1# @(#)southamerica 7.40
2
3# $FreeBSD: head/share/zoneinfo/southamerica 75267 2001-04-06 16:46:52Z wollman $
4
5# This data is by no means authoritative; if you think you know better,
6# go ahead and edit the file (and please send any changes to
7# tz@elsie.nci.nih.gov for general use in the future).
8
9# From Paul Eggert <eggert@twinsun.com> (1999-07-07):
10# A good source for time zone historical data outside the U.S. is
11# Thomas G. Shanks, The International Atlas (5th edition),
12# San Diego: ACS Publications, Inc. (1999).
13#
14# Gwillim Law <Gwil_Law@bridge-point.com> writes that a good source
15# for recent time zone data is the International Air Transport
16# Association's Standard Schedules Information Manual (IATA SSIM),
17# published semiannually. Law sent in several helpful summaries
18# of the IATA's data after 1990.
19#
20# Except where otherwise noted, Shanks is the source for entries through 1990,
21# and IATA SSIM is the source for entries after 1990.
22#
23# Earlier editions of these tables used the North American style (e.g. ARST and
24# ARDT for Argentine Standard and Daylight Time), but the following quote
25# suggests that it's better to use European style (e.g. ART and ARST).
26# I suggest the use of _Summer time_ instead of the more cumbersome
27# _daylight-saving time_. _Summer time_ seems to be in general use
28# in Europe and South America.
29# -- E O Cutler, _New York Times_ (1937-02-14), quoted in
30# H L Mencken, _The American Language: Supplement I_ (1960), p 466
31#
32# Earlier editions of these tables also used the North American style
33# for time zones in Brazil, but this was incorrect, as Brazilians say
34# "summer time". Reinaldo Goulart, a Sao Paulo businessman active in
35# the railroad sector, writes (1999-07-06):
36# The subject of time zones is currently a matter of discussion/debate in
37# Brazil. Let's say that "the Brasilia time" is considered the
38# "official time" because Brasilia is the capital city.
39# The other three time zones are called "Brasilia time "minus one" or
40# "plus one" or "plus two". As far as I know there is no such
41# name/designation as "Eastern Time" or "Central Time".
42# So I invented the following (English-language) abbreviations for now.
43# Corrections are welcome!
44# std dst
45# -2:00 FNT FNST Fernando de Noronha
46# -3:00 BRT BRST Brasilia
47# -4:00 AMT AMST Amazon
48# -5:00 ACT ACST Acre
49
50###############################################################################
51
52###############################################################################
53
54# Argentina
55
56# From Bob Devine (1988-01-28):
57# Argentina: first Sunday in October to first Sunday in April since 1976.
58# Double Summer time from 1969 to 1974. Switches at midnight.
59
60# From U. S. Naval Observatory (1988-01-199):
61# ARGENTINA 3 H BEHIND UTC
62
63# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
64# I am sending modifications to the Argentine time zone table...
65# AR was chosen because they are the ISO letters that represent Argentina.
66
67# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
68Rule Arg 1930 only - Dec 1 0:00 1:00 S
69Rule Arg 1931 only - Apr 1 0:00 0 -
70Rule Arg 1931 only - Oct 15 0:00 1:00 S
71Rule Arg 1932 1940 - Mar 1 0:00 0 -
72Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
73Rule Arg 1940 only - Jul 1 0:00 1:00 S
74Rule Arg 1941 only - Jun 15 0:00 0 -
75Rule Arg 1941 only - Oct 15 0:00 1:00 S
76Rule Arg 1943 only - Aug 1 0:00 0 -
77Rule Arg 1943 only - Oct 15 0:00 1:00 S
78Rule Arg 1946 only - Mar 1 0:00 0 -
79Rule Arg 1946 only - Oct 1 0:00 1:00 S
80Rule Arg 1963 only - Oct 1 0:00 0 -
81Rule Arg 1963 only - Dec 15 0:00 1:00 S
82Rule Arg 1964 1966 - Mar 1 0:00 0 -
83Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
84Rule Arg 1967 only - Apr 1 0:00 0 -
85Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
86Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
87Rule Arg 1974 only - Jan 23 0:00 1:00 S
88Rule Arg 1974 only - May 1 0:00 0 -
89Rule Arg 1974 1976 - Oct Sun>=1 0:00 1:00 S
90Rule Arg 1975 1977 - Apr Sun>=1 0:00 0 -
91Rule Arg 1985 only - Nov 2 0:00 1:00 S
92Rule Arg 1986 only - Mar 14 0:00 0 -
93Rule Arg 1986 1987 - Oct 25 0:00 1:00 S
94Rule Arg 1987 only - Feb 13 0:00 0 -
95Rule Arg 1988 only - Feb 7 0:00 0 -
96Rule Arg 1988 only - Dec 1 0:00 1:00 S
97#
98# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
99# These corrections were contributed by InterSoft Argentina S.A.,
100# obtaining the data from the:
101# Talleres de Hidrografia Naval Argentina
102# (Argentine Naval Hydrography Institute)
103#
104# Shanks stops after 1992-03-01; go with Otero.
105Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
106Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
107#
108# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
109# From this moment on, the law that mandated the daylight saving
110# time corrections was derogated and no more modifications
111# to the time zones (for daylight saving) are now made.
112#
113# From Rives McDow (2000-01-10):
114# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
115# which did not result in the switch of a time zone, as they stayed 9 hours
116# from the International Date Line.
117Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
118Rule Arg 2000 only - Mar Sun>=1 0:00 0 -
119#
120# From Peter Gradelski via Steffen Thorsen (2000-03-01):
121# We just checked with our Sao Paulo office and they say the government of
122# Argentina decided not to become one of the countries that go on or off DST.
123# So Buenos Aires should be -3 hours from GMT at all times.
124#
125# From Fabian L. Arce Jofre <farcejofre@bigfoot.com> (2000-04-04):
126# The law that claimed DST for Argentina was derogated by President Fernando
127# de la Rua on March 2, 2000, because it would make people spend more energy
128# in the winter time, rather than less. The change took effect on March 3.
129#
130# Zone NAME GMTOFF RULES FORMAT [UNTIL]
131#
132# Buenos Aires (BA), Capital Federal (CF), Santa Cruz (SC),
133# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
134Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
135 -4:16:44 - CMT 1920 May # Cordoba Mean Time
136 -4:00 - ART 1930 Dec
137 -4:00 Arg AR%sT 1969 Oct 5
138 -3:00 Arg AR%sT 1999 Oct 3 0:00
139 -4:00 Arg AR%sT 2000 Mar 3 0:00
140 -3:00 - ART
141#
142# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
143# Formosa (FM), La Pampa (LP), Chubut (CH)
144Zone America/Rosario -4:02:40 - LMT 1894 Nov
145 -4:16:44 - CMT 1920 May
146 -4:00 - ART 1930 Dec
147 -4:00 Arg AR%sT 1969 Oct 5
148 -3:00 Arg AR%sT 1991 Jul
149 -3:00 - ART 1999 Oct 3 0:00
150 -4:00 Arg AR%sT 2000 Mar 3 0:00
151 -3:00 - ART
152#
153# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL),
154# Neuquen (NQ), Rio Negro (RN)
155Zone America/Cordoba -4:16:44 - LMT 1894 Nov
156 -4:16:44 - CMT 1920 May
157 -4:00 - ART 1930 Dec
158 -4:00 Arg AR%sT 1969 Oct 5
159 -3:00 Arg AR%sT 1990 Jul
160 -3:00 - ART 1999 Oct 3 0:00
161 -4:00 Arg AR%sT 2000 Mar 3 0:00
162 -3:00 - ART
163#
164# Jujuy (JY)
165Zone America/Jujuy -4:21:12 - LMT 1894 Nov
166 -4:16:44 - CMT 1920 May
167 -4:00 - ART 1930 Dec
168 -4:00 Arg AR%sT 1969 Oct 5
169 -3:00 Arg AR%sT 1991 Mar 3
170 -4:00 - WART 1991 Oct 6
171 -4:00 1:00 WARST 1992 Mar 15
172 -4:00 - WART 1992 Oct 18
173 -3:00 - ART 1999 Oct 3 0:00
174 -4:00 Arg AR%sT 2000 Mar 3 0:00
175 -3:00 - ART
176#
177# Catamarca (CT)
178Zone America/Catamarca -4:23:08 - LMT 1894 Nov
179 -4:16:44 - CMT 1920 May
180 -4:00 - ART 1930 Dec
181 -4:00 Arg AR%sT 1969 Oct 5
182 -3:00 Arg AR%sT 1990 Jul
183 -3:00 - ART 1991 Jul
184 -3:00 Arg AR%sT 1992 Jul
185 -3:00 - ART 1999 Oct 3 0:00
186 -4:00 Arg AR%sT 2000 Mar 3 0:00
187 -3:00 - ART
188#
189# Mendoza (MZ)
190Zone America/Mendoza -4:35:16 - LMT 1894 Nov
191 -4:16:44 - CMT 1920 May
192 -4:00 - ART 1930 Dec
193 -4:00 Arg AR%sT 1969 Oct 5
194 -3:00 Arg AR%sT 1991 Mar 3
195 -4:00 - WART 1991 Oct 15
196 -4:00 1:00 WARST 1992 Mar 1
197 -4:00 - WART 1992 Oct 18
198 -3:00 - ART 1999 Oct 3 0:00
199 -4:00 Arg AR%sT 2000 Mar 3 0:00
200 -3:00 - ART
201
202# Aruba
203# Zone NAME GMTOFF RULES FORMAT [UNTIL]
204Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
205 -4:30 - ANT 1965 # Netherlands Antilles Time
206 -4:00 - AST
207
208# Bolivia
209# Zone NAME GMTOFF RULES FORMAT [UNTIL]
210Zone America/La_Paz -4:32:36 - LMT 1890
211 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time
212 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
213 -4:00 - BOT # Bolivia Time
214
215# Brazil
216
217# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
218# The mayor of Rio recently attempted to change the time zone rules
219# just in his city, in order to leave more summer time for the tourist trade.
