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-rw-r--r--share/zoneinfo/northamerica92
1 files changed, 43 insertions, 49 deletions
diff --git a/share/zoneinfo/northamerica b/share/zoneinfo/northamerica
index 845587fa8205..654450a9c57e 100644
--- a/share/zoneinfo/northamerica
+++ b/share/zoneinfo/northamerica
@@ -1,4 +1,4 @@
-# @(#)northamerica 7.51
+# @(#)northamerica 7.52
# also includes Central America and the Caribbean
# This data is by no means authoritative; if you think you know better,
@@ -1002,52 +1002,35 @@ Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
# Mexico
-# From Guy Harris:
-# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
-# Rules [before] 1987 are unknown.
-# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
-# observe DST." This is presumably Baja California Norte, above 28th parallel,
-# as listed there; [there is also] "Baja California Sur and N. Pacific
-# Coast (States of Sinaloa and Sonora)."
-
-# From Bob Devine (1988-01-28):
-# The Federal District (where Mexico City is) has observed [DST] several
-# times but not recently.
+# Gwillim Law reports this source for daylight saving time in Mexico:
+# <a href="http://www.spin.com.mx/verano/">
+# Daylight saving time * SPIN-Internet (in Spanish)
+# </a>
+# Law (2000-03-09) translates it as follows:
#
-# I don't where to draw the line in the North Baja area. 28th latitude
-# sounds good -- but it may be higher (how far [d]o radio stations from
-# San Diego affect culture?).
+# Standard time effective in Mexico takes its origin in the
+# presidential decree of April 24, 1942. The time of the 120th
+# meridian applies to the state of Baja California; of the 105th
+# meridian to the states of Baja California Sur, Sonora, Sinaloa, and
+# Nayarit; and the time of the 90th meridian to the rest of the
+# country.
#
-# The dates of DST probably go back to 1981. The rules are the same as
-# US's. This is going to be a headache for US presidential electi[o]n years!
-
-# From Arthur David Olson (1988-02-13)
-# Since the 1981 starting date is only "probable," we'll keep the 1987
-# starting date below.
-
-# From U. S. Naval Observatory (1989-01-19):
-# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
-# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
-# MEXICO BAJA CAL N OF SINALOA AND SONORA)
-# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
-# MEXICO BAJA CAL N - OCT 29
-# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
-# MEXICO BAJA CAL N - 0CT 29
-# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
-# MEXICO COAHUILA, NUEVO LEON,
-# MEXICO TAMAULIPAS
-# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
-# MEXICO COAHUILA, NUEVO LEON,
-# MEXICO TAMAULIPAS APR 3 - OCT 29
-# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
-# MEXICO CAMPECHE, QUINTANA ROO AND
-# MEXICO YUCATAN
+# In the country, there have been several attempts made to adapt
+# standard time with the object of arriving at a better use of
+# daylight for social and economic activities. In December, 1981 a
+# permanent time zone was decreed for the states of Campeche, Yucatan,
+# and Quintana Roo, displacing them from the 90th to the 75th
+# meridian. This disposition was annulled on December 2, 1982.
+#
+# In 1988 a Summer Time was established for the states of Tamaulipas,
+# Nuevo Leon, Coahuila, and Durango, which meant that from the first
+# Sunday in April to the last [Sunday] of October those states
+# displaced their time from the 90th to the 75th meridian. That
+# disposition lasted for one year.
-# From Arthur David Olson (1989-01-21):
-# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
-# USNO claims there should be four Mexican zones rather than three:
-# a zone that's GMT-8 with DST; a zone that's always GMT-7;
-# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
+# From Paul Eggert (2000-07-26):
+# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981
+# and 1988 DST experiments. Go with spin.com.mx.
# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
# A guy from our Mexico subsidiary finally found the Presidential Decree
@@ -1093,7 +1076,6 @@ Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
# savings time so as to stay on the same time zone as the southern part of
# Arizona year round.
-# From Shanks:
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Mexico 1939 only - Feb 5 0:00 1:00 D
Rule Mexico 1939 only - Jun 25 0:00 0 S
@@ -1111,10 +1093,22 @@ Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
# Quintana Roo
Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
+ -6:00 - CST 1981 Dec
+ -5:00 - EST 1982 Dec 2
-6:00 - CST 1996
-6:00 Mexico C%sT 1997 Oct lastSun 2:00
-5:00 Mexico E%sT 1998 Aug 2 2:00
-6:00 Mexico C%sT
+# Campeche, Yucatan
+Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
+ -6:00 - CST 1981 Dec
+ -5:00 - EST 1982 Dec 2
+ -6:00 Mexico C%sT
+# Coahuila, Durango, Nuevo Leon, Tamaulipas
+Zone America/Monterrey -6:41:16 - LMT 1922 Jan 1 0:01:32
+ -6:00 - CST 1988
+ -6:00 US C%sT 1989
+ -6:00 Mexico C%sT
# Central Mexico
Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
-7:00 - MST 1927 Jun 10 23:00
@@ -1141,19 +1135,19 @@ Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
-7:00 - MST 1931 May 1 23:00
-6:00 - CST 1931 Oct
-7:00 - MST 1932 Mar 30 23:00
- -6:00 - CST 1942 Apr
+ -6:00 - CST 1942 Apr 24
-7:00 - MST 1949 Jan 14
-8:00 - PST 1970
-7:00 Mexico M%sT 1999
-7:00 - MST
-# S Baja California, Nayarit, Sinaloa
+# Baja California Sur, Nayarit, Sinaloa
Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
-7:00 - MST 1927 Jun 10 23:00
-6:00 - CST 1930 Nov 15
-7:00 - MST 1931 May 1 23:00
-6:00 - CST 1931 Oct
-7:00 - MST 1932 Mar 30 23:00
- -6:00 - CST 1942 Apr
+ -6:00 - CST 1942 Apr 24
-7:00 - MST 1949 Jan 14
-8:00 - PST 1970
-7:00 Mexico M%sT
@@ -1161,7 +1155,7 @@ Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
-8:00 - PST 1927 Jun 10 23:00
-7:00 - MST 1930 Nov 16
- -8:00 - PST 1942 Apr
+ -8:00 - PST 1942 Apr 24
-7:00 - MST 1949 Jan 14
-8:00 BajaN P%sT 1976
-8:00 US P%sT 1996