| blob | 3a61cd717af94c06ccbefa906e2fd95caddf55c3 |
1 # @(#)southamerica 8.1
2 # <pre>
4 # This data is by no means authoritative; if you think you know better,
5 # go ahead and edit the file (and please send any changes to
6 # tz@elsie.nci.nih.gov for general use in the future).
8 # From Paul Eggert (1999-07-07):
9 # A good source for time zone historical data outside the U.S. is
10 # Thomas G. Shanks, The International Atlas (5th edition),
11 # San Diego: ACS Publications, Inc. (1999).
12 #
13 # Gwillim Law writes that a good source
14 # for recent time zone data is the International Air Transport
15 # Association's Standard Schedules Information Manual (IATA SSIM),
16 # published semiannually. Law sent in several helpful summaries
17 # of the IATA's data after 1990.
18 #
19 # Except where otherwise noted, Shanks is the source for entries through 1990,
20 # and IATA SSIM is the source for entries after 1990.
21 #
22 # Earlier editions of these tables used the North American style (e.g. ARST and
23 # ARDT for Argentine Standard and Daylight Time), but the following quote
24 # suggests that it's better to use European style (e.g. ART and ARST).
25 # I suggest the use of _Summer time_ instead of the more cumbersome
26 # _daylight-saving time_. _Summer time_ seems to be in general use
27 # in Europe and South America.
28 # -- E O Cutler, _New York Times_ (1937-02-14), quoted in
29 # H L Mencken, _The American Language: Supplement I_ (1960), p 466
30 #
31 # Earlier editions of these tables also used the North American style
32 # for time zones in Brazil, but this was incorrect, as Brazilians say
33 # "summer time". Reinaldo Goulart, a Sao Paulo businessman active in
34 # the railroad sector, writes (1999-07-06):
35 # The subject of time zones is currently a matter of discussion/debate in
36 # Brazil. Let's say that "the Brasilia time" is considered the
37 # "official time" because Brasilia is the capital city.
38 # The other three time zones are called "Brasilia time "minus one" or
39 # "plus one" or "plus two". As far as I know there is no such
40 # name/designation as "Eastern Time" or "Central Time".
41 # So I invented the following (English-language) abbreviations for now.
42 # Corrections are welcome!
43 # std dst
44 # -2:00 FNT FNST Fernando de Noronha
45 # -3:00 BRT BRST Brasilia
46 # -4:00 AMT AMST Amazon
47 # -5:00 ACT ACST Acre
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 (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 2 0:00 0 -
84 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
85 Rule Arg 1968 1969 - Apr Sun>=1 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 1988 only - Dec 1 0:00 1:00 S
89 #
90 # From Hernan G. Otero (1995-06-26):
91 # These corrections were contributed by InterSoft Argentina S.A.,
92 # obtaining the data from the:
93 # Talleres de Hidrografia Naval Argentina
94 # (Argentine Naval Hydrography Institute)
95 #
96 # Shanks stops after 1992-03-01; 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 (1995-06-26):
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 # From Rives McDow (2000-01-10):
106 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
107 # which did not result in the switch of a time zone, as they stayed 9 hours
108 # from the International Date Line.
109 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
110 Rule Arg 2000 only - Mar Sun>=1 0:00 0 -
111 #
112 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
113 # We just checked with our Sao Paulo office and they say the government of
114 # Argentina decided not to become one of the countries that go on or off DST.
115 # So Buenos Aires should be -3 hours from GMT at all times.
116 #
117 # From Fabian L. Arce Jofre (2000-04-04):
118 # The law that claimed DST for Argentina was derogated by President Fernando
119 # de la Rua on March 2, 2000, because it would make people spend more energy
120 # in the winter time, rather than less. The change took effect on March 3.
121 #
122 # From Mariano Absatz (2001-06-06):
123 # one of the major newspapers here in Argentina said that the 1999
124 # Timezone Law (which never was effectively applied) will (would?) be
125 # in effect.... The article is at
126 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm
127 # ... The Law itself is "Ley No 25155", sanctioned on 1999-08-25, enacted
128 # 1999-09-17, and published 1999-09-21. The official publication is at:
129 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
130 # Regretfully, you have to subscribe (and pay) for the on-line version....
131 #
132 # (2001-06-12):
133 # the timezone for Argentina will not change next Sunday.
134 # Apparently it will do so on Sunday 24th....
135 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm
136 #
137 # (2001-06-25):
138 # Last Friday (yes, the last working day before the date of the change), the
139 # Senate annulled the 1999 law that introduced the changes later postponed.
140 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
141 # It remains the vote of the Deputies..., but it will be the same....
142 # This kind of things had always been done this way in Argentina.
143 # We are still -03:00 all year round in all of the country.
144 #
145 # From Mariano Absatz (2004-05-21):
146 # Today it was officially published that the Province of Mendoza is changing
147 # its timezone this winter... starting tomorrow night....
148 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
149 # From Paul Eggert (2004-05-24):
150 # It's Law No. 7,210. This change is due to a public power emergency, so for
151 # now we'll assume it's for this year only.
152 #
153 # From Paul Eggert (2002-01-22):
154 # <a href="http://www.spicasc.net/horvera.html">
155 # Hora de verano para la Republica Argentina (2000-10-01)
156 # </a> says that standard time in Argentina from 1894-10-31
157 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
158 # over Shanks.
