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1 # @(#)southamerica 7.22
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> (1996-11-22):
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 # Earlier editions of these tables used the North American style (e.g. ARST and
32 # ARDT for Argentine Standard and Daylight Time), but the following quote
33 # suggests that it's better to use European style (e.g. ART and ARST).
34 # I suggest the use of _Summer time_ instead of the more cumbersome
35 # _daylight-saving time_. _Summer time_ seems to be in general use
36 # in Europe and South America.
37 # -- E O Cutler, _New York Times_ (1937-02-14), quoted in
38 # H L Mencken, _The American Language: Supplement I_ (1960), p 466
41 # From Guy Harris:
42 # From Official Airline Guide - Worldwide Edition (1987). Countries not
43 # listed here do not observe DST, according to the OAG. Time zone names
44 # are pure inventions, and none are supplied for countries not observing
45 # DST; updates from natives would be appreciated. The times that DST
46 # starts and ends are based on the assumption that they switch a 2AM just
47 # as everybody else does.
49 ###############################################################################
51 ###############################################################################
53 # Argentina
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.
59 # From U. S. Naval Observatory (1988-01-199):
60 # ARGENTINA 3 H BEHIND UTC
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.
66 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
67 Rule Arg 1930 only - Dec 1 0:00 1:00 S
68 Rule Arg 1931 only - Apr 1 0:00 0 -
69 Rule Arg 1931 only - Oct 15 0:00 1:00 S
70 Rule Arg 1932 1940 - Mar 1 0:00 0 -
71 Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
72 Rule Arg 1940 only - Jul 1 0:00 1:00 S
73 Rule Arg 1941 only - Jun 15 0:00 0 -
74 Rule Arg 1941 only - Oct 15 0:00 1:00 S
75 Rule Arg 1943 only - Aug 1 0:00 0 -
76 Rule Arg 1943 only - Oct 15 0:00 1:00 S
77 Rule Arg 1946 only - Mar 1 0:00 0 -
78 Rule Arg 1946 only - Oct 1 0:00 1:00 S
79 Rule Arg 1963 only - Oct 1 0:00 0 -
80 Rule Arg 1963 only - Dec 15 0:00 1:00 S
81 Rule Arg 1964 1966 - Mar 1 0:00 0 -
82 Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
83 Rule Arg 1967 only - Apr 1 0:00 0 -
84 Rule Arg 1967 1968 - Oct Sun<=7 0:00 1:00 S
85 Rule Arg 1968 1969 - Apr Sun<=7 0:00 0 -
86 Rule Arg 1974 only - Jan 23 0:00 1:00 S
87 Rule Arg 1974 only - May 1 0:00 0 -
88 Rule Arg 1974 1976 - Oct Sun<=7 0:00 1:00 S
89 Rule Arg 1975 1977 - Apr Sun<=7 0:00 0 -
90 Rule Arg 1985 only - Nov 2 0:00 1:00 S
91 Rule Arg 1986 only - Mar 14 0:00 0 -
92 Rule Arg 1986 1987 - Oct 25 0:00 1:00 S
93 Rule Arg 1987 only - Feb 13 0:00 0 -
94 Rule Arg 1988 only - Feb 7 0:00 0 -
95 Rule 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 gives 1989 Mar 16 and stops after 1990 Mar 4; go with Otero.
