Deleted Added
sdiff udiff text old ( 20094 ) new ( 21217 )
full compact
southamerica (20094) southamerica (21217)
1# @(#)southamerica 7.15
1# @(#)southamerica 7.16
2
3# This data is by no means authoritative; if you think you know better,
4# go ahead and edit the file (and please send any changes to
5# tz@elsie.nci.nih.gov for general use in the future).
6
7# From Paul Eggert <eggert@twinsun.com> (1996-11-22):
8# A good source for time zone historical data outside the U.S. is
9# Thomas G. Shanks, The International Atlas (3rd edition),
10# San Diego: ACS Publications, Inc. (1991).
11#
12# Gwillim Law <LAW@encmail.encompass.com> writes that a good source
13# for recent time zone data is the International Air Transport
14# Association's Standard Schedules Information Manual (IATA SSIM),
15# published semiannually. Law sent in several helpful summaries
16# of the IATA's data after 1990.
17#
18# Except where otherwise noted, Shanks is the source for entries through 1990,
19# and IATA SSIM is the source for entries after 1990.
20#
21# The following abbreviations are used in this file.
22# Corrections are welcome!
23# std dst
24# LMT Local Mean Time
25# -2:00 FST FDT Fernando de Noronha
26# -3:00 EST EDT Eastern Brazil
27# -4:00 WST WDT Western Brazil
28# -4:00 AST ADT Atlantic
29# -5:00 AST ADT Acre
30#
31# See the `africa' file for time zone naming and abbreviation conventions.
32# Earlier editions of these tables used the North American style (e.g. ARST and
33# ARDT for Argentine Standard and Daylight Time), but the following quote
34# suggests that it's better to use European style (e.g. ART and ARST).
35# I suggest the use of _Summer time_ instead of the more cumbersome
36# _daylight-saving time_. _Summer time_ seems to be in general use
37# in Europe and South America.
38# -- E O Cutler, _New York Times_ (1937-02-14), quoted in
39# H L Mencken, _The American Language: Supplement I_ (1960), p 466
40
41
42# From Guy Harris:
43# From Official Airline Guide - Worldwide Edition (1987). Countries not
44# listed here do not observe DST, according to the OAG. Time zone names
45# are pure inventions, and none are supplied for countries not observing
46# DST; updates from natives would be appreciated. The times that DST
47# starts and ends are based on the assumption that they switch a 2AM just
48# as everybody else does.
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):
2
3# This data is by no means authoritative; if you think you know better,
4# go ahead and edit the file (and please send any changes to
5# tz@elsie.nci.nih.gov for general use in the future).
6
7# From Paul Eggert <eggert@twinsun.com> (1996-11-22):
8# A good source for time zone historical data outside the U.S. is
9# Thomas G. Shanks, The International Atlas (3rd edition),
10# San Diego: ACS Publications, Inc. (1991).
11#
12# Gwillim Law <LAW@encmail.encompass.com> writes that a good source
13# for recent time zone data is the International Air Transport
14# Association's Standard Schedules Information Manual (IATA SSIM),
15# published semiannually. Law sent in several helpful summaries
16# of the IATA's data after 1990.
17#
18# Except where otherwise noted, Shanks is the source for entries through 1990,
19# and IATA SSIM is the source for entries after 1990.
20#
21# The following abbreviations are used in this file.
22# Corrections are welcome!
23# std dst
24# LMT Local Mean Time
25# -2:00 FST FDT Fernando de Noronha
26# -3:00 EST EDT Eastern Brazil
27# -4:00 WST WDT Western Brazil
28# -4:00 AST ADT Atlantic
29# -5:00 AST ADT Acre
30#
31# See the `africa' file for time zone naming and abbreviation conventions.
32# Earlier editions of these tables used the North American style (e.g. ARST and
33# ARDT for Argentine Standard and Daylight Time), but the following quote
34# suggests that it's better to use European style (e.g. ART and ARST).
35# I suggest the use of _Summer time_ instead of the more cumbersome
36# _daylight-saving time_. _Summer time_ seems to be in general use
37# in Europe and South America.
38# -- E O Cutler, _New York Times_ (1937-02-14), quoted in
39# H L Mencken, _The American Language: Supplement I_ (1960), p 466
40
41
42# From Guy Harris:
43# From Official Airline Guide - Worldwide Edition (1987). Countries not
44# listed here do not observe DST, according to the OAG. Time zone names
45# are pure inventions, and none are supplied for countries not observing
46# DST; updates from natives would be appreciated. The times that DST
47# starts and ends are based on the assumption that they switch a 2AM just
48# as everybody else does.
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 Argentinian time zone table...
