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57aefafe56
glibc/time/northamerica
Roland McGrath 57aefafe56 * sysdeps/unix/Makefile ($(common-objpfx)ioctls): Remove NULL from 
the list.

	* time/northamerica: Corrections to Canada data from ADO 95i.

	* sysdeps/unix/sysv/linux/Makefile (headers): Don't append to this
	unconditionally.  In socket subdir, append sys/socketcall.h; in
	time subdir, append sys/timex.h.
	(config-LDFLAGS): New variable.
	* sysdeps/unix/sysv/linux/Dist: New file.
	* Makeconfig (+link): Pass $(config-LDFLAGS) before $(LDFLAGS).
1995-10-04 21:52:33 +00:00

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# @(#)northamerica 7.17
# also includes Central America and the Caribbean
# This data is by no means authoritative; if you think you know better,
# go ahead and edit the file (and please send any changes to
# tz@elsie.nci.nih.gov for general use in the future).
# From Paul Eggert <eggert@twinsun.com> (August 17, 1994):
# A reliable and entertaining source about time zones is
# Derek Howse, Greenwich time and the discovery of the longitude,
# Oxford University Press (1980).
###############################################################################
# United States
# From Arthur David Olson:
# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
# See, for example, the front page of the Saturday, October 26, 1974
# and Sunday, October 27, 1974 editions of the Washington Post.
# From seismo!munnari!kre:
# I recall also being told by someone once that Canada didn't have
# the DST variations in 74/75 that the US did, but I am not nearly
# sure enough of this to add anything.
# From Arthur David Olson:
# The above has been confirmed by Bob Devine; we'll go with it here.
# From Arthur David Olson:
# Before the Uniform Time Act of 1966 took effect in 1967, observance of
# Daylight Saving Time in the US was by local option, except during wartime.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
