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1 # @(#)southamerica 7.13
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).
7 # From Paul Eggert <eggert@twinsun.com> (1996-09-03):
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 # Except where otherwise noted, it is the source for the data below.
12 #
13 # The following abbreviations are used in this file.
14 # Corrections are welcome!
15 # std dst
16 # LMT Local Mean Time
17 # -2:00 FST FDT Fernando de Noronha
18 # -3:00 EST EDT Eastern Brazil
19 # -4:00 WST WDT Western Brazil
20 # -4:00 AST ADT Atlantic
21 # -5:00 AST ADT Acre
22 #
23 # See the `africa' file for time zone naming and abbreviation conventions.
24 # Earlier editions of these tables used the North American style (e.g. ARST and
25 # ARDT for Argentine Standard and Daylight Time), but the following quote
26 # suggests that it's better to use European style (e.g. ART and ARST).
27 # I suggest the use of _Summer time_ instead of the more cumbersome
28 # _daylight-saving time_. _Summer time_ seems to be in general use
29 # in Europe and South America.
30 # -- E O Cutler, _New York Times_ (1937-02-14), quoted in
31 # H L Mencken, _The American Language: Supplement I_ (1960), p 466
34 # From Guy Harris:
35 # From Official Airline Guide - Worldwide Edition (1987). Countries not
36 # listed here do not observe DST, according to the OAG. Time zone names
37 # are pure inventions, and none are supplied for countries not observing
38 # DST; updates from natives would be appreciated. The times that DST
39 # starts and ends are based on the assumption that they switch a 2AM just
40 # as everybody else does.
42 ###############################################################################
44 ###############################################################################
46 # Argentina
48 # From Bob Devine (January 28, 1988):
49 # Argentina: first Sunday in October to first Sunday in April since 1976.
50 # Double Summer time from 1969 to 1974. Switches at midnight.
52 # From U. S. Naval Observatory (January 19, 19889):
53 # ARGENTINA 3 H BEHIND UTC
55 # From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
56 # I am sending modifications to the Argentinian time zone table...
57 # AR was chosen because they are the ISO letters that represent Argentina.
59 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
60 Rule Arg 1930 only - Dec 1 0:00 1:00 S
61 Rule Arg 1931 only - Apr 1 0:00 0 -
62 Rule Arg 1931 only - Oct 15 0:00 1:00 S
63 Rule Arg 1932 1940 - Mar 1 0:00 0 -
64 Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
65 Rule Arg 1940 only - Jul 1 0:00 1:00 S
66 Rule Arg 1941 only - Jun 15 0:00 0 -
67 Rule Arg 1941 only - Oct 15 0:00 1:00 S
68 Rule Arg 1943 only - Aug 1 0:00 0 -
69 Rule Arg 1943 only - Oct 15 0:00 1:00 S
70 Rule Arg 1946 only - Mar 1 0:00 0 -
71 Rule Arg 1946 only - Oct 1 0:00 1:00 S
72 Rule Arg 1963 only - Oct 1 0:00 0 -
73 Rule Arg 1963 only - Dec 15 0:00 1:00 S
74 Rule Arg 1964 1966 - Mar 1 0:00 0 -
75 Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
76 Rule Arg 1967 only - Apr 1 0:00 0 -
77 Rule Arg 1967 1968 - Oct Sun<=7 0:00 1:00 S
78 Rule Arg 1968 1969 - Apr Sun<=7 0:00 0 -
79 Rule Arg 1974 only - Jan 23 0:00 1:00 S
80 Rule Arg 1974 only - May 1 0:00 0 -
81 Rule Arg 1974 1976 - Oct Sun<=7 0:00 1:00 S
82 Rule Arg 1975 1977 - Apr Sun<=7 0:00 0 -
83 Rule Arg 1985 only - Nov 2 0:00 1:00 S
84 Rule Arg 1986 only - Mar 14 0:00 0 -
85 Rule Arg 1986 1987 - Oct 25 0:00 1:00 S
86 Rule Arg 1987 only - Feb 13 0:00 0 -
87 Rule Arg 1988 only - Feb 7 0:00 0 -
88 Rule Arg 1988 only - Dec 1 0:00 1:00 S
89 #
90 # From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
91 # These corrections were contributed by InterSoft Argentina S.A.,
92 # obtaining the data from the:
93 # Talleres de Hidrografia Naval Argentina
94 # (Argentinian Naval Hydrography Institute)
95 #
96 # Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; go with Otero.
