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1 # @(#)southamerica 7.11
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> (November 18, 1993):
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 # I invented the abbreviations marked `*' in the following table;
14 # the rest are from earlier versions of this file, or from other sources.
15 # Some of these are just plausible excuses for common English abbreviations.
16 # Corrections are welcome!
17 # std dst
18 # LMT Local Mean Time
19 # -2:00 FST FDT Fernando de Noronha
20 # -3:00 EST EDT Eastern South America (conflicts with -5:00)
21 # -3:00 ARST ARDT Argentina
22 # -4:00 AST ADT Andes*, Antilles*, Asuncion*, Atlantic
23 # -4:00 CST CDT Chile (conflicts with -6:00)
24 # -4:00 WST WDT Western Brazil
25 # -5:00 AST ADT Acre (conflicts with -4:00)
26 # -5:00 EST EDT Eastern, Ecuador*
27 # -6:00 CST CDT Archipelago of Columbus*, Central
28 # -7:00 MST MDT Mataveri*, Mountain
29 #
30 # See the `africa' file for Zone naming conventions.
32 # From Guy Harris:
33 # From Official Airline Guide - Worldwide Edition (1987). Countries not
34 # listed here do not observe DST, according to the OAG. Time zone names
35 # are pure inventions, and none are supplied for countries not observing
36 # DST; updates from natives would be appreciated. The times that DST
37 # starts and ends are based on the assumption that they switch a 2AM just
38 # as everybody else does.
40 ###############################################################################
42 ###############################################################################
44 # Argentina
46 # From Bob Devine (January 28, 1988):
47 # Argentina: first Sunday in October to first Sunday in April since 1976.
48 # Double Summer time from 1969 to 1974. Switches at midnight.
50 # From U. S. Naval Observatory (January 19, 19889):
51 # ARGENTINA 3 H BEHIND UTC
53 # From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
54 # I am sending modifications to the Argentinian time zone table...
55 # AR was chosen because they are the ISO letters that represent Argentina.
57 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
58 Rule Arg 1930 only - Dec 1 0:00 1:00 D
59 Rule Arg 1931 only - Apr 1 0:00 0 S
60 Rule Arg 1931 only - Oct 15 0:00 1:00 D
61 Rule Arg 1932 1940 - Mar 1 0:00 0 S
62 Rule Arg 1932 1939 - Nov 1 0:00 1:00 D
63 Rule Arg 1940 only - Jul 1 0:00 1:00 D
64 Rule Arg 1941 only - Jun 15 0:00 0 S
65 Rule Arg 1941 only - Oct 15 0:00 1:00 D
66 Rule Arg 1943 only - Aug 1 0:00 0 S
67 Rule Arg 1943 only - Oct 15 0:00 1:00 D
68 Rule Arg 1946 only - Mar 1 0:00 0 S
69 Rule Arg 1946 only - Oct 1 0:00 1:00 D
70 Rule Arg 1963 only - Oct 1 0:00 0 S
71 Rule Arg 1963 only - Dec 15 0:00 1:00 D
72 Rule Arg 1964 1966 - Mar 1 0:00 0 S
73 Rule Arg 1964 1966 - Oct 15 0:00 1:00 D
74 Rule Arg 1967 only - Apr 1 0:00 0 S
75 Rule Arg 1967 1968 - Oct Sun<=7 0:00 1:00 D
76 Rule Arg 1968 1969 - Apr Sun<=7 0:00 0 S
77 Rule Arg 1974 only - Jan 23 0:00 1:00 D
78 Rule Arg 1974 only - May 1 0:00 0 S
79 Rule Arg 1974 1976 - Oct Sun<=7 0:00 1:00 D
80 Rule Arg 1975 1977 - Apr Sun<=7 0:00 0 S
81 Rule Arg 1985 only - Nov 2 0:00 1:00 D
82 Rule Arg 1986 only - Mar 14 0:00 0 S
83 Rule Arg 1986 1987 - Oct 25 0:00 1:00 D
84 Rule Arg 1987 only - Feb 13 0:00 0 S
85 Rule Arg 1988 only - Feb 7 0:00 0 S
86 Rule Arg 1988 only - Dec 1 0:00 1:00 D
87 #
88 # From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
89 # These corrections were contributed by InterSoft Argentina S.A.,
90 # obtaining the data from the:
91 # Talleres de Hidrografia Naval Argentina
92 # (Argentinian Naval Hydrography Institute)
93 #
94 # Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; go with Otero.
95 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 S
96 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 D
97 #
98 # From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
99 # From this moment on, the law that mandated the daylight saving
100 # time corrections was derogated and no more modifications
101 # to the time zones (for daylight saving) are now made.