Rule US 1918 1919 - Oct lastSun 2:00 0 S
Rule US 1942 only - Feb 9 2:00 1:00 W # War
Rule US 1945 only - Sep 30 2:00 0 S
Rule US 1967 max - Oct lastSun 2:00 0 S
Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
Rule US 1974 only - Jan 6 2:00 1:00 D
Rule US 1975 only - Feb 23 2:00 1:00 D
Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
# From Bob Devine (January 28, 1988):
# ...Alaska (and Hawaii) had the timezone names changed in 1967.
# old new
# Pacific Standard Time(PST) -same-
# Yukon Standard Time(YST) -same-
# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
# Nome Standard Time (NT) Bering Standard Time (BST)
#
# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
# The YST zone now covers nearly all of the state, AHST just part
# of the Aleutian islands. No DST.
# From U. S. Naval Observatory (January 19, 1989):
# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
# USA MOUNTAIN 7 H BEHIND UTC DENVER
# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
# USA HAWAII 10 H BEHIND UTC
# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
# From Arthur David Olson (January 21, 1989):
# The above dates are for 1988.
# Note the "AKST" and "AKDT" abbreviations, the claim that there's
# no DST in Samoa, and the claim that there is DST in Alaska and the
# Aleutians.
# From Arthur David Olson (February 13, 1988):
# Legal standard time zone names, from United States Code (1982 Edition and
# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966
# took effect), as explained in sections 263 and 261:
# (none)
# United States standard eastern time
# United States standard mountain time
# United States standard central time
# United States standard Pacific time
# (none)
# United States standard Alaska time
# (none)
# Next, names from April 1, 1967 until November 30, 1983 (the date for
# public law 98-181):
# Atlantic standard time
# eastern standard time
# central standard time
# mountain standard time
# Pacific standard time
# Yukon standard time
# Alaska-Hawaii standard time
# Bering standard time
# And after November 30, 1983:
# Atlantic standard time
# eastern standard time
# central standard time
# mountain standard time
# Pacific standard time
# Alaska standard time
# Hawaii-Aleutian standard time
# Samoa standard time
# The law doesn't give abbreviations.
# From Paul Eggert <eggert@twinsun.com> (August 16, 1994):
# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it
# from Russia. We don't have this data pinned down yet, though.
# Easy stuff first--including Alaska, where we ignore history (since we
# can't tell if we should give Yukon time or Alaska-Hawaii time for "old"
# times).
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/New_York -5:00 US E%sT
Zone America/Chicago -6:00 US C%sT
Zone America/Denver -7:00 US M%sT
Zone America/Los_Angeles -8:00 US P%sT
Zone America/Anchorage -9:00 US AK%sT
# AK%sT is the abbreviation per USNO
# Mainland US areas that are always Standard as of 1986.
Zone America/Fort_Wayne -5:00 US E%sT 1946
-5:00 - EST # Always EST as of 1986
# From Arthur David Olson (October 28, 1991):
# An article on page A3 of the Sunday, October 27, 1991 Washington Post
# notes that Starke County switched from Central time to Eastern time as of
# October 27, 1991.
Zone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00
-5:00 - EST # Always EST as of 1991
Zone America/Phoenix -7:00 US M%sT 1946
-7:00 - MST # Always MST as of 1986
# From Arthur David Olson (February 13, 1988):
# However. . .a writer from the Inter Tribal Council of Arizona, Inc.,
# notes in private correspondence dated 12/28/87 that "Presently, only the
# Navajo Nation participates in the Daylight Saving Time policy, due to its
# large size and location in three states." (The "only" means that other
# tribal nations don't use DST.)
Link America/Denver America/Shiprock
# From Bob Devine (January 28, 1988):
# Michigan didn't observe DST from 1968 to 1973.
Zone America/Detroit -5:00 US E%sT 1968
-5:00 - EST 1973
-5:00 US E%sT
# Samoa just changes names. No DST, per Naval Observatory.
#
# Howse writes that in 1879 the King of Samoa decided to change
# ``the date in his kingdom from the Antipodean to the American system,
# ordaining -- by a masterpiece of diplomatic flattery -- that
# the Fourth of July should be celebrated twice in that year.''
Zone Pacific/Samoa 12:37:12 - LMT 1879 Jul 5
-11:22:48 - LMT 1911
-11:30 - SST 1950
-11:00 - NST 1967 Apr # N=Nome
-11:00 - BST 1983 Nov 30 # B=Bering
-11:00 - SST # S=Samoa
Zone Pacific/Midway -11:49:28 - LMT 1901
-11:00 - NST 1967 Apr # N=Nome
-11:00 - BST 1983 Nov 30 # B=Bering
-11:00 - SST # S=Samoa
# Aleutian has a name change. DST, per Naval Observatory.
Zone America/Atka -10:00 US AH%sT 1983 Nov 30
-10:00 US HA%sT
# From Arthur David Olson:
# And then there's Hawaii.
# DST was observed for one day in 1933;
# Standard time was change by half an hour in 1947;
# it's always standard as of 1986.
Zone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00
-10:30 1:00 HDT 1933 May 1 2:00
-10:30 US H%sT 1947 Jun 8 2:00
-10:00 - HST
# Navassa
# no information; probably like America/New_York
# Old names, for S5 users
# Link LINK-FROM LINK-TO
Link America/New_York EST5EDT
Link America/Chicago CST6CDT
Link America/Denver MST7MDT
Link America/Los_Angeles PST8PDT
Link America/Fort_Wayne EST
Link America/Phoenix MST
Link Pacific/Honolulu HST
################################################################################
# From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
# A good source for time zone historical data outside the U.S. is
# Thomas G. Shanks, The International Atlas (3rd edition),
# San Diego: ACS Publications, Inc. (1991).
# Except where otherwise noted, it is the source for the data below.
#
# Another source occasionally used is Edward W. Whitman, World Time Differences,
# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
# I found in the UCLA library.
#
# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise.