104 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
105 Rule 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 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
113 #
114 # Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC),
115 # Tierra del Fuego (TF) & Antartida e Islas
116 Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
117 -4:16:44 - CMT 1920 May # Cordoba Mean Time
118 -4:00 - ART 1930 Dec
119 -4:00 Arg AR%sT 1969 Oct 5
120 -3:00 Arg AR%sT
121 #
122 # Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
123 # Formosa (FM), La Pampa (LP), Chubut (CH)
124 Zone America/Rosario -4:02:40 - LMT 1894 Nov
125 -4:16:44 - CMT 1920 May
126 -4:00 - ART 1930 Dec
127 -4:00 Arg AR%sT 1969 Oct 5
128 -3:00 Arg AR%sT 1991 Jul
129 -3:00 - ART
130 #
131 # Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL),
132 # Neuquen (NQ), Rio Negro (RN)
133 Zone America/Cordoba -4:16:44 - LMT 1894 Nov
134 -4:16:44 - CMT 1920 May
135 -4:00 - ART 1930 Dec
136 -4:00 Arg AR%sT 1969 Oct 5
137 -3:00 Arg AR%sT 1990 Jul
138 -3:00 - ART
139 #
140 # Jujuy (JY)
141 Zone America/Jujuy -4:21:12 - LMT 1894 Nov
142 -4:16:44 - CMT 1920 May
143 -4:00 - ART 1930 Dec
144 -4:00 Arg AR%sT 1969 Oct 5
145 -3:00 Arg AR%sT 1991 Mar 3
146 -4:00 - WART 1991 Oct 6
147 -4:00 1:00 WARST 1992 Mar 15
148 -4:00 - WART 1992 Oct 18
149 -3:00 - ART
150 #
151 # Catamarca (CT)
152 Zone America/Catamarca -4:23:08 - LMT 1894 Nov
153 -4:16:44 - CMT 1920 May
154 -4:00 - ART 1930 Dec
155 -4:00 Arg AR%sT 1969 Oct 5
156 -3:00 Arg AR%sT 1990 Jul
157 -3:00 - ART 1991 Jul
158 -3:00 Arg AR%sT 1992 Jul
159 -3:00 - ART
160 #
161 # Mendoza (MZ)
162 Zone America/Mendoza -4:35:16 - LMT 1894 Nov
163 -4:16:44 - CMT 1920 May
164 -4:00 - ART 1930 Dec
165 -4:00 Arg AR%sT 1969 Oct 5
166 -3:00 Arg AR%sT 1991 Mar 3
167 -4:00 - WART 1991 Oct 15
168 -4:00 1:00 WARST 1992 Mar 1
169 -4:00 - WART 1992 Oct 18
170 -3:00 - ART
172 # Aruba
173 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
174 Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
175 -4:30 - ANT 1965 # Netherlands Antilles Time
176 -4:00 - AST
178 # Bolivia
179 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
180 Zone America/La_Paz -4:32:36 - LMT 1890
181 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time
182 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
183 -4:00 - BOT # Bolivia Time
185 # Brazil
187 # From Guy Harris:
188 # The OAG lists 1987-10-25 and 1988-02-12 as the starting and
189 # ending dates, giving them as "estimated date(s) based on previous year". We
190 # infer a rule here from one example, always a dangerous practice.... Yes,
191 # they really do switch on Saturday, according to the OAG.
192 # "[America/Porto_Acre]" is for the [State] of Acre;
193 # "[America/Noronha]" is for Fernando De Noronha.
195 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
196 # The mayor of Rio recently attempted to change the time zone rules
197 # just in his city, in order to leave more summer time for the tourist trade.
198 # The rule change lasted only part of the day;
199 # the federal government refused to follow the city's rules, and business
200 # was in a chaos, so the mayor backed down that afternoon.
202 # From IATA SSIM (1996-02):
203 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
204 # Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
205 # Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
206 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
207 # [The last three states are new to this issue of the IATA SSIM.]
209 # From Gwillim Law (1996-10-07):
210 # Geography, history (Tocantins was part of Goias until 1989), and other
211 # sources of time zone information lead me to believe that AL, SE, and TO were
212 # always in BR1, and so the only change was whether or not they observed DST....
213 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
214 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
215 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
216 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
217 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
218 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
219 # become part of the state of Pernambuco). The boundary between BR1 and BR2
220 # has never been clearly stated. They've simply been called East and West.
221 # However, some conclusions can be drawn from another IATA manual: the Airline
222 # Coding Directory, which lists close to 400 airports in Brazil. For each
223 # airport it gives a time zone which is coded to the SSIM. From that
224 # information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
225 # Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
226 # Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
228 # From Paul Eggert (1996-11-22):
229 # Let's make the following assumptions:
230 #
231 # * All data in Shanks are correct through 1990. In particular,
232 # Shanks was right when he said Acre stopped observing DST in mid-1988.
233 # * Areas where Shanks reports DST up to 1990, but the IATA reports no DST
234 # in 1995, stopped observing DST in mid-1990.
235 #
236 # Under these assumptions Brazil needs 7 entries to cover all the distinct
237 # time zone histories since 1970:
238 #
239 # Noronha (UTC-2), Fortaleza (UTC-3), and Manaus (UTC-4) stopped observing DST
240 # in mid-1990.