220# The rule change lasted only part of the day;
221# the federal government refused to follow the city's rules, and business
222# was in a chaos, so the mayor backed down that afternoon.
223
224# From IATA SSIM (1996-02):
225# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
226# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
227# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
228# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
229# [The last three states are new to this issue of the IATA SSIM.]
230
231# From Gwillim Law (1996-10-07):
232# Geography, history (Tocantins was part of Goias until 1989), and other
233# sources of time zone information lead me to believe that AL, SE, and TO were
234# always in BR1, and so the only change was whether or not they observed DST....
235# The earliest issue of the SSIM I have is 2/91. Each issue from then until
236# 9/95 says that DST is observed only in the ten states I quoted from 9/95,
237# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
238# (UTC-4).... The other two time zones given for Brazil are BR3, which is
239# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
240# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
241# become part of the state of Pernambuco). The boundary between BR1 and BR2
242# has never been clearly stated. They've simply been called East and West.
243# However, some conclusions can be drawn from another IATA manual: the Airline
244# Coding Directory, which lists close to 400 airports in Brazil. For each
245# airport it gives a time zone which is coded to the SSIM. From that
246# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
247# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
248# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
249
250# From Marcos Tadeu (1998-09-27):
251# <a href="http://pcdsh01.on.br/verao1.html">
252# Brazilian official page
253# </a>
254
255# From Jesper Norgaard (2000-11-03):
256# [For an official list of which regions in Brazil use which time zones, see:]
257# http://pcdsh01.on.br/Fusbr.htm
258# http://pcdsh01.on.br/Fusbrhv.htm
259
260# From Paul Eggert (2000-10-02):
261# The official decrees referenced below are taken from
262# <a href="http://pcdsh01.on.br/DecHV.html">
263# Decretos sobre o Horario de Verao no Brasil
264# </a> (1999-10-04, in Portuguese).
265# The official site for all decrees, including those not related to time, is
266# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/principal_ano.htm">
267# Presidencia da Republica, Subchefia para Assuntos Juridicos, Decretos
268# </a> (in Portuguese).
269
270# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
271# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
272# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
273Rule Brazil 1931 only - Oct 3 11:00 1:00 S
274Rule Brazil 1932 1933 - Apr 1 0:00 0 -
275Rule Brazil 1932 only - Oct 3 0:00 1:00 S
276# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
277# revoked DST.
278# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
279# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
280Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
281Rule Brazil 1950 only - Apr 16 1:00 0 -
282Rule Brazil 1951 1952 - Apr 1 0:00 0 -
283# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
284Rule Brazil 1953 only - Mar 1 0:00 0 -
285# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
286# revoked DST.
287# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
288# established DST from 1963-10-23 00:00 to 1964-02-29 00:00
289# in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
290# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
291# extended the above decree to all of the national territory on 12-09.
292Rule Brazil 1963 only - Dec 9 0:00 1:00 S
293# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
294# extended summer time by one day to 1964-03-01 00:00 (start of school).
295Rule Brazil 1964 only - Mar 1 0:00 0 -
296# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
297Rule Brazil 1965 only - Jan 31 0:00 1:00 S
298Rule Brazil 1965 only - Mar 31 0:00 0 -
299# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
300Rule Brazil 1965 only - Dec 1 0:00 1:00 S
301# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
302Rule Brazil 1966 1968 - Mar 1 0:00 0 -
303Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
304# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
305# revoked DST.
306# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
307Rule Brazil 1985 only - Nov 2 0:00 1:00 S
308# Decree 92,310 (1986-01-21)
309# Decree 92,463 (1986-03-13)
310Rule Brazil 1986 only - Mar 15 0:00 0 -
311# Decree 93,316 (1986-10-01)
312Rule Brazil 1986 only - Oct 25 0:00 1:00 S
313Rule Brazil 1987 only - Feb 14 0:00 0 -
314# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
315Rule Brazil 1987 only - Oct 25 0:00 1:00 S
316Rule Brazil 1988 only - Feb 7 0:00 0 -
317# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
318# except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
319Rule Brazil 1988 only - Oct 16 0:00 1:00 S
320Rule Brazil 1989 only - Jan 29 0:00 0 -
321# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
322# with the same exceptions
323Rule Brazil 1989 only - Oct 15 0:00 1:00 S
324Rule Brazil 1990 only - Feb 11 0:00 0 -
325# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
326# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
327# Decree 99,629 (1990-10-19) adds BA, MT.
328Rule Brazil 1990 only - Oct 21 0:00 1:00 S
329Rule Brazil 1991 only - Feb 17 0:00 0 -
330# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
331# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
332Rule Brazil 1991 only - Oct 20 0:00 1:00 S
333Rule Brazil 1992 only - Feb 9 0:00 0 -
334# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
335# adopted by same states.
336Rule Brazil 1992 only - Oct 25 0:00 1:00 S
337Rule Brazil 1993 only - Jan 31 0:00 0 -
338# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
339# adopted by same states, plus AM.
340# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22)
341# adopted by same states, minus AM.
342# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
343# adopted by same states, plus TO.
344# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
345# adds AL, SE.
346Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
347Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
348Rule Brazil 1996 only - Feb 11 0:00 0 -
349# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
350# adopted by same states, minus AL, SE.
351Rule Brazil 1996 only - Oct 6 0:00 1:00 S
352Rule Brazil 1997 only - Feb 16 0:00 0 -
353# From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12):
354# In 1997, the DS began on October 6. The stated reason was that
355# because international television networks ignored Brazil's policy on DS,
356# they bought the wrong times on satellite for coverage of Pope's visit.
357# This year, the ending date of DS was postponed to March 1
358# to help dealing with the shortages of electric power.
359#
360# From Paul Eggert (1998-02-25):
361# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm">
362# Brazil Prepares for Papal Visit
363# </a>,
364# Church Net UK (1997-10-02).
365#
366# Decree 2,317 (1997-09-04), adopted by same states.
367Rule Brazil 1997 only - Oct 6 0:00 1:00 S
368# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
369# (1998-02-10)
370Rule Brazil 1998 only - Mar 1 0:00 0 -
371# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
372# adopted by the same states as before.
373Rule Brazil 1998 only - Oct 11 0:00 1:00 S
374Rule Brazil 1999 only - Feb 21 0:00 0 -
375# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
376# (1999-08-23) adopted by same states.
377# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
378# adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
379Rule Brazil 1999 only - Oct 3 0:00 1:00 S
380Rule Brazil 2000 only - Feb 27 0:00 0 -
381# Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06)
382# adopted by the same states as before.
383# Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13)
384# repeals DST in PE and RR, effective 2000-10-15 00:00.
385# Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17)
386# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
387#
388# These give only one year's rules. After that, the rules are guesses
389# and are quite possibly wrong, but are more likely than no DST at all.