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<=7 0:00 1:00 S
86Rule Arg 1968 1969 - Apr Sun<=7 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<=7 0:00 1:00 S
90Rule Arg 1975 1977 - Apr Sun<=7 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
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<=7 0:00 1:00 S
86Rule Arg 1968 1969 - Apr Sun<=7 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<=7 0:00 1:00 S
90Rule Arg 1975 1977 - Apr Sun<=7 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# (Argentinian Naval Hydrography Institute)
102# (Argentine Naval Hydrography Institute)
103#
104# Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; 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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
114#
115# Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC),
116# Tierra del Fuego (TF) & Antartida e Islas
117Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
118 -4:16:44 - CMT 1920 May # Cordoba Mean Time
119 -4:00 - ART 1930 Dec
120 -4:00 Arg AR%sT 1969 Oct 5
121 -3:00 Arg AR%sT
122#
123# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
124# Formosa (FM), La Pampa (LP), Chubut (CH)
125Zone America/Rosario -4:02:40 - LMT 1894 Nov
126 -4:16:44 - CMT 1920 May
127 -4:00 - ART 1930 Dec
128 -4:00 Arg AR%sT 1969 Oct 5
129 -3:00 Arg AR%sT 1991 Jul
130 -3:00 - ART
131#
132# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL),
133# Neuquen (NQ), Rio Negro (RN)
134Zone America/Cordoba -4:16:44 - LMT 1894 Nov
135 -4:16:44 - CMT 1920 May
136 -4:00 - ART 1930 Dec
137 -4:00 Arg AR%sT 1969 Oct 5
138 -3:00 Arg AR%sT 1990 Jul
139 -3:00 - ART
140#
141# Jujuy (JY)
142Zone America/Jujuy -4:21:12 - LMT 1894 Nov
143 -4:16:44 - CMT 1920 May
144 -4:00 - ART 1930 Dec
145 -4:00 Arg AR%sT 1969 Oct 5
146 -3:00 Arg AR%sT 1991 Mar 3
147 -4:00 - WART 1991 Oct 6
148 -4:00 1:00 WARST 1992 Mar 15
149 -4:00 - WART 1992 Oct 18
150 -3:00 - ART
151#
152# Catamarca (CT)
153Zone America/Catamarca -4:23:08 - 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 1990 Jul
158 -3:00 - ART 1991 Jul
159 -3:00 Arg AR%sT 1992 Jul
160 -3:00 - ART
161#
162# Mendoza (MZ)
163Zone America/Mendoza -4:35:16 - LMT 1894 Nov
164 -4:16:44 - CMT 1920 May
165 -4:00 - ART 1930 Dec
166 -4:00 Arg AR%sT 1969 Oct 5
167 -3:00 Arg AR%sT 1991 Mar 3
168 -4:00 - WART 1991 Oct 15
169 -4:00 1:00 WARST 1992 Mar 1
170 -4:00 - WART 1992 Oct 18
171 -3:00 - ART
172
173# Aruba
174# Zone NAME GMTOFF RULES FORMAT [UNTIL]
175Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
176 -4:30 - ANT 1965 # Netherlands Antilles Time
177 -4:00 - AST
178
179# Bolivia
180# Zone NAME GMTOFF RULES FORMAT [UNTIL]
181Zone America/La_Paz -4:32:36 - LMT 1890
182 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time
183 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
184 -4:00 - BOT # Bolivia Time
185
186# Brazil
187
188# From Guy Harris:
189# The OAG lists 1987-10-25 and 1988-02-12 as the starting and
190# ending dates, giving them as "estimated date(s) based on previous year". We
191# infer a rule here from one example, always a dangerous practice.... Yes,
192# they really do switch on Saturday, according to the OAG.
193# "[America/Porto_Acre]" is for the Territory of Acre;
194# "[America/Noronha]" is for Fernando De Noronha.
195
196# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
197# The mayor of Rio recently attempted to change the time zone rules
198# just in his city, in order to leave more summer time for the tourist trade.
199# The rule change lasted only part of the day;
200# the federal government refused to follow the city's rules, and business
201# was in a chaos, so the mayor backed down that afternoon.
202
203# From IATA SSIM (1996-02):
204# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
205# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
206# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
207# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
208# [The last three states are new to this issue of the IATA SSIM.]
209
210# From Gwillim Law (1996-10-07):
211# Geography, history (Tocantins was part of Goias until 1989), and other
212# sources of time zone information lead me to believe that AL, SE, and TO were
213# always in BR1, and so the only change was whether or not they observed DST....
214# The earliest issue of the SSIM I have is 2/91. Each issue from then until
215# 9/95 says that DST is observed only in the ten states I quoted from 9/95,
216# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
217# (UTC-4).... The other two time zones given for Brazil are BR3, which is
218# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
219# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
220# become part of the state of Pernambuco). The boundary between BR1 and BR2
221# has never been clearly stated. They've simply been called East and West.
222# However, some conclusions can be drawn from another IATA manual: the Airline
223# Coding Directory, which lists close to 400 airports in Brazil. For each
224# airport it gives a time zone which is coded to the SSIM. From that
225# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
226# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
227# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
228
229# From Paul Eggert (1996-11-22):
230# Let's make the following assumptions:
231#
232# * All data in Shanks are correct through 1990. In particular,
233# Shanks was right when he said Acre stopped observing DST in mid-1988.
234# * Areas where Shanks reports DST up to 1990, but the IATA reports no DST
235# in 1995, stopped observing DST in mid-1990.
236#
237# Under these assumptions Brazil needs 7 entries to cover all the distinct
238# time zone histories since 1970:
239#
240# Noronha (UTC-2), Fortaleza (UTC-3), and Manaus (UTC-4) stopped observing DST
241# in mid-1990.
242# Maceio (UTC-3) stopped observing DST in mid-1990, but started again mid-1995.