102 #
103 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
104 Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
105 -4:17 - CMT 1920 May # Cordoba Mean Time
106 -4:00 - AST 1930 Dec
107 -4:00 Arg A%sT 1969 Oct 5
108 -3:00 Arg AR%sT
110 # Aruba
111 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
112 Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
113 -4:30 - NAST 1965 # Netherlands Antilles
114 -4:00 - AST
116 # Bolivia
117 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
118 Zone America/La_Paz -4:32:36 - LMT 1890
119 -4:33 - LPMT 1931 Oct 15 # La Paz Mean Time
120 -4:33 1:00 LPDT 1932 Mar 21
121 -4:00 - AST
123 # Brazil
125 # From Guy Harris:
126 # The OAG lists October 25, 1987 and February 12, 1988 as the starting and
127 # ending dates, giving them as "estimated date(s) based on previous year". We
128 # infer a rule here from one example, always a dangerous practice.... Yes,
129 # they really do switch on Saturday, according to the OAG.
130 # "[America/Porto_Acre]" is for the Territory of Acre;
131 # "[America/Noronha]" is for Fernando De Noronha.
133 # From Bob Devine (January 28, 1988):
134 # The only information I found is that there was no DST up to 1985.
135 # But there was some before 1952!
137 # From U. S. Naval Observatory (January 16, 1989):
138 # BRAZIL WEST 5 H BEHIND UTC TERRITORY OF ACRE
139 # BRAZIL WEST 4 H BEHIND UTC ACRE OCT 23, '88-FEB 11,
140 # BRAZIL '89 (ESTIMATED)
141 # BRAZIL CENTRAL 4 H BEHIND UTC MANAUS
142 # BRAZIL CENTRAL 3 H BEHIND UTC MANAUS OCT 23, '88-FEB 11,
143 # BRAZIL CENTRAL '89 (ESTIMATED)
144 # BRAZIL EAST 3 H BEHIND UTC COASTAL STATES, RIO, SAO
145 # BRAZIL EAST PAULO, BRASILIA
146 # BRAZIL EAST 2 H BEHIND UTC COASTAL STATES, RIO, SAO
147 # BRAZIL PAULO, BRASILIA OCT 23,
148 # BRAZIL '88-FEB 11, '89
149 # BRAZIL (ESTIMATED)
150 # BRAZIL 2 H BEHIND UTC ATLANTIC ISLANDS, FERNANDO
151 # BRAZIL DE NORONHA
152 # BRAZIL 1 H BEHIND UTC OCT 23, '88-FEB 11, '89
153 # BRAZIL (ESTIMATED)
154 # BRAZIL 3 H BEHIND UTC FOR MOST MAJOR AIRPORTS.
156 # From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
157 # The mayor of Rio recently attempted to change the time zone rules
158 # just in his city, in order to leave more summer time for the tourist trade.
159 # The rule change lasted only part of the day;
160 # the federal government refused to follow the city's rules, and business
161 # was in a chaos, so the mayor backed down that afternoon.
162 # Shanks claims Acre stopped observing DST after 1988 Feb 7, but it
163 # could just be that his table ran out of room. We're extrapolating
164 # about time zone changes after 1990 Feb 11.
166 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
167 Rule Brazil 1914 only - Jan 1 0:00 0 S
168 Rule Brazil 1931 only - Oct 3 11:00 1 D
169 Rule Brazil 1932 1933 - Apr 1 0:00 0 S
170 Rule Brazil 1932 only - Oct 3 0:00 1 D
171 Rule Brazil 1949 1952 - Dec 1 0:00 1 D
172 Rule Brazil 1950 only - Apr 16 0:00 0 S
173 Rule Brazil 1951 1953 - Apr 1 0:00 0 S
174 Rule Brazil 1963 only - Dec 9 0:00 1 D
175 Rule Brazil 1964 only - Mar 1 0:00 0 S
176 Rule Brazil 1965 only - Jan 31 0:00 1 D
177 Rule Brazil 1965 only - Apr 1 0:00 0 S
178 Rule Brazil 1965 only - Dec 1 0:00 1 D
179 Rule Brazil 1966 1968 - Mar 1 0:00 0 S
180 Rule Brazil 1966 1967 - Nov 1 0:00 1 D
181 Rule Brazil 1985 only - Nov 2 0:00 1 D
182 Rule Brazil 1986 only - Mar 15 0:00 0 S
183 Rule Brazil 1986 1987 - Oct Sat<=28 0:00 1 D
184 Rule Brazil 1987 only - Feb 14 0:00 0 S
185 Rule Brazil 1988 only - Feb 7 0:00 0 S
186 Rule Brazil 1989 only - Jan 22 0:00 0 S
187 Rule Brazil 1988 max - Oct Sun>=15 0:00 1 D
188 Rule Brazil 1990 max - Feb Sun>=8 0:00 0 S
189 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
190 Zone America/Noronha -2:09:40 - LMT 1914
191 -2:00 - FST 1963 Dec 9
192 -2:00 Brazil F%sT
193 Zone America/Sao_Paulo -3:06:28 - LMT 1914
194 -3:00 Brazil E%sT
195 Zone America/Manaus -4:00:04 - LMT 1914
196 -4:00 - WST 1963 Dec 9
197 -4:00 Brazil W%sT
198 # Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
199 Zone America/Porto_Acre -4:31:12 - LMT 1914
200 -5:00 - AST 1963 Dec 9
201 -5:00 Brazil A%sT
202 #
203 # Martin Vaz and Trinidade are like America/Noronha.