# Corrections are welcome!
#
# See the `europe' file for Greenland.
#
# See the `africa' file for Zone naming conventions.
# Canada
# Canada is reportedly lots easier than the US--leastways since 1951.
# I don't know what they did before then.
# 4.3BSD claims that it's perfectly regular.
# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
# "...Canada (well, Ontario and at least some of the other provinces) are
# adopting the new daylight savings time rules...". We assume all of
# Canada is doing so.
# From Bob Devine (January 28, 1988):
# All of Canada did have DST from your first rule except Saskatchewan.
# Which parts did not observe DST is hard to pinpoint but most of the
# province follows the rules.
# NOTE: those that didn't have DST for that rule, also
# probably did not have it for several years previous.
# From U. S. Naval Observatory (January 19, 1989):
# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S
# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29
# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX
# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29
# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA
# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29
# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG
# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29
# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON
# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29
# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER
# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29
# CANADA YUKON SAME AS PACIFIC DAWSON
# From Arthur David Olson (January 21, 1989):
# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
# Note claim that there's double DST in Newfoundland and that Yukon should
# be same as Pacific.
# From W. Jones (jones@skdad.usask.ca) (November 6, 1992):
# The. . .below is based on information I got from our law library, the
# provincial archives, and the provincial Community Services department.
# A precise history would require digging through newspaper archives, and
# since you didn't say what you wanted, I didn't bother.
#
# Saskatchewan is split by a time zone meridian (105W) and over the years
# the boundary became pretty ragged as communities near it reevaluated
# their affiliations in one direction or the other. In 1965 a provincial
# referendum favoured legislating common time practices.
#
# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
# Saskatchewan 1978) was proclaimed, and established that the eastern
# part of Saskatchewan would use CST year round, that districts in
# northwest Saskatchewan would by default follow CST but could opt to
# follow Mountain Time rules (thus 1 hour difference in the winter and
# zero in the summer), and that districts in southwest Saskatchewan would
# by default follow MT but could opt to follow CST.
#
# It took a few years for the dust to settle (I know one story of a town
# on one time zone having its school in another, such that a mom had to
# serve her family lunch in two shifts), but presently it seems that only
# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
# rules any more; all other districts appear to have used CST year round
# since sometime in the 1960s.
#
# Here's how I would summarize things. Establish a "Saskatchewan" CST
# time zone, and note that it officially exists as of 15 April 1966. Any
# current exceptions can put themselves in the "Mountain" zone, since
# those are the rules they follow. Any past exceptions can be forgotten,
# since that's what those who live here have done.
# From Arthur David Olson (November 21, 1992):
# East-Saskatchewan kept to avoid problems for folks using that zone by name;
# plain Saskatchewan added.
# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