97 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
98 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
99 #
100 # From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
101 # From this moment on, the law that mandated the daylight saving
102 # time corrections was derogated and no more modifications
103 # to the time zones (for daylight saving) are now made.
104 #
105 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
106 Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
107 -4:16:44 - CMT 1920 May # Cordoba Mean Time
108 -4:00 - ART 1930 Dec
109 -4:00 Arg AR%sT 1969 Oct 5
110 -3:00 Arg AR%sT
112 # Aruba
113 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
114 Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
115 -4:30 - ANT 1965 # Netherlands Antilles Time
116 -4:00 - AST
118 # Bolivia
119 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
120 Zone America/La_Paz -4:32:36 - LMT 1890
121 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time
122 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
123 -4:00 - BOT # Bolivia Time
125 # Brazil
127 # From Guy Harris:
128 # The OAG lists October 25, 1987 and February 12, 1988 as the starting and
129 # ending dates, giving them as "estimated date(s) based on previous year". We
130 # infer a rule here from one example, always a dangerous practice.... Yes,
131 # they really do switch on Saturday, according to the OAG.
132 # "[America/Porto_Acre]" is for the Territory of Acre;
133 # "[America/Noronha]" is for Fernando De Noronha.
135 # From Bob Devine (January 28, 1988):
136 # The only information I found is that there was no DST up to 1985.
137 # But there was some before 1952!
139 # From U. S. Naval Observatory (January 16, 1989):
140 # BRAZIL WEST 5 H BEHIND UTC TERRITORY OF ACRE
141 # BRAZIL WEST 4 H BEHIND UTC ACRE OCT 23, '88-FEB 11,
142 # BRAZIL '89 (ESTIMATED)
143 # BRAZIL CENTRAL 4 H BEHIND UTC MANAUS
144 # BRAZIL CENTRAL 3 H BEHIND UTC MANAUS OCT 23, '88-FEB 11,
145 # BRAZIL CENTRAL '89 (ESTIMATED)
146 # BRAZIL EAST 3 H BEHIND UTC COASTAL STATES, RIO, SAO
147 # BRAZIL EAST PAULO, BRASILIA
148 # BRAZIL EAST 2 H BEHIND UTC COASTAL STATES, RIO, SAO
149 # BRAZIL PAULO, BRASILIA OCT 23,
150 # BRAZIL '88-FEB 11, '89
151 # BRAZIL (ESTIMATED)
152 # BRAZIL 2 H BEHIND UTC ATLANTIC ISLANDS, FERNANDO
153 # BRAZIL DE NORONHA
154 # BRAZIL 1 H BEHIND UTC OCT 23, '88-FEB 11, '89
155 # BRAZIL (ESTIMATED)
156 # BRAZIL 3 H BEHIND UTC FOR MOST MAJOR AIRPORTS.
158 # From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
159 # The mayor of Rio recently attempted to change the time zone rules
160 # just in his city, in order to leave more summer time for the tourist trade.
161 # The rule change lasted only part of the day;
162 # the federal government refused to follow the city's rules, and business
163 # was in a chaos, so the mayor backed down that afternoon.
164 # Shanks claims Acre stopped observing DST after 1988 Feb 7, but it
165 # could just be that his table ran out of room. We're extrapolating
166 # about time zone changes after 1990 Feb 11.