159 #
160 # From Mariano Absatz (2004-06-05):
161 # These media articles from a major newspaper mostly cover the current state:
162 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
163 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
164 #
165 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
166 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
167 # Apparently, all nine provinces would go back to UTC-03:00 at the same
168 # time in October 17th.
169 #
170 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
171 # Tierra del Fuego, Tucuman.
172 #
173 # From Mariano Absatz (2004-06-14):
174 # ... this weekend, the Province of Tucuman decided it'd go back to UTC-03:00
175 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
176 # annoyance with the change is much higher than the power savings obtained....
177 #
178 # From Gwillim Law (2004-06-14):
179 # http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
180 # "The time change in Tierra del Fuego was a conflicted decision from
181 # the start. The government had decreed that the measure would take
182 # effect on June 1, but a normative error forced the new time to begin
183 # three days earlier, from a Saturday to a Sunday....
184 # Our understanding was that the change was originally scheduled to take place
185 # on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
186 # provinces). Sunday was May 30, only two days earlier. So the article
187 # contains a contradiction. I would give more credence to the Saturday/Sunday
188 # date than the "three days earlier" phrase, and conclude that Tierra del
189 # Fuego set its clocks back at 2004-05-30 00:00.
190 #
191 # From Steffen Thorsen (2004-10-05):
192 # The previous law 7210 which changed the province of Mendoza's time zone
193 # back in May have been modified slightly in a new law 7277, which set the
194 # new end date to 2004-09-26 (original date was 2004-10-17).
195 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
196 #
197 # From Mariano Absatz (2004-10-05):
198 # San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
199 # Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
200 # at midnight between Saturday, July 24th and Sunday, July 25th....
201 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html
202 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html
203 # http://www.sanjuan.gov.ar/prensa/archivo/000441.html
205 # Unless otherwise specified, data are from Shanks through 1992, from
206 # the IATA otherwise. As noted below, Shanks says that
207 # America/Cordoba split into 6 subregions during 1991/1992, but we
208 # haven't verified this yet so for now we'll keep it a single region.
209 #
210 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
211 #
212 # Buenos Aires (BA), Capital Federal (CF),
213 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
214 -4:16:48 - CMT 1920 May # Cordoba Mean Time
215 -4:00 - ART 1930 Dec
216 -4:00 Arg AR%sT 1969 Oct 5
217 -3:00 Arg AR%sT 1999 Oct 3
218 -4:00 Arg AR%sT 2000 Mar 3
219 -3:00 - ART
220 #
221 # Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
222 # Formosa (FM), Salta (SA), Santiago del Estero (SE), Cordoba (CB),
223 # San Luis (SL), La Pampa (LP), Neuquen (NQ), Rio Negro (RN)
224 #
225 # Shanks also makes the following claims, which we haven't verified:
226 # - Formosa switched to -3:00 on 1991-01-07.
227 # - Misiones switched to -3:00 on 1990-12-29.
228 # - Chaco switched to -3:00 on 1991-01-04.
229 # - San Luis switched to -4:00 on 1990-03-14, then to -3:00 on 1990-10-15,
230 # then to -4:00 on 1991-03-01, then to -3:00 on 1991-06-01.
231 # - Santiago del Estero switched to -4:00 on 1991-04-01,
232 # then to -3:00 on 1991-04-26.
233 #
234 Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31
235 -4:16:48 - CMT 1920 May
236 -4:00 - ART 1930 Dec
237 -4:00 Arg AR%sT 1969 Oct 5
238 -3:00 Arg AR%sT 1991 Mar 3
239 -4:00 - WART 1991 Oct 20
240 -3:00 Arg AR%sT 1999 Oct 3
241 -4:00 Arg AR%sT 2000 Mar 3
242 -3:00 - ART
243 #
244 # Tucuman (TM)
245 Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
246 -4:16:48 - CMT 1920 May
247 -4:00 - ART 1930 Dec
248 -4:00 Arg AR%sT 1969 Oct 5
249 -3:00 Arg AR%sT 1991 Mar 3
250 -4:00 - WART 1991 Oct 20
251 -3:00 Arg AR%sT 1999 Oct 3
252 -4:00 Arg AR%sT 2000 Mar 3
253 -3:00 - ART 2004 Jun 1
254 -4:00 - WART 2004 Jun 13
255 -3:00 - ART
256 #
257 # La Rioja (LR)
258 Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
259 -4:16:48 - CMT 1920 May
260 -4:00 - ART 1930 Dec
261 -4:00 Arg AR%sT 1969 Oct 5
262 -3:00 Arg AR%sT 1991 Mar 1
263 -4:00 - WART 1991 May 7
264 -3:00 Arg AR%sT 1999 Oct 3
265 -4:00 Arg AR%sT 2000 Mar 3
266 -3:00 - ART 2004 Jun 1
267 -4:00 - WART 2004 Jun 20
268 -3:00 - ART
269 #
270 # San Juan (SJ)
271 Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
272 -4:16:48 - CMT 1920 May
273 -4:00 - ART 1930 Dec
274 -4:00 Arg AR%sT 1969 Oct 5
275 -3:00 Arg AR%sT 1991 Mar 1
276 -4:00 - WART 1991 May 7
277 -3:00 Arg AR%sT 1999 Oct 3
278 -4:00 Arg AR%sT 2000 Mar 3
279 -3:00 - ART 2004 May 31
280 -4:00 - WART 2004 Jul 25
281 -3:00 - ART
282 #
283 # Jujuy (JY)
284 Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
285 -4:16:48 - CMT 1920 May