# I post here the time zone abbreviations standardized in Canada
# for both English and French in the CAN/CSA-Z234.4-89 standard....
#
# UTC Standard time Daylight savings time
# offset French English French English
# -2:30 - - HAT NDT
# -3 - - HAA ADT
# -3:30 HNT NST - -
# -4 HNA AST HAE EDT
# -5 HNE EST HAC CDT
# -6 HNC CST HAR MDT
# -7 HNR MST HAP PDT
# -8 HNP PST HAY YDT
# -9 HNY YST - -
#
# HN: Heure Normale ST: Standard Time
# HA: Heure Avanc<e'>e DT: Daylight saving Time
#
# A: de l'Atlantique Atlantic
# C: du Centre Central
# E: de l'Est Eastern
# M: Mountain
# N: Newfoundland
# P: du Pacifique Pacific
# R: des Rocheuses
# T: de Terre-Neuve
# Y: du Yukon Yukon
#
# From Paul Eggert <eggert@twinsun.com> (1994-11-22):
# Alas, this sort of thing must be handled by localization software.
# From Shanks (1991):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule StJohns 1884 only - Jan 1 0:00 0 S
Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
Rule StJohns 1917 only - Sep 17 2:00 0 S
Rule StJohns 1918 only - Oct 31 2:00 0 S
# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
Rule StJohns 1919 only - May 5 23:00 1:00 D
Rule StJohns 1919 only - Aug 12 23:00 0 S
# For 1931-1935 Whitman gives Apr same date; go with Shanks.
Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
Rule StJohns 1942 only - Mar 1 0:00 1:00 D
Rule StJohns 1942 only - Dec 31 0:00 0 S
Rule StJohns 1943 only - May 30 0:00 1:00 D
Rule StJohns 1943 only - Sep 5 0:00 0 S
Rule StJohns 1944 only - Jul 10 0:00 1:00 D
Rule StJohns 1944 only - Sep 2 0:00 0 S
Rule StJohns 1945 only - Jan 1 0:00 1:00 D
Rule StJohns 1945 only - Oct 7 2:00 0 S
# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
# Apr 30 - Sep 24; go with Shanks.
Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
Rule StJohns 1960 max - Oct lastSun 2:00 0 S
Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D
Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
# St John's has an apostrophe, but Posix file names can't have apostrophes.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/St_Johns -3:30:52 - LMT 1884
-3:31 StJohns N%sT 1935 Mar 30
-3:30 StJohns N%sT
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Halifax 1902 only - Jun 15 0:00 0 S
Rule Halifax 1916 only - Apr 1 0:00 1:00 D
Rule Halifax 1916 only - Oct 1 0:00 0 S
Rule Halifax 1918 only - Apr 14 2:00 1:00 D
Rule Halifax 1918 only - Oct 31 2:00 0 S
Rule Halifax 1920 only - May 9 0:00 1:00 D
Rule Halifax 1920 only - Aug 29 0:00 0 S
Rule Halifax 1921 only - May 6 0:00 1:00 D
Rule Halifax 1921 1922 - Sep 5 0:00 0 S
Rule Halifax 1922 only - Apr 30 0:00 1:00 D
Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
Rule Halifax 1923 only - Sep 4 0:00 0 S
Rule Halifax 1924 only - Sep 15 0:00 0 S
Rule Halifax 1925 only - Sep 28 0:00 0 S
Rule Halifax 1926 only - May 16 0:00 1:00 D
Rule Halifax 1926 only - Sep 13 0:00 0 S
Rule Halifax 1927 only - May 1 0:00 1:00 D
Rule Halifax 1927 only - Sep 26 0:00 0 S
Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
Rule Halifax 1928 only - Sep 9 0:00 0 S
Rule Halifax 1929 only - Sep 3 0:00 0 S
Rule Halifax 1930 only - Sep 15 0:00 0 S
Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
Rule Halifax 1933 only - Apr 30 0:00 1:00 D
Rule Halifax 1933 only - Oct 2 0:00 0 S
Rule Halifax 1934 only - May 20 0:00 1:00 D
Rule Halifax 1934 only - Sep 16 0:00 0 S
Rule Halifax 1935 only - Jun 2 0:00 1:00 D
Rule Halifax 1935 only - Sep 30 0:00 0 S
Rule Halifax 1936 only - Jun 1 0:00 1:00 D
Rule Halifax 1936 only - Sep 14 0:00 0 S
Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
Rule Halifax 1939 only - May 28 0:00 1:00 D
Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
Rule Halifax 1942 only - Feb 9 2:00 1:00 D
Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
Rule Halifax 1962 max - Oct lastSun 2:00 0 S
Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
-4:00 Halifax A%sT
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Mont 1884 only - Jan 1 0:00 0 S
Rule Mont 1917 only - Mar 25 2:00 1:00 D
Rule Mont 1917 only - Apr 24 0:00 0 S
Rule Mont 1918 only - Apr 14 2:00 1:00 D
Rule Mont 1918 only - Oct 31 2:00 0 S
Rule Mont 1919 only - Mar 31 2:30 1:00 D
Rule Mont 1919 only - Oct 25 2:30 0 S
Rule Mont 1920 only - May 2 2:30 1:00 D
Rule Mont 1920 only - Oct 3 2:30 0 S
Rule Mont 1921 only - May 1 2:00 1:00 D
Rule Mont 1921 only - Oct 2 2:30 0 S
Rule Mont 1922 only - Apr 30 2:00 1:00 D
Rule Mont 1922 only - Oct 1 2:30 0 S
Rule Mont 1924 only - May 17 2:00 1:00 D
Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
Rule Mont 1927 only - May 1 0:00 1:00 D
Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
Rule Mont 1932 only - May 1 0:00 1:00 D
Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
Rule Mont 1933 only - Oct 1 0:00 0 S
Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
Rule Mont 1957 max - Oct lastSun 2:00 0 S
Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Montreal -4:54:16 - LMT 1884
-5:00 Mont E%sT
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Winn 1887 only - Jul 16 0:00 0 S
Rule Winn 1916 only - Apr 23 0:00 1:00 D
Rule Winn 1916 only - Sep 17 0:00 0 S
Rule Winn 1918 only - Apr 14 2:00 1:00 D
Rule Winn 1918 only - Oct 31 2:00 0 S
Rule Winn 1937 only - May 16 2:00 1:00 D
Rule Winn 1937 only - Sep 26 2:00 0 S
Rule Winn 1942 only - Feb 9 2:00 1:00 D
Rule Winn 1945 only - Sep lastSun 2:00 0 S
Rule Winn 1946 only - May 12 2:00 1:00 D
Rule Winn 1946 only - Oct 13 2:00 0 S
Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
Rule Winn 1950 only - May 1 2:00 1:00 D
Rule Winn 1950 only - Sep 30 2:00 0 S
Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
Rule Winn 1959 only - Oct lastSun 2:00 0 S
Rule Winn 1960 only - Sep lastSun 2:00 0 S
Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
Rule Winn 1963 only - Sep 22 2:00 0 S
Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
Rule Winn 1966 max - Oct lastSun 2:00 0 S
Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
-6:00 Winn C%sT
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Regina 1905 only - Sep 1 0:00 0 S
Rule Regina 1918 only - Apr 14 2:00 1:00 D
Rule Regina 1918 only - Oct 31 2:00 0 S
Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
Rule Regina 1942 only - Feb 9 2:00 1:00 D
Rule Regina 1945 only - Sep lastSun 2:00 0 S
Rule Regina 1946 only - Apr 14 2:00 1:00 D
Rule Regina 1946 only - Oct 13 2:00 0 S
Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D
Rule Regina 1947 1959 - Sep lastSun 2:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Regina -6:58:36 - LMT 1905 Sep
-7:00 Regina M%sT 1966 Apr 15
-6:00 - CST
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Edm 1906 only - Sep 1 0:00 0 S
Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
Rule Edm 1918 only - Oct 31 2:00 0 S
Rule Edm 1919 only - May 27 2:00 0 S
Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
Rule Edm 1920 only - Oct lastSun 2:00 0 S
Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
Rule Edm 1942 only - Feb 9 2:00 1:00 D
Rule Edm 1945 only - Sep lastSun 2:00 0 S
Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
Rule Edm 1947 only - Sep lastSun 2:00 0 S
Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
Rule Edm 1967 only - Oct lastSun 2:00 0 S
Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
Rule Edm 1969 only - Oct lastSun 2:00 0 S
Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
Rule Edm 1972 max - Oct lastSun 2:00 0 S
Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Edmonton -7:33:52 - LMT 1906 Sep
-7:00 Edm M%sT
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Vanc 1884 only - Jan 1 0:00 0 S
Rule Vanc 1918 only - Apr 14 2:00 1:00 D
Rule Vanc 1918 only - Oct 31 2:00 0 S
Rule Vanc 1942 only - Feb 9 2:00 1:00 D
Rule Vanc 1945 only - Sep 30 2:00 0 S
Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
Rule Vanc 1946 only - Oct 13 2:00 0 S
Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
Rule Vanc 1962 max - Oct lastSun 2:00 0 S
Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Vancouver -8:12:28 - LMT 1884
-8:00 Vanc P%sT
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Yukon 1900 only - Jan 1 0:00 0 S
Rule Yukon 1918 only - Apr 14 2:00 1:00 D
Rule Yukon 1918 only - Oct 27 2:00 0 S
Rule Yukon 1919 only - May 25 2:00 1:00 D
Rule Yukon 1919 only - Nov 1 0:00 0 S
Rule Yukon 1942 only - Feb 9 2:00 1:00 D
Rule Yukon 1965 only - Apr 25 0:00 1:00 D
Rule Yukon 1965 only - Oct 31 2:00 0 S
Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D
Rule Yukon 1980 max - Oct lastSun 2:00 0 S
Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
-9:00 Yukon Y%sT 1966 Jul
-8:00 Yukon P%sT
# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28.
