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1# @(#)northamerica 7.51
2# $FreeBSD: head/share/zoneinfo/northamerica 58787 2000-03-29 14:01:46Z ru $
1# @(#)northamerica 7.52
3# also includes Central America and the Caribbean
4
2# also includes Central America and the Caribbean
3
4# $FreeBSD: head/share/zoneinfo/northamerica 64499 2000-08-10 19:36:46Z wollman $
5
5# This data is by no means authoritative; if you think you know better,
6# go ahead and edit the file (and please send any changes to
7# tz@elsie.nci.nih.gov for general use in the future).
8
9# From Paul Eggert <eggert@twinsun.com> (1999-03-22):
10# A reliable and entertaining source about time zones is
11# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
12

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998 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
999 -8:00 NT_YK P%sT
1000
1001
1002###############################################################################
1003
1004# Mexico
1005
6# This data is by no means authoritative; if you think you know better,
7# go ahead and edit the file (and please send any changes to
8# tz@elsie.nci.nih.gov for general use in the future).
9
10# From Paul Eggert <eggert@twinsun.com> (1999-03-22):
11# A reliable and entertaining source about time zones is
12# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
13

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999 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
1000 -8:00 NT_YK P%sT
1001
1002
1003###############################################################################
1004
1005# Mexico
1006
1006# From Guy Harris:
1007# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
1008# Rules [before] 1987 are unknown.
1009# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
1010# observe DST." This is presumably Baja California Norte, above 28th parallel,
1011# as listed there; [there is also] "Baja California Sur and N. Pacific
1012# Coast (States of Sinaloa and Sonora)."
1013
1014# From Bob Devine (1988-01-28):
1015# The Federal District (where Mexico City is) has observed [DST] several
1016# times but not recently.
1007# Gwillim Law reports this source for daylight saving time in Mexico:
1008# <a href="http://www.spin.com.mx/verano/">
1009# Daylight saving time * SPIN-Internet (in Spanish)
1010# </a>
1011# Law (2000-03-09) translates it as follows:
1017#
1012#
1018# I don't where to draw the line in the North Baja area. 28th latitude
1019# sounds good -- but it may be higher (how far [d]o radio stations from
1020# San Diego affect culture?).
1013# Standard time effective in Mexico takes its origin in the
1014# presidential decree of April 24, 1942. The time of the 120th
1015# meridian applies to the state of Baja California; of the 105th
1016# meridian to the states of Baja California Sur, Sonora, Sinaloa, and
1017# Nayarit; and the time of the 90th meridian to the rest of the
1018# country.
1021#
1019#
1022# The dates of DST probably go back to 1981. The rules are the same as
1023# US's. This is going to be a headache for US presidential electi[o]n years!
1020# In the country, there have been several attempts made to adapt
1021# standard time with the object of arriving at a better use of
1022# daylight for social and economic activities. In December, 1981 a
1023# permanent time zone was decreed for the states of Campeche, Yucatan,
1024# and Quintana Roo, displacing them from the 90th to the 75th
1025# meridian. This disposition was annulled on December 2, 1982.
1026#
1027# In 1988 a Summer Time was established for the states of Tamaulipas,
1028# Nuevo Leon, Coahuila, and Durango, which meant that from the first
1029# Sunday in April to the last [Sunday] of October those states
1030# displaced their time from the 90th to the 75th meridian. That
1031# disposition lasted for one year.
1024
1032
1025# From Arthur David Olson (1988-02-13)
1026# Since the 1981 starting date is only "probable," we'll keep the 1987
1027# starting date below.
1033# From Paul Eggert (2000-07-26):
1034# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981
1035# and 1988 DST experiments. Go with spin.com.mx.
1028
1036
1029# From U. S. Naval Observatory (1989-01-19):
1030# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
1031# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
1032# MEXICO BAJA CAL N OF SINALOA AND SONORA)
1033# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
1034# MEXICO BAJA CAL N - OCT 29
1035# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
1036# MEXICO BAJA CAL N - 0CT 29
1037# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
1038# MEXICO COAHUILA, NUEVO LEON,
1039# MEXICO TAMAULIPAS
1040# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
1041# MEXICO COAHUILA, NUEVO LEON,
1042# MEXICO TAMAULIPAS APR 3 - OCT 29
1043# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
1044# MEXICO CAMPECHE, QUINTANA ROO AND
1045# MEXICO YUCATAN
1046
1047# From Arthur David Olson (1989-01-21):
1048# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
1049# USNO claims there should be four Mexican zones rather than three:
1050# a zone that's GMT-8 with DST; a zone that's always GMT-7;
1051# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
1052
1053# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1054# A guy from our Mexico subsidiary finally found the Presidential Decree
1055# outlining the timezone changes in Mexico.
1056#
1057# ------------- Begin Forwarded Message -------------
1058#
1059# I finally got my hands on the Official Presidential Decree that sets up the
1060# rules for the DST changes. The rules are:

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1089# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1090
1091# From Rives McDow (2000-01-10):
1092# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1093# zone 5 hours from the International Date Line, and will not observe daylight
1094# savings time so as to stay on the same time zone as the southern part of
1095# Arizona year round.
1096
1037# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1038# A guy from our Mexico subsidiary finally found the Presidential Decree
1039# outlining the timezone changes in Mexico.
1040#
1041# ------------- Begin Forwarded Message -------------
1042#
1043# I finally got my hands on the Official Presidential Decree that sets up the
1044# rules for the DST changes. The rules are:

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1073# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1074
1075# From Rives McDow (2000-01-10):
1076# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1077# zone 5 hours from the International Date Line, and will not observe daylight
1078# savings time so as to stay on the same time zone as the southern part of
1079# Arizona year round.
1080
1097# From Shanks:
1098# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1099Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1100Rule Mexico 1939 only - Jun 25 0:00 0 S
1101Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1102Rule Mexico 1941 only - Apr 1 0:00 0 S
1103Rule Mexico 1943 only - Dec 16 0:00 1:00 D
1104Rule Mexico 1944 only - May 1 0:00 0 S
1105Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1106Rule Mexico 1950 only - Jul 30 0:00 0 S
1107Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
1108Rule Mexico 1996 max - Oct lastSun 2:00 0 S
1109#
1110Rule BajaN 1954 1961 - Apr lastSun 2:00 1:00 D
1111Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S
1112# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1113# Quintana Roo
1114Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1081# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1082Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1083Rule Mexico 1939 only - Jun 25 0:00 0 S
1084Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1085Rule Mexico 1941 only - Apr 1 0:00 0 S
1086Rule Mexico 1943 only - Dec 16 0:00 1:00 D
1087Rule Mexico 1944 only - May 1 0:00 0 S
1088Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1089Rule Mexico 1950 only - Jul 30 0:00 0 S
1090Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
1091Rule Mexico 1996 max - Oct lastSun 2:00 0 S
1092#
1093Rule BajaN 1954 1961 - Apr lastSun 2:00 1:00 D
1094Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S
1095# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1096# Quintana Roo
1097Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1098 -6:00 - CST 1981 Dec
1099 -5:00 - EST 1982 Dec 2
1115 -6:00 - CST 1996
1116 -6:00 Mexico C%sT 1997 Oct lastSun 2:00
1117 -5:00 Mexico E%sT 1998 Aug 2 2:00
1118 -6:00 Mexico C%sT
1100 -6:00 - CST 1996
1101 -6:00 Mexico C%sT 1997 Oct lastSun 2:00
1102 -5:00 Mexico E%sT 1998 Aug 2 2:00
1103 -6:00 Mexico C%sT
1104# Campeche, Yucatan
1105Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
1106 -6:00 - CST 1981 Dec
1107 -5:00 - EST 1982 Dec 2
1108 -6:00 Mexico C%sT
1109# Coahuila, Durango, Nuevo Leon, Tamaulipas
1110Zone America/Monterrey -6:41:16 - LMT 1922 Jan 1 0:01:32
1111 -6:00 - CST 1988
1112 -6:00 US C%sT 1989
1113 -6:00 Mexico C%sT
1119# Central Mexico
1120Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1121 -7:00 - MST 1927 Jun 10 23:00
1122 -6:00 - CST 1930 Nov 15
1123 -7:00 - MST 1931 May 1 23:00
1124 -6:00 - CST 1931 Oct
1125 -7:00 - MST 1932 Mar 30 23:00
1126 -6:00 Mexico C%sT