286 -4:00 - ART 1930 Dec
287 -4:00 Arg AR%sT 1969 Oct 5
288 -3:00 Arg AR%sT 1990 Mar 4
289 -4:00 - WART 1990 Oct 28
290 -4:00 1:00 WARST 1991 Mar 17
291 -4:00 - WART 1991 Oct 6
292 -3:00 1:00 ARST 1992
293 -3:00 Arg AR%sT 1999 Oct 3
294 -4:00 Arg AR%sT 2000 Mar 3
295 -3:00 - ART
296 #
297 # Catamarca (CT), Chubut (CH)
298 Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
299 -4:16:48 - CMT 1920 May
300 -4:00 - ART 1930 Dec
301 -4:00 Arg AR%sT 1969 Oct 5
302 -3:00 Arg AR%sT 1991 Mar 3
303 -4:00 - WART 1991 Oct 20
304 -3:00 Arg AR%sT 1999 Oct 3
305 -4:00 Arg AR%sT 2000 Mar 3
306 -3:00 - ART 2004 Jun 1
307 -4:00 - WART 2004 Jun 20
308 -3:00 - ART
309 #
310 # Mendoza (MZ)
311 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
312 -4:16:48 - CMT 1920 May
313 -4:00 - ART 1930 Dec
314 -4:00 Arg AR%sT 1969 Oct 5
315 -3:00 Arg AR%sT 1990 Mar 4
316 -4:00 - WART 1990 Oct 15
317 -4:00 1:00 WARST 1991 Mar 1
318 -4:00 - WART 1991 Oct 15
319 -4:00 1:00 WARST 1992 Mar 1
320 -4:00 - WART 1992 Oct 18
321 -3:00 Arg AR%sT 1999 Oct 3
322 -4:00 Arg AR%sT 2000 Mar 3
323 -3:00 - ART 2004 May 23
324 -4:00 - WART 2004 Sep 26
325 -3:00 - ART
326 #
327 # Santa Cruz (SC)
328 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
329 -4:16:48 - CMT 1920 May # Cordoba Mean Time
330 -4:00 - ART 1930 Dec
331 -4:00 Arg AR%sT 1969 Oct 5
332 -3:00 Arg AR%sT 1999 Oct 3
333 -4:00 Arg AR%sT 2000 Mar 3
334 -3:00 - ART 2004 Jun 1
335 -4:00 - WART 2004 Jun 20
336 -3:00 - ART
337 #
338 # Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
339 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
340 -4:16:48 - CMT 1920 May # Cordoba Mean Time
341 -4:00 - ART 1930 Dec
342 -4:00 Arg AR%sT 1969 Oct 5
343 -3:00 Arg AR%sT 1999 Oct 3
344 -4:00 Arg AR%sT 2000 Mar 3
345 -3:00 - ART 2004 May 30
346 -4:00 - WART 2004 Jun 20
347 -3:00 - ART
349 # Aruba
350 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
351 Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
352 -4:30 - ANT 1965 # Netherlands Antilles Time
353 -4:00 - AST
355 # Bolivia
356 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
357 Zone America/La_Paz -4:32:36 - LMT 1890
358 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
359 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
360 -4:00 - BOT # Bolivia Time
362 # Brazil
364 # From Paul Eggert (1993-11-18):
365 # The mayor of Rio recently attempted to change the time zone rules
366 # just in his city, in order to leave more summer time for the tourist trade.
367 # The rule change lasted only part of the day;
368 # the federal government refused to follow the city's rules, and business
369 # was in a chaos, so the mayor backed down that afternoon.
371 # From IATA SSIM (1996-02):
372 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
373 # Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
374 # Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
375 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
376 # [The last three states are new to this issue of the IATA SSIM.]
378 # From Gwillim Law (1996-10-07):
379 # Geography, history (Tocantins was part of Goias until 1989), and other
380 # sources of time zone information lead me to believe that AL, SE, and TO were
381 # always in BR1, and so the only change was whether or not they observed DST....
382 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
383 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
384 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
385 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
386 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
387 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
388 # become part of the state of Pernambuco). The boundary between BR1 and BR2
389 # has never been clearly stated. They've simply been called East and West.
390 # However, some conclusions can be drawn from another IATA manual: the Airline
391 # Coding Directory, which lists close to 400 airports in Brazil. For each
392 # airport it gives a time zone which is coded to the SSIM. From that
393 # information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
394 # Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
395 # Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
397 # From Marcos Tadeu (1998-09-27):
398 # <a href="http://pcdsh01.on.br/verao1.html">
399 # Brazilian official page
400 # </a>
402 # From Jesper Norgaard (2000-11-03):
403 # [For an official list of which regions in Brazil use which time zones, see:]
404 # http://pcdsh01.on.br/Fusbr.htm
405 # http://pcdsh01.on.br/Fusbrhv.htm
407 # From Celso Doria via David Madeo (2002-10-09):
408 # The reason for the delay this year has to do with elections in Brazil.
409 #
410 # Unlike in the United States, elections in Brazil are 100% computerized and
411 # the results are known almost immediately. Yesterday, it was the first
412 # round of the elections when 115 million Brazilians voted for President,
413 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is
414 # counting (or re-counting) votes anymore and we know there will be a second
415 # round for the Presidency and also for some Governors. The 2nd round will
416 # take place on October 27th.