390Rule Brazil 2000 max - Oct Sun>=8 0:00 1:00 S
391Rule Brazil 2001 max - Feb Sun>=15 0:00 0 -
392
393
394# Zone NAME GMTOFF RULES FORMAT [UNTIL]
395#
396# Atlantic islands: Fernando de Noronha, Trindade, Martin Vaz,
397# Atol das Rocas, and Penedos de Sao Pedro e Sao Paulo
398Zone America/Noronha -2:09:40 - LMT 1914
399 -2:00 Brazil FN%sT 1990 Sep 17
400 -2:00 - FNT
401#
402# Amapa (AP), east Para (PA)
403# East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu.
404Zone America/Belem -3:13:56 - LMT 1914
405 -3:00 Brazil BR%sT 1988 Sep 12
406 -3:00 - BRT
407#
408# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
409# Paraiba (PB)
410Zone America/Fortaleza -2:34:00 - LMT 1914
411 -3:00 Brazil BR%sT 1990 Sep 17
412 -3:00 - BRT 1999 Sep 30
413 -3:00 Brazil BR%sT 2000 Oct 22
414 -3:00 - BRT
415#
416# Pernambuco (PE) (except Atlantic islands)
417Zone America/Recife -2:19:36 - LMT 1914
418 -3:00 Brazil BR%sT 1990 Sep 17
419 -3:00 - BRT 1999 Sep 30
420 -3:00 Brazil BR%sT 2000 Oct 15
421 -3:00 - BRT
422#
423# Tocantins (TO)
424Zone America/Araguaina -3:12:48 - LMT 1914
425 -3:00 Brazil BR%sT 1990 Sep 17
426 -3:00 - BRT 1995 Sep 14
427 -3:00 Brazil BR%sT
428#
429# Alagoas (AL), Sergipe (SE)
430Zone America/Maceio -2:22:52 - LMT 1914
431 -3:00 Brazil BR%sT 1990 Sep 17
432 -3:00 - BRT 1995 Oct 13
433 -3:00 Brazil BR%sT 1996 Sep 4
434 -3:00 - BRT 1999 Sep 30
435 -3:00 Brazil BR%sT 2000 Oct 22
436 -3:00 - BRT
437#
438# Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
439# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
440# Santa Catarina (SC), Rio Grande do Sul (RS)
441Zone America/Sao_Paulo -3:06:28 - LMT 1914
442 -3:00 Brazil BR%sT 1963 Oct 23 00:00
443 -3:00 1:00 BRST 1964
444 -3:00 Brazil BR%sT
445#
446# Mato Grosso, Mato Grosso do Sul
447Zone America/Cuiaba -3:44:20 - LMT 1914
448 -4:00 Brazil AM%sT
449#
450# west Para (PA), Rondonia (RO)
451# West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem.
452Zone America/Porto_Velho -4:15:36 - LMT 1914
453 -4:00 Brazil AM%sT 1988 Sep 12
454 -4:00 - AMT
455#
456# Roraima (RR)
457Zone America/Boa_Vista -4:02:40 - LMT 1914
458 -4:00 Brazil AM%sT 1988 Sep 12
459 -4:00 - AMT 1999 Sep 30
460 -4:00 Brazil AM%sT 2000 Oct 15
461 -4:00 - AMT
462#
463# east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto
464Zone America/Manaus -4:00:04 - LMT 1914
465 -4:00 Brazil AM%sT 1988 Sep 12
466 -4:00 - AMT 1993 Sep 28
467 -4:00 Brazil AM%sT 1994 Sep 22
468 -4:00 - AMT
469#
470# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
471# Eirunepe, Envira, Ipixuna
472Zone America/Eirunepe -4:39:28 - LMT 1914
473 -5:00 Brazil AC%sT 1988 Sep 12
474 -5:00 - ACT 1993 Sep 28
475 -5:00 Brazil AC%sT 1994 Sep 22
476 -5:00 - ACT
477#
478# Acre (AC)
479Zone America/Rio_Branco -4:31:12 - LMT 1914
480 -5:00 Brazil AC%sT 1988 Sep 12
481 -5:00 - ACT
482
483
484# Chile
485
486# From Eduardo Krell (1995-10-19):
487# The law says to switch to DST at midnight [24:00] on the second SATURDAY
488# of October.... The law is the same for March and October.
489# (1998-09-29):
490# Because of the drought this year, the government decided to go into
491# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
492# (unless there's another dry season next year, I guess).
493
494# From Julio I. Pacheco Troncoso (1999-03-18):
495# Because of the same drought, the government decided to end DST later,
496# on April 3, (one-time change).
497
498# From Gwillim Law (2001-02-20):
499# I came across a Chilean on-line newspaper, La Tercera. Its
500# <a href="http://www.tercera.cl/diario/1998/03/13/extras.html">
501# 1998-03-13 issue
502# </a>, says (my translation):
503# "At 24:00 (midnight) tomorrow (Saturday) - 22:00 in the insular
504# territory [Easter Island, Juan Fernandez, etc.] - winter time will
505# begin in the entire country."
506
507# From Paul Eggert (2001-02-21):
508# Assume this rule has been used since DST was introduced in the islands.
509
510# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
511Rule Chile 1918 only - Sep 1 0:00 1:00 S
512Rule Chile 1919 only - Jul 2 0:00 0 -
513Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
514Rule Chile 1928 1932 - Apr 1 0:00 0 -
515Rule Chile 1969 1997 - Oct Sun>=9 4:00u 1:00 S
516Rule Chile 1970 1998 - Mar Sun>=9 3:00u 0 -
517Rule Chile 1998 only - Sep 27 4:00u 1:00 S
518Rule Chile 1999 only - Apr 4 3:00u 0 -
519Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S
520Rule Chile 2000 max - Mar Sun>=9 3:00u 0 -
521# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
522# (1996-09) says 1998-03-08. Ignore these.
523# Zone NAME GMTOFF RULES FORMAT [UNTIL]
524Zone America/Santiago -4:42:40 - LMT 1890
525 -4:42:40 - SMT 1910 # Santiago Mean Time
526 -5:00 Chile CL%sT 1932 Sep # Chile Time
527 -4:00 Chile CL%sT
528Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
529 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
530 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
531 -6:00 Chile EAS%sT
532#
533# Whitman says Juan Fernandez Is are like America/Santiago.
534# San Ambrosio, San Felix
535# no information; probably like America/Santiago
536
537
538# Colombia
539# Shanks specifies 24:00 for 1992 transition times; go with IATA,
540# as it seems implausible to change clocks at midnight New Year's Eve.
541# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
542Rule CO 1992 only - May 2 0:00 1:00 S
543Rule CO 1992 only - Dec 31 0:00 0 -
544# Zone NAME GMTOFF RULES FORMAT [UNTIL]
545Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
546 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
547 -5:00 CO CO%sT # Colombia Time
548# Malpelo, Providencia, San Andres
549# no information; probably like America/Bogota
550
551# Curacao
552# Shanks says that Bottom and Oranjestad have been at -4:00 since
553# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
554# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
555# This all predates our 1970 cutoff, though.
556# Zone NAME GMTOFF RULES FORMAT [UNTIL]
557Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
558 -4:30 - ANT 1965 # Netherlands Antilles Time
559 -4:00 - AST
560
561# Ecuador
562# Zone NAME GMTOFF RULES FORMAT [UNTIL]
563Zone America/Guayaquil -5:19:20 - LMT 1890
564 -5:14:00 - QMT 1931 # Quito Mean Time
565 -5:00 - ECT # Ecuador Time
566Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
567 -5:00 - ECT 1986
568 -6:00 - GALT # Galapagos Time
569
570# Falklands
571
572# From Paul Eggert (2001-03-05):
573# Between 1990 and 2000 inclusive, Shanks and the IATA agree except
574# the IATA gives 1996-09-08. Go with Shanks.
575
576# From Falkland Islands Government Office, London (2001-01-22)
577# via Jesper Norgaard:
578# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
579# April 2001 and advance one hour to summer time at 2 am on Sunday 2
580# September. It is anticipated that the clocks will revert back at 2
581# am on Sunday 21 April 2002 and advance to summer time at 2 am on
582# Sunday 1 September.
583
584# From Rives McDow (2001-02-13):
585#
586# I have communicated several times with people there, and the last
587# time I had communications that was helpful was in 1998. Here is
588# what was said then:
589#
590# "The general rule was that Stanley used daylight saving and the Camp
591# did not. However for various reasons many people in the Camp have
592# started to use daylight saving (known locally as 'Stanley Time')
593# There is no rule as to who uses daylight saving - it is a matter of
594# personal choice and so it is impossible to draw a map showing who
595# uses it and who does not. Any list would be out of date as soon as
596# it was produced. This year daylight saving ended on April 18/19th
597# and started again on September 12/13th. I do not know what the rule
598# is, but can find out if you like. We do not change at the same time
599# as UK or Chile."