243# Sao Paulo (UTC-3) and Cuiaba (UTC-4) always observed DST.
244# Porto Acre (UTC-5) stopped observing DST in mid-1988.
245
246# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
247Rule Brazil 1931 only - Oct 3 11:00 1:00 D
248Rule Brazil 1932 1933 - Apr 1 0:00 0 S
249Rule Brazil 1932 only - Oct 3 0:00 1:00 D
250Rule Brazil 1949 1952 - Dec 1 0:00 1:00 D
251Rule Brazil 1950 only - Apr 16 0:00 0 S
252Rule Brazil 1951 1953 - Apr 1 0:00 0 S
253Rule Brazil 1963 only - Dec 9 0:00 1:00 D
254Rule Brazil 1964 only - Mar 1 0:00 0 S
255Rule Brazil 1965 only - Jan 31 0:00 1:00 D
256Rule Brazil 1965 only - Apr 1 0:00 0 S
257Rule Brazil 1965 only - Dec 1 0:00 1:00 D
258Rule Brazil 1966 1968 - Mar 1 0:00 0 S
259Rule Brazil 1966 1967 - Nov 1 0:00 1:00 D
260Rule Brazil 1985 only - Nov 2 0:00 1:00 D
261Rule Brazil 1986 only - Mar 15 0:00 0 S
262Rule Brazil 1986 1987 - Oct Sat<=28 0:00 1:00 D
263Rule Brazil 1987 only - Feb 14 0:00 0 S
264Rule Brazil 1988 only - Feb 7 0:00 0 S
265Rule Brazil 1989 only - Jan 22 0:00 0 S
266Rule Brazil 1988 1989 - Oct Sun>=10 0:00 1:00 D
267Rule Brazil 1990 1991 - Feb Sun>=11 0:00 0 S
268Rule Brazil 1990 1992 - Oct Sun>=20 0:00 1:00 D
269Rule Brazil 1992 only - Feb 9 0:00 0 S
270Rule Brazil 1993 max - Oct Sun>=11 0:00 1:00 D
271Rule Brazil 1993 only - Jan 31 0:00 0 S
272Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 S
273Rule Brazil 1996 max - Feb Sun>=11 0:00 0 S
274
275# Zone NAME GMTOFF RULES FORMAT [UNTIL]
276#
277# Fernando de Noronha
278Zone America/Noronha -2:09:40 - LMT 1914
279 -2:00 - FST 1963 Dec 9
280 -2:00 Brazil F%sT 1990 Jul
281 -2:00 - FST
282#
283# Amapa, east Para, Maranhao, Piaui, Ceara, Rio Grande do Norte, Paraiba,
284# Pernambuco (except Fernando de Noronha)
285Zone America/Fortaleza -2:34:00 - LMT 1914
286 -3:00 - EST 1963 Dec 9
287 -3:00 Brazil E%sT 1990 Jul
288 -3:00 - EST
289#
290# Alagoas, Sergipe, Tocantins
291Zone America/Maceio -2:22:52 - LMT 1914
292 -3:00 - EST 1963 Dec 9
293 -3:00 Brazil E%sT 1990 Jul
294 -3:00 - EST 1995 Jul
295 -3:00 Brazil E%sT
296#
297# Bahia, Goias, Distrito Federal, Minas Gerais, Espirito Santo, Rio de Janeiro,
298# Sao Paulo, Parana, Santa Catarina, Rio Grande do Sul
299Zone America/Sao_Paulo -3:06:28 - LMT 1914
300 -3:00 Brazil E%sT
301#
302# Mato Grosso, Mato Grosso do Sul
303Zone America/Cuiaba -3:44:20 - LMT 1914
304 -4:00 - WST 1963 Dec 9
305 -4:00 Brazil W%sT
306#
307# Roraima, west Para, Amazonas, Rondonia
308Zone America/Manaus -4:00:04 - LMT 1914
309 -4:00 - WST 1963 Dec 9
310 -4:00 Brazil W%sT 1990 Jul
311 -4:00 - WST
312#
313# Acre
314# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
315Zone America/Porto_Acre -4:31:12 - LMT 1914
316 -5:00 - AST 1963 Dec 9
317 -5:00 Brazil A%sT 1988 Jul
318 -5:00 - AST
319#
320# Martin Vaz and Trinidade are like America/Noronha.
321
322
323# Chile
324
325# From Eduardo Krell (1995-10-19):
326# The law says to switch to DST at midnight [24:00] on the second SATURDAY
327# of October.... The law is the same for March and October.
328
329# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
330Rule Chile 1918 only - Sep 1 0:00 1:00 S
331Rule Chile 1919 only - Jul 2 0:00 0 -
332Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
333Rule Chile 1928 1932 - Apr 1 0:00 0 -
334Rule Chile 1969 max - Oct Sun>=9 0:00 1:00 S
335Rule Chile 1970 max - Mar Sun>=9 0:00 0 -
336# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
337# (1996-09) says 1998-03-08. Ignore these for now.
338# Zone NAME GMTOFF RULES FORMAT [UNTIL]
339Zone America/Santiago -4:42:40 - LMT 1890
340 -4:42:40 - SMT 1910 # Santiago Mean Time
341 -5:00 Chile CL%sT 1932 Sep # Chile Time
342 -4:00 Chile CL%sT
343Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
344 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
345 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
346 -6:00 Chile EAS%sT
347#
348# Whitman says Juan Fernandez Is are like America/Santiago.
