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1# @(#)southamerica 7.35
2# $FreeBSD: head/share/zoneinfo/southamerica 58787 2000-03-29 14:01:46Z ru $
1# @(#)southamerica 7.36
3
2
3# $FreeBSD: head/share/zoneinfo/southamerica 64499 2000-08-10 19:36:46Z wollman $
4
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 <eggert@twinsun.com> (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 <Gwil_Law@bridge-point.com> 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 <hernan@isoft.com.ar> (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 1 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 1974 1976 - Oct Sun>=1 0:00 1:00 S
89Rule Arg 1975 1977 - Apr Sun>=1 0:00 0 -
90Rule Arg 1985 only - Nov 2 0:00 1:00 S
91Rule Arg 1986 only - Mar 14 0:00 0 -
92Rule Arg 1986 1987 - Oct 25 0:00 1:00 S
93Rule Arg 1987 only - Feb 13 0:00 0 -
94Rule Arg 1988 only - Feb 7 0:00 0 -
95Rule Arg 1988 only - Dec 1 0:00 1:00 S
96#
97# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
98# These corrections were contributed by InterSoft Argentina S.A.,
99# obtaining the data from the:
100# Talleres de Hidrografia Naval Argentina
101# (Argentine Naval Hydrography Institute)
102#
103# Shanks stops after 1992-03-01; go with Otero.
104Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
105Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
106#
107# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
108# From this moment on, the law that mandated the daylight saving
109# time corrections was derogated and no more modifications
110# to the time zones (for daylight saving) are now made.
111#
112# From Rives McDow (2000-01-10):
113# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
114# which did not result in the switch of a time zone, as they stayed 9 hours
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
115# from the International Date Line. On March 5, 2000, at 0:00 local time,
116# Argentina will come off daylight savings time, which will bring them to 8
117# hours from the International Date Line.
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 -
118#
119# From Peter Gradelski via Steffen Thorsen (2000-03-01):
120# We just checked with our San Paulo office and they say the government of
121# Argentina decided not to become one of the countries that go on or off DST.
122# So Buenos Aires should be -3 hours from GMT at all times.
123#
119#
120# From Peter Gradelski via Steffen Thorsen (2000-03-01):
121# We just checked with our San 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#
124# Zone NAME GMTOFF RULES FORMAT [UNTIL]
125#
130# Zone NAME GMTOFF RULES FORMAT [UNTIL]
131#
126# Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC),
127# Tierra del Fuego (TF) & Antartida e Islas
132# Buenos Aires (BA), Capital Federal (CF), Santa Cruz (SC),
133# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
128Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
129 -4:16:44 - CMT 1920 May # Cordoba Mean Time
130 -4:00 - ART 1930 Dec
131 -4:00 Arg AR%sT 1969 Oct 5
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
132 -3:00 Arg AR%sT
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
133#
134# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
135# Formosa (FM), La Pampa (LP), Chubut (CH)
136Zone America/Rosario -4:02:40 - LMT 1894 Nov
137 -4:16:44 - CMT 1920 May
138 -4:00 - ART 1930 Dec
139 -4:00 Arg AR%sT 1969 Oct 5
140 -3:00 Arg AR%sT 1991 Jul
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
141 -3:00 - ART
142#
143# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL),
144# Neuquen (NQ), Rio Negro (RN)
145Zone America/Cordoba -4:16:44 - LMT 1894 Nov
146 -4:16:44 - CMT 1920 May
147 -4:00 - ART 1930 Dec
148 -4:00 Arg AR%sT 1969 Oct 5
149 -3:00 Arg AR%sT 1990 Jul
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
150 -3:00 - ART
151#
152# Jujuy (JY)
153Zone America/Jujuy -4:21:12 - LMT 1894 Nov
154 -4:16:44 - CMT 1920 May
155 -4:00 - ART 1930 Dec
156 -4:00 Arg AR%sT 1969 Oct 5
157 -3:00 Arg AR%sT 1991 Mar 3
158 -4:00 - WART 1991 Oct 6
159 -4:00 1:00 WARST 1992 Mar 15
160 -4:00 - WART 1992 Oct 18
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
161 -3:00 - ART
162#
163# Catamarca (CT)
164Zone America/Catamarca -4:23:08 - LMT 1894 Nov
165 -4:16:44 - CMT 1920 May
166 -4:00 - ART 1930 Dec
167 -4:00 Arg AR%sT 1969 Oct 5
168 -3:00 Arg AR%sT 1990 Jul
169 -3:00 - ART 1991 Jul
170 -3:00 Arg AR%sT 1992 Jul
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
171 -3:00 - ART
172#
173# Mendoza (MZ)
174Zone America/Mendoza -4:35:16 - LMT 1894 Nov
175 -4:16:44 - CMT 1920 May
176 -4:00 - ART 1930 Dec
177 -4:00 Arg AR%sT 1969 Oct 5
178 -3:00 Arg AR%sT 1991 Mar 3
179 -4:00 - WART 1991 Oct 15
180 -4:00 1:00 WARST 1992 Mar 1
181 -4:00 - WART 1992 Oct 18
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
182 -3:00 - ART
183
184# Aruba
185# Zone NAME GMTOFF RULES FORMAT [UNTIL]
186Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
187 -4:30 - ANT 1965 # Netherlands Antilles Time
188 -4:00 - AST
189
190# Bolivia
191# Zone NAME GMTOFF RULES FORMAT [UNTIL]
192Zone America/La_Paz -4:32:36 - LMT 1890
193 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time
194 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
195 -4:00 - BOT # Bolivia Time
196
197# Brazil
198
199# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
200# The mayor of Rio recently attempted to change the time zone rules
201# just in his city, in order to leave more summer time for the tourist trade.