600#
601# I did have in my notes that the rule was "Second Saturday in Sep at
602# 0:00 until third Saturday in Apr at 0:00". I think that this does
603# not agree in some cases with Shanks; is this true?
604#
605# Also, there is no mention in the list that some areas in the
606# Falklands do not use DST. I have found in my communications there
607# that these areas are on the western half of East Falkland and all of
608# West Falkland. Stanley is the only place that consistently observes
609# DST. Again, as in other places in the world, the farmers don't like
610# it. West Falkland is almost entirely sheep farmers.
611#
612# I know one lady there that keeps a list of which farm keeps DST and
613# which doesn't each year. She runs a shop in Stanley, and says that
614# the list changes each year. She uses it to communicate to her
615# customers, catching them when they are home for lunch or dinner.
616
617# From Paul Eggert (2001-03-05):
618# For now, we'll just record the time in Stanley, since we have no
619# better info.
620
621# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
622Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
623Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
624Rule Falk 1939 only - Oct 1 0:00 1:00 S
625Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
626Rule Falk 1943 only - Jan 1 0:00 0 -
627Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
628Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
629Rule Falk 1984 only - Sep 16 0:00 1:00 S
630Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
631Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
632Rule Falk 2001 max - Apr Sun>=15 2:00 0 -
633Rule Falk 2001 max - Sep Sun>=1 2:00 1:00 S
634# Zone NAME GMTOFF RULES FORMAT [UNTIL]
635Zone Atlantic/Stanley -3:51:24 - LMT 1890
636 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
637 -4:00 Falk FK%sT 1983 May # Falkland Is Time
638 -3:00 Falk FK%sT 1985 Sep 15
639 -4:00 Falk FK%sT
640
641# French Guiana
642# Zone NAME GMTOFF RULES FORMAT [UNTIL]
643Zone America/Cayenne -3:29:20 - LMT 1911 Jul
644 -4:00 - GFT 1967 Oct # French Guiana Time
645 -3:00 - GFT
646
647# Guyana
648# Zone NAME GMTOFF RULES FORMAT [UNTIL]
649Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
650 -3:45 - GBGT 1966 May 26 # Br Guiana Time
651 -3:45 - GYT 1975 Jul 31 # Guyana Time
652 -3:00 - GYT 1991
653# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
654 -4:00 - GYT
655
656# Paraguay
657# From Paul Eggert (1999-10-29):
658# Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
659# and autumn transitions are from 00:00 -> 23:00. Go with earlier
660# editions of Shanks, and with the IATA, who say transitions occur at 00:00.
661# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
662Rule Para 1975 1988 - Oct 1 0:00 1:00 S
663Rule Para 1975 1978 - Mar 1 0:00 0 -
664Rule Para 1979 1991 - Apr 1 0:00 0 -
665Rule Para 1989 only - Oct 22 0:00 1:00 S
666Rule Para 1990 only - Oct 1 0:00 1:00 S
667Rule Para 1991 only - Oct 6 0:00 1:00 S
668Rule Para 1992 only - Mar 1 0:00 0 -
669Rule Para 1992 only - Oct 5 0:00 1:00 S
670Rule Para 1993 only - Mar 31 0:00 0 -
671Rule Para 1993 1995 - Oct 1 0:00 1:00 S
672Rule Para 1994 1995 - Feb lastSun 0:00 0 -
673Rule Para 1996 only - Mar 1 0:00 0 -
674# IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
675# From Steffen Thorsen (2000-10-02):
676# I have three independent reports that Paraguay changed to DST this Sunday
677# (10-01).
678#
679# Translated by Gwillim Law (2001-02-27) from
680# <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm">
681# Noticias, a daily paper in Asuncion, Paraguay (2000-10-01)
682# </a>:
683# Starting at 0:00 today, the clock will be set forward 60 minutes, in
684# fulfillment of Decree No. 7,273 of the Executive Power.... The time change
685# system has been operating for several years. Formerly there was a separate
686# decree each year; the new law has the same effect, but permanently. Every
687# year, the time will change on the first Sunday of October; likewise, the
688# clock will be set back on the first Sunday of March.
689#
690# From Jesper Norgaard (2001-03-06) [an official URL saying similar things]:
691# http://gateway.abc.com.py:8000/pub/pag04.mbr/artic?FHA=2001-03-03-02.24.52.900592
692#
693Rule Para 1996 max - Oct Sun>=1 0:00 1:00 S
694# IATA SSIM (1997-09) says Mar 1; go with Shanks.
695Rule Para 1997 only - Feb lastSun 0:00 0 -
696# Shanks says 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
697# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
698Rule Para 1998 max - Mar Sun>=1 0:00 0 -
699
700# Zone NAME GMTOFF RULES FORMAT [UNTIL]
701Zone America/Asuncion -3:50:40 - LMT 1890
702 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
703 -4:00 - PYT 1972 Oct # Paraguay Time
704 -3:00 - PYT 1974 Apr
705 -4:00 Para PY%sT
706
707# Peru
708# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
709Rule Peru 1938 only - Jan 1 0:00 1:00 S
710Rule Peru 1938 only - Apr 1 0:00 0 -
711Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
712Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
713Rule Peru 1987 only - Jan 1 0:00 1:00 S
714Rule Peru 1987 only - Apr 1 0:00 0 -
715Rule Peru 1990 only - Jan 1 0:00 1:00 S
716Rule Peru 1990 only - Apr 1 0:00 0 -
717# IATA is ambiguous for 1993/1995; go with Shanks.
718Rule Peru 1994 only - Jan 1 0:00 1:00 S
719Rule Peru 1994 only - Apr 1 0:00 0 -
720# Zone NAME GMTOFF RULES FORMAT [UNTIL]
721Zone America/Lima -5:08:12 - LMT 1890
722 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
723 -5:00 Peru PE%sT # Peru Time
724
725# South Georgia
726# Zone NAME GMTOFF RULES FORMAT [UNTIL]
727Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
728 -2:00 - GST # South Georgia Time
729
730# South Sandwich Is
731# uninhabited; scientific personnel have wintered
732
733# Suriname
734# Zone NAME GMTOFF RULES FORMAT [UNTIL]
735Zone America/Paramaribo -3:40:40 - LMT 1911
736 -3:40:52 - PMT 1935 # Paramaribo Mean Time
737 -3:40:36 - PMT 1945 Oct # The capital moved?
738 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
739 -3:30 - SRT 1984 Oct # Suriname Time
740 -3:00 - SRT
741
742# Trinidad and Tobago
743# Zone NAME GMTOFF RULES FORMAT [UNTIL]
744Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
745 -4:00 - AST
746
747# Uruguay
748# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
749# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
750# From Shanks:
751# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
752# Whitman gives 1923 Oct 1; go with Shanks.
753Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
754Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
755Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
756Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
757# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
758Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
759Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
760Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
761# Whitman gives 1937 Oct 3; go with Shanks.
762Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
763# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
764# and 1943 Apr 13 ``to present time''; go with Shanks.
765Rule Uruguay 1941 only - Aug 1 0:00 0 -
766Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
767Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
768Rule Uruguay 1943 only - Mar 14 0:00 0 -
769Rule Uruguay 1959 only - May 24 0:00 1:00 S
770Rule Uruguay 1959 only - Nov 15 0:00 0 -
771Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
772Rule Uruguay 1960 only - Mar 6 0:00 0 -
773Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
774Rule Uruguay 1965 only - Sep 26 0:00 0 -
775Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
776Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
777Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
778Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
779Rule Uruguay 1972 only - Aug 15 0:00 0 -
780Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
781Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
782Rule Uruguay 1976 only - Oct 1 0:00 0 -
783Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
784Rule Uruguay 1978 only - Apr 1 0:00 0 -
785Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
786Rule Uruguay 1980 only - May 1 0:00 0 -
787Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
788Rule Uruguay 1988 only - Mar 14 0:00 0 -
789Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
790Rule Uruguay 1989 only - Mar 12 0:00 0 -
791Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
792# Shanks says no DST was observed in 1990/1 and 1991/2,
793# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
794Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
795Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
796Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
797Rule Uruguay 1993 only - Feb 28 0:00 0 -
798# Zone NAME GMTOFF RULES FORMAT [UNTIL]
799Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
800 -3:44:44 - MMT 1920 May 1 # Montevideo MT
801 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
802 -3:00 Uruguay UY%sT
803
804# Venezuela
805# Zone NAME GMTOFF RULES FORMAT [UNTIL]
806Zone America/Caracas -4:27:44 - LMT 1890
807 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
808 -4:30 - VET 1965 # Venezuela Time
809 -4:00 - VET
2
3# $FreeBSD: head/share/zoneinfo/southamerica 75267 2001-04-06 16:46:52Z wollman $
4
5# This data is by no means authoritative; if you think you know better,
6# go ahead and edit the file (and please send any changes to
7# tz@elsie.nci.nih.gov for general use in the future).
