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1# @(#)southamerica 7.55
1# @(#)southamerica 7.61
2
3# This data is by no means authoritative; if you think you know better,
4# go ahead and edit the file (and please send any changes to
5# tz@elsie.nci.nih.gov for general use in the future).
6
2
3# This data is by no means authoritative; if you think you know better,
4# go ahead and edit the file (and please send any changes to
5# tz@elsie.nci.nih.gov for general use in the future).
6
7# From Paul Eggert <eggert@twinsun.com> (1999-07-07):
7# From Paul Eggert (1999-07-07):
8# A good source for time zone historical data outside the U.S. is
9# Thomas G. Shanks, The International Atlas (5th edition),
10# San Diego: ACS Publications, Inc. (1999).
11#
12# Gwillim Law 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

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53
54# From Bob Devine (1988-01-28):
55# Argentina: first Sunday in October to first Sunday in April since 1976.
56# Double Summer time from 1969 to 1974. Switches at midnight.
57
58# From U. S. Naval Observatory (1988-01-199):
59# ARGENTINA 3 H BEHIND UTC
60
8# A good source for time zone historical data outside the U.S. is
9# Thomas G. Shanks, The International Atlas (5th edition),
10# San Diego: ACS Publications, Inc. (1999).
11#
12# Gwillim Law 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

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53
54# From Bob Devine (1988-01-28):
55# Argentina: first Sunday in October to first Sunday in April since 1976.
56# Double Summer time from 1969 to 1974. Switches at midnight.
57
58# From U. S. Naval Observatory (1988-01-199):
59# ARGENTINA 3 H BEHIND UTC
60
61# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
61# From Hernan G. Otero (1995-06-26):
62# I am sending modifications to the Argentine time zone table...
63# AR was chosen because they are the ISO letters that represent Argentina.
64
65# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
66Rule Arg 1930 only - Dec 1 0:00 1:00 S
67Rule Arg 1931 only - Apr 1 0:00 0 -
68Rule Arg 1931 only - Oct 15 0:00 1:00 S
69Rule Arg 1932 1940 - Mar 1 0:00 0 -

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81Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
82Rule Arg 1967 only - Apr 2 0:00 0 -
83Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
84Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
85Rule Arg 1974 only - Jan 23 0:00 1:00 S
86Rule Arg 1974 only - May 1 0:00 0 -
87Rule Arg 1988 only - Dec 1 0:00 1:00 S
88#
62# I am sending modifications to the Argentine time zone table...
63# AR was chosen because they are the ISO letters that represent Argentina.
64
65# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
66Rule Arg 1930 only - Dec 1 0:00 1:00 S
67Rule Arg 1931 only - Apr 1 0:00 0 -
68Rule Arg 1931 only - Oct 15 0:00 1:00 S
69Rule Arg 1932 1940 - Mar 1 0:00 0 -

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81Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
82Rule Arg 1967 only - Apr 2 0:00 0 -
83Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
84Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
85Rule Arg 1974 only - Jan 23 0:00 1:00 S
86Rule Arg 1974 only - May 1 0:00 0 -
87Rule Arg 1988 only - Dec 1 0:00 1:00 S
88#
89# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
89# From Hernan G. Otero (1995-06-26):
90# These corrections were contributed by InterSoft Argentina S.A.,
91# obtaining the data from the:
92# Talleres de Hidrografia Naval Argentina
93# (Argentine Naval Hydrography Institute)
94#
95# Shanks stops after 1992-03-01; go with Otero.
96Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
97Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
98#
90# These corrections were contributed by InterSoft Argentina S.A.,
91# obtaining the data from the:
92# Talleres de Hidrografia Naval Argentina
93# (Argentine Naval Hydrography Institute)
94#
95# Shanks stops after 1992-03-01; go with Otero.
96Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
97Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
98#
99# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
99# From Hernan G. Otero (1995-06-26):
100# From this moment on, the law that mandated the daylight saving
101# time corrections was derogated and no more modifications
102# to the time zones (for daylight saving) are now made.
103#
104# From Rives McDow (2000-01-10):
105# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
106# which did not result in the switch of a time zone, as they stayed 9 hours
107# from the International Date Line.
108Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
109Rule Arg 2000 only - Mar Sun>=1 0:00 0 -
110#
111# From Peter Gradelski via Steffen Thorsen (2000-03-01):
112# We just checked with our Sao Paulo office and they say the government of
113# Argentina decided not to become one of the countries that go on or off DST.
114# So Buenos Aires should be -3 hours from GMT at all times.
115#
100# From this moment on, the law that mandated the daylight saving
101# time corrections was derogated and no more modifications
102# to the time zones (for daylight saving) are now made.
103#
104# From Rives McDow (2000-01-10):
105# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
106# which did not result in the switch of a time zone, as they stayed 9 hours
107# from the International Date Line.
108Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
109Rule Arg 2000 only - Mar Sun>=1 0:00 0 -
110#
111# From Peter Gradelski via Steffen Thorsen (2000-03-01):
112# We just checked with our Sao Paulo office and they say the government of
113# Argentina decided not to become one of the countries that go on or off DST.
114# So Buenos Aires should be -3 hours from GMT at all times.
115#
116# From Fabian L. Arce Jofre <farcejofre@bigfoot.com> (2000-04-04):
116# From Fabian L. Arce Jofre (2000-04-04):
117# The law that claimed DST for Argentina was derogated by President Fernando
118# de la Rua on March 2, 2000, because it would make people spend more energy
119# in the winter time, rather than less. The change took effect on March 3.
120#
121# From Mariano Absatz (2001-06-06):
122# one of the major newspapers here in Argentina said that the 1999
123# Timezone Law (which never was effectively applied) will (would?) be
124# in effect.... The article is at