417 #
418 # The reason why the DST will only begin November 3rd is that the thousands
419 # of electoral machines used cannot have their time changed, and since the
420 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
421 # the Government decided to postpone DST, instead of changing the Constitution
422 # (maybe, for the next elections, it will be possible to change the clock)...
424 # From Rodrigo Severo (2004-10-04):
425 # It's just the biannual change made necessary by the much hyped, supposedly
426 # modern Brazilian eletronic voting machines which, apparently, can't deal
427 # with a time change between the first and the second rounds of the elections.
429 # From Paul Eggert (2002-10-10):
430 # The official decrees referenced below are mostly taken from
431 # <a href="http://pcdsh01.on.br/DecHV.html">
432 # Decretos sobre o Horario de Verao no Brasil
433 # </a> (2001-09-20, in Portuguese).
434 # The official site for all decrees, including those not related to time, is
435 # <a href="http://www.presidencia.gov.br/CCIVIL/decreto/principal_ano.htm">
436 # Presidencia da Republica, Subchefia para Assuntos Juridicos, Decretos
437 # </a> (in Portuguese).
439 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
440 # Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
441 # Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
442 Rule Brazil 1931 only - Oct 3 11:00 1:00 S
443 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
444 Rule Brazil 1932 only - Oct 3 0:00 1:00 S
445 # Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
446 # revoked DST.
447 # Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
448 # Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
449 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
450 Rule Brazil 1950 only - Apr 16 1:00 0 -
451 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
452 # Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
453 Rule Brazil 1953 only - Mar 1 0:00 0 -
454 # Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
455 # revoked DST.
456 # Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
457 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
458 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
459 # Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
460 # extended the above decree to all of the national territory on 12-09.
461 Rule Brazil 1963 only - Dec 9 0:00 1:00 S
462 # Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
463 # extended summer time by one day to 1964-03-01 00:00 (start of school).
464 Rule Brazil 1964 only - Mar 1 0:00 0 -
465 # Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
466 Rule Brazil 1965 only - Jan 31 0:00 1:00 S
467 Rule Brazil 1965 only - Mar 31 0:00 0 -
468 # Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
469 Rule Brazil 1965 only - Dec 1 0:00 1:00 S
470 # Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
471 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
472 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
473 # Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
474 # revoked DST.
475 # Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
476 Rule Brazil 1985 only - Nov 2 0:00 1:00 S
477 # Decree 92,310 (1986-01-21)
478 # Decree 92,463 (1986-03-13)
479 Rule Brazil 1986 only - Mar 15 0:00 0 -
480 # Decree 93,316 (1986-10-01)
481 Rule Brazil 1986 only - Oct 25 0:00 1:00 S
482 Rule Brazil 1987 only - Feb 14 0:00 0 -
483 # Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
484 Rule Brazil 1987 only - Oct 25 0:00 1:00 S
485 Rule Brazil 1988 only - Feb 7 0:00 0 -
486 # Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
487 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
488 Rule Brazil 1988 only - Oct 16 0:00 1:00 S
489 Rule Brazil 1989 only - Jan 29 0:00 0 -
490 # Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
491 # with the same exceptions
492 Rule Brazil 1989 only - Oct 15 0:00 1:00 S
493 Rule Brazil 1990 only - Feb 11 0:00 0 -
494 # Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
495 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
496 # Decree 99,629 (1990-10-19) adds BA, MT.
497 Rule Brazil 1990 only - Oct 21 0:00 1:00 S
498 Rule Brazil 1991 only - Feb 17 0:00 0 -
499 # <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
500 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
501 Rule Brazil 1991 only - Oct 20 0:00 1:00 S
502 Rule Brazil 1992 only - Feb 9 0:00 0 -
503 # <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
504 # adopted by same states.
505 Rule Brazil 1992 only - Oct 25 0:00 1:00 S
506 Rule Brazil 1993 only - Jan 31 0:00 0 -
507 # Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
508 # adopted by same states, plus AM.
509 # Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22;
510 # web page corrected 2004-01-07) adopted by same states, minus AM.
511 # Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
512 # adopted by same states, plus MT and TO.
513 # Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
514 # adds AL, SE.
515 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
516 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
517 Rule Brazil 1996 only - Feb 11 0:00 0 -
518 # Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
519 # adopted by same states, minus AL, SE.
520 Rule Brazil 1996 only - Oct 6 0:00 1:00 S
521 Rule Brazil 1997 only - Feb 16 0:00 0 -
522 # From Daniel C. Sobral (1998-02-12):
523 # In 1997, the DS began on October 6. The stated reason was that
524 # because international television networks ignored Brazil's policy on DS,
525 # they bought the wrong times on satellite for coverage of Pope's visit.
526 # This year, the ending date of DS was postponed to March 1
527 # to help dealing with the shortages of electric power.
528 #
529 # Decree 2,317 (1997-09-04), adopted by same states.
530 Rule Brazil 1997 only - Oct 6 0:00 1:00 S
531 # Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
532 # (1998-02-10)
533 Rule Brazil 1998 only - Mar 1 0:00 0 -
534 # Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
535 # adopted by the same states as before.
536 Rule Brazil 1998 only - Oct 11 0:00 1:00 S
537 Rule Brazil 1999 only - Feb 21 0:00 0 -
538 # Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
539 # (1999-08-23) adopted by same states.