8
9# From Paul Eggert <eggert@twinsun.com> (1999-07-07):
10# A good source for time zone historical data outside the U.S. is
11# Thomas G. Shanks, The International Atlas (5th edition),
12# San Diego: ACS Publications, Inc. (1999).
13#
14# Gwillim Law <Gwil_Law@bridge-point.com> writes that a good source
15# for recent time zone data is the International Air Transport
16# Association's Standard Schedules Information Manual (IATA SSIM),
17# published semiannually. Law sent in several helpful summaries
18# of the IATA's data after 1990.
19#
20# Except where otherwise noted, Shanks is the source for entries through 1990,
21# and IATA SSIM is the source for entries after 1990.
22#
23# Earlier editions of these tables used the North American style (e.g. ARST and
24# ARDT for Argentine Standard and Daylight Time), but the following quote
25# suggests that it's better to use European style (e.g. ART and ARST).
26# I suggest the use of _Summer time_ instead of the more cumbersome
27# _daylight-saving time_. _Summer time_ seems to be in general use
28# in Europe and South America.
29# -- E O Cutler, _New York Times_ (1937-02-14), quoted in
30# H L Mencken, _The American Language: Supplement I_ (1960), p 466
31#
32# Earlier editions of these tables also used the North American style
33# for time zones in Brazil, but this was incorrect, as Brazilians say
34# "summer time". Reinaldo Goulart, a Sao Paulo businessman active in
35# the railroad sector, writes (1999-07-06):
36# The subject of time zones is currently a matter of discussion/debate in
37# Brazil. Let's say that "the Brasilia time" is considered the
38# "official time" because Brasilia is the capital city.
39# The other three time zones are called "Brasilia time "minus one" or
40# "plus one" or "plus two". As far as I know there is no such
41# name/designation as "Eastern Time" or "Central Time".
42# So I invented the following (English-language) abbreviations for now.
43# Corrections are welcome!
44# std dst
45# -2:00 FNT FNST Fernando de Noronha
46# -3:00 BRT BRST Brasilia
47# -4:00 AMT AMST Amazon
48# -5:00 ACT ACST Acre
49
50###############################################################################
51
52###############################################################################
53
54# Argentina
55
56# From Bob Devine (1988-01-28):
57# Argentina: first Sunday in October to first Sunday in April since 1976.
58# Double Summer time from 1969 to 1974. Switches at midnight.
59
60# From U. S. Naval Observatory (1988-01-199):
61# ARGENTINA 3 H BEHIND UTC
62
63# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
64# I am sending modifications to the Argentine time zone table...
65# AR was chosen because they are the ISO letters that represent Argentina.
66
67# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
68Rule Arg 1930 only - Dec 1 0:00 1:00 S
69Rule Arg 1931 only - Apr 1 0:00 0 -
70Rule Arg 1931 only - Oct 15 0:00 1:00 S
71Rule Arg 1932 1940 - Mar 1 0:00 0 -
72Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
73Rule Arg 1940 only - Jul 1 0:00 1:00 S
74Rule Arg 1941 only - Jun 15 0:00 0 -
75Rule Arg 1941 only - Oct 15 0:00 1:00 S
76Rule Arg 1943 only - Aug 1 0:00 0 -
77Rule Arg 1943 only - Oct 15 0:00 1:00 S
78Rule Arg 1946 only - Mar 1 0:00 0 -
79Rule Arg 1946 only - Oct 1 0:00 1:00 S
80Rule Arg 1963 only - Oct 1 0:00 0 -
81Rule Arg 1963 only - Dec 15 0:00 1:00 S
82Rule Arg 1964 1966 - Mar 1 0:00 0 -
83Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
84Rule Arg 1967 only - Apr 1 0:00 0 -
85Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
86Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
87Rule Arg 1974 only - Jan 23 0:00 1:00 S
88Rule Arg 1974 only - May 1 0:00 0 -
89Rule Arg 1974 1976 - Oct Sun>=1 0:00 1:00 S
90Rule Arg 1975 1977 - Apr Sun>=1 0:00 0 -
91Rule Arg 1985 only - Nov 2 0:00 1:00 S
92Rule Arg 1986 only - Mar 14 0:00 0 -
93Rule Arg 1986 1987 - Oct 25 0:00 1:00 S
94Rule Arg 1987 only - Feb 13 0:00 0 -
95Rule Arg 1988 only - Feb 7 0:00 0 -
96Rule Arg 1988 only - Dec 1 0:00 1:00 S
97#
98# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
99# These corrections were contributed by InterSoft Argentina S.A.,
100# obtaining the data from the:
101# Talleres de Hidrografia Naval Argentina
102# (Argentine Naval Hydrography Institute)
103#
104# Shanks stops after 1992-03-01; go with Otero.
105Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
106Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
107#
108# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
109# From this moment on, the law that mandated the daylight saving
110# time corrections was derogated and no more modifications
111# to the time zones (for daylight saving) are now made.
112#
113# From Rives McDow (2000-01-10):
114# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
115# which did not result in the switch of a time zone, as they stayed 9 hours
116# from the International Date Line.
117Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
118Rule Arg 2000 only - Mar Sun>=1 0:00 0 -
119#
120# From Peter Gradelski via Steffen Thorsen (2000-03-01):
121# We just checked with our Sao Paulo office and they say the government of
122# Argentina decided not to become one of the countries that go on or off DST.
123# So Buenos Aires should be -3 hours from GMT at all times.
124#
125# From Fabian L. Arce Jofre <farcejofre@bigfoot.com> (2000-04-04):
126# The law that claimed DST for Argentina was derogated by President Fernando
127# de la Rua on March 2, 2000, because it would make people spend more energy
128# in the winter time, rather than less. The change took effect on March 3.
129#
130# Zone NAME GMTOFF RULES FORMAT [UNTIL]
131#
132# Buenos Aires (BA), Capital Federal (CF), Santa Cruz (SC),
133# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
134Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
135 -4:16:44 - CMT 1920 May # Cordoba Mean Time
136 -4:00 - ART 1930 Dec
137 -4:00 Arg AR%sT 1969 Oct 5
138 -3:00 Arg AR%sT 1999 Oct 3 0:00
139 -4:00 Arg AR%sT 2000 Mar 3 0:00
140 -3:00 - ART
141#
142# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
143# Formosa (FM), La Pampa (LP), Chubut (CH)
144Zone America/Rosario -4:02:40 - LMT 1894 Nov
145 -4:16:44 - CMT 1920 May
146 -4:00 - ART 1930 Dec
147 -4:00 Arg AR%sT 1969 Oct 5
148 -3:00 Arg AR%sT 1991 Jul
149 -3:00 - ART 1999 Oct 3 0:00
150 -4:00 Arg AR%sT 2000 Mar 3 0:00
151 -3:00 - ART
152#
153# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL),
154# Neuquen (NQ), Rio Negro (RN)
155Zone America/Cordoba -4:16:44 - LMT 1894 Nov
156 -4:16:44 - CMT 1920 May
157 -4:00 - ART 1930 Dec
158 -4:00 Arg AR%sT 1969 Oct 5
159 -3:00 Arg AR%sT 1990 Jul
160 -3:00 - ART 1999 Oct 3 0:00
161 -4:00 Arg AR%sT 2000 Mar 3 0:00
162 -3:00 - ART
163#
164# Jujuy (JY)
165Zone America/Jujuy -4:21:12 - LMT 1894 Nov
166 -4:16:44 - CMT 1920 May
167 -4:00 - ART 1930 Dec
168 -4:00 Arg AR%sT 1969 Oct 5
169 -3:00 Arg AR%sT 1991 Mar 3
170 -4:00 - WART 1991 Oct 6
171 -4:00 1:00 WARST 1992 Mar 15
172 -4:00 - WART 1992 Oct 18
173 -3:00 - ART 1999 Oct 3 0:00
174 -4:00 Arg AR%sT 2000 Mar 3 0:00
175 -3:00 - ART
176#
177# Catamarca (CT)
178Zone America/Catamarca -4:23:08 - LMT 1894 Nov
179 -4:16:44 - CMT 1920 May
180 -4:00 - ART 1930 Dec
181 -4:00 Arg AR%sT 1969 Oct 5
182 -3:00 Arg AR%sT 1990 Jul
183 -3:00 - ART 1991 Jul
184 -3:00 Arg AR%sT 1992 Jul
185 -3:00 - ART 1999 Oct 3 0:00
186 -4:00 Arg AR%sT 2000 Mar 3 0:00
187 -3:00 - ART
188#
189# Mendoza (MZ)
190Zone America/Mendoza -4:35:16 - LMT 1894 Nov
191 -4:16:44 - CMT 1920 May
192 -4:00 - ART 1930 Dec
193 -4:00 Arg AR%sT 1969 Oct 5
194 -3:00 Arg AR%sT 1991 Mar 3
195 -4:00 - WART 1991 Oct 15
196 -4:00 1:00 WARST 1992 Mar 1
197 -4:00 - WART 1992 Oct 18
198 -3:00 - ART 1999 Oct 3 0:00
199 -4:00 Arg AR%sT 2000 Mar 3 0:00
200 -3:00 - ART
201
202# Aruba
203# Zone NAME GMTOFF RULES FORMAT [UNTIL]
204Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
205 -4:30 - ANT 1965 # Netherlands Antilles Time
206 -4:00 - AST
207
208# Bolivia
209# Zone NAME GMTOFF RULES FORMAT [UNTIL]
210Zone America/La_Paz -4:32:36 - LMT 1890
211 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time
212 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
213 -4:00 - BOT # Bolivia Time
214
215# Brazil
216
217# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
218# The mayor of Rio recently attempted to change the time zone rules
219# just in his city, in order to leave more summer time for the tourist trade.