202# The rule change lasted only part of the day;
203# the federal government refused to follow the city's rules, and business
204# was in a chaos, so the mayor backed down that afternoon.
205
206# From IATA SSIM (1996-02):
207# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
208# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
209# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
210# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
211# [The last three states are new to this issue of the IATA SSIM.]
212
213# From Gwillim Law (1996-10-07):
214# Geography, history (Tocantins was part of Goias until 1989), and other
215# sources of time zone information lead me to believe that AL, SE, and TO were
216# always in BR1, and so the only change was whether or not they observed DST....
217# The earliest issue of the SSIM I have is 2/91. Each issue from then until
218# 9/95 says that DST is observed only in the ten states I quoted from 9/95,
219# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
220# (UTC-4).... The other two time zones given for Brazil are BR3, which is
221# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
222# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
223# become part of the state of Pernambuco). The boundary between BR1 and BR2
224# has never been clearly stated. They've simply been called East and West.
225# However, some conclusions can be drawn from another IATA manual: the Airline
226# Coding Directory, which lists close to 400 airports in Brazil. For each
227# airport it gives a time zone which is coded to the SSIM. From that
228# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
229# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
230# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
231
232# From Marcos Tadeu (1998-09-27):
233# <a href="http://pcdsh01.on.br/verao1.html">
234# Brazilian official page
235# </a>
236#
237# From Paul Eggert (1998-10-29):
238# The official decrees referenced below are taken from
239# <a href="http://pcdsh01.on.br/DecHV.html">
240# Decretos sobre o Horario de Verao no Brasil
241# </a> (1999-10-04, in Portuguese).
242
243# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
244# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
245# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
246Rule Brazil 1931 only - Oct 3 11:00 1:00 S
247Rule Brazil 1932 1933 - Apr 1 0:00 0 -
248Rule Brazil 1932 only - Oct 3 0:00 1:00 S
249# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
250# revoked DST.
251# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
252# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
253Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
254Rule Brazil 1950 only - Apr 16 1:00 0 -
255Rule Brazil 1951 1952 - Apr 1 0:00 0 -
256# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
257Rule Brazil 1953 only - Mar 1 0:00 0 -
258# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
259# revoked DST.
260# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
261# established DST from 1963-10-23 00:00 to 1964-02-29 00:00
262# in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
263# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
264# extended the above decree to all of the national territory on 12-09.
265Rule Brazil 1963 only - Dec 9 0:00 1:00 S
266# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
267# extended summer time by one day to 1964-03-01 00:00 (start of school).
268Rule Brazil 1964 only - Mar 1 0:00 0 -
269# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
270Rule Brazil 1965 only - Jan 31 0:00 1:00 S
271Rule Brazil 1965 only - Mar 31 0:00 0 -
272# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
273Rule Brazil 1965 only - Dec 1 0:00 1:00 S
274# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
275Rule Brazil 1966 1968 - Mar 1 0:00 0 -
276Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
277# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
278# revoked DST.
279# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
280Rule Brazil 1985 only - Nov 2 0:00 1:00 S
281# Decree 92,310 (1986-01-21)
282# Decree 92,463 (1986-03-13)
283Rule Brazil 1986 only - Mar 15 0:00 0 -
284# Decree 93,316 (1986-10-01)
285Rule Brazil 1986 only - Oct 25 0:00 1:00 S
286Rule Brazil 1987 only - Feb 14 0:00 0 -
287# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
288Rule Brazil 1987 only - Oct 25 0:00 1:00 S
289Rule Brazil 1988 only - Feb 7 0:00 0 -
290# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
291# except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
292Rule Brazil 1988 only - Oct 16 0:00 1:00 S
293Rule Brazil 1989 only - Jan 29 0:00 0 -
294# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
295# with the same exceptions
296Rule Brazil 1989 only - Oct 15 0:00 1:00 S
297Rule Brazil 1990 only - Feb 11 0:00 0 -
298# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
299# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
300# Decree 99,629 (1990-10-19) adds BA, MT.
301Rule Brazil 1990 only - Oct 21 0:00 1:00 S
302Rule Brazil 1991 only - Feb 17 0:00 0 -
303# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
304# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
305Rule Brazil 1991 only - Oct 20 0:00 1:00 S
306Rule Brazil 1992 only - Feb 9 0:00 0 -
307# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
308# adopted by same states.
309Rule Brazil 1992 only - Oct 25 0:00 1:00 S
310Rule Brazil 1993 only - Jan 31 0:00 0 -
311# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
312# adopted by same states, plus AM.
313# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22)
314# adopted by same states, minus AM.
315# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
316# adopted by same states, plus TO.
317# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
318# adds AL, SE.
319Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
320Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
321Rule Brazil 1996 only - Feb 11 0:00 0 -
322# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
323# adopted by same states, minus AL, SE.
324Rule Brazil 1996 only - Oct 6 0:00 1:00 S
325Rule Brazil 1997 only - Feb 16 0:00 0 -
326# From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12):
327# In 1997, the DS began on October 6. The stated reason was that
328# because international television networks ignored Brazil's policy on DS,
329# they bought the wrong times on satellite for coverage of Pope's visit.