206 # Chile
208 # From Eduardo Krell (1995-10-19):
209 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
210 # of October.... The law is the same for March and October.
212 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
213 Rule Chile 1918 only - Sep 1 0:00 1:00 D
214 Rule Chile 1919 only - Jul 2 0:00 0 S
215 Rule Chile 1927 1931 - Sep 1 0:00 1:00 D
216 Rule Chile 1928 1932 - Apr 1 0:00 0 S
217 Rule Chile 1969 max - Oct Sun>=9 0:00 1:00 D
218 Rule Chile 1970 max - Mar Sun>=9 0:00 0 S
219 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
220 Zone America/Santiago -4:42:40 - LMT 1890
221 -4:43 - SMT 1910 # Santiago Mean Time
222 -5:00 Chile C%sT 1932 Sep
223 -4:00 Chile C%sT
224 Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
225 -7:17 - MMT 1932 Sep # Mataveri Mean Time
226 -7:00 Chile M%sT 1982 Mar 14
227 -6:00 Chile C%sT
228 #
229 # Whitman says Juan Fernandez Is are like America/Santiago.
230 # San Ambrosio, San Felix
231 # no information; probably like America/Santiago
234 # Colombia
235 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
236 Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
237 -4:56 - BMT 1914 Nov 23 # Bogota Mean Time
238 -5:00 - EST
239 # Malpelo, Providencia, San Andres
240 # no information; probably like America/Bogota
242 # Curacao
243 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
244 Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
245 -4:30 - NAST 1965 # Netherlands Antilles
246 -4:00 - AST
248 # Ecuador
249 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
250 Zone America/Guayaquil -5:19:20 - LMT 1890
251 -5:14 - QMT 1931 # Quito Mean Time
252 -5:00 - EST
253 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
254 -5:00 - EST 1986
255 -6:00 - CST
257 # Falklands
258 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
259 Rule Falk 1912 only - Mar 12 0:00 0 S
260 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 D
261 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 S
262 Rule Falk 1939 only - Oct 1 0:00 1:00 D
263 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 D
264 Rule Falk 1943 only - Jan 1 0:00 0 S
265 Rule Falk 1983 only - Sep lastSun 0:00 1:00 D
266 Rule Falk 1984 1985 - Apr lastSun 0:00 0 S
267 Rule Falk 1984 only - Sep 16 0:00 1:00 D
268 Rule Falk 1985 max - Sep Sun>=9 0:00 1:00 D
269 Rule Falk 1986 max - Apr Sun>=16 0:00 0 S
270 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
271 Zone Atlantic/Stanley -3:51:24 - LMT 1890
272 -3:51 - SMT 1912 Mar 12 # Stanley Mean Time
273 -4:00 Falk A%sT 1983 May
274 -3:00 Falk E%sT 1985 Sep 15
275 -4:00 Falk A%sT
277 # French Guiana
278 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
279 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
280 -4:00 - AST 1967 Oct
281 -3:00 - EST
283 # Guyana
284 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
285 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
286 -3:45 - BGST 1975 Jul 31 # British Guiana ST
287 -3:00 - EST
290 # Paraguay
292 # From Bob Devine (January 28, 1988):
293 # Paraguay: First day in October to last in March. Midnight switch??
294 # Since 1980.
296 # From U. S. Naval Observatory (January 19, 1989):
297 # PARAGUAY 4 H BEHIND UTC
298 # PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89
300 # From Shanks (1991):
301 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
302 Rule Para 1974 only - Apr 1 0:00 0 S
303 Rule Para 1975 1978 - Oct 1 0:00 1:00 D
304 Rule Para 1975 1978 - Mar 1 0:00 0 S
305 # Shanks says 1979 was all DST.
