835#
836# I know one lady there that keeps a list of which farm keeps DST and
837# which doesn't each year. She runs a shop in Stanley, and says that
838# the list changes each year. She uses it to communicate to her
839# customers, catching them when they are home for lunch or dinner.
840
841# From Paul Eggert (2001-03-05):
842# For now, we'll just record the time in Stanley, since we have no
843# better info.
844
845# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
846Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
847Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
848Rule Falk 1939 only - Oct 1 0:00 1:00 S
849Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
850Rule Falk 1943 only - Jan 1 0:00 0 -
851Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
852Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
853Rule Falk 1984 only - Sep 16 0:00 1:00 S
854Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
855Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
856Rule Falk 2001 max - Apr Sun>=15 2:00 0 -
857Rule Falk 2001 max - Sep Sun>=1 2:00 1:00 S
858# Zone NAME GMTOFF RULES FORMAT [UNTIL]
859Zone Atlantic/Stanley -3:51:24 - LMT 1890
860 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
861 -4:00 Falk FK%sT 1983 May # Falkland Is Time
862 -3:00 Falk FK%sT 1985 Sep 15
863 -4:00 Falk FK%sT
864
865# French Guiana
866# Zone NAME GMTOFF RULES FORMAT [UNTIL]
867Zone America/Cayenne -3:29:20 - LMT 1911 Jul
868 -4:00 - GFT 1967 Oct # French Guiana Time
869 -3:00 - GFT
870
871# Guyana
872# Zone NAME GMTOFF RULES FORMAT [UNTIL]
873Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
874 -3:45 - GBGT 1966 May 26 # Br Guiana Time
875 -3:45 - GYT 1975 Jul 31 # Guyana Time
876 -3:00 - GYT 1991
877# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
878 -4:00 - GYT
879
880# Paraguay
881# From Paul Eggert (1999-10-29):
882# Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
883# and autumn transitions are from 00:00 -> 23:00. Go with earlier
884# editions of Shanks, and with the IATA, who say transitions occur at 00:00.
885# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
886Rule Para 1975 1988 - Oct 1 0:00 1:00 S
887Rule Para 1975 1978 - Mar 1 0:00 0 -
888Rule Para 1979 1991 - Apr 1 0:00 0 -
889Rule Para 1989 only - Oct 22 0:00 1:00 S
890Rule Para 1990 only - Oct 1 0:00 1:00 S
891Rule Para 1991 only - Oct 6 0:00 1:00 S
892Rule Para 1992 only - Mar 1 0:00 0 -
893Rule Para 1992 only - Oct 5 0:00 1:00 S
894Rule Para 1993 only - Mar 31 0:00 0 -
895Rule Para 1993 1995 - Oct 1 0:00 1:00 S
896Rule Para 1994 1995 - Feb lastSun 0:00 0 -
897Rule Para 1996 only - Mar 1 0:00 0 -
898# IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
899# From Steffen Thorsen (2000-10-02):
900# I have three independent reports that Paraguay changed to DST this Sunday
901# (10-01).
902#
903# Translated by Gwillim Law (2001-02-27) from
904# <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm">
905# Noticias, a daily paper in Asuncion, Paraguay (2000-10-01)
906# </a>:
907# Starting at 0:00 today, the clock will be set forward 60 minutes, in
908# fulfillment of Decree No. 7,273 of the Executive Power.... The time change
909# system has been operating for several years. Formerly there was a separate
910# decree each year; the new law has the same effect, but permanently. Every
911# year, the time will change on the first Sunday of October; likewise, the
912# clock will be set back on the first Sunday of March.
913#
914# From Jesper Norgaard (2001-03-06) [an official URL saying similar things]:
915# http://gateway.abc.com.py:8000/pub/pag04.mbr/artic?FHA=2001-03-03-02.24.52.900592
916#
917Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
918# IATA SSIM (1997-09) says Mar 1; go with Shanks.
919Rule Para 1997 only - Feb lastSun 0:00 0 -
920# Shanks says 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
921# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
922Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
923# From Rives McDow (2002-02-28):
924# A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the
925# dst method to be from the first Sunday in September to the first Sunday in
926# April.
927Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
928Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
929#
930# From Jesper Norgaard Welen (2005-01-02):
931# There are several sources that claim that Paraguay made
932# a timezone rule change in autumn 2004.