349# San Ambrosio, San Felix
350# no information; probably like America/Santiago
351
352
353# Colombia
354# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
355Rule CO 1992 only - May 2 0:00 1:00 S
356Rule CO 1992 only - Dec 31 0:00 0 -
357# Zone NAME GMTOFF RULES FORMAT [UNTIL]
358Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
359 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
360 -5:00 CO CO%sT # Colombia Time
361# Malpelo, Providencia, San Andres
362# no information; probably like America/Bogota
363
364# Curacao
365# Zone NAME GMTOFF RULES FORMAT [UNTIL]
366Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
367 -4:30 - ANT 1965 # Netherlands Antilles Time
368 -4:00 - AST
369
370# Ecuador
371# Zone NAME GMTOFF RULES FORMAT [UNTIL]
372Zone America/Guayaquil -5:19:20 - LMT 1890
373 -5:14:00 - QMT 1931 # Quito Mean Time
374 -5:00 - ECT # Ecuador Time
375Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
376 -5:00 - ECT 1986
377 -6:00 - GALT # Galapagos Time
378
379# Falklands
380# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
381Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
382Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
383Rule Falk 1939 only - Oct 1 0:00 1:00 S
384Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
385Rule Falk 1943 only - Jan 1 0:00 0 -
386Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
387Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
388Rule Falk 1984 only - Sep 16 0:00 1:00 S
389Rule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S
390Rule Falk 1986 max - Apr Sun>=16 0:00 0 -
391Rule Falk 1996 max - Sep Sun>=8 0:00 1:00 S
392# Zone NAME GMTOFF RULES FORMAT [UNTIL]
393Zone Atlantic/Stanley -3:51:24 - LMT 1890
394 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
395 -4:00 Falk FK%sT 1983 May # Falkland Is Time
396 -3:00 Falk FK%sT 1985 Sep 15
397 -4:00 Falk FK%sT
398
399# French Guiana
400# Zone NAME GMTOFF RULES FORMAT [UNTIL]
401Zone America/Cayenne -3:29:20 - LMT 1911 Jul
402 -4:00 - GFT 1967 Oct # French Guiana Time
403 -3:00 - GFT
404
405# Guyana
406# Zone NAME GMTOFF RULES FORMAT [UNTIL]
407Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
408 -3:45 - GBGT 1966 May 26 # Br Guiana Time
409 -3:45 - GYT 1975 Jul 31 # Guyana Time
410 -3:00 - GYT 1991
411# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
412 -4:00 - GYT
413
414# Paraguay
415
416# From Bob Devine (1988-01-28):
417# Paraguay: First day in October to last in March. Midnight switch??
418# Since 1980.
419
420# From U. S. Naval Observatory (1989-01-19):
421# PARAGUAY 4 H BEHIND UTC
422# PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89
423
424# From Shanks (1991):
425# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
426Rule Para 1975 1978 - Oct 1 0:00 1:00 S
427Rule Para 1975 1978 - Mar 1 0:00 0 -
428# Shanks says 1979 was all DST.
429Rule Para 1980 1991 - Apr 1 0:00 0 -
430Rule Para 1980 1988 - Oct 1 0:00 1:00 S
431Rule Para 1989 only - Oct 22 0:00 1:00 S
432Rule Para 1990 only - Oct 1 0:00 1:00 S
433Rule Para 1991 only - Oct 6 0:00 1:00 S
434Rule Para 1992 only - Mar 1 0:00 0 -
435Rule Para 1992 only - Oct 5 0:00 1:00 S
436Rule Para 1993 only - Mar 31 0:00 0 -
437Rule Para 1993 max - Oct 1 0:00 1:00 S
438Rule Para 1994 1995 - Feb lastSun 0:00 0 -
439Rule Para 1996 max - Mar 1 0:00 0 -
440# Zone NAME GMTOFF RULES FORMAT [UNTIL]
441Zone America/Asuncion -3:50:40 - LMT 1890
442 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
443 -4:00 - PYT 1972 Oct # Paraguay Time
444 -3:00 - PYT 1974 Apr
445 -4:00 Para PY%sT
446
447# Peru
448# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
449Rule Peru 1938 only - Jan 1 0:00 1:00 S
450Rule Peru 1938 only - Apr 1 0:00 0 -
451Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
452Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
453Rule Peru 1987 only - Jan 1 0:00 1:00 S
454Rule Peru 1987 only - Apr 1 0:00 0 -
455Rule Peru 1990 only - Jan 1 0:00 1:00 S
456Rule Peru 1990 only - Apr 1 0:00 0 -
457Rule Peru 1993 only - Jan 1 0:00 1:00 S
458Rule Peru 1993 only - Apr 1 0:00 0 -
459# Zone NAME GMTOFF RULES FORMAT [UNTIL]
460Zone America/Lima -5:08:12 - LMT 1890
461 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
462 -5:00 Peru PE%sT # Peru Time
463
464# South Georgia
465# Zone NAME GMTOFF RULES FORMAT [UNTIL]
466Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
467 -2:00 - GST # South Georgia Time
468
469# South Sandwich Is
470# uninhabited
471
472# Suriname
473# Zone NAME GMTOFF RULES FORMAT [UNTIL]
474Zone America/Paramaribo -3:40:40 - LMT 1911
475 -3:40:52 - PMT 1935 # Paramaribo Mean Time
476 -3:40:36 - PMT 1945 Oct # The capital moved?