168 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
169 Rule Brazil 1931 only - Oct 3 11:00 1:00 D
170 Rule Brazil 1932 1933 - Apr 1 0:00 0 S
171 Rule Brazil 1932 only - Oct 3 0:00 1:00 D
172 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 D
173 Rule Brazil 1950 only - Apr 16 0:00 0 S
174 Rule Brazil 1951 1953 - Apr 1 0:00 0 S
175 Rule Brazil 1963 only - Dec 9 0:00 1:00 D
176 Rule Brazil 1964 only - Mar 1 0:00 0 S
177 Rule Brazil 1965 only - Jan 31 0:00 1:00 D
178 Rule Brazil 1965 only - Apr 1 0:00 0 S
179 Rule Brazil 1965 only - Dec 1 0:00 1:00 D
180 Rule Brazil 1966 1968 - Mar 1 0:00 0 S
181 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 D
182 Rule Brazil 1985 only - Nov 2 0:00 1:00 D
183 Rule Brazil 1986 only - Mar 15 0:00 0 S
184 Rule Brazil 1986 1987 - Oct Sat<=28 0:00 1:00 D
185 Rule Brazil 1987 only - Feb 14 0:00 0 S
186 Rule Brazil 1988 only - Feb 7 0:00 0 S
187 Rule Brazil 1989 only - Jan 22 0:00 0 S
188 Rule Brazil 1988 max - Oct Sun>=15 0:00 1:00 D
189 Rule Brazil 1990 max - Feb Sun>=8 0:00 0 S
190 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
191 Zone America/Noronha -2:09:40 - LMT 1914
192 -2:00 - FST 1963 Dec 9
193 -2:00 Brazil F%sT
194 Zone America/Sao_Paulo -3:06:28 - LMT 1914
195 -3:00 Brazil E%sT
196 Zone America/Manaus -4:00:04 - LMT 1914
197 -4:00 - WST 1963 Dec 9
198 -4:00 Brazil W%sT
199 # Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
200 Zone America/Porto_Acre -4:31:12 - LMT 1914
201 -5:00 - AST 1963 Dec 9
202 -5:00 Brazil A%sT
203 #
204 # Martin Vaz and Trinidade are like America/Noronha.
207 # Chile
209 # From Eduardo Krell (1995-10-19):
210 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
211 # of October.... The law is the same for March and October.
213 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
214 Rule Chile 1918 only - Sep 1 0:00 1:00 S
215 Rule Chile 1919 only - Jul 2 0:00 0 -
216 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
217 Rule Chile 1928 1932 - Apr 1 0:00 0 -
218 Rule Chile 1969 max - Oct Sun>=9 0:00 1:00 S
219 Rule Chile 1970 max - Mar Sun>=9 0:00 0 -
220 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
221 Zone America/Santiago -4:42:40 - LMT 1890
222 -4:42:40 - SMT 1910 # Santiago Mean Time
223 -5:00 Chile CL%sT 1932 Sep # Chile Time
224 -4:00 Chile CL%sT
225 Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
226 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
227 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
228 -6:00 Chile EAS%sT
229 #
230 # Whitman says Juan Fernandez Is are like America/Santiago.
231 # San Ambrosio, San Felix
232 # no information; probably like America/Santiago
235 # Colombia
236 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
237 Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
238 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
239 -5:00 - COT # Colombia Time
240 # Malpelo, Providencia, San Andres
241 # no information; probably like America/Bogota
243 # Curacao
244 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
245 Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
246 -4:30 - ANT 1965 # Netherlands Antilles Time
247 -4:00 - AST
249 # Ecuador
250 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
251 Zone America/Guayaquil -5:19:20 - LMT 1890
252 -5:14:00 - QMT 1931 # Quito Mean Time
253 -5:00 - ECT # Ecuador Time
254 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
255 -5:00 - ECT 1986
256 -6:00 - GALT # Galapagos Time
258 # Falklands
259 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
260 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
261 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
262 Rule Falk 1939 only - Oct 1 0:00 1:00 S
263 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
264 Rule Falk 1943 only - Jan 1 0:00 0 -
265 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
266 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
267 Rule Falk 1984 only - Sep 16 0:00 1:00 S
268 Rule Falk 1985 max - Sep Sun>=9 0:00 1:00 S
269 Rule Falk 1986 max - Apr Sun>=16 0:00 0 -
270 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
271 Zone Atlantic/Stanley -3:51:24 - LMT 1890
272 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
273 -4:00 Falk FK%sT 1983 May # Falkland Is Time
274 -3:00 Falk FK%sT 1985 Sep 15
275 -4:00 Falk FK%sT
277 # French Guiana
278 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
279 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
280 -4:00 - GFT 1967 Oct # French Guiana Time
281 -3:00 - GFT
283 # Guyana
284 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
285 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
286 -3:45 - GBGT 1966 May 26 # Br Guiana Time
287 -3:45 - GYT 1975 Jul 31 # Guyana Time
288 -3:00 - GYT
291 # Paraguay
293 # From Bob Devine (January 28, 1988):
294 # Paraguay: First day in October to last in March. Midnight switch??
