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authorUlrich Drepper <drepper@redhat.com>1998-02-15 19:31:34 +0000
committerUlrich Drepper <drepper@redhat.com>1998-02-15 19:31:34 +0000
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Update.
1998-02-15 Ulrich Drepper <drepper@cygnus.com> * nss/nsswitch.c (__nss_lookup): Return 1 if this was the last module. * nss/getXXent_r.c: If no more module is found don't try to call setXXent functions but leave unsuccessfully. * malloc/obstack.h: Cleanups. * sysdeps/wordsize-32/stdint.h: New file. * sysdeps/wordsize-64/stdint.h: New file. * sysdeps/generic/stdint.h: New file. * sysdeps/wordsize-32/inttypes.h: Adopt to use stdint.h. * sysdeps/wordsize-64/inttypes.h: Likewise. * stdlib/Makefile (headers): Add stdint.h. 1998-02-03 Paul Eggert <eggert@twinsun.com> * malloc/obstack.h (PTR_INT_TYPE): Use __PTRDIFF_TYPE__ if available. 1998-02-13 17:59 Zack Weinberg <zack@rabi.phys.columbia.edu> * timezone: New directory. * time/README, time/africa, time/antarctica, time/asia, time/australasia, time/backward, time/checktab.awk, time/etcetera, time/europe, time/factory, time/ialloc.c, time/iso3166.tab, time/leapseconds, time/northamerica, time/pacificnew, time/private.h, time/scheck.c, time/solar87, time/solar88, time/solar89, time/southamerica, time/systemv, time/test-tz.c, time/tzfile.h, time/tzselect.ksh, time/yearistype, time/zdump.c, time/zic.c, time/zone.tab: Moved to timezone. * time/tzfile.c: Include tzfile.h from timezone subdir. * time/tzset.c: Likewise. * time/Makefile: Cut out all code relating to timezones... * timezone/Makefile: ...and paste it in here. * Makefile (subdirs): Add timezone. 1998-02-13 18:45 H.J. Lu <hjl@gnu.org> * libc.map (_sys_nerr): Added. * sysdeps/unix/sysv/linux/errlist.c (_sys_nerr): Make it versioned symbol. 1998-02-15 17:16 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/bits/socket.h: Define PF_KEY and pseudo_AF_KEY instead of pseudo_PF_KEY and AF_KEY. Reported by Craig Metz <cmetz@inner.net>. 1998-01-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * nss/nss_files/files-parse.c (LOOKUP_NAME_CASE): Use __strcasecmp instead of strcasecmp. * nss/nss_files/files-alias.c (get_next_alias): Likewise. * wctype/wctype.h (_ISwbit): Avoid warning with gcc before 2.8. 1998-02-15 16:55 Ulrich Drepper <drepper@cygnus.com> * socket/sys/socket.h (setsockopt): Make OPTVAL parameter const. Patch by Dean Gaudet <dgaudet@arctic.org>. 1998-02-15 16:53 Ulrich Drepper <drepper@cygnus.com> * sysdeps/generic/Dist: Add getresgid.c and getresuid.c. 1998-02-15 10:49 Zack Weinberg <zack@rabi.phys.columbia.edu> * sysdeps/unix/sysv/linux/poll.c: If compiled against a kernel with no poll syscall, just include the BSD version. * sysdeps/unix/sysv/linux/getresuid.c: If compiled against a kernel without the syscall, include the stub version. * sysdeps/unix/sysv/linux/getresgid.c: Likewise. * sysdeps/generic/getresuid.c: New file. * sysdeps/generic/getresgid.c: New file. 1998-02-15 Ulrich Drepper <drepper@cygnus.com> * stdio-common/vfscanf.c: Correct last change a bit.
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+# @(#)northamerica 7.39
+# 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> (1994-08-17):
+# 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 Paul Eggert <eggert@twinsun.com> (1995-12-19):
+# A good source for time zone historical data in the US is
+# Thomas G. Shanks, The American Atlas (5th edition),
+# San Diego: ACS Publications, Inc. (1991).
+# Make sure you have the errata sheet; the book is somewhat useless without it.
+# It is the source for the US and Puerto Rico entries below.
+
+# From Paul Eggert (1996-06-12):
+# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
+# in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784).
+# Not everyone is happy with the results:
+#
+# I don't really care how time is reckoned so long as there is some
+# agreement about it, but I object to being told that I am saving
+# daylight when my reason tells me that I am doing nothing of the kind.