477 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
478 -3:30 - SRT 1984 Oct # Suriname Time
479 -3:00 - SRT
480
481# Trinidad and Tobago
482# Zone NAME GMTOFF RULES FORMAT [UNTIL]
483Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
484 -4:00 - AST
485
486# Uruguay
487# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
488# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
489# From Shanks (1991):
490# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
491# Whitman gives 1923 Oct 1; go with Shanks.
492Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
493Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
494Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
495Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
496# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
497Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
498Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
499Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
500# Whitman gives 1937 Oct 3; go with Shanks.
501Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
502# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
503# and 1943 Apr 13 ``to present time''; go with Shanks.
504Rule Uruguay 1941 only - Aug 1 0:00 0 -
505Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
506Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
507Rule Uruguay 1943 only - Mar 14 0:00 0 -
508Rule Uruguay 1959 only - May 24 0:00 1:00 S
509Rule Uruguay 1959 only - Nov 15 0:00 0 -
510Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
511Rule Uruguay 1960 only - Mar 6 0:00 0 -
512Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
513Rule Uruguay 1965 only - Sep 26 0:00 0 -
514Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
515Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
516Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
517Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
518Rule Uruguay 1972 only - Aug 15 0:00 0 -
519Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
520Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
521Rule Uruguay 1976 only - Oct 1 0:00 0 -
522Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
523Rule Uruguay 1978 only - Apr 1 0:00 0 -
524Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
525Rule Uruguay 1980 only - May 1 0:00 0 -
526Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
527Rule Uruguay 1988 only - Mar 14 0:00 0 -
528Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
529Rule Uruguay 1989 only - Mar 12 0:00 0 -
530Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
531Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
532Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
533Rule Uruguay 1992 1993 - Oct Sun>=15 0:00 1:00 S
534Rule Uruguay 1993 only - Feb 28 0:00 0 -
535# Zone NAME GMTOFF RULES FORMAT [UNTIL]
536Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
537 -3:44:44 - MMT 1920 May 1 # Montevideo MT
538 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
539 -3:00 Uruguay UY%sT
540
541# Venezuela
542# Zone NAME GMTOFF RULES FORMAT [UNTIL]
543Zone America/Caracas -4:27:44 - LMT 1890
544 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
545 -4:30 - VET 1965 # Venezuela Time
546 -4:00 - VET
103#
104# Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; 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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
114#
115# Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC),
116# Tierra del Fuego (TF) & Antartida e Islas
117Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
118 -4:16:44 - CMT 1920 May # Cordoba Mean Time
119 -4:00 - ART 1930 Dec
120 -4:00 Arg AR%sT 1969 Oct 5
121 -3:00 Arg AR%sT
122#
123# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
124# Formosa (FM), La Pampa (LP), Chubut (CH)
125Zone America/Rosario -4:02:40 - LMT 1894 Nov
126 -4:16:44 - CMT 1920 May
127 -4:00 - ART 1930 Dec
128 -4:00 Arg AR%sT 1969 Oct 5
129 -3:00 Arg AR%sT 1991 Jul
130 -3:00 - ART
131#
132# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL),
133# Neuquen (NQ), Rio Negro (RN)
134Zone America/Cordoba -4:16:44 - LMT 1894 Nov
135 -4:16:44 - CMT 1920 May
136 -4:00 - ART 1930 Dec
137 -4:00 Arg AR%sT 1969 Oct 5
138 -3:00 Arg AR%sT 1990 Jul
139 -3:00 - ART
140#
141# Jujuy (JY)
142Zone America/Jujuy -4:21:12 - LMT 1894 Nov
143 -4:16:44 - CMT 1920 May
144 -4:00 - ART 1930 Dec
145 -4:00 Arg AR%sT 1969 Oct 5
146 -3:00 Arg AR%sT 1991 Mar 3
147 -4:00 - WART 1991 Oct 6
148 -4:00 1:00 WARST 1992 Mar 15
149 -4:00 - WART 1992 Oct 18
150 -3:00 - ART
151#
152# Catamarca (CT)
153Zone America/Catamarca -4:23:08 - 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 1990 Jul
158 -3:00 - ART 1991 Jul
159 -3:00 Arg AR%sT 1992 Jul
160 -3:00 - ART
161#
162# Mendoza (MZ)
163Zone America/Mendoza -4:35:16 - LMT 1894 Nov
164 -4:16:44 - CMT 1920 May
165 -4:00 - ART 1930 Dec
166 -4:00 Arg AR%sT 1969 Oct 5
167 -3:00 Arg AR%sT 1991 Mar 3
168 -4:00 - WART 1991 Oct 15
169 -4:00 1:00 WARST 1992 Mar 1
170 -4:00 - WART 1992 Oct 18
171 -3:00 - ART
172
173# Aruba
174# Zone NAME GMTOFF RULES FORMAT [UNTIL]
175Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
176 -4:30 - ANT 1965 # Netherlands Antilles Time
177 -4:00 - AST
178
179# Bolivia
180# Zone NAME GMTOFF RULES FORMAT [UNTIL]
181Zone America/La_Paz -4:32:36 - LMT 1890
182 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time
183 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
184 -4:00 - BOT # Bolivia Time
185
186# Brazil
187
188# From Guy Harris:
189# The OAG lists 1987-10-25 and 1988-02-12 as the starting and
190# ending dates, giving them as "estimated date(s) based on previous year". We
191# infer a rule here from one example, always a dangerous practice.... Yes,
192# they really do switch on Saturday, according to the OAG.