220# The rule change lasted only part of the day;
221# the federal government refused to follow the city's rules, and business
222# was in a chaos, so the mayor backed down that afternoon.
223
224# From IATA SSIM (1996-02):
225# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
226# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
227# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
228# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
229# [The last three states are new to this issue of the IATA SSIM.]
230
231# From Gwillim Law (1996-10-07):
232# Geography, history (Tocantins was part of Goias until 1989), and other
233# sources of time zone information lead me to believe that AL, SE, and TO were
234# always in BR1, and so the only change was whether or not they observed DST....
235# The earliest issue of the SSIM I have is 2/91. Each issue from then until
236# 9/95 says that DST is observed only in the ten states I quoted from 9/95,
237# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
238# (UTC-4).... The other two time zones given for Brazil are BR3, which is
239# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
240# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
241# become part of the state of Pernambuco). The boundary between BR1 and BR2
242# has never been clearly stated. They've simply been called East and West.
243# However, some conclusions can be drawn from another IATA manual: the Airline
244# Coding Directory, which lists close to 400 airports in Brazil. For each
245# airport it gives a time zone which is coded to the SSIM. From that
246# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
247# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
248# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
249
250# From Marcos Tadeu (1998-09-27):
251# <a href="http://pcdsh01.on.br/verao1.html">
252# Brazilian official page
253# </a>
254
255# From Jesper Norgaard (2000-11-03):
256# [For an official list of which regions in Brazil use which time zones, see:]
257# http://pcdsh01.on.br/Fusbr.htm
258# http://pcdsh01.on.br/Fusbrhv.htm
259
260# From Paul Eggert (2000-10-02):
261# The official decrees referenced below are taken from
262# <a href="http://pcdsh01.on.br/DecHV.html">
263# Decretos sobre o Horario de Verao no Brasil
264# </a> (1999-10-04, in Portuguese).
265# The official site for all decrees, including those not related to time, is
266# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/principal_ano.htm">
267# Presidencia da Republica, Subchefia para Assuntos Juridicos, Decretos
268# </a> (in Portuguese).
269
270# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
271# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
272# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
273Rule Brazil 1931 only - Oct 3 11:00 1:00 S
274Rule Brazil 1932 1933 - Apr 1 0:00 0 -
275Rule Brazil 1932 only - Oct 3 0:00 1:00 S
276# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
277# revoked DST.
278# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
279# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
280Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
281Rule Brazil 1950 only - Apr 16 1:00 0 -
282Rule Brazil 1951 1952 - Apr 1 0:00 0 -
283# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
284Rule Brazil 1953 only - Mar 1 0:00 0 -
285# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
286# revoked DST.
287# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
288# established DST from 1963-10-23 00:00 to 1964-02-29 00:00
289# in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
290# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
291# extended the above decree to all of the national territory on 12-09.
292Rule Brazil 1963 only - Dec 9 0:00 1:00 S
293# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
294# extended summer time by one day to 1964-03-01 00:00 (start of school).
295Rule Brazil 1964 only - Mar 1 0:00 0 -
296# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
297Rule Brazil 1965 only - Jan 31 0:00 1:00 S
298Rule Brazil 1965 only - Mar 31 0:00 0 -
299# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
300Rule Brazil 1965 only - Dec 1 0:00 1:00 S
301# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
302Rule Brazil 1966 1968 - Mar 1 0:00 0 -
303Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
304# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
305# revoked DST.
306# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
307Rule Brazil 1985 only - Nov 2 0:00 1:00 S
308# Decree 92,310 (1986-01-21)
309# Decree 92,463 (1986-03-13)
310Rule Brazil 1986 only - Mar 15 0:00 0 -
311# Decree 93,316 (1986-10-01)
312Rule Brazil 1986 only - Oct 25 0:00 1:00 S
313Rule Brazil 1987 only - Feb 14 0:00 0 -
314# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
315Rule Brazil 1987 only - Oct 25 0:00 1:00 S
316Rule Brazil 1988 only - Feb 7 0:00 0 -
317# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
318# except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
319Rule Brazil 1988 only - Oct 16 0:00 1:00 S
320Rule Brazil 1989 only - Jan 29 0:00 0 -
321# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
322# with the same exceptions
323Rule Brazil 1989 only - Oct 15 0:00 1:00 S
324Rule Brazil 1990 only - Feb 11 0:00 0 -
325# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
326# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
327# Decree 99,629 (1990-10-19) adds BA, MT.
328Rule Brazil 1990 only - Oct 21 0:00 1:00 S
329Rule Brazil 1991 only - Feb 17 0:00 0 -
330# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
331# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
332Rule Brazil 1991 only - Oct 20 0:00 1:00 S
333Rule Brazil 1992 only - Feb 9 0:00 0 -
334# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
335# adopted by same states.
336Rule Brazil 1992 only - Oct 25 0:00 1:00 S
337Rule Brazil 1993 only - Jan 31 0:00 0 -
338# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
339# adopted by same states, plus AM.
340# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22)
341# adopted by same states, minus AM.
342# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
343# adopted by same states, plus TO.
344# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
345# adds AL, SE.
346Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
347Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
348Rule Brazil 1996 only - Feb 11 0:00 0 -
349# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
350# adopted by same states, minus AL, SE.
351Rule Brazil 1996 only - Oct 6 0:00 1:00 S
352Rule Brazil 1997 only - Feb 16 0:00 0 -
353# From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12):
354# In 1997, the DS began on October 6. The stated reason was that
355# because international television networks ignored Brazil's policy on DS,
356# they bought the wrong times on satellite for coverage of Pope's visit.
357# This year, the ending date of DS was postponed to March 1
358# to help dealing with the shortages of electric power.
359#
360# From Paul Eggert (1998-02-25):
361# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm">
362# Brazil Prepares for Papal Visit
363# </a>,
364# Church Net UK (1997-10-02).
365#
366# Decree 2,317 (1997-09-04), adopted by same states.
367Rule Brazil 1997 only - Oct 6 0:00 1:00 S
368# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
369# (1998-02-10)
370Rule Brazil 1998 only - Mar 1 0:00 0 -
371# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
372# adopted by the same states as before.
373Rule Brazil 1998 only - Oct 11 0:00 1:00 S
374Rule Brazil 1999 only - Feb 21 0:00 0 -
375# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
376# (1999-08-23) adopted by same states.
377# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
378# adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
379Rule Brazil 1999 only - Oct 3 0:00 1:00 S
380Rule Brazil 2000 only - Feb 27 0:00 0 -
381# Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06)
382# adopted by the same states as before.
383# Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13)
384# repeals DST in PE and RR, effective 2000-10-15 00:00.
385# Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17)
386# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
387#
388# These give only one year's rules. After that, the rules are guesses
389# and are quite possibly wrong, but are more likely than no DST at all.