540 # Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
541 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
542 Rule Brazil 1999 only - Oct 3 0:00 1:00 S
543 Rule Brazil 2000 only - Feb 27 0:00 0 -
544 # Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06)
545 # adopted by the same states as before.
546 # Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13)
547 # repeals DST in PE and RR, effective 2000-10-15 00:00.
548 # Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17)
549 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
550 # Decree <a href="http://pcdsh01.on.br/figuras/HV3916.gif">3,916</a>
551 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
552 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
553 Rule Brazil 2001 max - Feb Sun>=15 0:00 0 -
554 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
555 # <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm"></a>
556 Rule Brazil 2002 only - Nov 3 0:00 1:00 S
557 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
558 # <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm"></a>
559 Rule Brazil 2003 only - Oct 19 0:00 1:00 S
560 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
561 # <a href="http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm"></a>
562 Rule Brazil 2004 only - Nov 2 0:00 1:00 S
563 # Decree <a href="http://pcdsh01.on.br/DecHV5539.gif">5,539</a> (2005-09-19),
564 # adopted by the same states as before.
565 Rule Brazil 2005 max - Oct Sun>=15 0:00 1:00 S
566 # The latest ruleset listed above says that the following states observe DST:
567 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
568 # For dates after mid-2006, the above rules with TO="max" are guesses
569 # and are quite possibly wrong, but are more likely than no DST at all.
572 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
573 #
574 # Fernando de Noronha (administratively part of PE)
575 Zone America/Noronha -2:09:40 - LMT 1914
576 -2:00 Brazil FN%sT 1990 Sep 17
577 -2:00 - FNT 1999 Sep 30
578 -2:00 Brazil FN%sT 2000 Oct 15
579 -2:00 - FNT 2001 Sep 13
580 -2:00 Brazil FN%sT 2002 Oct 1
581 -2:00 - FNT
582 # Other Atlantic islands have no permanent settlement.
583 # These include Trindade and Martin Vaz (administratively part of ES),
584 # Atol das Rocas (RN), and Penedos de Sao Pedro e Sao Paulo (PE).
585 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
586 # it also included the Penedos.
587 #
588 # Amapa (AP), east Para (PA)
589 # East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu.
590 # The division between east and west Para is the river Xingu.
591 # In the north a very small part from the river Javary (now Jari I guess,
592 # the border with Amapa) to the Amazon, then to the Xingu.
593 Zone America/Belem -3:13:56 - LMT 1914
594 -3:00 Brazil BR%sT 1988 Sep 12
595 -3:00 - BRT
596 #
597 # Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
598 # Paraiba (PB)
599 Zone America/Fortaleza -2:34:00 - LMT 1914
600 -3:00 Brazil BR%sT 1990 Sep 17
601 -3:00 - BRT 1999 Sep 30
602 -3:00 Brazil BR%sT 2000 Oct 22
603 -3:00 - BRT 2001 Sep 13
604 -3:00 Brazil BR%sT 2002 Oct 1
605 -3:00 - BRT
606 #
607 # Pernambuco (PE) (except Atlantic islands)
608 Zone America/Recife -2:19:36 - LMT 1914
609 -3:00 Brazil BR%sT 1990 Sep 17
610 -3:00 - BRT 1999 Sep 30
611 -3:00 Brazil BR%sT 2000 Oct 15
612 -3:00 - BRT 2001 Sep 13
613 -3:00 Brazil BR%sT 2002 Oct 1
614 -3:00 - BRT
615 #
616 # Tocantins (TO)
617 Zone America/Araguaina -3:12:48 - LMT 1914
618 -3:00 Brazil BR%sT 1990 Sep 17
619 -3:00 - BRT 1995 Sep 14
620 -3:00 Brazil BR%sT 2003 Sep 24
621 -3:00 - BRT
622 #
623 # Alagoas (AL), Sergipe (SE)
624 Zone America/Maceio -2:22:52 - LMT 1914
625 -3:00 Brazil BR%sT 1990 Sep 17
626 -3:00 - BRT 1995 Oct 13
627 -3:00 Brazil BR%sT 1996 Sep 4
628 -3:00 - BRT 1999 Sep 30
629 -3:00 Brazil BR%sT 2000 Oct 22
630 -3:00 - BRT 2001 Sep 13
631 -3:00 Brazil BR%sT 2002 Oct 1
632 -3:00 - BRT
633 #
634 # Bahia (BA)
635 # There are too many Salvadors elsewhere, so use America/Bahia instead
636 # of America/Salvador.
637 Zone America/Bahia -2:34:04 - LMT 1914
638 -3:00 Brazil BR%sT 2003 Sep 24
639 -3:00 - BRT
640 #
641 # Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
642 # Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
643 # Santa Catarina (SC), Rio Grande do Sul (RS)
644 Zone America/Sao_Paulo -3:06:28 - LMT 1914
645 -3:00 Brazil BR%sT 1963 Oct 23 00:00
646 -3:00 1:00 BRST 1964
647 -3:00 Brazil BR%sT
648 #
649 # Mato Grosso do Sul (MS)
650 Zone America/Campo_Grande -3:38:28 - LMT 1914
651 -4:00 Brazil AM%sT
652 #
653 # Mato Grosso (MT)
654 Zone America/Cuiaba -3:44:20 - LMT 1914
655 -4:00 Brazil AM%sT 2003 Sep 24
656 -4:00 - AMT 2004 Oct 1
657 -4:00 Brazil AM%sT
658 #
659 # west Para (PA), Rondonia (RO)
660 # West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem.