193# "[America/Porto_Acre]" is for the Territory of Acre;
194# "[America/Noronha]" is for Fernando De Noronha.
195
196# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
197# The mayor of Rio recently attempted to change the time zone rules
198# just in his city, in order to leave more summer time for the tourist trade.
199# The rule change lasted only part of the day;
200# the federal government refused to follow the city's rules, and business
201# was in a chaos, so the mayor backed down that afternoon.
202
203# From IATA SSIM (1996-02):
204# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
205# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
206# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
207# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
208# [The last three states are new to this issue of the IATA SSIM.]
209
210# From Gwillim Law (1996-10-07):
211# Geography, history (Tocantins was part of Goias until 1989), and other
212# sources of time zone information lead me to believe that AL, SE, and TO were
213# always in BR1, and so the only change was whether or not they observed DST....
214# The earliest issue of the SSIM I have is 2/91. Each issue from then until
215# 9/95 says that DST is observed only in the ten states I quoted from 9/95,
216# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
217# (UTC-4).... The other two time zones given for Brazil are BR3, which is
218# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
219# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
220# become part of the state of Pernambuco). The boundary between BR1 and BR2
221# has never been clearly stated. They've simply been called East and West.
222# However, some conclusions can be drawn from another IATA manual: the Airline
223# Coding Directory, which lists close to 400 airports in Brazil. For each
224# airport it gives a time zone which is coded to the SSIM. From that
225# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
226# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
227# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
228
229# From Paul Eggert (1996-11-22):
230# Let's make the following assumptions:
231#
232# * All data in Shanks are correct through 1990. In particular,
233# Shanks was right when he said Acre stopped observing DST in mid-1988.
234# * Areas where Shanks reports DST up to 1990, but the IATA reports no DST
235# in 1995, stopped observing DST in mid-1990.
236#
237# Under these assumptions Brazil needs 7 entries to cover all the distinct
238# time zone histories since 1970:
239#
240# Noronha (UTC-2), Fortaleza (UTC-3), and Manaus (UTC-4) stopped observing DST
241# in mid-1990.
242# Maceio (UTC-3) stopped observing DST in mid-1990, but started again mid-1995.
243# Sao Paulo (UTC-3) and Cuiaba (UTC-4) always observed DST.
244# Porto Acre (UTC-5) stopped observing DST in mid-1988.
245
246# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
247Rule Brazil 1931 only - Oct 3 11:00 1:00 D
248Rule Brazil 1932 1933 - Apr 1 0:00 0 S
249Rule Brazil 1932 only - Oct 3 0:00 1:00 D
250Rule Brazil 1949 1952 - Dec 1 0:00 1:00 D
251Rule Brazil 1950 only - Apr 16 0:00 0 S
252Rule Brazil 1951 1953 - Apr 1 0:00 0 S
253Rule Brazil 1963 only - Dec 9 0:00 1:00 D
254Rule Brazil 1964 only - Mar 1 0:00 0 S
255Rule Brazil 1965 only - Jan 31 0:00 1:00 D
256Rule Brazil 1965 only - Apr 1 0:00 0 S
257Rule Brazil 1965 only - Dec 1 0:00 1:00 D
258Rule Brazil 1966 1968 - Mar 1 0:00 0 S
259Rule Brazil 1966 1967 - Nov 1 0:00 1:00 D
260Rule Brazil 1985 only - Nov 2 0:00 1:00 D
261Rule Brazil 1986 only - Mar 15 0:00 0 S
262Rule Brazil 1986 1987 - Oct Sat<=28 0:00 1:00 D
263Rule Brazil 1987 only - Feb 14 0:00 0 S
264Rule Brazil 1988 only - Feb 7 0:00 0 S
265Rule Brazil 1989 only - Jan 22 0:00 0 S
266Rule Brazil 1988 1989 - Oct Sun>=10 0:00 1:00 D
267Rule Brazil 1990 1991 - Feb Sun>=11 0:00 0 S
268Rule Brazil 1990 1992 - Oct Sun>=20 0:00 1:00 D
269Rule Brazil 1992 only - Feb 9 0:00 0 S
270Rule Brazil 1993 max - Oct Sun>=11 0:00 1:00 D
271Rule Brazil 1993 only - Jan 31 0:00 0 S
272Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 S
273Rule Brazil 1996 max - Feb Sun>=11 0:00 0 S
274
275# Zone NAME GMTOFF RULES FORMAT [UNTIL]
276#
277# Fernando de Noronha
278Zone America/Noronha -2:09:40 - LMT 1914
279 -2:00 - FST 1963 Dec 9
280 -2:00 Brazil F%sT 1990 Jul
281 -2:00 - FST
282#
283# Amapa, east Para, Maranhao, Piaui, Ceara, Rio Grande do Norte, Paraiba,
284# Pernambuco (except Fernando de Noronha)
285Zone America/Fortaleza -2:34:00 - LMT 1914
286 -3:00 - EST 1963 Dec 9
287 -3:00 Brazil E%sT 1990 Jul