330# This year, the ending date of DS was postponed to March 1
331# to help dealing with the shortages of electric power.
332#
333# From Paul Eggert (1998-02-25):
334# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm">
335# Brazil Prepares for Papal Visit
336# </a>,
337# Church Net UK (1997-10-02).
338#
339# Decree 2,317 (1997-09-04), adopted by same states.
340Rule Brazil 1997 only - Oct 6 0:00 1:00 S
341# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
342# (1998-02-10)
343Rule Brazil 1998 only - Mar 1 0:00 0 -
344# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
345# adopted by the same states as before.
346Rule Brazil 1998 only - Oct 11 0:00 1:00 S
347Rule Brazil 1999 only - Feb 21 0:00 0 -
348# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
349# (1999-08-23) adopted by same states.
350# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
351# adds SE, AL, PE, PR, RN, CE, PI, MA and RR.
352# These give only one year's rules. After that, the rules are guesses
353# and are quite possibly wrong, but are more likely than no DST at all.
354Rule Brazil 1999 max - Oct Sun>=1 0:00 1:00 S
355Rule Brazil 2000 max - Feb lastSun 0:00 0 -
356
357
358# Zone NAME GMTOFF RULES FORMAT [UNTIL]
359#
360# Fernando de Noronha
361Zone America/Noronha -2:09:40 - LMT 1914
362 -2:00 Brazil FN%sT 1990 Sep 17
363 -2:00 - FNT
364#
365# Amapa (AP), east Para (PA)
366Zone America/Belem -3:13:56 - LMT 1914
367 -3:00 Brazil BR%sT 1988 Sep 12
368 -3:00 - BRT
369#
370# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
371# Paraiba (PB), Pernambuco (PE) (except Fernando de Noronha)
372Zone America/Fortaleza -2:34:00 - LMT 1914
373 -3:00 Brazil BR%sT 1990 Sep 17
374 -3:00 - BRT 1999 Sep 30
375 -3:00 Brazil BR%sT
376#
377# Tocantins (TO)
378Zone America/Araguaina -3:12:48 - LMT 1914
379 -3:00 Brazil BR%sT 1990 Sep 17
380 -3:00 - BRT 1995 Sep 14
381 -3:00 Brazil BR%sT
382#
383# Alagoas (AL), Sergipe (SE)
384Zone America/Maceio -2:22:52 - LMT 1914
385 -3:00 Brazil BR%sT 1990 Sep 17
386 -3:00 - BRT 1995 Oct 13
387 -3:00 Brazil BR%sT 1996 Sep 4
388 -3:00 - BRT 1999 Sep 30
389 -3:00 Brazil BR%sT
390#
391# Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
392# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
393# Santa Catarina (SC), Rio Grande do Sul (RS)
394Zone America/Sao_Paulo -3:06:28 - LMT 1914
395 -3:00 Brazil BR%sT 1963 Oct 23 00:00
396 -3:00 1:00 BRST 1964
397 -3:00 Brazil BR%sT
398#
399# Mato Grosso, Mato Grosso do Sul
400Zone America/Cuiaba -3:44:20 - LMT 1914
401 -4:00 Brazil AM%sT
402#
403# west Para (PA), Rondonia (RO)
404Zone America/Porto_Velho -4:15:36 - LMT 1914
405 -4:00 Brazil AM%sT 1988 Sep 12
406 -4:00 - AMT
407#
408# Roraima (RR)
409Zone America/Boa_Vista -4:02:40 - LMT 1914
410 -4:00 Brazil AM%sT 1988 Sep 12
411 -4:00 - AMT 1999 Sep 30
412 -4:00 Brazil AM%sT
413#
414# Amazonas (AM)
415Zone America/Manaus -4:00:04 - LMT 1914
416 -4:00 Brazil AM%sT 1988 Sep 12
417 -4:00 - AMT 1993 Sep 28
418 -4:00 Brazil AM%sT 1994 Sep 22
419 -4:00 - AMT
420#
421# Acre (AC)
422# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
423Zone America/Porto_Acre -4:31:12 - LMT 1914
424 -5:00 Brazil AC%sT 1988 Sep 12
425 -5:00 - ACT
426#
427# Martin Vaz and Trindade are like America/Noronha.
428
429
430# Chile
431
432# From Eduardo Krell (1995-10-19):
433# The law says to switch to DST at midnight [24:00] on the second SATURDAY
434# of October.... The law is the same for March and October.
435# (1998-09-29):
436# Because of the drought this year, the government decided to go into
437# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
438# (unless there's another dry season next year, I guess).
439
440# From Julio I. Pacheco Troncoso (1999-03-18):
441# Because of the same drought, the government decided to end DST later,
442# on April 3, (one-time change).
443
444# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
445Rule Chile 1918 only - Sep 1 0:00 1:00 S
446Rule Chile 1919 only - Jul 2 0:00 0 -
447Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
448Rule Chile 1928 1932 - Apr 1 0:00 0 -
449Rule Chile 1969 1997 - Oct Sun>=9 0:00 1:00 S
450Rule Chile 1970 1998 - Mar Sun>=9 0:00 0 -
451Rule Chile 1998 only - Sep 27 0:00 1:00 S
452Rule Chile 1999 only - Apr 4 0:00 0 -
453Rule Chile 1999 max - Oct Sun>=9 0:00 1:00 S
454Rule Chile 2000 max - Mar Sun>=9 0:00 0 -
455# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
456# (1996-09) says 1998-03-08. Ignore these.