661 Zone America/Porto_Velho -4:15:36 - LMT 1914
662 -4:00 Brazil AM%sT 1988 Sep 12
663 -4:00 - AMT
664 #
665 # Roraima (RR)
666 Zone America/Boa_Vista -4:02:40 - LMT 1914
667 -4:00 Brazil AM%sT 1988 Sep 12
668 -4:00 - AMT 1999 Sep 30
669 -4:00 Brazil AM%sT 2000 Oct 15
670 -4:00 - AMT
671 #
672 # east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto
673 # The great circle line from Tabatinga to Porto Acre divides
674 # east from west Amazonas.
675 Zone America/Manaus -4:00:04 - LMT 1914
676 -4:00 Brazil AM%sT 1988 Sep 12
677 -4:00 - AMT 1993 Sep 28
678 -4:00 Brazil AM%sT 1994 Sep 22
679 -4:00 - AMT
680 #
681 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
682 # Eirunepe, Envira, Ipixuna
683 Zone America/Eirunepe -4:39:28 - LMT 1914
684 -5:00 Brazil AC%sT 1988 Sep 12
685 -5:00 - ACT 1993 Sep 28
686 -5:00 Brazil AC%sT 1994 Sep 22
687 -5:00 - ACT
688 #
689 # Acre (AC)
690 Zone America/Rio_Branco -4:31:12 - LMT 1914
691 -5:00 Brazil AC%sT 1988 Sep 12
692 -5:00 - ACT
695 # Chile
697 # From Eduardo Krell (1995-10-19):
698 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
699 # of October.... The law is the same for March and October.
700 # (1998-09-29):
701 # Because of the drought this year, the government decided to go into
702 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
703 # (unless there's another dry season next year, I guess).
705 # From Julio I. Pacheco Troncoso (1999-03-18):
706 # Because of the same drought, the government decided to end DST later,
707 # on April 3, (one-time change).
709 # From Gwillim Law (2001-05-04):
710 # I came across another article in "La Tercera" about Chilean DST.
711 # <http://www.tercera.cl/diario/2000/10/13/t-extras.html>
712 # It clearly confirms my earlier suggestion, that DST begins at 22:00
713 # on Easter Island.... But it also seems to be saying that the
714 # observance of DST in Chile began in 1966, rather than 1969 as
715 # ... [Shanks] has it....
716 #
717 # My translation:
718 #
719 # "The Chilean Army has announced that summer time will begin tomorrow,
720 # Saturday, October 14 in continental Chile, insular Chile, and
721 # Antarctica, as provided by Supreme Decree 25 of January 11, 1966.
722 # By the preceding, official time in continental Chile and Chilean
723 # Antarctic, and official time in Western Insular Chile, which applies
724 # to Easter Island and Sala y Gomez Island, will be set forward at
725 # midnight and at 22:00, respectively, by 20 minutes."
727 # From Paul Eggert (2001-05-04):
728 # Go with this article in preference to Shanks's 1969 date for modern DST.
729 # Assume this rule has been used since DST was introduced in the islands.
731 # From Paul Eggert (2002-10-24):
732 # <http://www.shoa.cl/shoa/faqhoraoficial.htm> gives many details that
733 # disagree with the following table, but we haven't had time to compare them.
735 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
736 Rule Chile 1918 only - Sep 1 0:00 1:00 S
737 Rule Chile 1919 only - Jul 2 0:00 0 -
738 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
739 Rule Chile 1928 1932 - Apr 1 0:00 0 -
740 Rule Chile 1966 1997 - Oct Sun>=9 4:00u 1:00 S
741 Rule Chile 1967 1998 - Mar Sun>=9 3:00u 0 -
742 Rule Chile 1998 only - Sep 27 4:00u 1:00 S
743 Rule Chile 1999 only - Apr 4 3:00u 0 -
744 Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S
745 Rule Chile 2000 max - Mar Sun>=9 3:00u 0 -
746 # IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
747 # (1996-09) says 1998-03-08. Ignore these.
748 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
749 Zone America/Santiago -4:42:40 - LMT 1890
750 -4:42:40 - SMT 1910 # Santiago Mean Time
751 -5:00 Chile CL%sT 1932 Sep # Chile Time
752 -4:00 Chile CL%sT
753 Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
754 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
755 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
756 -6:00 Chile EAS%sT
757 #
758 # Sala y Gomez Island is like Pacific/Easter.
759 # Other Chilean locations, including Juan Fernandez Is, San Ambrosio,
760 # San Felix, and Antarctic bases, are like America/Santiago.
762 # Colombia
763 # Shanks specifies 24:00 for 1992 transition times; go with IATA,
764 # as it seems implausible to change clocks at midnight New Year's Eve.
765 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
766 Rule CO 1992 only - May 2 0:00 1:00 S
767 Rule CO 1992 only - Dec 31 0:00 0 -
768 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
769 Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
770 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
771 -5:00 CO CO%sT # Colombia Time
772 # Malpelo, Providencia, San Andres
773 # no information; probably like America/Bogota
775 # Curacao
776 # Shanks says that Bottom and Oranjestad have been at -4:00 since
777 # standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
778 # used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
779 # This all predates our 1970 cutoff, though.