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288 -4:00 - WART 1990 Oct 28
289 -4:00 1:00 WARST 1991 Mar 17
290 -4:00 - WART 1991 Oct 6
291 -3:00 1:00 ARST 1992
292 -3:00 Arg AR%sT 1999 Oct 3
293 -4:00 Arg AR%sT 2000 Mar 3
294 -3:00 - ART
295#
117# The law that claimed DST for Argentina was derogated by President Fernando
118# de la Rua on March 2, 2000, because it would make people spend more energy
119# in the winter time, rather than less. The change took effect on March 3.
120#
121# From Mariano Absatz (2001-06-06):
122# one of the major newspapers here in Argentina said that the 1999
123# Timezone Law (which never was effectively applied) will (would?) be
124# in effect.... The article is at

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288 -4:00 - WART 1990 Oct 28
289 -4:00 1:00 WARST 1991 Mar 17
290 -4:00 - WART 1991 Oct 6
291 -3:00 1:00 ARST 1992
292 -3:00 Arg AR%sT 1999 Oct 3
293 -4:00 Arg AR%sT 2000 Mar 3
294 -3:00 - ART
295#
296# Catamarca (CT)
296# Catamarca (CT), Chubut (CH)
297Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
298 -4:16:48 - CMT 1920 May
299 -4:00 - ART 1930 Dec
300 -4:00 Arg AR%sT 1969 Oct 5
301 -3:00 Arg AR%sT 1991 Mar 3
302 -4:00 - WART 1991 Oct 20
303 -3:00 Arg AR%sT 1999 Oct 3
304 -4:00 Arg AR%sT 2000 Mar 3

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318 -4:00 1:00 WARST 1992 Mar 1
319 -4:00 - WART 1992 Oct 18
320 -3:00 Arg AR%sT 1999 Oct 3
321 -4:00 Arg AR%sT 2000 Mar 3
322 -3:00 - ART 2004 May 23
323 -4:00 - WART 2004 Sep 26
324 -3:00 - ART
325#
297Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
298 -4:16:48 - CMT 1920 May
299 -4:00 - ART 1930 Dec
300 -4:00 Arg AR%sT 1969 Oct 5
301 -3:00 Arg AR%sT 1991 Mar 3
302 -4:00 - WART 1991 Oct 20
303 -3:00 Arg AR%sT 1999 Oct 3
304 -4:00 Arg AR%sT 2000 Mar 3

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318 -4:00 1:00 WARST 1992 Mar 1
319 -4:00 - WART 1992 Oct 18
320 -3:00 Arg AR%sT 1999 Oct 3
321 -4:00 Arg AR%sT 2000 Mar 3
322 -3:00 - ART 2004 May 23
323 -4:00 - WART 2004 Sep 26
324 -3:00 - ART
325#
326# Chubut (CH)
327# The name "Comodoro Rivadavia" exceeds the 14-byte POSIX limit.
328Zone America/Argentina/ComodRivadavia -4:30:00 - LMT 1894 Oct 31
329 -4:16:48 - CMT 1920 May
330 -4:00 - ART 1930 Dec
331 -4:00 Arg AR%sT 1969 Oct 5
332 -3:00 Arg AR%sT 1991 Mar 3
333 -4:00 - WART 1991 Oct 20
334 -3:00 Arg AR%sT 1999 Oct 3
335 -4:00 Arg AR%sT 2000 Mar 3
336 -3:00 - ART 2004 Jun 1
337 -4:00 - WART 2004 Jun 20
338 -3:00 - ART
339#
340# Santa Cruz (SC)
341Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
342 -4:16:48 - CMT 1920 May # Cordoba Mean Time
343 -4:00 - ART 1930 Dec
344 -4:00 Arg AR%sT 1969 Oct 5
345 -3:00 Arg AR%sT 1999 Oct 3
346 -4:00 Arg AR%sT 2000 Mar 3
347 -3:00 - ART 2004 Jun 1