295 # Since 1980.
297 # From U. S. Naval Observatory (January 19, 1989):
298 # PARAGUAY 4 H BEHIND UTC
299 # PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89
301 # From Shanks (1991):
302 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
303 Rule Para 1975 1978 - Oct 1 0:00 1:00 S
304 Rule Para 1975 1978 - Mar 1 0:00 0 -
305 # Shanks says 1979 was all DST.
306 Rule Para 1980 max - Apr 1 0:00 0 -
307 Rule Para 1980 1988 - Oct 1 0:00 1:00 S
308 Rule Para 1989 only - Oct 22 0:00 1:00 S
309 Rule Para 1990 max - Oct 1 0:00 1:00 S
310 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
311 Zone America/Asuncion -3:50:40 - LMT 1890
312 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
313 -4:00 - PYT 1972 Oct # Paraguay Time
314 -3:00 - PYT 1974 Apr
315 -4:00 Para PY%sT
317 # Peru
318 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
319 Rule Peru 1938 only - Jan 1 0:00 1:00 S
320 Rule Peru 1938 only - Apr 1 0:00 0 -
321 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
322 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
323 Rule Peru 1987 only - Jan 1 0:00 1:00 S
324 Rule Peru 1987 only - Apr 1 0:00 0 -
325 Rule Peru 1990 only - Jan 1 0:00 1:00 S
326 Rule Peru 1990 only - Apr 1 0:00 0 -
327 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
328 Zone America/Lima -5:08:12 - LMT 1890
329 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
330 -5:00 Peru PE%sT # Peru Time
332 # South Georgia
333 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
334 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
335 -2:00 - GST # South Georgia Time
337 # South Sandwich Is
338 # uninhabited
340 # Suriname
341 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
342 Zone America/Paramaribo -3:40:40 - LMT 1911
343 -3:40:52 - PMT 1935 # Paramaribo Mean Time
344 -3:40:36 - PMT 1945 Oct # The capital moved?
345 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
346 -3:30 - SRT 1984 Oct # Suriname Time
347 -3:00 - SRT
349 # Trinidad and Tobago
350 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
351 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
352 -4:00 - AST
354 # Uruguay
355 # From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
356 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
357 # From Shanks (1991):
358 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
359 # Whitman gives 1923 Oct 1; go with Shanks.
360 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
361 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
362 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
363 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
364 # Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
365 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
366 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
367 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
368 # Whitman gives 1937 Oct 3; go with Shanks.
369 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
370 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
371 # and 1943 Apr 13 ``to present time''; go with Shanks.
372 Rule Uruguay 1941 only - Aug 1 0:00 0 -
373 Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
374 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
375 Rule Uruguay 1943 only - Mar 14 0:00 0 -
376 Rule Uruguay 1959 only - May 24 0:00 1:00 S
377 Rule Uruguay 1959 only - Nov 15 0:00 0 -
378 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
379 Rule Uruguay 1960 only - Mar 6 0:00 0 -
380 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
381 Rule Uruguay 1965 only - Sep 26 0:00 0 -
382 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
383 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
384 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
385 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
386 Rule Uruguay 1972 only - Aug 15 0:00 0 -
387 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
388 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
389 Rule Uruguay 1976 only - Oct 1 0:00 0 -
390 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
391 Rule Uruguay 1978 only - Apr 1 0:00 0 -
392 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
393 Rule Uruguay 1980 only - May 1 0:00 0 -
394 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
395 Rule Uruguay 1988 only - Mar 14 0:00 0 -
396 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
397 Rule Uruguay 1989 only - Mar 12 0:00 0 -
398 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
399 Rule Uruguay 1990 only - Mar 4 0:00 0 -
400 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
401 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
402 -3:44:44 - MMT 1920 May 1 # Montevideo MT
403 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
404 -3:00 Uruguay UY%sT
406 # Venezuela
407 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
408 Zone America/Caracas -4:27:44 - LMT 1890
409 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
410 -4:30 - VET 1965 # Venezuela Time
411 -4:00 - VET