+# I even object to the implication that I am wasting something
+# valuable if I stay in bed after the sun has risen. As an admirer
+# of moonlight I resent the bossy insistence of those who want to
+# reduce my time for enjoying it. At the back of the Daylight Saving
+# scheme I detect the bony, blue-fingered hand of Puritanism, eager
+# to push people into bed earlier, and get them up earlier, to make
+# them healthy, wealthy and wise in spite of themselves.
+#
+# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
+
+# 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, 1974-10-26
+# and Sunday, 1974-10-27 editions of the Washington Post.
+
+# 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 W # War
+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 (1988-01-28):
+# ...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 Paul Eggert (1995-12-19):
+# The tables below use `NST', not `NT', for Nome Standard Time.
+# I invented `CAWT' for Central Alaska War Time.
+
+# From U. S. Naval Observatory (1989-01-19):
+# 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 (1989-01-21):
+# 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 (1988-02-13):
+# 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 1967-04-01 (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 1967-04-01 until 1983-11-30 (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 1983-11-30:
+# 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 (1995-12-19):
+# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
+# Go with Shanks.
+
+# US Eastern time, represented by New York
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
+Rule NYC 1920 only - Oct lastSun 2:00 0 S
+Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
+Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
+Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
+ -5:00 US E%sT 1920
+ -5:00 NYC E%sT 1942
+ -5:00 US E%sT 1946
+ -5:00 NYC E%sT 1967
+ -5:00 US E%sT
+
+# US Central time, represented by Chicago
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule Chicago 1920 only - Jun 13 2:00 1:00 D
+Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
+Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
+Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
+Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
+Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
+ -6:00 US C%sT 1920
+ -6:00 Chicago C%sT 1936 Mar 1 2:00
+ -5:00 - EST 1936 Nov 15 2:00
+ -6:00 Chicago C%sT 1942
+ -6:00 US C%sT 1946
+ -6:00 Chicago C%sT 1967
+ -6:00 US C%sT
+
+# US Mountain time, represented by Denver
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
+Rule Denver 1920 only - Oct lastSun 2:00 0 S
+Rule Denver 1921 only - May 22 2:00 0 S
+Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
+Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
+ -7:00 US M%sT 1920
+ -7:00 Denver M%sT 1942
+ -7:00 US M%sT 1946
+ -7:00 Denver M%sT 1967
+ -7:00 US M%sT
+
+# US Pacific time, represented by Los Angeles
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule CA 1948 only - Mar 14 2:00 1:00 D
+Rule CA 1949 only - Jan 1 2:00 0 S
+Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
+Rule CA 1950 1961 - Sep lastSun 2:00 0 S
+Rule CA 1962 1966 - Oct lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
+ -8:00 US P%sT 1946
+ -8:00 CA P%sT 1967
+ -8:00 US P%sT
+
+# Alaska
+# AK%sT is the modern abbreviation for -9:00 per USNO.
+#
+# From Paul Eggert (1995-12-19):
+# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
+# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
+# This was on 1867-10-18. We omit this transition, since we can't represent
+# changes from Julian to Gregorian.
+#
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00
+ -8:00 - PST 1942
+ -8:00 US P%sT 1946
+ -8:00 - PST 1969
+ -8:00 US P%sT 1983 Oct 30 2:00
+ -9:00 US AK%sT
+Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00
+ -9:00 - YST 1942
+ -9:00 US Y%sT 1946
+ -9:00 - YST 1969
+ -9:00 US Y%sT 1983 Oct 30 2:00
+ -9:00 US AK%sT
+Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00
+ -10:00 - CAT 1942
+ -10:00 US CAT/CAWT 1946
+ -10:00 - CAT 1967 Apr
+ -10:00 - AHST 1969
+ -10:00 US AH%sT 1983 Oct 30 2:00
+ -9:00 US AK%sT
+Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00
+ -11:00 - NST 1942
+ -11:00 US N%sT 1946
+ -11:00 - NST 1967 Apr
+ -11:00 - BST 1969
+ -11:00 US B%sT 1983 Oct 30 2:00
+ -9:00 US AK%sT
+Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00
+ -11:00 - NST 1942
+ -11:00 US N%sT 1946
+ -11:00 - NST 1967 Apr
+ -11:00 - BST 1969
+ -11:00 US B%sT 1983 Oct 30 2:00
+ -10:00 US HA%sT
+# Shanks writes that part of southwest Alaska (e.g. Aniak)
+# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
+# and another part (e.g. Akiak) made the same switch five weeks later.