457# Zone NAME GMTOFF RULES FORMAT [UNTIL]
458Zone America/Santiago -4:42:40 - LMT 1890
459 -4:42:40 - SMT 1910 # Santiago Mean Time
460 -5:00 Chile CL%sT 1932 Sep # Chile Time
461 -4:00 Chile CL%sT
462Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
463 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
464 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
465 -6:00 Chile EAS%sT
466#
467# Whitman says Juan Fernandez Is are like America/Santiago.
468# San Ambrosio, San Felix
469# no information; probably like America/Santiago
470
471
472# Colombia
473# Shanks specifies 24:00 for 1992 transition times; go with IATA,
474# as it seems implausible to change clocks at midnight New Year's Eve.
475# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
476Rule CO 1992 only - May 2 0:00 1:00 S
477Rule CO 1992 only - Dec 31 0:00 0 -
478# Zone NAME GMTOFF RULES FORMAT [UNTIL]
479Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
480 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
481 -5:00 CO CO%sT # Colombia Time
482# Malpelo, Providencia, San Andres
483# no information; probably like America/Bogota
484
485# Curacao
486# Shanks says that Bottom and Oranjestad have been at -4:00 since
487# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
488# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
489# This all predates our 1970 cutoff, though.
490# Zone NAME GMTOFF RULES FORMAT [UNTIL]
491Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
492 -4:30 - ANT 1965 # Netherlands Antilles Time
493 -4:00 - AST
494
495# Ecuador
496# Zone NAME GMTOFF RULES FORMAT [UNTIL]
497Zone America/Guayaquil -5:19:20 - LMT 1890
498 -5:14:00 - QMT 1931 # Quito Mean Time
499 -5:00 - ECT # Ecuador Time
500Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
501 -5:00 - ECT 1986
502 -6:00 - GALT # Galapagos Time
503
504# Falklands
505# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
506Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
507Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
508Rule Falk 1939 only - Oct 1 0:00 1:00 S
509Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
510Rule Falk 1943 only - Jan 1 0:00 0 -
511Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
512Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
513Rule Falk 1984 only - Sep 16 0:00 1:00 S
514Rule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S
515Rule Falk 1986 max - Apr Sun>=16 0:00 0 -
516Rule Falk 1996 max - Sep Sun>=8 0:00 1:00 S
517# Zone NAME GMTOFF RULES FORMAT [UNTIL]
518Zone Atlantic/Stanley -3:51:24 - LMT 1890
519 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
520 -4:00 Falk FK%sT 1983 May # Falkland Is Time
521 -3:00 Falk FK%sT 1985 Sep 15
522 -4:00 Falk FK%sT
523
524# French Guiana
525# Zone NAME GMTOFF RULES FORMAT [UNTIL]
526Zone America/Cayenne -3:29:20 - LMT 1911 Jul
527 -4:00 - GFT 1967 Oct # French Guiana Time
528 -3:00 - GFT
529
530# Guyana
531# Zone NAME GMTOFF RULES FORMAT [UNTIL]
532Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
533 -3:45 - GBGT 1966 May 26 # Br Guiana Time
534 -3:45 - GYT 1975 Jul 31 # Guyana Time
535 -3:00 - GYT 1991
536# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
537 -4:00 - GYT
538
539# Paraguay
540# From Paul Eggert (1999-10-29):
541# Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
542# and autumn transitions are from 00:00 -> 23:00. Go with earlier
543# editions of Shanks, and with the IATA, who say transitions occur at 00:00.
544# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
545Rule Para 1975 1988 - Oct 1 0:00 1:00 S
546Rule Para 1975 1978 - Mar 1 0:00 0 -
547Rule Para 1979 1991 - Apr 1 0:00 0 -
548Rule Para 1989 only - Oct 22 0:00 1:00 S
549Rule Para 1990 only - Oct 1 0:00 1:00 S
550Rule Para 1991 only - Oct 6 0:00 1:00 S
551Rule Para 1992 only - Mar 1 0:00 0 -
552Rule Para 1992 only - Oct 5 0:00 1:00 S
553Rule Para 1993 only - Mar 31 0:00 0 -
554Rule Para 1993 1995 - Oct 1 0:00 1:00 S
555Rule Para 1994 1995 - Feb lastSun 0:00 0 -
556Rule Para 1996 only - Mar 1 0:00 0 -
557# IATA SSIM (1997-09) says Mar 1; go with Shanks.
558Rule Para 1997 only - Feb lastSun 0:00 0 -
559Rule Para 1998 only - Mar 1 0:00 0 -
560Rule Para 1996 1998 - Oct Sun>=1 0:00 1:00 S
561# IATA SSIM (1999-02) says lastSat, not lastSun; (1999-09) reports no date;
562# go with Shanks.
563Rule Para 1999 max - Feb lastSun 0:00 0 -
564# IATA SSIM (2000-02) says 1999-10-10.
565Rule Para 1999 max - Oct Sun>=8 0:00 1:00 S
566# Zone NAME GMTOFF RULES FORMAT [UNTIL]
567Zone America/Asuncion -3:50:40 - LMT 1890
568 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
569 -4:00 - PYT 1972 Oct # Paraguay Time
570 -3:00 - PYT 1974 Apr
571 -4:00 Para PY%sT
572
573# Peru
574# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
575Rule Peru 1938 only - Jan 1 0:00 1:00 S
576Rule Peru 1938 only - Apr 1 0:00 0 -
577Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
578Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
579Rule Peru 1987 only - Jan 1 0:00 1:00 S
580Rule Peru 1987 only - Apr 1 0:00 0 -
581Rule Peru 1990 only - Jan 1 0:00 1:00 S
582Rule Peru 1990 only - Apr 1 0:00 0 -
583# IATA is ambiguous for 1993/1995; go with Shanks.