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369# Zone NAME GMTOFF RULES FORMAT [UNTIL]
370Zone America/La_Paz -4:32:36 - LMT 1890
371 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
372 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
373 -4:00 - BOT # Bolivia Time
374
375# Brazil
376
326# Santa Cruz (SC)
327Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
328 -4:16:48 - CMT 1920 May # Cordoba Mean Time
329 -4:00 - ART 1930 Dec
330 -4:00 Arg AR%sT 1969 Oct 5
331 -3:00 Arg AR%sT 1999 Oct 3
332 -4:00 Arg AR%sT 2000 Mar 3
333 -3:00 - ART 2004 Jun 1

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355# Zone NAME GMTOFF RULES FORMAT [UNTIL]
356Zone America/La_Paz -4:32:36 - LMT 1890
357 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
358 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
359 -4:00 - BOT # Bolivia Time
360
361# Brazil
362
377# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
363# From Paul Eggert (1993-11-18):
378# The mayor of Rio recently attempted to change the time zone rules
379# just in his city, in order to leave more summer time for the tourist trade.
380# The rule change lasted only part of the day;
381# the federal government refused to follow the city's rules, and business
382# was in a chaos, so the mayor backed down that afternoon.
383
384# From IATA SSIM (1996-02):
385# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),

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527# adds AL, SE.
528Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
529Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
530Rule Brazil 1996 only - Feb 11 0:00 0 -
531# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
532# adopted by same states, minus AL, SE.
533Rule Brazil 1996 only - Oct 6 0:00 1:00 S
534Rule Brazil 1997 only - Feb 16 0:00 0 -
364# The mayor of Rio recently attempted to change the time zone rules
365# just in his city, in order to leave more summer time for the tourist trade.
366# The rule change lasted only part of the day;
367# the federal government refused to follow the city's rules, and business
368# was in a chaos, so the mayor backed down that afternoon.
369
370# From IATA SSIM (1996-02):
371# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),

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513# adds AL, SE.
514Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
515Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
516Rule Brazil 1996 only - Feb 11 0:00 0 -
517# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
518# adopted by same states, minus AL, SE.
519Rule Brazil 1996 only - Oct 6 0:00 1:00 S
520Rule Brazil 1997 only - Feb 16 0:00 0 -
535# From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12):
521# From Daniel C. Sobral (1998-02-12):
536# In 1997, the DS began on October 6. The stated reason was that
537# because international television networks ignored Brazil's policy on DS,
538# they bought the wrong times on satellite for coverage of Pope's visit.
539# This year, the ending date of DS was postponed to March 1
540# to help dealing with the shortages of electric power.
541#
542# From Paul Eggert (1998-02-25):
543# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm">

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937Rule Para 1997 only - Feb lastSun 0:00 0 -
938# Shanks says 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
939# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
940Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
941# From Rives McDow (2002-02-28):
942# A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the
943# dst method to be from the first Sunday in September to the first Sunday in
944# April.
522# In 1997, the DS began on October 6. The stated reason was that
523# because international television networks ignored Brazil's policy on DS,
524# they bought the wrong times on satellite for coverage of Pope's visit.
525# This year, the ending date of DS was postponed to March 1
526# to help dealing with the shortages of electric power.
527#
528# From Paul Eggert (1998-02-25):
529# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm">

