proposed tz followup changes for Indiana, Japan, etc.
Paul Eggert
eggert at CS.UCLA.EDU
Tue Aug 23 07:23:20 UTC 2005
> Date: Mon, 22 Aug 2005 10:49:55 -0700
> From: Eric Fischer <enf at pobox.com>
> In the "northamerica" file, I think the
>
> Link America/Indianapolis EST
>
> line needs to be
>
> Link America/Indiana/Indianapolis EST
Thanks for pointing out the problem, but that points out a more
serious problem: starting next year, Indianapolis will observe
daylight-saving time, so linking it to "EST" will no longer be
appropriate.
Here is a proposed patch to fix this problem, along with some other
Indiana-related issues. Also, I found an article detailing Japan's
daylight-saving time during the occupation, and decided that most of
the country was really observing DST, so we need to update our tables.
And there were a couple other minor changes in recent discussion.
Changes affecting current and future time stamps.
* Since Indianapolis will start observing DST next year,
"Link America/Indianaopolis EST" is no longer appropriate.
Link from America/Panama instead. (Thanks to Eric Fischer
for pointing out the problem.)
Changes affecting historical time stamps.
* Japan observed DST from 1948 through 1951. I knew about this already,
but did not realize how much affected daily life until I read an article
in the 2005-08-10 Japan Times. (Thanks to Mayumi Negishi for writing that
article.)
Organizational changes
* Move the following entries from "northamerica" to "backward",
since they are present only for backward compatibility:
EST5EDT CST6CDT MST7MDT PST8PDT EST MST HST
* Sort the entries in "backward".
Commentary changes
* Update "Theory" to mention that uninhabited countries do not
need Zone entries. (Thanks to Mark Davis for spotting this.)
* Mention JDT and KDT in the commentary about abbreviations.
* Mention that "US" rules are used only in the United States.
(Thanks to Arthur David Olson for this.)
* Update Indiana commentary to match current situation.
Web page changes
* Update Indiana-related commentary. Fix typo: Starke County is in
Indiana, not Kentucky.
* Update obsolete URL in tz-art.htm. (Thanks to Frank Vance for this.)
===================================================================
RCS file: RCS/Theory,v
retrieving revision 2005.12
retrieving revision 2005.12.0.1
diff -pu -r2005.12 -r2005.12.0.1
--- Theory 2005/08/22 16:06:13 2005.12
+++ Theory 2005/08/23 04:28:37 2005.12.0.1
@@ -242,6 +242,8 @@ in decreasing order of importance:
Include at least one location per time zone rule set per country.
One such location is enough. Use ISO 3166 (see the file
iso3166.tab) to help decide whether something is a country.
+ However, uninhabited ISO 3166 regions like Bouvet Island
+ do not need locations, since local time is not defined there.
If all the clocks in a country's region have agreed since 1970,
don't bother to include more than one location
even if subregions' clocks disagreed before 1970.
===================================================================
RCS file: RCS/asia,v
retrieving revision 2005.12
retrieving revision 2005.12.0.1
diff -pu -r2005.12 -r2005.12.0.1
--- asia 2005/08/22 16:05:26 2005.12
+++ asia 2005/08/23 06:14:43 2005.12.0.1
@@ -43,8 +43,8 @@
# 8:00 CST China
# 9:00 CJT Central Japanese Time (1896/1937)*
# 9:00 EIT east Indonesia
-# 9:00 JST Japan
-# 9:00 KST Korea
+# 9:00 JST JDT Japan
+# 9:00 KST KDT Korea
# 9:30 CST (Australian) Central Standard Time
#
# See the `europe' file for Russia and Turkey in Asia.
@@ -846,14 +846,28 @@ Zone Asia/Jerusalem 2:20:56 - LMT 1880
# Today's _Asahi Evening News_ (page 4) reports that Japan had
# daylight saving between 1948 and 1951, but ``the system was discontinued
# because the public believed it would lead to longer working hours.''
+
+# From Mayumi Negishi in the 2005-08-10 Japan Times
+# <http://www.japantimes.co.jp/cgi-bin/getarticle.pl5?nn20050810f2.htm>:
+# Occupation authorities imposed daylight-saving time on Japan on
+# [1948-05-01].... But lack of prior debate and the execution of
+# daylight-saving time just three days after the bill was passed generated
+# deep hatred of the concept.... The Diet unceremoniously passed a bill to
+# dump the unpopular system in October 1951, less than a month after the San
+# Francisco Peace Treaty was signed. (A government poll in 1951 showed 53%
+# of the Japanese wanted to scrap daylight-saving time, as opposed to 30% who
+# wanted to keep it.)
+
# Shanks writes that daylight saving in Japan during those years was as follows:
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-#Rule Japan 1948 only - May Sun>=1 2:00 1:00 D
-#Rule Japan 1948 1951 - Sep Sat>=8 2:00 0 S
-#Rule Japan 1949 only - Apr Sun>=1 2:00 1:00 D
-#Rule Japan 1950 1951 - May Sun>=1 2:00 1:00 D
-# but the only locations using it were US military bases.
-# We go with Shanks and omit daylight saving in those years for Asia/Tokyo.
+Rule Japan 1948 only - May Sun>=1 2:00 1:00 D
+Rule Japan 1948 1951 - Sep Sat>=8 2:00 0 S
+Rule Japan 1949 only - Apr Sun>=1 2:00 1:00 D
+Rule Japan 1950 1951 - May Sun>=1 2:00 1:00 D
+# but the only locations using it (for birth certificates, presumably, since
+# Shanks's audience is astrologers) were US military bases. For now, assume
+# that for most purposes daylight-saving time was observed; otherwise, what
+# would have been the point of the 1951 poll?