584Rule Peru 1994 only - Jan 1 0:00 1:00 S
585Rule Peru 1994 only - Apr 1 0:00 0 -
586# Zone NAME GMTOFF RULES FORMAT [UNTIL]
587Zone America/Lima -5:08:12 - LMT 1890
588 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
589 -5:00 Peru PE%sT # Peru Time
590
591# South Georgia
592# Zone NAME GMTOFF RULES FORMAT [UNTIL]
593Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
594 -2:00 - GST # South Georgia Time
595
596# South Sandwich Is
597# uninhabited; scientific personnel have wintered
598
599# Suriname
600# Zone NAME GMTOFF RULES FORMAT [UNTIL]
601Zone America/Paramaribo -3:40:40 - LMT 1911
602 -3:40:52 - PMT 1935 # Paramaribo Mean Time
603 -3:40:36 - PMT 1945 Oct # The capital moved?
604 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
605 -3:30 - SRT 1984 Oct # Suriname Time
606 -3:00 - SRT
607
608# Trinidad and Tobago
609# Zone NAME GMTOFF RULES FORMAT [UNTIL]
610Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
611 -4:00 - AST
612
613# Uruguay
614# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
615# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
616# From Shanks:
617# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
618# Whitman gives 1923 Oct 1; go with Shanks.
619Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
620Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
621Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
622Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
623# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
624Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
625Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
626Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
627# Whitman gives 1937 Oct 3; go with Shanks.
628Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
629# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
630# and 1943 Apr 13 ``to present time''; go with Shanks.
631Rule Uruguay 1941 only - Aug 1 0:00 0 -
632Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
633Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
634Rule Uruguay 1943 only - Mar 14 0:00 0 -
635Rule Uruguay 1959 only - May 24 0:00 1:00 S
636Rule Uruguay 1959 only - Nov 15 0:00 0 -
637Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
638Rule Uruguay 1960 only - Mar 6 0:00 0 -
639Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
640Rule Uruguay 1965 only - Sep 26 0:00 0 -
641Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
642Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
643Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
644Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
645Rule Uruguay 1972 only - Aug 15 0:00 0 -
646Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
647Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
648Rule Uruguay 1976 only - Oct 1 0:00 0 -
649Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
650Rule Uruguay 1978 only - Apr 1 0:00 0 -
651Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
652Rule Uruguay 1980 only - May 1 0:00 0 -
653Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
654Rule Uruguay 1988 only - Mar 14 0:00 0 -
655Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
656Rule Uruguay 1989 only - Mar 12 0:00 0 -
657Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
658# Shanks says no DST was observed in 1990/1 and 1991/2,
659# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
660Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
661Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
662Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
663Rule Uruguay 1993 only - Feb 28 0:00 0 -
664# Zone NAME GMTOFF RULES FORMAT [UNTIL]
665Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
666 -3:44:44 - MMT 1920 May 1 # Montevideo MT
667 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
668 -3:00 Uruguay UY%sT
669
670# Venezuela
671# Zone NAME GMTOFF RULES FORMAT [UNTIL]
672Zone America/Caracas -4:27:44 - LMT 1890
673 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
674 -4:30 - VET 1965 # Venezuela Time
675 -4:00 - VET
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 Paul Eggert (1998-10-29):
256# The official decrees referenced below are taken from
257# <a href="http://pcdsh01.on.br/DecHV.html">
258# Decretos sobre o Horario de Verao no Brasil
259# </a> (1999-10-04, in Portuguese).
260
261# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
262# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
263# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
264Rule Brazil 1931 only - Oct 3 11:00 1:00 S
265Rule Brazil 1932 1933 - Apr 1 0:00 0 -
266Rule Brazil 1932 only - Oct 3 0:00 1:00 S
267# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
268# revoked DST.
269# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
270# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
271Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
272Rule Brazil 1950 only - Apr 16 1:00 0 -
273Rule Brazil 1951 1952 - Apr 1 0:00 0 -
274# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
275Rule Brazil 1953 only - Mar 1 0:00 0 -
276# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
277# revoked DST.
278# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
279# established DST from 1963-10-23 00:00 to 1964-02-29 00:00
280# in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
281# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
282# extended the above decree to all of the national territory on 12-09.
283Rule Brazil 1963 only - Dec 9 0:00 1:00 S
284# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
285# extended summer time by one day to 1964-03-01 00:00 (start of school).
286Rule Brazil 1964 only - Mar 1 0:00 0 -
287# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
288Rule Brazil 1965 only - Jan 31 0:00 1:00 S
289Rule Brazil 1965 only - Mar 31 0:00 0 -
290# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
291Rule Brazil 1965 only - Dec 1 0:00 1:00 S
292# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
293Rule Brazil 1966 1968 - Mar 1 0:00 0 -
294Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
295# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
296# revoked DST.
297# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
298Rule Brazil 1985 only - Nov 2 0:00 1:00 S
299# Decree 92,310 (1986-01-21)
300# Decree 92,463 (1986-03-13)
301Rule Brazil 1986 only - Mar 15 0:00 0 -
302# Decree 93,316 (1986-10-01)
303Rule Brazil 1986 only - Oct 25 0:00 1:00 S
304Rule Brazil 1987 only - Feb 14 0:00 0 -
305# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
306Rule Brazil 1987 only - Oct 25 0:00 1:00 S
307Rule Brazil 1988 only - Feb 7 0:00 0 -
308# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
309# except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
310Rule Brazil 1988 only - Oct 16 0:00 1:00 S
311Rule Brazil 1989 only - Jan 29 0:00 0 -
312# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
313# with the same exceptions
314Rule Brazil 1989 only - Oct 15 0:00 1:00 S
315Rule Brazil 1990 only - Feb 11 0:00 0 -
316# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
317# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
318# Decree 99,629 (1990-10-19) adds BA, MT.
319Rule Brazil 1990 only - Oct 21 0:00 1:00 S
320Rule Brazil 1991 only - Feb 17 0:00 0 -
321# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
322# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
323Rule Brazil 1991 only - Oct 20 0:00 1:00 S
324Rule Brazil 1992 only - Feb 9 0:00 0 -
325# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
326# adopted by same states.
327Rule Brazil 1992 only - Oct 25 0:00 1:00 S
328Rule Brazil 1993 only - Jan 31 0:00 0 -
329# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
330# adopted by same states, plus AM.
331# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22)
332# adopted by same states, minus AM.
333# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
334# adopted by same states, plus TO.
335# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
336# adds AL, SE.
337Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
338Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
339Rule Brazil 1996 only - Feb 11 0:00 0 -
340# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
341# adopted by same states, minus AL, SE.
342Rule Brazil 1996 only - Oct 6 0:00 1:00 S
343Rule Brazil 1997 only - Feb 16 0:00 0 -
344# From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12):
345# In 1997, the DS began on October 6. The stated reason was that
346# because international television networks ignored Brazil's policy on DS,
347# they bought the wrong times on satellite for coverage of Pope's visit.
348# This year, the ending date of DS was postponed to March 1
349# to help dealing with the shortages of electric power.
350#
351# From Paul Eggert (1998-02-25):
352# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm">
353# Brazil Prepares for Papal Visit
354# </a>,
355# Church Net UK (1997-10-02).
356#
357# Decree 2,317 (1997-09-04), adopted by same states.
358Rule Brazil 1997 only - Oct 6 0:00 1:00 S
359# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
360# (1998-02-10)
361Rule Brazil 1998 only - Mar 1 0:00 0 -
362# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
363# adopted by the same states as before.
364Rule Brazil 1998 only - Oct 11 0:00 1:00 S
365Rule Brazil 1999 only - Feb 21 0:00 0 -
366# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
367# (1999-08-23) adopted by same states.
368# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
369# adds SE, AL, PE, PR, RN, CE, PI, MA and RR.
370# These give only one year's rules. After that, the rules are guesses
371# and are quite possibly wrong, but are more likely than no DST at all.
372Rule Brazil 1999 max - Oct Sun>=1 0:00 1:00 S
373Rule Brazil 2000 max - Feb lastSun 0:00 0 -
374
375
376# Zone NAME GMTOFF RULES FORMAT [UNTIL]
377#
378# Fernando de Noronha
379Zone America/Noronha -2:09:40 - LMT 1914
380 -2:00 Brazil FN%sT 1990 Sep 17
381 -2:00 - FNT
382#
383# Amapa (AP), east Para (PA)
384Zone America/Belem -3:13:56 - LMT 1914
385 -3:00 Brazil BR%sT 1988 Sep 12
386 -3:00 - BRT
387#
388# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
389# Paraiba (PB), Pernambuco (PE) (except Fernando de Noronha)
390Zone America/Fortaleza -2:34:00 - LMT 1914
391 -3:00 Brazil BR%sT 1990 Sep 17
392 -3:00 - BRT 1999 Sep 30
393 -3:00 Brazil BR%sT
394#
395# Tocantins (TO)
396Zone America/Araguaina -3:12:48 - LMT 1914
397 -3:00 Brazil BR%sT 1990 Sep 17
398 -3:00 - BRT 1995 Sep 14
399 -3:00 Brazil BR%sT
400#
401# Alagoas (AL), Sergipe (SE)
402Zone America/Maceio -2:22:52 - LMT 1914
403 -3:00 Brazil BR%sT 1990 Sep 17
404 -3:00 - BRT 1995 Oct 13
405 -3:00 Brazil BR%sT 1996 Sep 4
406 -3:00 - BRT 1999 Sep 30
407 -3:00 Brazil BR%sT
408#
409# Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
410# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
411# Santa Catarina (SC), Rio Grande do Sul (RS)
412Zone America/Sao_Paulo -3:06:28 - LMT 1914
413 -3:00 Brazil BR%sT 1963 Oct 23 00:00
414 -3:00 1:00 BRST 1964
415 -3:00 Brazil BR%sT
416#
417# Mato Grosso, Mato Grosso do Sul
418Zone America/Cuiaba -3:44:20 - LMT 1914
419 -4:00 Brazil AM%sT
420#
421# west Para (PA), Rondonia (RO)
422Zone America/Porto_Velho -4:15:36 - LMT 1914
423 -4:00 Brazil AM%sT 1988 Sep 12
424 -4:00 - AMT
425#
426# Roraima (RR)
427Zone America/Boa_Vista -4:02:40 - LMT 1914
428 -4:00 Brazil AM%sT 1988 Sep 12
429 -4:00 - AMT 1999 Sep 30
430 -4:00 Brazil AM%sT
431#
432# Amazonas (AM)
433Zone America/Manaus -4:00:04 - LMT 1914
434 -4:00 Brazil AM%sT 1988 Sep 12
435 -4:00 - AMT 1993 Sep 28
436 -4:00 Brazil AM%sT 1994 Sep 22
437 -4:00 - AMT
438#
439# Acre (AC)
440# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
441Zone America/Porto_Acre -4:31:12 - LMT 1914
442 -5:00 Brazil AC%sT 1988 Sep 12
443 -5:00 - ACT
444#
445# Martin Vaz and Trindade are like America/Noronha.