241 # Maceio (UTC-3) stopped observing DST in mid-1990, but started again mid-1995.
242 # Sao Paulo (UTC-3) and Cuiaba (UTC-4) always observed DST.
243 # Porto Acre (UTC-5) stopped observing DST in mid-1988.
245 # From Rodrigo Feher <feher@pobox.com> (1998-01-17):
246 # Reading "southamerica" file in timezone 7.55 I've found an
247 # error. Line 193 say "Territory of Acre". It is not a territory anymore
248 # but a state.
250 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
251 Rule Brazil 1931 only - Oct 3 11:00 1:00 D
252 Rule Brazil 1932 1933 - Apr 1 0:00 0 S
253 Rule Brazil 1932 only - Oct 3 0:00 1:00 D
254 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 D
255 Rule Brazil 1950 only - Apr 16 0:00 0 S
256 Rule Brazil 1951 1953 - Apr 1 0:00 0 S
257 Rule Brazil 1963 only - Dec 9 0:00 1:00 D
258 Rule Brazil 1964 only - Mar 1 0:00 0 S
259 Rule Brazil 1965 only - Jan 31 0:00 1:00 D
260 Rule Brazil 1965 only - Apr 1 0:00 0 S
261 Rule Brazil 1965 only - Dec 1 0:00 1:00 D
262 Rule Brazil 1966 1968 - Mar 1 0:00 0 S
263 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 D
264 Rule Brazil 1985 only - Nov 2 0:00 1:00 D
265 Rule Brazil 1986 only - Mar 15 0:00 0 S
266 Rule Brazil 1986 1987 - Oct Sat<=28 0:00 1:00 D
267 Rule Brazil 1987 only - Feb 14 0:00 0 S
268 Rule Brazil 1988 only - Feb 7 0:00 0 S
269 Rule Brazil 1989 only - Jan 22 0:00 0 S
270 Rule Brazil 1988 1989 - Oct Sun>=10 0:00 1:00 D
271 Rule Brazil 1990 1991 - Feb Sun>=11 0:00 0 S
272 Rule Brazil 1990 1992 - Oct Sun>=20 0:00 1:00 D
273 Rule Brazil 1992 only - Feb 9 0:00 0 S
274 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 D
275 Rule Brazil 1993 only - Jan 31 0:00 0 S
276 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 S
277 Rule Brazil 1996 max - Feb Sun>=11 0:00 0 S
278 Rule Brazil 1996 max - Oct Sun>=1 0:00 1:00 D
280 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
281 #
282 # Fernando de Noronha
283 Zone America/Noronha -2:09:40 - LMT 1914
284 -2:00 - FST 1963 Dec 9
285 -2:00 Brazil F%sT 1990 Jul
286 -2:00 - FST
287 #
288 # Amapa, east Para, Maranhao, Piaui, Ceara, Rio Grande do Norte, Paraiba,
289 # Pernambuco (except Fernando de Noronha)
290 Zone America/Fortaleza -2:34:00 - LMT 1914
291 -3:00 - EST 1963 Dec 9
292 -3:00 Brazil E%sT 1990 Jul
293 -3:00 - EST
294 #
295 # Alagoas, Sergipe, Tocantins
296 Zone America/Maceio -2:22:52 - LMT 1914
297 -3:00 - EST 1963 Dec 9
298 -3:00 Brazil E%sT 1990 Jul
299 -3:00 - EST 1995 Jul
300 -3:00 Brazil E%sT
301 #
302 # Bahia, Goias, Distrito Federal, Minas Gerais, Espirito Santo, Rio de Janeiro,
303 # Sao Paulo, Parana, Santa Catarina, Rio Grande do Sul
304 Zone America/Sao_Paulo -3:06:28 - LMT 1914
305 -3:00 Brazil E%sT
306 #
307 # Mato Grosso, Mato Grosso do Sul
308 Zone America/Cuiaba -3:44:20 - LMT 1914
309 -4:00 - WST 1963 Dec 9
310 -4:00 Brazil W%sT
311 #
312 # Roraima, west Para, Amazonas, Rondonia
313 Zone America/Manaus -4:00:04 - LMT 1914
314 -4:00 - WST 1963 Dec 9
315 -4:00 Brazil W%sT 1990 Jul
316 -4:00 - WST
317 #
318 # Acre
319 # Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
320 Zone America/Porto_Acre -4:31:12 - LMT 1914
321 -5:00 - AST 1963 Dec 9
322 -5:00 Brazil A%sT 1988 Jul
323 -5:00 - AST
324 #
325 # Martin Vaz and Trinidade are like America/Noronha.