780 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
781 Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
782 -4:30 - ANT 1965 # Netherlands Antilles Time
783 -4:00 - AST
785 # Ecuador
786 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
787 Zone America/Guayaquil -5:19:20 - LMT 1890
788 -5:14:00 - QMT 1931 # Quito Mean Time
789 -5:00 - ECT # Ecuador Time
790 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
791 -5:00 - ECT 1986
792 -6:00 - GALT # Galapagos Time
794 # Falklands
796 # From Paul Eggert (2001-03-05):
797 # Between 1990 and 2000 inclusive, Shanks and the IATA agree except
798 # the IATA gives 1996-09-08. Go with Shanks.
800 # From Falkland Islands Government Office, London (2001-01-22)
801 # via Jesper Norgaard:
802 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
803 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
804 # September. It is anticipated that the clocks will revert back at 2
805 # am on Sunday 21 April 2002 and advance to summer time at 2 am on
806 # Sunday 1 September.
808 # From Rives McDow (2001-02-13):
809 #
810 # I have communicated several times with people there, and the last
811 # time I had communications that was helpful was in 1998. Here is
812 # what was said then:
813 #
814 # "The general rule was that Stanley used daylight saving and the Camp
815 # did not. However for various reasons many people in the Camp have
816 # started to use daylight saving (known locally as 'Stanley Time')
817 # There is no rule as to who uses daylight saving - it is a matter of
818 # personal choice and so it is impossible to draw a map showing who
819 # uses it and who does not. Any list would be out of date as soon as
820 # it was produced. This year daylight saving ended on April 18/19th
821 # and started again on September 12/13th. I do not know what the rule
822 # is, but can find out if you like. We do not change at the same time
823 # as UK or Chile."
824 #
825 # I did have in my notes that the rule was "Second Saturday in Sep at
826 # 0:00 until third Saturday in Apr at 0:00". I think that this does
827 # not agree in some cases with Shanks; is this true?
828 #
829 # Also, there is no mention in the list that some areas in the
830 # Falklands do not use DST. I have found in my communications there
831 # that these areas are on the western half of East Falkland and all of
832 # West Falkland. Stanley is the only place that consistently observes
833 # DST. Again, as in other places in the world, the farmers don't like
834 # it. West Falkland is almost entirely sheep farmers.
835 #
836 # I know one lady there that keeps a list of which farm keeps DST and
837 # which doesn't each year. She runs a shop in Stanley, and says that
838 # the list changes each year. She uses it to communicate to her
839 # customers, catching them when they are home for lunch or dinner.
841 # From Paul Eggert (2001-03-05):
842 # For now, we'll just record the time in Stanley, since we have no
843 # better info.
845 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
846 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
847 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
848 Rule Falk 1939 only - Oct 1 0:00 1:00 S
849 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
850 Rule Falk 1943 only - Jan 1 0:00 0 -
851 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
852 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
853 Rule Falk 1984 only - Sep 16 0:00 1:00 S
854 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
855 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
856 Rule Falk 2001 max - Apr Sun>=15 2:00 0 -
857 Rule Falk 2001 max - Sep Sun>=1 2:00 1:00 S
858 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
859 Zone Atlantic/Stanley -3:51:24 - LMT 1890
860 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
861 -4:00 Falk FK%sT 1983 May # Falkland Is Time
862 -3:00 Falk FK%sT 1985 Sep 15
863 -4:00 Falk FK%sT
865 # French Guiana
866 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
867 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
868 -4:00 - GFT 1967 Oct # French Guiana Time
869 -3:00 - GFT
871 # Guyana
872 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
873 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
874 -3:45 - GBGT 1966 May 26 # Br Guiana Time
875 -3:45 - GYT 1975 Jul 31 # Guyana Time
876 -3:00 - GYT 1991
877 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
878 -4:00 - GYT
880 # Paraguay
881 # From Paul Eggert (1999-10-29):
882 # Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
883 # and autumn transitions are from 00:00 -> 23:00. Go with earlier
884 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
885 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
886 Rule Para 1975 1988 - Oct 1 0:00 1:00 S
887 Rule Para 1975 1978 - Mar 1 0:00 0 -
888 Rule Para 1979 1991 - Apr 1 0:00 0 -
889 Rule Para 1989 only - Oct 22 0:00 1:00 S
890 Rule Para 1990 only - Oct 1 0:00 1:00 S
891 Rule Para 1991 only - Oct 6 0:00 1:00 S
892 Rule Para 1992 only - Mar 1 0:00 0 -
893 Rule Para 1992 only - Oct 5 0:00 1:00 S
894 Rule Para 1993 only - Mar 31 0:00 0 -
895 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
896 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
897 Rule Para 1996 only - Mar 1 0:00 0 -
898 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
899 # From Steffen Thorsen (2000-10-02):
900 # I have three independent reports that Paraguay changed to DST this Sunday
901 # (10-01).
902 #
903 # Translated by Gwillim Law (2001-02-27) from
904 # <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm">
905 # Noticias, a daily paper in Asuncion, Paraguay (2000-10-01)
906 # </a>:
907 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
908 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
909 # system has been operating for several years. Formerly there was a separate
910 # decree each year; the new law has the same effect, but permanently. Every
911 # year, the time will change on the first Sunday of October; likewise, the
912 # clock will be set back on the first Sunday of March.