+# These switches don't quite make our 1970 cutoff.
+
+# Hawaii
+#
+# From Arthur David Olson:
+# And then there's Hawaii.
+# DST was observed for one day in 1933;
+# standard time was changed by half an hour in 1947;
+# it's always standard as of 1986.
+#
+# From Paul Eggert:
+# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
+#
+Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
+ -10:30 - HST 1933 Apr 30 2:00
+ -10:30 1:00 HDT 1933 May 21 2:00
+ -10:30 US H%sT 1947 Jun 8 2:00
+ -10:00 - HST
+
+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
+
+# Now we turn to US areas that have diverged from the consensus since 1970.
+
+# Arizona mostly uses MST.
+Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
+ -7:00 US M%sT 1944 Jan 1 00:01
+ -7:00 - MST 1944 Mar 17 00:01
+ -7:00 US M%sT 1944 Oct 1 00:01
+ -7:00 - MST 1967
+ -7:00 US M%sT 1968
+ -7:00 - MST
+# From Arthur David Olson (1988-02-13):
+# 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
+
+# Southern Idaho and eastern Oregon switched four weeks late in 1974.
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
+ -8:00 US P%sT 1923 May 13 2:00
+ -7:00 US M%sT 1974
+ -7:00 - MST 1974 Feb 3 2:00
+ -7:00 US M%sT
+
+# Indiana
+#
+# From Paul Eggert (1995-12-19):
+# Indiana generally observes either EST all year, or CST/CDT,
+# but areas near Cincinnati and Louisville use those cities' timekeeping
+# and in 1969 and 1970 the whole state observed daylight time;
+# and there are other exceptions as noted below.
+# Shanks partitions Indiana into 345 regions, each with its own time history,
+# and writes ``Even newspaper reports present contradictory information.''
+# Fortunately, most of the complexity occurred before our cutoff date of 1970.
+#
+# Since 1970, EST-only Indiana has been like America/Indianapolis,
+# with exceptions noted below for Crawford, Starke, and Switzerland counties.
+# The parts of Indiana not listed below have been like America/Chicago,
+# America/Louisville, or America/New_York.
+#
+# Other than Indianapolis, the Indiana place names are so nondescript
+# that they would be ambiguous if we left them at the `America' level.
+# So we reluctantly put them all in a subdirectory `America/Indiana'.
+#
+# Most of EST-only Indiana last observed DST in 1970.
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
+Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
+Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
+ -6:00 US C%sT 1920
+ -6:00 Indianapolis C%sT 1942
+ -6:00 US C%sT 1946
+ -6:00 Indianapolis C%sT 1955 Apr 24 2:00
+ -5:00 - EST 1957 Sep 29 2:00
+ -6:00 - CST 1958 Apr 27 2:00
+ -5:00 - EST 1969
+ -5:00 US E%sT 1971
+ -5:00 - EST
+Link America/Indianapolis America/Indiana/Indianapolis
+#
+# Part of Crawford County, Indiana, last observed DST in 1975,
+# and left its clocks alone in 1974.
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
+Rule Marengo 1951 only - Sep lastSun 2:00 0 S
+Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
+Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
+ -6:00 US C%sT 1951
+ -6:00 Marengo C%sT 1961 Apr 30 2:00
+ -5:00 - EST 1969
+ -5:00 US E%sT 1974 Jan 6 2:00
+ -6:00 1:00 CDT 1974 Oct 27 2:00
+ -5:00 US E%sT 1976
+ -5:00 - EST
+#
+# Starke County, Indiana
+# From Arthur David Olson (1991-10-28):
+# An article on page A3 of the Sunday, 1991-10-27 Washington Post
+# notes that Starke County switched from Central time to Eastern time as of
+# 1991-10-27.
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
+Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
+Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
+Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
+Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
+ -6:00 US C%sT 1947
+ -6:00 Starke C%sT 1962 Apr 29 2:00
+ -5:00 - EST 1963 Oct 27 2:00
+ -6:00 US C%sT 1991 Oct 27 2:00
+ -5:00 - EST
+#
+# Switzerland County, Indiana, last observed DST in 1972.
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
+ -6:00 US C%sT 1954 Apr 25 2:00
+ -5:00 - EST 1969
+ -5:00 US E%sT 1973
+ -5:00 - EST
+
+# Part of Kentucky left its clocks alone in 1974.