446
447
448# Chile
449
450# From Eduardo Krell (1995-10-19):
451# The law says to switch to DST at midnight [24:00] on the second SATURDAY
452# of October.... The law is the same for March and October.
453# (1998-09-29):
454# Because of the drought this year, the government decided to go into
455# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
456# (unless there's another dry season next year, I guess).
457
458# From Julio I. Pacheco Troncoso (1999-03-18):
459# Because of the same drought, the government decided to end DST later,
460# on April 3, (one-time change).
461
462# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
463Rule Chile 1918 only - Sep 1 0:00 1:00 S
464Rule Chile 1919 only - Jul 2 0:00 0 -
465Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
466Rule Chile 1928 1932 - Apr 1 0:00 0 -
467Rule Chile 1969 1997 - Oct Sun>=9 0:00 1:00 S
468Rule Chile 1970 1998 - Mar Sun>=9 0:00 0 -
469Rule Chile 1998 only - Sep 27 0:00 1:00 S
470Rule Chile 1999 only - Apr 4 0:00 0 -
471Rule Chile 1999 max - Oct Sun>=9 0:00 1:00 S
472Rule Chile 2000 max - Mar Sun>=9 0:00 0 -
473# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
474# (1996-09) says 1998-03-08. Ignore these.
475# Zone NAME GMTOFF RULES FORMAT [UNTIL]
476Zone America/Santiago -4:42:40 - LMT 1890
477 -4:42:40 - SMT 1910 # Santiago Mean Time
478 -5:00 Chile CL%sT 1932 Sep # Chile Time
479 -4:00 Chile CL%sT
480Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
481 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
482 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
483 -6:00 Chile EAS%sT
484#
485# Whitman says Juan Fernandez Is are like America/Santiago.
486# San Ambrosio, San Felix
487# no information; probably like America/Santiago
488
489
490# Colombia
491# Shanks specifies 24:00 for 1992 transition times; go with IATA,
492# as it seems implausible to change clocks at midnight New Year's Eve.
493# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
494Rule CO 1992 only - May 2 0:00 1:00 S
495Rule CO 1992 only - Dec 31 0:00 0 -
496# Zone NAME GMTOFF RULES FORMAT [UNTIL]
497Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
498 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
499 -5:00 CO CO%sT # Colombia Time
500# Malpelo, Providencia, San Andres
501# no information; probably like America/Bogota
502
503# Curacao
504# Shanks says that Bottom and Oranjestad have been at -4:00 since
505# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
506# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
507# This all predates our 1970 cutoff, though.
508# Zone NAME GMTOFF RULES FORMAT [UNTIL]
509Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
510 -4:30 - ANT 1965 # Netherlands Antilles Time
511 -4:00 - AST
512
513# Ecuador
514# Zone NAME GMTOFF RULES FORMAT [UNTIL]
515Zone America/Guayaquil -5:19:20 - LMT 1890
516 -5:14:00 - QMT 1931 # Quito Mean Time
517 -5:00 - ECT # Ecuador Time
518Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
519 -5:00 - ECT 1986
520 -6:00 - GALT # Galapagos Time
521
522# Falklands
523# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
524Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
525Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
526Rule Falk 1939 only - Oct 1 0:00 1:00 S
527Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
528Rule Falk 1943 only - Jan 1 0:00 0 -
529Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
530Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
531Rule Falk 1984 only - Sep 16 0:00 1:00 S
532Rule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S
533Rule Falk 1986 max - Apr Sun>=16 0:00 0 -
534Rule Falk 1996 max - Sep Sun>=8 0:00 1:00 S
535# Zone NAME GMTOFF RULES FORMAT [UNTIL]
536Zone Atlantic/Stanley -3:51:24 - LMT 1890
537 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
538 -4:00 Falk FK%sT 1983 May # Falkland Is Time
539 -3:00 Falk FK%sT 1985 Sep 15
540 -4:00 Falk FK%sT
541
542# French Guiana
543# Zone NAME GMTOFF RULES FORMAT [UNTIL]
544Zone America/Cayenne -3:29:20 - LMT 1911 Jul
545 -4:00 - GFT 1967 Oct # French Guiana Time
546 -3:00 - GFT
547
548# Guyana
549# Zone NAME GMTOFF RULES FORMAT [UNTIL]
550Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
551 -3:45 - GBGT 1966 May 26 # Br Guiana Time
552 -3:45 - GYT 1975 Jul 31 # Guyana Time
553 -3:00 - GYT 1991
554# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
555 -4:00 - GYT
556
557# Paraguay
558# From Paul Eggert (1999-10-29):
559# Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
560# and autumn transitions are from 00:00 -> 23:00. Go with earlier
561# editions of Shanks, and with the IATA, who say transitions occur at 00:00.
562# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
563Rule Para 1975 1988 - Oct 1 0:00 1:00 S
564Rule Para 1975 1978 - Mar 1 0:00 0 -
565Rule Para 1979 1991 - Apr 1 0:00 0 -
566Rule Para 1989 only - Oct 22 0:00 1:00 S
567Rule Para 1990 only - Oct 1 0:00 1:00 S
568Rule Para 1991 only - Oct 6 0:00 1:00 S
569Rule Para 1992 only - Mar 1 0:00 0 -
570Rule Para 1992 only - Oct 5 0:00 1:00 S
571Rule Para 1993 only - Mar 31 0:00 0 -
572Rule Para 1993 1995 - Oct 1 0:00 1:00 S
573Rule Para 1994 1995 - Feb lastSun 0:00 0 -
574Rule Para 1996 only - Mar 1 0:00 0 -
575# IATA SSIM (1997-09) says Mar 1; go with Shanks.
576Rule Para 1997 only - Feb lastSun 0:00 0 -
577Rule Para 1998 only - Mar 1 0:00 0 -
578Rule Para 1996 1998 - Oct Sun>=1 0:00 1:00 S
579# IATA SSIM (1999-02) says lastSat, not lastSun; (1999-09) reports no date;
580# go with Shanks.
581Rule Para 1999 max - Feb lastSun 0:00 0 -
582# IATA SSIM (2000-02) says 1999-10-10.
583Rule Para 1999 max - Oct Sun>=8 0:00 1:00 S
584# Zone NAME GMTOFF RULES FORMAT [UNTIL]
585Zone America/Asuncion -3:50:40 - LMT 1890
586 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
587 -4:00 - PYT 1972 Oct # Paraguay Time
588 -3:00 - PYT 1974 Apr
589 -4:00 Para PY%sT
590
591# Peru
592# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
593Rule Peru 1938 only - Jan 1 0:00 1:00 S
594Rule Peru 1938 only - Apr 1 0:00 0 -
595Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
596Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
597Rule Peru 1987 only - Jan 1 0:00 1:00 S
598Rule Peru 1987 only - Apr 1 0:00 0 -
599Rule Peru 1990 only - Jan 1 0:00 1:00 S
600Rule Peru 1990 only - Apr 1 0:00 0 -
601# IATA is ambiguous for 1993/1995; go with Shanks.
602Rule Peru 1994 only - Jan 1 0:00 1:00 S
603Rule Peru 1994 only - Apr 1 0:00 0 -
604# Zone NAME GMTOFF RULES FORMAT [UNTIL]
605Zone America/Lima -5:08:12 - LMT 1890
606 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
607 -5:00 Peru PE%sT # Peru Time
608
609# South Georgia
610# Zone NAME GMTOFF RULES FORMAT [UNTIL]
611Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
612 -2:00 - GST # South Georgia Time
613
614# South Sandwich Is
615# uninhabited; scientific personnel have wintered
616
617# Suriname
618# Zone NAME GMTOFF RULES FORMAT [UNTIL]
619Zone America/Paramaribo -3:40:40 - LMT 1911
620 -3:40:52 - PMT 1935 # Paramaribo Mean Time
621 -3:40:36 - PMT 1945 Oct # The capital moved?
622 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
623 -3:30 - SRT 1984 Oct # Suriname Time
624 -3:00 - SRT
625
626# Trinidad and Tobago
627# Zone NAME GMTOFF RULES FORMAT [UNTIL]
628Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
629 -4:00 - AST
630
631# Uruguay
632# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
633# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
634# From Shanks:
635# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
636# Whitman gives 1923 Oct 1; go with Shanks.
637Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
638Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
639Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
640Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
641# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
642Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
643Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
644Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
645# Whitman gives 1937 Oct 3; go with Shanks.
646Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
647# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
648# and 1943 Apr 13 ``to present time''; go with Shanks.
649Rule Uruguay 1941 only - Aug 1 0:00 0 -
650Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
651Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
652Rule Uruguay 1943 only - Mar 14 0:00 0 -
653Rule Uruguay 1959 only - May 24 0:00 1:00 S
654Rule Uruguay 1959 only - Nov 15 0:00 0 -
655Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
656Rule Uruguay 1960 only - Mar 6 0:00 0 -
657Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
658Rule Uruguay 1965 only - Sep 26 0:00 0 -
659Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
660Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
661Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
662Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
663Rule Uruguay 1972 only - Aug 15 0:00 0 -
664Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
665Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
666Rule Uruguay 1976 only - Oct 1 0:00 0 -
667Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
668Rule Uruguay 1978 only - Apr 1 0:00 0 -
669Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
670Rule Uruguay 1980 only - May 1 0:00 0 -
671Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
672Rule Uruguay 1988 only - Mar 14 0:00 0 -
673Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
674Rule Uruguay 1989 only - Mar 12 0:00 0 -
675Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
676# Shanks says no DST was observed in 1990/1 and 1991/2,
677# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
678Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
679Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
680Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
681Rule Uruguay 1993 only - Feb 28 0:00 0 -
682# Zone NAME GMTOFF RULES FORMAT [UNTIL]
683Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
684 -3:44:44 - MMT 1920 May 1 # Montevideo MT
685 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
686 -3:00 Uruguay UY%sT
687
688# Venezuela
689# Zone NAME GMTOFF RULES FORMAT [UNTIL]
690Zone America/Caracas -4:27:44 - LMT 1890
691 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
692 -4:30 - VET 1965 # Venezuela Time
693 -4:00 - VET