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923Rule Para 1997 only - Feb lastSun 0:00 0 -
924# Shanks says 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
925# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
926Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
927# From Rives McDow (2002-02-28):
928# A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the
929# dst method to be from the first Sunday in September to the first Sunday in
930# April.
945Rule Para 2002 max - Apr Sun>=1 0:00 0 -
946Rule Para 2002 max - Sep Sun>=1 0:00 1:00 S
931Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
932Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
933#
934# From Jesper Norgaard Welen (2005-01-02):
935# There are several sources that claim that Paraguay made
936# a timezone rule change in autumn 2004.
937# From Steffen Thorsen (2005-01-05):
938# Decree 1,867 (2004-03-05) <http://www.labor.com.py/noticias.asp?id=27>
939Rule Para 2004 max - Oct Sun>=15 0:00 1:00 S
940Rule Para 2005 max - Mar Sun>=8 0:00 0 -
947
941
948
949# Zone NAME GMTOFF RULES FORMAT [UNTIL]
950Zone America/Asuncion -3:50:40 - LMT 1890
951 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
952 -4:00 - PYT 1972 Oct # Paraguay Time
953 -3:00 - PYT 1974 Apr
954 -4:00 Para PY%sT
955
956# Peru
957#
958# <a href="news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net">
959# From Evelyn C. Leeper via Mark Brader (2003-10-26):</a>
942# Zone NAME GMTOFF RULES FORMAT [UNTIL]
943Zone America/Asuncion -3:50:40 - LMT 1890
944 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
945 -4:00 - PYT 1972 Oct # Paraguay Time
946 -3:00 - PYT 1974 Apr
947 -4:00 Para PY%sT
948
949# Peru
950#
951# <a href="news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net">
952# From Evelyn C. Leeper via Mark Brader (2003-10-26):</a>
960# When we were in Peru in 1985-1986, they apparently switched over
953# When we were in Peru in 1985-1986, they apparently switched over
961# sometime between December 29 and January 3 while we were on the Amazon.
962#
963# From Paul Eggert (2003-11-02):
964# Shanks doesn't have this transition. Assume 1986 was like 1987.
965
966# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
967Rule Peru 1938 only - Jan 1 0:00 1:00 S
968Rule Peru 1938 only - Apr 1 0:00 0 -

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998 -3:00 - SRT
999
1000# Trinidad and Tobago
1001# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1002Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
1003 -4:00 - AST
1004
1005# Uruguay
954# sometime between December 29 and January 3 while we were on the Amazon.
955#
956# From Paul Eggert (2003-11-02):
957# Shanks doesn't have this transition. Assume 1986 was like 1987.
958
959# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
960Rule Peru 1938 only - Jan 1 0:00 1:00 S
961Rule Peru 1938 only - Apr 1 0:00 0 -

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991 -3:00 - SRT
992
993# Trinidad and Tobago
994# Zone NAME GMTOFF RULES FORMAT [UNTIL]
995Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
996 -4:00 - AST
997
998# Uruguay
1006# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
999# From Paul Eggert (1993-11-18):
1007# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1008# From Shanks:
1009# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1010# Whitman gives 1923 Oct 1; go with Shanks.
1011Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1012Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1013Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1014Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS

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1051# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1052Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1053Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1054Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1055Rule Uruguay 1993 only - Feb 28 0:00 0 -
1056# From Eduardo Cota (2004-09-20):
1057# The uruguayan government has decreed a change in the local time....
1058# http://www.presidencia.gub.uy/decretos/2004091502.htm
1000# Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1001# From Shanks:
1002# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1003# Whitman gives 1923 Oct 1; go with Shanks.
1004Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1005Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1006Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1007Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS

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1044# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1045Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1046Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1047Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1048Rule Uruguay 1993 only - Feb 28 0:00 0 -
1049# From Eduardo Cota (2004-09-20):
1050# The uruguayan government has decreed a change in the local time....
1051# http://www.presidencia.gub.uy/decretos/2004091502.htm
1059Rule Uruguay 2004 only - Sep Sun>=15 0:00 1:00 S
1060Rule Uruguay 2005 only - Mar Sun>=8 0:00 0 -
1052Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1053# From Steffen Thorsen (2005-03-11):
1054# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1055# save energy ... it was postponed two weeks....
1056# http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1057Rule Uruguay 2005 only - Mar 27 2:00 0 -
1061# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1062Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1063 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1064 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
1065 -3:00 Uruguay UY%sT
1066
1067# Venezuela
1068# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1069Zone America/Caracas -4:27:44 - LMT 1890
1070 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1071 -4:30 - VET 1965 # Venezuela Time
1072 -4:00 - VET
1058# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1059Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1060 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1061 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
1062 -3:00 Uruguay UY%sT
1063
1064# Venezuela
1065# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1066Zone America/Caracas -4:27:44 - LMT 1890
1067 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1068 -4:30 - VET 1965 # Venezuela Time
1069 -4:00 - VET