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule Louisville 1921 only - May 1 2:00 1:00 D
+Rule Louisville 1921 only - Sep 1 2:00 0 S
+Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
+Rule Louisville 1941 only - Sep lastSun 2:00 0 S
+Rule Louisville 1946 only - Jun 2 2:00 0 S
+Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
+Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
+ -6:00 US C%sT 1921
+ -6:00 Louisville C%sT 1942
+ -6:00 US C%sT 1946
+ -6:00 Louisville C%sT 1961 Jul 23 2:00
+ -5:00 - EST 1968
+ -5:00 US E%sT 1974 Jan 6 2:00
+ -6:00 1:00 CDT 1974 Oct 27 2:00
+ -5:00 US E%sT
+
+# Michigan
+#
+# From Bob Devine (1988-01-28):
+# Michigan didn't observe DST from 1968 to 1973.
+#
+# From Paul Eggert (1995-12-19):
+# Shanks writes that Michigan started using standard time on 1885 Sep 18,
+# but Howse (p 126) writes that Detroit kept
+#
+# local time until 1900 when the City Council decreed that clocks should
+# be put back twenty-eight minutes to Central Standard Time. Half the
+# city obeyed, half refused. After considerable debate, the decision
+# was rescinded and the city reverted to Sun time. A derisive offer to
+# erect a sundial in front of the city hall was referred to the
+# Committee on Sewers. Then, in 1905, Central time was adopted
+# by city vote.
+#
+# This story is too entertaining to be false, so go with Howse over Shanks.
+#
+# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
+Rule Detroit 1948 only - Sep lastSun 2:00 0 S
+Rule Detroit 1967 only - Jun 14 2:00 1:00 D
+Rule Detroit 1967 only - Oct lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Detroit -5:32:11 - LMT 1905
+ -6:00 - CST 1915 May 15 2:00
+ -5:00 - EST 1942
+ -5:00 US E%sT 1946
+ -5:00 Detroit E%sT 1973
+ -5:00 US E%sT 1975
+ -5:00 - EST 1975 Apr 27 2:00
+ -5:00 US E%sT
+#
+# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
+Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
+Rule Menominee 1946 only - Sep lastSun 2:00 0 S
+Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
+Rule Menominee 1966 only - Oct lastSun 2:00 0 S
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
+ -6:00 US C%sT 1946
+ -6:00 Menominee C%sT 1969 Apr 27 2:00
+ -5:00 - EST 1973 Apr 29 2:00
+ -6:00 US C%sT
+
+# Navassa
+# uninhabited
+
+
+# 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/Indianapolis EST
+Link America/Phoenix MST
+Link Pacific/Honolulu HST
+
+################################################################################
+
+
+# From Paul Eggert <eggert@twinsun.com> (1996-11-22):
+# A good source for time zone historical data outside the US is
+# Thomas G. Shanks, The International Atlas (3rd edition),
+# San Diego: ACS Publications, Inc. (1991).
+#
+# Gwillim Law <LAW@encmail.encompass.com> writes that a good source
+# for recent time zone data is the International Air Transport
+# Association's Standard Schedules Information Manual (IATA SSIM),
+# published semiannually. Law sent in several helpful summaries
+# of the IATA's data after 1990.
+#
+# Except where otherwise noted, Shanks is the source for entries through 1990,
+# and IATA SSIM is the source for entries after 1990.
+#
+# 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.
+#
+# See the `europe' file for Greenland.
+
+# Canada
+
+# 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.
+
+# The data for Canada are all from Shanks (1991).
+
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
+Rule Canada 1918 only - Apr 14 2:00 1:00 D
+Rule Canada 1918 only - Oct 31 2:00 0 S
+Rule Canada 1942 only - Feb 9 2:00 1:00 D
+Rule Canada 1945 only - Sep 30 2:00 0 S
+Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
+Rule Canada 1974 max - Oct lastSun 2:00 0 S
+Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
+
+
+# Newfoundland (except Labrador)
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/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 DD
+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
+ -3:30:52 StJohns N%sT 1935 Mar 30
+ -3:30 StJohns N%sT
+
+
+# east Labrador
+
+# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
+ -3:30:52 StJohns NST 1919
+ -3:30:52 - NST 1935 Mar 30
+ -3:30 - NST 1936
+ -3:30 StJohns N%sT 1966 Mar 15 2:00
+ -4:00 StJohns A%sT
+
+
+# west Labrador, New Brunswick, Nova Scotia, Prince Edward I
+
+# From Paul Eggert (1996-06-12):
+# Shanks writes that since 1970 most of this region has been like Halifax.