933# From Steffen Thorsen (2005-01-05):
934# Decree 1,867 (2004-03-05) <http://www.labor.com.py/noticias.asp?id=27>
935Rule Para 2004 max - Oct Sun>=15 0:00 1:00 S
936Rule Para 2005 max - Mar Sun>=8 0:00 0 -
937
938# Zone NAME GMTOFF RULES FORMAT [UNTIL]
939Zone America/Asuncion -3:50:40 - LMT 1890
940 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
941 -4:00 - PYT 1972 Oct # Paraguay Time
942 -3:00 - PYT 1974 Apr
943 -4:00 Para PY%sT
944
945# Peru
946#
947# <a href="news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net">
948# From Evelyn C. Leeper via Mark Brader (2003-10-26):</a>
949# When we were in Peru in 1985-1986, they apparently switched over
950# sometime between December 29 and January 3 while we were on the Amazon.
951#
952# From Paul Eggert (2003-11-02):
953# Shanks doesn't have this transition. Assume 1986 was like 1987.
954
955# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
956Rule Peru 1938 only - Jan 1 0:00 1:00 S
957Rule Peru 1938 only - Apr 1 0:00 0 -
958Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
959Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
960Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
961Rule Peru 1986 1987 - Apr 1 0:00 0 -
962Rule Peru 1990 only - Jan 1 0:00 1:00 S
963Rule Peru 1990 only - Apr 1 0:00 0 -
964# IATA is ambiguous for 1993/1995; go with Shanks.
965Rule Peru 1994 only - Jan 1 0:00 1:00 S
966Rule Peru 1994 only - Apr 1 0:00 0 -
967# Zone NAME GMTOFF RULES FORMAT [UNTIL]
968Zone America/Lima -5:08:12 - LMT 1890
969 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
970 -5:00 Peru PE%sT # Peru Time
971
972# South Georgia
973# Zone NAME GMTOFF RULES FORMAT [UNTIL]
974Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
975 -2:00 - GST # South Georgia Time
976
977# South Sandwich Is
978# uninhabited; scientific personnel have wintered
979
980# Suriname
981# Zone NAME GMTOFF RULES FORMAT [UNTIL]
982Zone America/Paramaribo -3:40:40 - LMT 1911
983 -3:40:52 - PMT 1935 # Paramaribo Mean Time
984 -3:40:36 - PMT 1945 Oct # The capital moved?
985 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
986 -3:30 - SRT 1984 Oct # Suriname Time
987 -3:00 - SRT
988
989# Trinidad and Tobago
990# Zone NAME GMTOFF RULES FORMAT [UNTIL]
991Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
992 -4:00 - AST
993
994# Uruguay
995# From Paul Eggert (1993-11-18):
996# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
997# From Shanks:
998# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
999# Whitman gives 1923 Oct 1; go with Shanks.
1000Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1001Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1002Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1003Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1004# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
1005Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1006Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1007Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1008# Whitman gives 1937 Oct 3; go with Shanks.
1009Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1010# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1011# and 1943 Apr 13 ``to present time''; go with Shanks.
1012Rule Uruguay 1941 only - Aug 1 0:00 0 -
1013Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
1014Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1015Rule Uruguay 1943 only - Mar 14 0:00 0 -
1016Rule Uruguay 1959 only - May 24 0:00 1:00 S
1017Rule Uruguay 1959 only - Nov 15 0:00 0 -
1018Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1019Rule Uruguay 1960 only - Mar 6 0:00 0 -
1020Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1021Rule Uruguay 1965 only - Sep 26 0:00 0 -
1022Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1023Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1024Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1025Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1026Rule Uruguay 1972 only - Aug 15 0:00 0 -
1027Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1028Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1029Rule Uruguay 1976 only - Oct 1 0:00 0 -
1030Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1031Rule Uruguay 1978 only - Apr 1 0:00 0 -
1032Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1033Rule Uruguay 1980 only - May 1 0:00 0 -
1034Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1035Rule Uruguay 1988 only - Mar 14 0:00 0 -
1036Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1037Rule Uruguay 1989 only - Mar 12 0:00 0 -
1038Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1039# Shanks says no DST was observed in 1990/1 and 1991/2,
1040# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1041Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1042Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1043Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1044Rule Uruguay 1993 only - Feb 28 0:00 0 -
1045# From Eduardo Cota (2004-09-20):
1046# The uruguayan government has decreed a change in the local time....
1047# http://www.presidencia.gub.uy/decretos/2004091502.htm
1048Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1049# From Steffen Thorsen (2005-03-11):
1050# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1051# save energy ... it was postponed two weeks....
1052# http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1053Rule Uruguay 2005 only - Mar 27 2:00 0 -
1054# From Eduardo Cota (2005-09-27):
1055# http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1056# This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1057# 02:00 local time, official time in Uruguay will be at GMT -2.
1058Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1059Rule Uruguay 2006 only - Mar 12 2:00 0 -
1060# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1061Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1062 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1063 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
1064 -3:00 Uruguay UY%sT
1065
1066# Venezuela
1067# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1068Zone America/Caracas -4:27:44 - LMT 1890
1069 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1070 -4:30 - VET 1965 # Venezuela Time
1071 -4:00 - VET
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