288 -3:00 - EST
289#
290# Alagoas, Sergipe, Tocantins
291Zone America/Maceio -2:22:52 - LMT 1914
292 -3:00 - EST 1963 Dec 9
293 -3:00 Brazil E%sT 1990 Jul
294 -3:00 - EST 1995 Jul
295 -3:00 Brazil E%sT
296#
297# Bahia, Goias, Distrito Federal, Minas Gerais, Espirito Santo, Rio de Janeiro,
298# Sao Paulo, Parana, Santa Catarina, Rio Grande do Sul
299Zone America/Sao_Paulo -3:06:28 - LMT 1914
300 -3:00 Brazil E%sT
301#
302# Mato Grosso, Mato Grosso do Sul
303Zone America/Cuiaba -3:44:20 - LMT 1914
304 -4:00 - WST 1963 Dec 9
305 -4:00 Brazil W%sT
306#
307# Roraima, west Para, Amazonas, Rondonia
308Zone America/Manaus -4:00:04 - LMT 1914
309 -4:00 - WST 1963 Dec 9
310 -4:00 Brazil W%sT 1990 Jul
311 -4:00 - WST
312#
313# Acre
314# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
315Zone America/Porto_Acre -4:31:12 - LMT 1914
316 -5:00 - AST 1963 Dec 9
317 -5:00 Brazil A%sT 1988 Jul
318 -5:00 - AST
319#
320# Martin Vaz and Trinidade are like America/Noronha.
321
322
323# Chile
324
325# From Eduardo Krell (1995-10-19):
326# The law says to switch to DST at midnight [24:00] on the second SATURDAY
327# of October.... The law is the same for March and October.
328
329# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
330Rule Chile 1918 only - Sep 1 0:00 1:00 S
331Rule Chile 1919 only - Jul 2 0:00 0 -
332Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
333Rule Chile 1928 1932 - Apr 1 0:00 0 -
334Rule Chile 1969 max - Oct Sun>=9 0:00 1:00 S
335Rule Chile 1970 max - Mar Sun>=9 0:00 0 -
336# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
337# (1996-09) says 1998-03-08. Ignore these for now.
338# Zone NAME GMTOFF RULES FORMAT [UNTIL]
339Zone America/Santiago -4:42:40 - LMT 1890
340 -4:42:40 - SMT 1910 # Santiago Mean Time
341 -5:00 Chile CL%sT 1932 Sep # Chile Time
342 -4:00 Chile CL%sT
343Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
344 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
345 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
346 -6:00 Chile EAS%sT
347#
348# Whitman says Juan Fernandez Is are like America/Santiago.
349# San Ambrosio, San Felix
350# no information; probably like America/Santiago
351
352
353# Colombia
354# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
355Rule CO 1992 only - May 2 0:00 1:00 S
356Rule CO 1992 only - Dec 31 0:00 0 -
357# Zone NAME GMTOFF RULES FORMAT [UNTIL]
358Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
359 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
360 -5:00 CO CO%sT # Colombia Time
361# Malpelo, Providencia, San Andres
362# no information; probably like America/Bogota
363
364# Curacao
365# Zone NAME GMTOFF RULES FORMAT [UNTIL]
366Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
367 -4:30 - ANT 1965 # Netherlands Antilles Time
368 -4:00 - AST
369
370# Ecuador
371# Zone NAME GMTOFF RULES FORMAT [UNTIL]
372Zone America/Guayaquil -5:19:20 - LMT 1890
373 -5:14:00 - QMT 1931 # Quito Mean Time
374 -5:00 - ECT # Ecuador Time
375Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
376 -5:00 - ECT 1986
377 -6:00 - GALT # Galapagos Time
378
379# Falklands
380# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
381Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
382Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
383Rule Falk 1939 only - Oct 1 0:00 1:00 S
384Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
385Rule Falk 1943 only - Jan 1 0:00 0 -
386Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
387Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
388Rule Falk 1984 only - Sep 16 0:00 1:00 S
389Rule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S
390Rule Falk 1986 max - Apr Sun>=16 0:00 0 -
391Rule Falk 1996 max - Sep Sun>=8 0:00 1:00 S
392# Zone NAME GMTOFF RULES FORMAT [UNTIL]
393Zone Atlantic/Stanley -3:51:24 - LMT 1890
394 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
395 -4:00 Falk FK%sT 1983 May # Falkland Is Time
396 -3:00 Falk FK%sT 1985 Sep 15
397 -4:00 Falk FK%sT
398
399# French Guiana
400# Zone NAME GMTOFF RULES FORMAT [UNTIL]
401Zone America/Cayenne -3:29:20 - LMT 1911 Jul
402 -4:00 - GFT 1967 Oct # French Guiana Time
403 -3:00 - GFT
404
405# Guyana
406# Zone NAME GMTOFF RULES FORMAT [UNTIL]
407Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
408 -3:45 - GBGT 1966 May 26 # Br Guiana Time
409 -3:45 - GYT 1975 Jul 31 # Guyana Time
410 -3:00 - GYT 1991
411# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
412 -4:00 - GYT
413
414# Paraguay
415
416# From Bob Devine (1988-01-28):
417# Paraguay: First day in October to last in March. Midnight switch??