+# Many locales did not observe peacetime DST until 1972;
+# Glace Bay, NS is the largest that we know of.
+# Shanks also writes that Liverpool, NS was the only town in Canada to observe
+# DST in 1971 but not 1970; for now we'll assume this is a typo.
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/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
+Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
+ -4:00 Canada A%sT 1953
+ -4:00 Halifax A%sT 1954
+ -4:00 - AST 1972
+ -4:00 Halifax A%sT
+
+
+# Ontario, Quebec
+
+# From Paul Eggert (1996-06-12):
+# Shanks writes that since 1970 most of this region has been like Montreal.
+# Thunder Bay skipped DST in 1973.
+# Many smaller locales did not observe peacetime DST until 1974;
+# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
+# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
+
+# From Paul Eggert (1997-10-17):
+# msb@sq.com writes that an article in the 1997-10-14 Toronto Star
+# says that Atikokan, Ontario currently does not observe DST,
+# but will vote on 11-10 whether to use EST/EDT.
+# He also writes that the
+# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
+# Ontario Time Act (1990, Chapter T.9)
+# </a>
+# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
+# Officially Atikokan is therefore on CST/CDT, and most likely this report
+# concerns a non-official time observed as a matter of local practice.
+# For what it's worth, Shanks (1995) says that Atikokan has agreed with
+# Rainy River ever since standard time was introduced.
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/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
+Zone America/Thunder_Bay -5:57:00 - LMT 1895
+ -5:00 Canada E%sT 1970
+ -5:00 Mont E%sT 1973
+ -5:00 - EST 1974
+ -5:00 Canada E%sT
+Zone America/Nipigon -5:53:04 - LMT 1895
+ -5:00 Canada E%sT
+Zone America/Rainy_River -6:17:56 - LMT 1895
+ -6:00 Canada C%sT
+
+
+# Manitoba
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/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
+
+
+# Saskatchewan
+
+# From Paul Eggert (1996-06-12):
+# Shanks writes that since 1970 most of this region has been like Regina.
+# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
+# Other western towns (e.g. Lloydminster) are like Edmonton.
+
+# From W. Jones <jones@skdad.usask.ca> (1992-11-06):
+# 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.
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/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 Sun>=8 2:00 1:00 D
+Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
+Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
+Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
+Rule Regina 1959 only - Oct lastSun 2:00 0 S
+#
+Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
+Rule Swift 1957 only - Oct lastSun 2:00 0 S
+Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
+Rule Swift 1959 only - Oct lastSun 2:00 0 S
+Rule Swift 1960 1961 - 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 1960 Apr lastSun 2:00
+ -6:00 - CST
+Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
+ -7:00 Canada M%sT 1946 Apr lastSun 2:00
+ -7:00 Regina M%sT 1950
+ -7:00 Swift M%sT 1972 Apr lastSun 2:00
+ -6:00 - CST
+
+
+# Alberta
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/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
+
+
+# British Columbia
+
+# From Paul Eggert (1996-06-12):
+# Shanks writes that since 1970 most of this region has been like Vancouver.
+# Dawswon Creek uses MST. Much of east BC is like Edmonton.
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/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
+Zone America/Dawson_Creek -8:00:56 - LMT 1884
+ -8:00 Canada P%sT 1947
+ -8:00 Vanc P%sT 1972 Aug 30 2:00
+ -7:00 - MST
+
+
+# Northwest Territories, Yukon
+
+# From Paul Eggert (1996-10-07):
+# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
+# Shanks's table for Watson Lake is corrupted, so we have no data there.
+# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
+# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
+# c. 7 defines Yukon standard time as UTC-9. This is still valid;
+# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
+# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
+# * O.I.C. 1980/02 established DST.
+# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
+# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
+Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
+Rule NT_YK 1918 only - Oct 27 2:00 0 S
+Rule NT_YK 1919 only - May 25 2:00 1:00 D
+Rule NT_YK 1919 only - Nov 1 0:00 0 S
+Rule NT_YK 1942 only - Feb 9 2:00 1:00 D
+Rule NT_YK 1945 only - Sep 30 2:00 0 S
+Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
+Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
+Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
+Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
+Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Pangnirtung -4:22:56 - LMT 1884
+ -4:00 NT_YK A%sT
+Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay
+ -5:00 NT_YK E%sT
+Zone America/Rankin_Inlet -6:08:40 - LMT 1884
+ -6:00 NT_YK C%sT
+Zone America/Yellowknife -7:37:24 - LMT 1884
+ -7:00 NT_YK M%sT
+Zone America/Inuvik -8:54:00 - LMT 1884
+ -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
+ -7:00 NT_YK M%sT
+Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
+ -9:00 NT_YK Y%sT 1966 Jul 1 2:00
+ -8:00 NT_YK P%sT
+Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
+ -9:00 NT_YK Y%sT 1973 Oct 28 0:00
+ -8:00 NT_YK P%sT
+
+
+###############################################################################
+
+# 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.
+#
+# 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 (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
+
+# 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 <eggert@twinsun.com> (1993-11-18):
+# 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 Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
+# A guy from our Mexico subsidiary finally found the Presidential Decree
+# outlining the timezone changes in Mexico.
+#
+# ------------- Begin Forwarded Message -------------
+#
+# I finally got my hands on the Official Presidential Decree that sets up the
+# rules for the DST changes. The rules are:
+#
+# 1. The country is divided in 3 timezones:
+# - Baja California Norte (the Mexico/BajaNorte TZ)
+# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
+# - The rest of the country (the Mexico/General TZ)
+#
+# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
+# at 2:00 AM, the times in each zone are as follows:
+# BajaNorte: GMT+7
+# BajaSur: GMT+6
+# General: GMT+5
+#
+# 3. The rest of the year, the times are as follows:
+# BajaNorte: GMT+8
+# BajaSur: GMT+7
+# General: GMT+6
+#
+# The Decree was published in Mexico's Official Newspaper on January 4th.
+#
+# -------------- End Forwarded Message --------------
+# From Paul Eggert (1996-06-12):
+# For an English translation of the decree, see
+# <a href="http://mexico-travel.com/extra/timezone_eng.html">
+# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
+# </a>
+
+# From Shanks (1991):
+# 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
+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 Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
+Rule Mexico 1996 max - Oct lastSun 2:00 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 Mexico M%sT
+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 1996
+ -8:00 Mexico 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 1996
+ -8:00 Mexico P%sT
+#
+# 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 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 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 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
+# uninhabited
+
+# 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 1979 1980 - Feb lastSun 0:00 1:00 D
+Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
+Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
+# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
+Rule CR 1991 only - Jul 1 0:00 0 S
+Rule CR 1992 only - Mar 15 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 (1988-01-28):
+# . . .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 (1989-01-19):
+# 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 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 1990 - 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 1986 1989 - Mar Sun>=14 0:00 1:00 D
+Rule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D
+Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
+Rule Cuba 1996 only - Oct Sun>=1 0:00s 0 S
+Rule Cuba 1997 max - Oct Sun>=8 0:00s 0 S
+
+# 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 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 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 # St George's
+ -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 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
+Rule Guat 1991 only - Mar 23 0:00 1:00 D
+Rule Guat 1991 only - Sep 7 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 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
+# Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA.
+Rule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D
+Rule Haiti 1988 max - Oct lastSun 1:00s 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 (1988-01-28):
+# Follows US rules.
+
+# From U. S. Naval Observatory (1989-01-19):
+# 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 1984
+ -5:00 - EST
+
+# 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
+# From Paul Eggert (1997-08-31):
+# Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
+# Luckily, Olveston, the current de facto capital, has the same longitude.
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
+ -4:00 - AST
+
+# Nicaragua
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
+Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
+Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
+Rule Nic 1992 only - Jan 1 4:00 1:00 D
+Rule Nic 1992 only - Sep 24 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 1993 Jan 1 4:00
+ -5:00 - EST
+
+# 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 -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
+ -4:00 - AST 1942 May 3
+ -4:00 1:00 AWT 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 PM%sT # Pierre & Miquelon Time
+
+# 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
+# From Paul Eggert (1996-11-22):
+# Shanks says they use US DST rules, but IATA SSIM (1991/1996)
+# says they switch at midnight. Go with IATA SSIM.
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
+Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
+Rule TC 1979 max - Oct lastSun 0:00 0 S
+Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
+# 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 TC E%sT
+
+# British Virgin Is
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
+ -4:00 - AST
+
+# Virgin Is
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
+ -4:00 - AST