328 # Chile
330 # From Eduardo Krell (1995-10-19):
331 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
332 # of October.... The law is the same for March and October.
334 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
335 Rule Chile 1918 only - Sep 1 0:00 1:00 S
336 Rule Chile 1919 only - Jul 2 0:00 0 -
337 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
338 Rule Chile 1928 1932 - Apr 1 0:00 0 -
339 Rule Chile 1969 max - Oct Sun>=9 0:00 1:00 S
340 Rule Chile 1970 max - Mar Sun>=9 0:00 0 -
341 # IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
342 # (1996-09) says 1998-03-08. Ignore these for now.
343 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
344 Zone America/Santiago -4:42:40 - LMT 1890
345 -4:42:40 - SMT 1910 # Santiago Mean Time
346 -5:00 Chile CL%sT 1932 Sep # Chile Time
347 -4:00 Chile CL%sT
348 Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
349 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
350 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
351 -6:00 Chile EAS%sT
352 #
353 # Whitman says Juan Fernandez Is are like America/Santiago.
354 # San Ambrosio, San Felix
355 # no information; probably like America/Santiago
358 # Colombia
359 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
360 Rule CO 1992 only - May 2 0:00 1:00 S
361 Rule CO 1992 only - Dec 31 0:00 0 -
362 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
363 Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
364 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
365 -5:00 CO CO%sT # Colombia Time
366 # Malpelo, Providencia, San Andres
367 # no information; probably like America/Bogota
369 # Curacao
370 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
371 Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
372 -4:30 - ANT 1965 # Netherlands Antilles Time
373 -4:00 - AST
375 # Ecuador
376 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
377 Zone America/Guayaquil -5:19:20 - LMT 1890
378 -5:14:00 - QMT 1931 # Quito Mean Time
379 -5:00 - ECT # Ecuador Time
380 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
381 -5:00 - ECT 1986
382 -6:00 - GALT # Galapagos Time
384 # Falklands
385 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
386 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
387 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
388 Rule Falk 1939 only - Oct 1 0:00 1:00 S
389 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
390 Rule Falk 1943 only - Jan 1 0:00 0 -
391 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
392 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
393 Rule Falk 1984 only - Sep 16 0:00 1:00 S
394 Rule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S
395 Rule Falk 1986 max - Apr Sun>=16 0:00 0 -
396 Rule Falk 1996 max - Sep Sun>=8 0:00 1:00 S
397 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
398 Zone Atlantic/Stanley -3:51:24 - LMT 1890
399 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
400 -4:00 Falk FK%sT 1983 May # Falkland Is Time
401 -3:00 Falk FK%sT 1985 Sep 15
402 -4:00 Falk FK%sT
404 # French Guiana
405 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
406 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
407 -4:00 - GFT 1967 Oct # French Guiana Time
408 -3:00 - GFT
410 # Guyana
411 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
412 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
413 -3:45 - GBGT 1966 May 26 # Br Guiana Time
414 -3:45 - GYT 1975 Jul 31 # Guyana Time
415 -3:00 - GYT 1991
416 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
417 -4:00 - GYT
419 # Paraguay
421 # From Bob Devine (1988-01-28):
422 # Paraguay: First day in October to last in March. Midnight switch??
423 # Since 1980.
425 # From U. S. Naval Observatory (1989-01-19):
426 # PARAGUAY 4 H BEHIND UTC
427 # PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89
429 # From Shanks (1991):
430 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
431 Rule Para 1975 1978 - Oct 1 0:00 1:00 S
432 Rule Para 1975 1978 - Mar 1 0:00 0 -
433 # Shanks says 1979 was all DST.