390Rule Brazil 2000 max - Oct Sun>=8 0:00 1:00 S
391Rule Brazil 2001 max - Feb Sun>=15 0:00 0 -
392
393
394# Zone NAME GMTOFF RULES FORMAT [UNTIL]
395#
396# Atlantic islands: Fernando de Noronha, Trindade, Martin Vaz,
397# Atol das Rocas, and Penedos de Sao Pedro e Sao Paulo
398Zone America/Noronha -2:09:40 - LMT 1914
399 -2:00 Brazil FN%sT 1990 Sep 17
400 -2:00 - FNT
401#
402# Amapa (AP), east Para (PA)
403# East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu.
404Zone America/Belem -3:13:56 - LMT 1914
405 -3:00 Brazil BR%sT 1988 Sep 12
406 -3:00 - BRT
407#
408# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
409# Paraiba (PB)
410Zone America/Fortaleza -2:34:00 - LMT 1914
411 -3:00 Brazil BR%sT 1990 Sep 17
412 -3:00 - BRT 1999 Sep 30
413 -3:00 Brazil BR%sT 2000 Oct 22
414 -3:00 - BRT
415#
416# Pernambuco (PE) (except Atlantic islands)
417Zone America/Recife -2:19:36 - LMT 1914
418 -3:00 Brazil BR%sT 1990 Sep 17
419 -3:00 - BRT 1999 Sep 30
420 -3:00 Brazil BR%sT 2000 Oct 15
421 -3:00 - BRT
422#
423# Tocantins (TO)
424Zone America/Araguaina -3:12:48 - LMT 1914
425 -3:00 Brazil BR%sT 1990 Sep 17
426 -3:00 - BRT 1995 Sep 14
427 -3:00 Brazil BR%sT
428#
429# Alagoas (AL), Sergipe (SE)
430Zone America/Maceio -2:22:52 - LMT 1914
431 -3:00 Brazil BR%sT 1990 Sep 17
432 -3:00 - BRT 1995 Oct 13
433 -3:00 Brazil BR%sT 1996 Sep 4
434 -3:00 - BRT 1999 Sep 30
435 -3:00 Brazil BR%sT 2000 Oct 22
436 -3:00 - BRT
437#
438# Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
439# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
440# Santa Catarina (SC), Rio Grande do Sul (RS)
441Zone America/Sao_Paulo -3:06:28 - LMT 1914
442 -3:00 Brazil BR%sT 1963 Oct 23 00:00
443 -3:00 1:00 BRST 1964
444 -3:00 Brazil BR%sT
445#
446# Mato Grosso, Mato Grosso do Sul
447Zone America/Cuiaba -3:44:20 - LMT 1914
448 -4:00 Brazil AM%sT
449#
450# west Para (PA), Rondonia (RO)
451# West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem.
452Zone America/Porto_Velho -4:15:36 - LMT 1914
453 -4:00 Brazil AM%sT 1988 Sep 12
454 -4:00 - AMT
455#
456# Roraima (RR)
457Zone America/Boa_Vista -4:02:40 - LMT 1914
458 -4:00 Brazil AM%sT 1988 Sep 12
459 -4:00 - AMT 1999 Sep 30
460 -4:00 Brazil AM%sT 2000 Oct 15
461 -4:00 - AMT
462#
463# east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto
464Zone America/Manaus -4:00:04 - LMT 1914
465 -4:00 Brazil AM%sT 1988 Sep 12
466 -4:00 - AMT 1993 Sep 28
467 -4:00 Brazil AM%sT 1994 Sep 22
468 -4:00 - AMT
469#
470# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
471# Eirunepe, Envira, Ipixuna
472Zone America/Eirunepe -4:39:28 - LMT 1914
473 -5:00 Brazil AC%sT 1988 Sep 12
474 -5:00 - ACT 1993 Sep 28
475 -5:00 Brazil AC%sT 1994 Sep 22
476 -5:00 - ACT
477#
478# Acre (AC)
479Zone America/Rio_Branco -4:31:12 - LMT 1914
480 -5:00 Brazil AC%sT 1988 Sep 12
481 -5:00 - ACT
482
483
484# Chile
485
486# From Eduardo Krell (1995-10-19):
487# The law says to switch to DST at midnight [24:00] on the second SATURDAY
488# of October.... The law is the same for March and October.
489# (1998-09-29):
490# Because of the drought this year, the government decided to go into
491# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
492# (unless there's another dry season next year, I guess).
493
494# From Julio I. Pacheco Troncoso (1999-03-18):
495# Because of the same drought, the government decided to end DST later,
496# on April 3, (one-time change).
497
498# From Gwillim Law (2001-02-20):
499# I came across a Chilean on-line newspaper, La Tercera. Its
500# <a href="http://www.tercera.cl/diario/1998/03/13/extras.html">
501# 1998-03-13 issue
502# </a>, says (my translation):
503# "At 24:00 (midnight) tomorrow (Saturday) - 22:00 in the insular
504# territory [Easter Island, Juan Fernandez, etc.] - winter time will
505# begin in the entire country."
506
507# From Paul Eggert (2001-02-21):
508# Assume this rule has been used since DST was introduced in the islands.
509
510# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
511Rule Chile 1918 only - Sep 1 0:00 1:00 S
512Rule Chile 1919 only - Jul 2 0:00 0 -
513Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
514Rule Chile 1928 1932 - Apr 1 0:00 0 -
515Rule Chile 1969 1997 - Oct Sun>=9 4:00u 1:00 S
516Rule Chile 1970 1998 - Mar Sun>=9 3:00u 0 -
517Rule Chile 1998 only - Sep 27 4:00u 1:00 S
518Rule Chile 1999 only - Apr 4 3:00u 0 -
519Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S
520Rule Chile 2000 max - Mar Sun>=9 3:00u 0 -
521# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
522# (1996-09) says 1998-03-08. Ignore these.
523# Zone NAME GMTOFF RULES FORMAT [UNTIL]
524Zone America/Santiago -4:42:40 - LMT 1890
525 -4:42:40 - SMT 1910 # Santiago Mean Time
526 -5:00 Chile CL%sT 1932 Sep # Chile Time
527 -4:00 Chile CL%sT
528Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
529 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
530 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
531 -6:00 Chile EAS%sT
532#
533# Whitman says Juan Fernandez Is are like America/Santiago.
534# San Ambrosio, San Felix
535# no information; probably like America/Santiago
536
537
538# Colombia
539# Shanks specifies 24:00 for 1992 transition times; go with IATA,
540# as it seems implausible to change clocks at midnight New Year's Eve.
541# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
542Rule CO 1992 only - May 2 0:00 1:00 S
543Rule CO 1992 only - Dec 31 0:00 0 -
544# Zone NAME GMTOFF RULES FORMAT [UNTIL]
545Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
546 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
547 -5:00 CO CO%sT # Colombia Time
548# Malpelo, Providencia, San Andres
549# no information; probably like America/Bogota
550
551# Curacao
552# Shanks says that Bottom and Oranjestad have been at -4:00 since
553# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
554# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
555# This all predates our 1970 cutoff, though.
556# Zone NAME GMTOFF RULES FORMAT [UNTIL]
557Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
558 -4:30 - ANT 1965 # Netherlands Antilles Time
559 -4:00 - AST
560
561# Ecuador
562# Zone NAME GMTOFF RULES FORMAT [UNTIL]
563Zone America/Guayaquil -5:19:20 - LMT 1890
564 -5:14:00 - QMT 1931 # Quito Mean Time
565 -5:00 - ECT # Ecuador Time
566Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
567 -5:00 - ECT 1986
568 -6:00 - GALT # Galapagos Time
569
570# Falklands
571
572# From Paul Eggert (2001-03-05):
573# Between 1990 and 2000 inclusive, Shanks and the IATA agree except
574# the IATA gives 1996-09-08. Go with Shanks.
575
576# From Falkland Islands Government Office, London (2001-01-22)
577# via Jesper Norgaard:
578# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
579# April 2001 and advance one hour to summer time at 2 am on Sunday 2
580# September. It is anticipated that the clocks will revert back at 2
581# am on Sunday 21 April 2002 and advance to summer time at 2 am on
582# Sunday 1 September.
583
584# From Rives McDow (2001-02-13):
585#
586# I have communicated several times with people there, and the last
587# time I had communications that was helpful was in 1998. Here is
588# what was said then:
589#
590# "The general rule was that Stanley used daylight saving and the Camp
591# did not. However for various reasons many people in the Camp have
592# started to use daylight saving (known locally as 'Stanley Time')
593# There is no rule as to who uses daylight saving - it is a matter of
594# personal choice and so it is impossible to draw a map showing who
595# uses it and who does not. Any list would be out of date as soon as
596# it was produced. This year daylight saving ended on April 18/19th
597# and started again on September 12/13th. I do not know what the rule
598# is, but can find out if you like. We do not change at the same time
599# as UK or Chile."