418# Since 1980.
419
420# From U. S. Naval Observatory (1989-01-19):
421# PARAGUAY 4 H BEHIND UTC
422# PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89
423
424# From Shanks (1991):
425# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
426Rule Para 1975 1978 - Oct 1 0:00 1:00 S
427Rule Para 1975 1978 - Mar 1 0:00 0 -
428# Shanks says 1979 was all DST.
429Rule Para 1980 1991 - Apr 1 0:00 0 -
430Rule Para 1980 1988 - Oct 1 0:00 1:00 S
431Rule Para 1989 only - Oct 22 0:00 1:00 S
432Rule Para 1990 only - Oct 1 0:00 1:00 S
433Rule Para 1991 only - Oct 6 0:00 1:00 S
434Rule Para 1992 only - Mar 1 0:00 0 -
435Rule Para 1992 only - Oct 5 0:00 1:00 S
436Rule Para 1993 only - Mar 31 0:00 0 -
437Rule Para 1993 max - Oct 1 0:00 1:00 S
438Rule Para 1994 1995 - Feb lastSun 0:00 0 -
439Rule Para 1996 max - Mar 1 0:00 0 -
440# Zone NAME GMTOFF RULES FORMAT [UNTIL]
441Zone America/Asuncion -3:50:40 - LMT 1890
442 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
443 -4:00 - PYT 1972 Oct # Paraguay Time
444 -3:00 - PYT 1974 Apr
445 -4:00 Para PY%sT
446
447# Peru
448# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
449Rule Peru 1938 only - Jan 1 0:00 1:00 S
450Rule Peru 1938 only - Apr 1 0:00 0 -
451Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
452Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
453Rule Peru 1987 only - Jan 1 0:00 1:00 S
454Rule Peru 1987 only - Apr 1 0:00 0 -
455Rule Peru 1990 only - Jan 1 0:00 1:00 S
456Rule Peru 1990 only - Apr 1 0:00 0 -
457Rule Peru 1993 only - Jan 1 0:00 1:00 S
458Rule Peru 1993 only - Apr 1 0:00 0 -
459# Zone NAME GMTOFF RULES FORMAT [UNTIL]
460Zone America/Lima -5:08:12 - LMT 1890
461 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
462 -5:00 Peru PE%sT # Peru Time
463
464# South Georgia
465# Zone NAME GMTOFF RULES FORMAT [UNTIL]
466Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
467 -2:00 - GST # South Georgia Time
468
469# South Sandwich Is
470# uninhabited
471
472# Suriname
473# Zone NAME GMTOFF RULES FORMAT [UNTIL]
474Zone America/Paramaribo -3:40:40 - LMT 1911
475 -3:40:52 - PMT 1935 # Paramaribo Mean Time
476 -3:40:36 - PMT 1945 Oct # The capital moved?
477 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
478 -3:30 - SRT 1984 Oct # Suriname Time
479 -3:00 - SRT
480
481# Trinidad and Tobago
482# Zone NAME GMTOFF RULES FORMAT [UNTIL]
483Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
484 -4:00 - AST
485
486# Uruguay
487# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
488# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
489# From Shanks (1991):
490# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
491# Whitman gives 1923 Oct 1; go with Shanks.
492Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
493Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
494Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
495Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
496# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
497Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
498Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
499Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
500# Whitman gives 1937 Oct 3; go with Shanks.
501Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
502# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
503# and 1943 Apr 13 ``to present time''; go with Shanks.
504Rule Uruguay 1941 only - Aug 1 0:00 0 -
505Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
506Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
507Rule Uruguay 1943 only - Mar 14 0:00 0 -
508Rule Uruguay 1959 only - May 24 0:00 1:00 S
509Rule Uruguay 1959 only - Nov 15 0:00 0 -
510Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
511Rule Uruguay 1960 only - Mar 6 0:00 0 -
512Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
513Rule Uruguay 1965 only - Sep 26 0:00 0 -
514Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
515Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
516Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
517Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
518Rule Uruguay 1972 only - Aug 15 0:00 0 -
519Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
520Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
521Rule Uruguay 1976 only - Oct 1 0:00 0 -
522Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
523Rule Uruguay 1978 only - Apr 1 0:00 0 -
524Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
525Rule Uruguay 1980 only - May 1 0:00 0 -
526Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
527Rule Uruguay 1988 only - Mar 14 0:00 0 -
528Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
529Rule Uruguay 1989 only - Mar 12 0:00 0 -
530Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
531Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
532Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
533Rule Uruguay 1992 1993 - Oct Sun>=15 0:00 1:00 S
534Rule Uruguay 1993 only - Feb 28 0:00 0 -
535# Zone NAME GMTOFF RULES FORMAT [UNTIL]
536Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
537 -3:44:44 - MMT 1920 May 1 # Montevideo MT
538 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
539 -3:00 Uruguay UY%sT
540
541# Venezuela
542# Zone NAME GMTOFF RULES FORMAT [UNTIL]
543Zone America/Caracas -4:27:44 - LMT 1890
544 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
545 -4:30 - VET 1965 # Venezuela Time
546 -4:00 - VET