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1137 -7:00 Mexico M%sT
1138# Sonora
1139Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1140 -7:00 - MST 1927 Jun 10 23:00
1141 -6:00 - CST 1930 Nov 15
1142 -7:00 - MST 1931 May 1 23:00
1143 -6:00 - CST 1931 Oct
1144 -7:00 - MST 1932 Mar 30 23:00
1114# Central Mexico
1115Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1116 -7:00 - MST 1927 Jun 10 23:00
1117 -6:00 - CST 1930 Nov 15
1118 -7:00 - MST 1931 May 1 23:00
1119 -6:00 - CST 1931 Oct
1120 -7:00 - MST 1932 Mar 30 23:00
1121 -6:00 Mexico C%sT

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1132 -7:00 Mexico M%sT
1133# Sonora
1134Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1135 -7:00 - MST 1927 Jun 10 23:00
1136 -6:00 - CST 1930 Nov 15
1137 -7:00 - MST 1931 May 1 23:00
1138 -6:00 - CST 1931 Oct
1139 -7:00 - MST 1932 Mar 30 23:00
1145 -6:00 - CST 1942 Apr
1140 -6:00 - CST 1942 Apr 24
1146 -7:00 - MST 1949 Jan 14
1147 -8:00 - PST 1970
1148 -7:00 Mexico M%sT 1999
1149 -7:00 - MST
1141 -7:00 - MST 1949 Jan 14
1142 -8:00 - PST 1970
1143 -7:00 Mexico M%sT 1999
1144 -7:00 - MST
1150# S Baja California, Nayarit, Sinaloa
1145# Baja California Sur, Nayarit, Sinaloa
1151Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1152 -7:00 - MST 1927 Jun 10 23:00
1153 -6:00 - CST 1930 Nov 15
1154 -7:00 - MST 1931 May 1 23:00
1155 -6:00 - CST 1931 Oct
1156 -7:00 - MST 1932 Mar 30 23:00
1146Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1147 -7:00 - MST 1927 Jun 10 23:00
1148 -6:00 - CST 1930 Nov 15
1149 -7:00 - MST 1931 May 1 23:00
1150 -6:00 - CST 1931 Oct
1151 -7:00 - MST 1932 Mar 30 23:00
1157 -6:00 - CST 1942 Apr
1152 -6:00 - CST 1942 Apr 24
1158 -7:00 - MST 1949 Jan 14
1159 -8:00 - PST 1970
1160 -7:00 Mexico M%sT
1161# Baja California
1162Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1163 -8:00 - PST 1927 Jun 10 23:00
1164 -7:00 - MST 1930 Nov 16
1153 -7:00 - MST 1949 Jan 14
1154 -8:00 - PST 1970
1155 -7:00 Mexico M%sT
1156# Baja California
1157Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1158 -8:00 - PST 1927 Jun 10 23:00
1159 -7:00 - MST 1930 Nov 16
1165 -8:00 - PST 1942 Apr
1160 -8:00 - PST 1942 Apr 24
1166 -7:00 - MST 1949 Jan 14
1167 -8:00 BajaN P%sT 1976
1168 -8:00 US P%sT 1996
1169 -8:00 Mexico P%sT
1170#
1171# Revillagigedo Is
1172# no information
1173

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1162 -8:00 BajaN P%sT 1976
1163 -8:00 US P%sT 1996
1164 -8:00 Mexico P%sT
1165#
1166# Revillagigedo Is
1167# no information
1168

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