600#
601# I did have in my notes that the rule was "Second Saturday in Sep at
602# 0:00 until third Saturday in Apr at 0:00". I think that this does
603# not agree in some cases with Shanks; is this true?
604#
605# Also, there is no mention in the list that some areas in the
606# Falklands do not use DST. I have found in my communications there
607# that these areas are on the western half of East Falkland and all of
608# West Falkland. Stanley is the only place that consistently observes
609# DST. Again, as in other places in the world, the farmers don't like
610# it. West Falkland is almost entirely sheep farmers.
611#
612# I know one lady there that keeps a list of which farm keeps DST and
613# which doesn't each year. She runs a shop in Stanley, and says that
614# the list changes each year. She uses it to communicate to her
615# customers, catching them when they are home for lunch or dinner.
616
617# From Paul Eggert (2001-03-05):
618# For now, we'll just record the time in Stanley, since we have no
619# better info.
620
621# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
622Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
623Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
624Rule Falk 1939 only - Oct 1 0:00 1:00 S
625Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
626Rule Falk 1943 only - Jan 1 0:00 0 -
627Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
628Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
629Rule Falk 1984 only - Sep 16 0:00 1:00 S
630Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
631Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
632Rule Falk 2001 max - Apr Sun>=15 2:00 0 -
633Rule Falk 2001 max - Sep Sun>=1 2:00 1:00 S
634# Zone NAME GMTOFF RULES FORMAT [UNTIL]
635Zone Atlantic/Stanley -3:51:24 - LMT 1890
636 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
637 -4:00 Falk FK%sT 1983 May # Falkland Is Time
638 -3:00 Falk FK%sT 1985 Sep 15
639 -4:00 Falk FK%sT
640
641# French Guiana
642# Zone NAME GMTOFF RULES FORMAT [UNTIL]
643Zone America/Cayenne -3:29:20 - LMT 1911 Jul
644 -4:00 - GFT 1967 Oct # French Guiana Time
645 -3:00 - GFT
646
647# Guyana
648# Zone NAME GMTOFF RULES FORMAT [UNTIL]
649Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
650 -3:45 - GBGT 1966 May 26 # Br Guiana Time
651 -3:45 - GYT 1975 Jul 31 # Guyana Time
652 -3:00 - GYT 1991
653# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
654 -4:00 - GYT
655
656# Paraguay
657# From Paul Eggert (1999-10-29):
658# Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
659# and autumn transitions are from 00:00 -> 23:00. Go with earlier
660# editions of Shanks, and with the IATA, who say transitions occur at 00:00.
661# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
662Rule Para 1975 1988 - Oct 1 0:00 1:00 S
663Rule Para 1975 1978 - Mar 1 0:00 0 -
664Rule Para 1979 1991 - Apr 1 0:00 0 -
665Rule Para 1989 only - Oct 22 0:00 1:00 S
666Rule Para 1990 only - Oct 1 0:00 1:00 S
667Rule Para 1991 only - Oct 6 0:00 1:00 S
668Rule Para 1992 only - Mar 1 0:00 0 -
669Rule Para 1992 only - Oct 5 0:00 1:00 S
670Rule Para 1993 only - Mar 31 0:00 0 -
671Rule Para 1993 1995 - Oct 1 0:00 1:00 S
672Rule Para 1994 1995 - Feb lastSun 0:00 0 -
673Rule Para 1996 only - Mar 1 0:00 0 -
674# IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
675# From Steffen Thorsen (2000-10-02):
676# I have three independent reports that Paraguay changed to DST this Sunday
677# (10-01).
678#
679# Translated by Gwillim Law (2001-02-27) from
680# <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm">
681# Noticias, a daily paper in Asuncion, Paraguay (2000-10-01)
682# </a>:
683# Starting at 0:00 today, the clock will be set forward 60 minutes, in
684# fulfillment of Decree No. 7,273 of the Executive Power.... The time change
685# system has been operating for several years. Formerly there was a separate
686# decree each year; the new law has the same effect, but permanently. Every
687# year, the time will change on the first Sunday of October; likewise, the
688# clock will be set back on the first Sunday of March.
689#
690# From Jesper Norgaard (2001-03-06) [an official URL saying similar things]:
691# http://gateway.abc.com.py:8000/pub/pag04.mbr/artic?FHA=2001-03-03-02.24.52.900592
692#
693Rule Para 1996 max - Oct Sun>=1 0:00 1:00 S
694# IATA SSIM (1997-09) says Mar 1; go with Shanks.
695Rule Para 1997 only - Feb lastSun 0:00 0 -
696# Shanks says 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
697# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
698Rule Para 1998 max - Mar Sun>=1 0:00 0 -
699
700# Zone NAME GMTOFF RULES FORMAT [UNTIL]
701Zone America/Asuncion -3:50:40 - LMT 1890
702 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
703 -4:00 - PYT 1972 Oct # Paraguay Time
704 -3:00 - PYT 1974 Apr
705 -4:00 Para PY%sT
706
707# Peru
708# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
709Rule Peru 1938 only - Jan 1 0:00 1:00 S
710Rule Peru 1938 only - Apr 1 0:00 0 -
711Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
712Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
713Rule Peru 1987 only - Jan 1 0:00 1:00 S
714Rule Peru 1987 only - Apr 1 0:00 0 -
715Rule Peru 1990 only - Jan 1 0:00 1:00 S
716Rule Peru 1990 only - Apr 1 0:00 0 -
717# IATA is ambiguous for 1993/1995; go with Shanks.
718Rule Peru 1994 only - Jan 1 0:00 1:00 S
719Rule Peru 1994 only - Apr 1 0:00 0 -
720# Zone NAME GMTOFF RULES FORMAT [UNTIL]
721Zone America/Lima -5:08:12 - LMT 1890
722 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
723 -5:00 Peru PE%sT # Peru Time
724
725# South Georgia
726# Zone NAME GMTOFF RULES FORMAT [UNTIL]
727Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
728 -2:00 - GST # South Georgia Time
729
730# South Sandwich Is
731# uninhabited; scientific personnel have wintered
732
733# Suriname
734# Zone NAME GMTOFF RULES FORMAT [UNTIL]
735Zone America/Paramaribo -3:40:40 - LMT 1911
736 -3:40:52 - PMT 1935 # Paramaribo Mean Time
737 -3:40:36 - PMT 1945 Oct # The capital moved?
738 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
739 -3:30 - SRT 1984 Oct # Suriname Time
740 -3:00 - SRT
741
742# Trinidad and Tobago
743# Zone NAME GMTOFF RULES FORMAT [UNTIL]
744Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
745 -4:00 - AST
746
747# Uruguay
748# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
749# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
750# From Shanks:
751# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
752# Whitman gives 1923 Oct 1; go with Shanks.
753Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
754Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
755Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
756Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
757# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
758Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
759Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
760Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
761# Whitman gives 1937 Oct 3; go with Shanks.
762Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
763# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
764# and 1943 Apr 13 ``to present time''; go with Shanks.
765Rule Uruguay 1941 only - Aug 1 0:00 0 -
766Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
767Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
768Rule Uruguay 1943 only - Mar 14 0:00 0 -
769Rule Uruguay 1959 only - May 24 0:00 1:00 S
770Rule Uruguay 1959 only - Nov 15 0:00 0 -
771Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
772Rule Uruguay 1960 only - Mar 6 0:00 0 -
773Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
774Rule Uruguay 1965 only - Sep 26 0:00 0 -
775Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
776Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
777Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
778Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
779Rule Uruguay 1972 only - Aug 15 0:00 0 -
780Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
781Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
782Rule Uruguay 1976 only - Oct 1 0:00 0 -
783Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
784Rule Uruguay 1978 only - Apr 1 0:00 0 -
785Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
786Rule Uruguay 1980 only - May 1 0:00 0 -
787Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
788Rule Uruguay 1988 only - Mar 14 0:00 0 -
789Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
790Rule Uruguay 1989 only - Mar 12 0:00 0 -
791Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
792# Shanks says no DST was observed in 1990/1 and 1991/2,
793# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
794Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
795Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
796Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
797Rule Uruguay 1993 only - Feb 28 0:00 0 -
798# Zone NAME GMTOFF RULES FORMAT [UNTIL]
799Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
800 -3:44:44 - MMT 1920 May 1 # Montevideo MT
801 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
802 -3:00 Uruguay UY%sT
803
804# Venezuela
805# Zone NAME GMTOFF RULES FORMAT [UNTIL]
806Zone America/Caracas -4:27:44 - LMT 1890
807 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
808 -4:30 - VET 1965 # Venezuela Time
809 -4:00 - VET