913 #
914 # From Jesper Norgaard (2001-03-06) [an official URL saying similar things]:
915 # http://gateway.abc.com.py:8000/pub/pag04.mbr/artic?FHA=2001-03-03-02.24.52.900592
916 #
917 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
918 # IATA SSIM (1997-09) says Mar 1; go with Shanks.
919 Rule Para 1997 only - Feb lastSun 0:00 0 -
920 # Shanks says 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
921 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
922 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
923 # From Rives McDow (2002-02-28):
924 # A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the
925 # dst method to be from the first Sunday in September to the first Sunday in
926 # April.
927 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
928 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
929 #
930 # From Jesper Norgaard Welen (2005-01-02):
931 # There are several sources that claim that Paraguay made
932 # a timezone rule change in autumn 2004.
933 # From Steffen Thorsen (2005-01-05):
934 # Decree 1,867 (2004-03-05) <http://www.labor.com.py/noticias.asp?id=27>
935 Rule Para 2004 max - Oct Sun>=15 0:00 1:00 S
936 Rule Para 2005 max - Mar Sun>=8 0:00 0 -
938 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
939 Zone America/Asuncion -3:50:40 - LMT 1890
940 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
941 -4:00 - PYT 1972 Oct # Paraguay Time
942 -3:00 - PYT 1974 Apr
943 -4:00 Para PY%sT
945 # Peru
946 #
947 # <a href="news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net">
948 # From Evelyn C. Leeper via Mark Brader (2003-10-26):</a>
949 # When we were in Peru in 1985-1986, they apparently switched over
950 # sometime between December 29 and January 3 while we were on the Amazon.
951 #
952 # From Paul Eggert (2003-11-02):
953 # Shanks doesn't have this transition. Assume 1986 was like 1987.
955 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
956 Rule Peru 1938 only - Jan 1 0:00 1:00 S
957 Rule Peru 1938 only - Apr 1 0:00 0 -
958 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
959 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
960 Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
961 Rule Peru 1986 1987 - Apr 1 0:00 0 -
962 Rule Peru 1990 only - Jan 1 0:00 1:00 S
963 Rule Peru 1990 only - Apr 1 0:00 0 -
964 # IATA is ambiguous for 1993/1995; go with Shanks.
965 Rule Peru 1994 only - Jan 1 0:00 1:00 S
966 Rule Peru 1994 only - Apr 1 0:00 0 -
967 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
968 Zone America/Lima -5:08:12 - LMT 1890
969 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
970 -5:00 Peru PE%sT # Peru Time
972 # South Georgia
973 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
974 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
975 -2:00 - GST # South Georgia Time
977 # South Sandwich Is
978 # uninhabited; scientific personnel have wintered
980 # Suriname
981 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
982 Zone America/Paramaribo -3:40:40 - LMT 1911
983 -3:40:52 - PMT 1935 # Paramaribo Mean Time
984 -3:40:36 - PMT 1945 Oct # The capital moved?
985 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
986 -3:30 - SRT 1984 Oct # Suriname Time
987 -3:00 - SRT
989 # Trinidad and Tobago
990 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
991 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
992 -4:00 - AST
994 # Uruguay
995 # From Paul Eggert (1993-11-18):
996 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
997 # From Shanks:
998 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
999 # Whitman gives 1923 Oct 1; go with Shanks.
1000 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1001 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1002 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1003 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1004 # Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
1005 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1006 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1007 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1008 # Whitman gives 1937 Oct 3; go with Shanks.
1009 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1010 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1011 # and 1943 Apr 13 ``to present time''; go with Shanks.
1012 Rule Uruguay 1941 only - Aug 1 0:00 0 -
1013 Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
1014 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1015 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1016 Rule Uruguay 1959 only - May 24 0:00 1:00 S
1017 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1018 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1019 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1020 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1021 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1022 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1023 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1024 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1025 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1026 Rule Uruguay 1972 only - Aug 15 0:00 0 -
1027 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1028 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1029 Rule Uruguay 1976 only - Oct 1 0:00 0 -
1030 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1031 Rule Uruguay 1978 only - Apr 1 0:00 0 -
1032 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1033 Rule Uruguay 1980 only - May 1 0:00 0 -
1034 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1035 Rule Uruguay 1988 only - Mar 14 0:00 0 -
1036 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1037 Rule Uruguay 1989 only - Mar 12 0:00 0 -
1038 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1039 # Shanks says no DST was observed in 1990/1 and 1991/2,
1040 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1041 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1042 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1043 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1044 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1045 # From Eduardo Cota (2004-09-20):
1046 # The uruguayan government has decreed a change in the local time....
1047 # http://www.presidencia.gub.uy/decretos/2004091502.htm
1048 Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1049 # From Steffen Thorsen (2005-03-11):
1050 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1051 # save energy ... it was postponed two weeks....
1052 # http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1053 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1054 # From Eduardo Cota (2005-09-27):
1055 # http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1056 # This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1057 # 02:00 local time, official time in Uruguay will be at GMT -2.
1058 Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1059 Rule Uruguay 2006 only - Mar 12 2:00 0 -
1060 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1061 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1062 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1063 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
1064 -3:00 Uruguay UY%sT
1066 # Venezuela
1067 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1068 Zone America/Caracas -4:27:44 - LMT 1890
1069 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1070 -4:30 - VET 1965 # Venezuela Time
1071 -4:00 - VET