###############################################################################
# Mexico
# From Guy Harris:
# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
# Rules prior to 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; Mexico/BajaSur is for "Baja California Sur and N. Pacific
# Coast (States of Sinaloa and Sonora)."
# From Bob Devine (January 28, 1988):
# The Federal District (where Mexico City is) has observed [DST] several
# times but not recently.
#
# I don't where to drawn 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?).
#
# 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 (February 13, 1988)
# Since the 1981 starting date is only "probable," we'll keep the 1987
# starting date below.
# From U. S. Naval Observatory (January 19, 1989):
# 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 PARALLAL APR 3
# MEXICO BAJA CAL N - OCT 29
# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL 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
# From Arthur David Olson (January 21, 1989):
# 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 <eggert@twinsun.com> (November 18, 1993):
# Shanks also says there are four zones, but disagrees about the fourth.
# Instead of GMT-6 with DST, he says there's GMT-8 without DST.
# From Shanks (1991):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Mexico 1922 only - Jan 1 0:00 0 S
Rule Mexico 1939 only - Feb 5 0:00 1:00 D
Rule Mexico 1939 only - Jun 25 0:00 0 S
Rule Mexico 1940 only - Dec 9 0:00 1:00 D
Rule Mexico 1941 only - Apr 1 0:00 0 S
Rule Mexico 1943 only - Dec 16 0:00 1:00 D
Rule Mexico 1944 only - May 1 0:00 0 S
Rule Mexico 1950 only - Feb 12 0:00 1:00 D
Rule Mexico 1950 only - Jul 30 0:00 0 S
Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
-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 Mexico C%sT
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
-7:00 - MST 1949 Jan 14
-8:00 - PST 1970
-7:00 - MST
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
-7:00 - MST 1949 Jan 14
-8:00 BajaN P%sT 1967 Apr lastSun 2:00
-8:00 US P%sT
Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
-8:00 - PST 1927 Jun 10 23:00
-7:00 - MST 1930 Nov 16
-8:00 - PST 1942 Apr
-7:00 - MST 1949 Jan 14
-8:00 - PST
#
# Revillagigedo Is
# no information
###############################################################################
# Anguilla
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
-4:00 - AST
# Antigua and Barbuda
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
-5:00 - EST 1951
-4:00 - AST
# Bahamas
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Bahamas 1912 only - Mar 2 0:00 0 S
Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
-5:00 Bahamas E%sT
# Barbados
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Barb 1932 only - Jan 1 0:00 0 S
Rule Barb 1977 only - Jun 12 2:00 1:00 D
Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
Rule Barb 1979 only - Sep 30 2:00 0 S
Rule Barb 1980 only - Sep 25 2:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
-3:58 - BMT 1932 # Bridgetown Mean Time
-4:00 Barb A%sT
# Belize
# Whitman entirely disagrees with Shanks; go with Shanks.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Belize 1912 only - Apr 1 0:00 0 S
Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
Rule Belize 1973 only - Dec 5 0:00 1:00 D
Rule Belize 1974 only - Feb 9 0:00 0 S
Rule Belize 1982 only - Dec 18 0:00 1:00 D
Rule Belize 1983 only - Feb 12 0:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Belize -5:52:48 - LMT 1912 Apr
-6:00 Belize C%sT
# Bermuda
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
-4:00 - AST 1974 Apr 28 2:00
-4:00 Bahamas A%sT
# Cayman Is
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
-5:07 - KMT 1912 Feb # Kingston Mean Time
-5:00 - EST
# Clipperton
# no information
# Costa Rica
# Shanks gives some very odd dates for 1991, and stops there.
# For now, we won't guess further.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule CR 1921 only - Jan 15 0:00 0 S
Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
Rule CR 1991 only - Jan 19 0:00 1:00 D
Rule CR 1991 only - Jul 1 0:00 0 S
# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
-5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
-6:00 CR C%sT
# Coco
# no information; probably like America/Costa_Rica
# Cuba
# From Bob Devine (January 28, 1988):
# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
# (I think).
# From U. S. Naval Observatory (January 19, 1989):
# CUBA 5 H BEHIND UTC
# CUBA 4 H BEHIND UTC MAR 20 - OCT 8
# From Shanks (1991):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Cuba 1925 only - Jul 19 12:00 0 S
Rule Cuba 1928 only - Jun 10 0:00 1:00 D
Rule Cuba 1928 only - Oct 10 0:00 0 S
Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
Rule Cuba 1965 only - Jun 1 0:00 1:00 D
Rule Cuba 1965 only - Sep 30 0:00 0 S
Rule Cuba 1966 only - May 29 0:00 1:00 D
Rule Cuba 1966 only - Oct 2 0:00 0 S
Rule Cuba 1967 only - Apr 8 0:00 1:00 D
Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
Rule Cuba 1968 only - Apr 14 0:00 1:00 D
Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
Rule Cuba 1972 1974 - Oct 8 0:00 0 S
Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
Rule Cuba 1978 only - May 7 0:00 1:00 D
Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S
Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S
Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
Rule Cuba 1990 only - Apr 1 0:00 1:00 D
Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Havana -5:29:28 - LMT 1890
-5:30 - HMT 1925 Jul 19 12:00 # Havana MT
-5:00 Cuba C%sT
# Dominica
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
-4:00 - AST
# Dominican Republic
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule DR 1933 only - Apr 1 12:00 0 S
Rule DR 1966 only - Oct 30 0:00 1:00 D
Rule DR 1967 only - Feb 28 0:00 0 S
Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
Rule DR 1970 only - Feb 21 0:00 0 S
Rule DR 1971 only - Jan 20 0:00 0 S
Rule DR 1972 1974 - Jan 21 0:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Santo_Domingo -4:39:36 - LMT 1890
-4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
-5:00 DR E%sT 1974 Oct 27
-4:00 - AST
# El Salvador
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Salv 1921 only - Jan 1 0:00 0 S
Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
# There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
-6:00 Salv C%sT
# Grenada
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Grenada -4:07:00 - LMT 1911 Jul
-4:00 - AST
# Guadeloupe
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
-4:00 - AST
# Guatemala
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Guat 1918 only - Oct 5 0:00 0 S
Rule Guat 1973 only - Nov 25 0:00 1:00 D
Rule Guat 1974 only - Feb 24 0:00 0 S
Rule Guat 1983 only - May 21 0:00 1:00 D
Rule Guat 1983 only - Sep 22 0:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
-6:00 Guat C%sT
# Haiti
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Haiti 1917 only - Jan 24 12:00 0 S
Rule Haiti 1983 only - May 8 0:00 1:00 D
Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D
Rule Haiti 1988 max - Oct lastSun 2:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Port-au-Prince -4:49:20 - LMT 1890
-4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
-5:00 Haiti E%sT
# Honduras
# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
-6:00 Salv C%sT
# Jamaica
# From Bob Devine (January 28, 1988):
# Follows US rules.
# From U. S. Naval Observatory (January 19, 1989):
# JAMAICA 5 H BEHIND UTC
# From Shanks (1991):
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
-5:07 - KMT 1912 Feb # Kingston Mean Time
-5:00 - EST 1974 Jan 6 2:00
-5:00 US E%sT
# Martinique
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
-4:04 - FFMT 1911 May # Fort-de-France MT
-4:00 - AST 1980 Apr 6
-4:00 1:00 ADT 1980 Sep 28
-4:00 - AST
# Montserrat
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth
-4:00 - AST
# Nicaragua
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Nic 1975 only - Feb 16 0:00 0 S
Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Managua -5:45:08 - LMT 1890
-5:45 - MMT 1934 Jun 23 # Managua Mean Time
-6:00 - CST 1973 May
-5:00 - EST 1975 Feb 16
-6:00 Nic C%sT
# Panama
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Panama -5:18:08 - LMT 1890
-5:20 - PMT 1908 Apr 22 # Panama Mean Time
-5:00 - EST
# Puerto Rico
# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan
-4:00 - AST 1942 May 3
-4:00 1:00 ADT 1945 Sep 30 2:00
-4:00 - AST
# St Kitts-Nevis
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
-4:00 - AST
# St Lucia
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
-4:04 - CMT 1912 # Castries Mean Time
-4:00 - AST
# St Pierre and Miquelon
# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
-4:00 - AST 1980 May
-3:00 Mont SP%sT
# St Vincent and the Grenadines
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
-4:05 - KMT 1912 # Kingstown Mean Time
-4:00 - AST
# Turks and Caicos
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Grand_Turk -4:44:32 - LMT 1890
-5:07 - KMT 1912 Feb # Kingston Mean Time
-5:00 - EST 1979 Apr 29 2:00
-5:00 US E%sT
# Virgin Is (British and US)
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie
-4:00 - AST
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