306 Rule Para 1980 max - Apr 1 0:00 0 S
307 Rule Para 1980 1988 - Oct 1 0:00 1:00 D
308 Rule Para 1989 only - Oct 22 0:00 1:00 D
309 Rule Para 1990 max - Oct 1 0:00 1:00 D
310 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
311 Zone America/Asuncion -3:50:40 - LMT 1890
312 -3:51 - AMT 1931 Oct 10 # Asuncion Mean Time
313 -4:00 - AST 1972 Oct
314 -3:00 - EST 1974 Apr
315 -4:00 Para A%sT
317 # Peru
318 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
319 Rule Peru 1908 only - Jul 28 0:00 0 S
320 Rule Peru 1938 only - Jan 1 0:00 1:00 D
321 Rule Peru 1938 only - Apr 1 0:00 0 S
322 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 D
323 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 S
324 Rule Peru 1987 only - Jan 1 0:00 1:00 D
325 Rule Peru 1987 only - Apr 1 0:00 0 S
326 Rule Peru 1990 only - Jan 1 0:00 1:00 D
327 Rule Peru 1990 only - Apr 1 0:00 0 S
328 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
329 Zone America/Lima -5:08:12 - LMT 1890
330 -5:09 - LMT 1908 Jul 28
331 -5:00 Peru E%sT
333 # South Georgia
334 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
335 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
336 -2:00 - FST
338 # South Sandwich Is
339 # uninhabited
341 # Suriname
342 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
343 Zone America/Paramaribo -3:40:40 - LMT 1911
344 -3:40:52 - PMT 1935 # Paramaribo Mean Time
345 -3:40:36 - PMT 1945 Oct # The capital moved?
346 -3:30 - DGST 1984 Oct # Dutch Guiana Std Time
347 -3:00 - EST
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 Rule Uruguay 1920 only - May 1 0:00 0 S
360 # Whitman gives 1923 Oct 1; go with Shanks.
361 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HD
362 Rule Uruguay 1924 1926 - Apr 1 0:00 0 S
363 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HD
364 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HD
365 # Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
366 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 S
367 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HD
368 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 S
369 # Whitman gives 1937 Oct 3; go with Shanks.
370 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HD
371 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
372 # and 1943 Apr 13 ``to present time''; go with Shanks.
373 Rule Uruguay 1941 only - Aug 1 0:00 0 S
374 Rule Uruguay 1942 only - Jan 1 0:00 0:30 HD
375 Rule Uruguay 1942 only - Dec 14 0:00 1:00 D
376 Rule Uruguay 1943 only - Mar 14 0:00 0 S
377 Rule Uruguay 1959 only - May 24 0:00 1:00 D
378 Rule Uruguay 1959 only - Nov 15 0:00 0 S
379 Rule Uruguay 1960 only - Jan 17 0:00 1:00 D
380 Rule Uruguay 1960 only - Mar 6 0:00 0 S
381 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 D
382 Rule Uruguay 1965 only - Sep 26 0:00 0 S
383 Rule Uruguay 1966 1967 - Oct 31 0:00 0 S
384 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HD
385 Rule Uruguay 1968 1970 - Dec 2 0:00 0 S
386 Rule Uruguay 1972 only - Apr 24 0:00 1:00 D
387 Rule Uruguay 1972 only - Aug 15 0:00 0 S
388 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HD
389 Rule Uruguay 1974 only - Dec 22 0:00 1:00 D
390 Rule Uruguay 1976 only - Oct 1 0:00 0 S
391 Rule Uruguay 1977 only - Dec 4 0:00 1:00 D
392 Rule Uruguay 1978 only - Apr 1 0:00 0 S
393 Rule Uruguay 1979 only - Oct 1 0:00 1:00 D
394 Rule Uruguay 1980 only - May 1 0:00 0 S
395 Rule Uruguay 1987 only - Dec 14 0:00 1:00 D
396 Rule Uruguay 1988 only - Mar 14 0:00 0 S
397 Rule Uruguay 1988 only - Dec 11 0:00 1:00 D
398 Rule Uruguay 1989 only - Mar 12 0:00 0 S
399 Rule Uruguay 1989 only - Oct 29 0:00 1:00 D
400 Rule Uruguay 1990 only - Mar 4 0:00 0 S
401 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
402 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
403 -3:45 - MMT 1920 May 1 # Montevideo MT
404 -3:30 Uruguay U%sT 1942 Dec 14 # Uruguay ST
405 -3:00 Uruguay E%sT
407 # Venezuela
408 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
409 Zone America/Caracas -4:27:44 - LMT 1890
410 -4:28 - CMT 1912 Feb 12 # Caracas Mean Time
411 -4:30 - VZT 1965 # Venezuela Time
412 -4:00 - AST