434 Rule Para 1980 1991 - Apr 1 0:00 0 -
435 Rule Para 1980 1988 - Oct 1 0:00 1:00 S
436 Rule Para 1989 only - Oct 22 0:00 1:00 S
437 Rule Para 1990 only - Oct 1 0:00 1:00 S
438 Rule Para 1991 only - Oct 6 0:00 1:00 S
439 Rule Para 1992 only - Mar 1 0:00 0 -
440 Rule Para 1992 only - Oct 5 0:00 1:00 S
441 Rule Para 1993 only - Mar 31 0:00 0 -
442 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
443 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
444 Rule Para 1996 max - Mar 1 0:00 0 -
445 Rule Para 1996 only - Oct 6 0:00 1:00 S
446 Rule Para 1997 max - Oct 1 0:00 1:00 S
447 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
448 Zone America/Asuncion -3:50:40 - LMT 1890
449 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
450 -4:00 - PYT 1972 Oct # Paraguay Time
451 -3:00 - PYT 1974 Apr
452 -4:00 Para PY%sT
454 # Peru
455 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
456 Rule Peru 1938 only - Jan 1 0:00 1:00 S
457 Rule Peru 1938 only - Apr 1 0:00 0 -
458 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
459 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
460 Rule Peru 1987 only - Jan 1 0:00 1:00 S
461 Rule Peru 1987 only - Apr 1 0:00 0 -
462 Rule Peru 1990 only - Jan 1 0:00 1:00 S
463 Rule Peru 1990 only - Apr 1 0:00 0 -
464 Rule Peru 1993 only - Jan 1 0:00 1:00 S
465 Rule Peru 1993 only - Apr 1 0:00 0 -
466 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
467 Zone America/Lima -5:08:12 - LMT 1890
468 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
469 -5:00 Peru PE%sT # Peru Time
471 # South Georgia
472 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
473 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
474 -2:00 - GST # South Georgia Time
476 # South Sandwich Is
477 # uninhabited
479 # Suriname
480 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
481 Zone America/Paramaribo -3:40:40 - LMT 1911
482 -3:40:52 - PMT 1935 # Paramaribo Mean Time
483 -3:40:36 - PMT 1945 Oct # The capital moved?
484 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
485 -3:30 - SRT 1984 Oct # Suriname Time
486 -3:00 - SRT
488 # Trinidad and Tobago
489 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
490 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
491 -4:00 - AST
493 # Uruguay
494 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
495 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
496 # From Shanks (1991):
497 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
498 # Whitman gives 1923 Oct 1; go with Shanks.
499 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
500 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
501 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
502 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
503 # Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
504 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
505 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
506 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
507 # Whitman gives 1937 Oct 3; go with Shanks.
508 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
509 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
510 # and 1943 Apr 13 ``to present time''; go with Shanks.
511 Rule Uruguay 1941 only - Aug 1 0:00 0 -
512 Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
513 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
514 Rule Uruguay 1943 only - Mar 14 0:00 0 -
515 Rule Uruguay 1959 only - May 24 0:00 1:00 S
516 Rule Uruguay 1959 only - Nov 15 0:00 0 -
517 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
518 Rule Uruguay 1960 only - Mar 6 0:00 0 -
519 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
520 Rule Uruguay 1965 only - Sep 26 0:00 0 -
521 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
522 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
523 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
524 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
525 Rule Uruguay 1972 only - Aug 15 0:00 0 -
526 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
527 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
528 Rule Uruguay 1976 only - Oct 1 0:00 0 -
529 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
530 Rule Uruguay 1978 only - Apr 1 0:00 0 -
531 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
532 Rule Uruguay 1980 only - May 1 0:00 0 -
533 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
534 Rule Uruguay 1988 only - Mar 14 0:00 0 -
535 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
536 Rule Uruguay 1989 only - Mar 12 0:00 0 -
537 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
538 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
539 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
540 # Shanks's 4th edition (1995) says no DST was observed in 1990/1 and 1991/2,
541 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
542 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
543 Rule Uruguay 1993 only - Feb 28 0:00 0 -
544 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
545 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
546 -3:44:44 - MMT 1920 May 1 # Montevideo MT
547 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
548 -3:00 Uruguay UY%sT
550 # Venezuela
551 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
552 Zone America/Caracas -4:27:44 - LMT 1890
553 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
554 -4:30 - VET 1965 # Venezuela Time
555 -4:00 - VET