# From Hideyuki Suzuki (1998-11-09):
# 'Tokyo' usually stands for the former location of Tokyo Astronomical
@@ -883,7 +897,7 @@ Zone Asia/Jerusalem 2:20:56 - LMT 1880
Zone Asia/Tokyo 9:18:59 - LMT 1887 Dec 31 15:00u
9:00 - JST 1896
9:00 - CJT 1938
- 9:00 - JST
+ 9:00 Japan J%sT
# Since 1938, all Japanese possessions have been like Asia/Tokyo.
# Jordan
===================================================================
RCS file: RCS/northamerica,v
retrieving revision 2005.12
retrieving revision 2005.12.0.2
diff -pu -r2005.12 -r2005.12.0.2
--- northamerica 2005/08/22 16:05:26 2005.12
+++ northamerica 2005/08/23 06:14:43 2005.12.0.2
@@ -110,6 +110,12 @@
#
# He had scored a 20-second scoop on other broadcasters.
+# From Arthur David Olson (2005-08-22):
+# Paul has been careful to use the "US" rules only in those locations
+# that are part of the United States; this reflects the real scope of
+# U.S. government action. So even though the "US" rules have changed
+# in the latest release, other countries won't be affected.
+
# 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
@@ -225,8 +231,8 @@ Rule US 2007 max - Nov Sun>=1 2:00 0 S
# US eastern time, represented by New York
# Connecticut, Delaware, District of Columbia, most of Florida,
-# Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and
-# Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts,
+# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
+# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
# New Hampshire, New Jersey, New York, North Carolina, Ohio,
# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
# Vermont, Virginia, West Virginia
@@ -481,27 +487,30 @@ Zone America/Boise -7:44:49 - LMT 1883 N
# For a map of Indiana's time zone regions, see:
# <a href="http://www.mccsc.edu/time.html">
# What time is it in Indiana?
-# </a> (1999-04-06)
+# </a> (2005-05-03)
+#
+# From Paul Eggert (2005-08-22):
+# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
+# with the following exceptions:
+#
+# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
+# Vandenburgh, and Warrick counties have been like America/Chicago.
+#
+# - Dearborn and Ohio counties have been like America/New_York.
+#
+# - Clark, Floyd, and Harrison counties have been like
+# America/Kentucky/Louisville.
+#
+# - Crawford, Starke, and Switzerland counties have their own time zone
+# histories as noted below.
#
-# 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.
# From Paul Eggert (2005-08-16):
# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006,
@@ -575,7 +584,7 @@ Zone America/Indiana/Vevay -5:40:16 - LM
-5:00 US E%sT
# Part of Kentucky left its clocks alone in 1974.
-# This also includes a part of Indiana immediately adjacent to Louisville.
+# This also includes Clark, Floyd, and Harrison counties in Indiana.
# 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
@@ -716,17 +725,6 @@ Zone America/Menominee -5:50:27 - LMT 18
# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
# Jimmy Skaggs, _The Great Guano Rush_ (1994).
-# 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
-
################################################################################
===================================================================
RCS file: RCS/backward,v
retrieving revision 2005.12
retrieving revision 2005.12.0.1
diff -pu -r2005.12 -r2005.12.0.1
--- backward 2005/08/22 16:05:26 2005.12
+++ backward 2005/08/23 04:28:37 2005.12.0.1
@@ -4,8 +4,8 @@
# and their old names. Many names changed in late 1993.
Link Africa/Bamako Africa/Timbuktu
-Link America/Adak America/Atka
Link America/Argentina/Catamarca America/Argentina/ComodRivadavia
+Link America/Adak America/Atka
Link America/Argentina/Buenos_Aires America/Buenos_Aires
Link America/Argentina/Catamarca America/Catamarca
Link America/Argentina/Cordoba America/Cordoba
@@ -23,9 +23,9 @@ Link Asia/Ashgabat Asia/Ashkhabad
Link Asia/Chongqing Asia/Chungking
Link Asia/Dhaka Asia/Dacca
Link Asia/Macau Asia/Macao
-Link Asia/Makassar Asia/Ujung_Pandang
Link Asia/Jerusalem Asia/Tel_Aviv
Link Asia/Thimphu Asia/Thimbu
+Link Asia/Makassar Asia/Ujung_Pandang
Link Asia/Ulaanbaatar Asia/Ulan_Bator
Link Australia/Sydney Australia/ACT
Link Australia/Sydney Australia/Canberra
@@ -42,6 +42,7 @@ Link America/Rio_Branco Brazil/Acre
Link America/Noronha Brazil/DeNoronha
Link America/Sao_Paulo Brazil/East
Link America/Manaus Brazil/West
+Link America/Chicago CST6CDT
Link America/Halifax Canada/Atlantic
Link America/Winnipeg Canada/Central
Link America/Regina Canada/East-Saskatchewan
@@ -54,6 +55,8 @@ Link America/Whitehorse Canada/Yukon
Link America/Santiago Chile/Continental
Link Pacific/Easter Chile/EasterIsland
Link America/Havana Cuba
+Link America/Panama EST
+Link America/New_York EST5EDT
Link Africa/Cairo Egypt
Link Europe/Dublin Eire
Link Europe/London Europe/Belfast
@@ -64,6 +67,7 @@ Link Etc/GMT GMT+0
Link Etc/GMT GMT-0
Link Etc/GMT GMT0
Link Etc/GMT Greenwich
+Link Pacific/Honolulu HST
Link Asia/Hong_Kong Hongkong
Link Atlantic/Reykjavik Iceland
Link Asia/Tehran Iran
@@ -72,17 +76,20 @@ Link America/Jamaica Jamaica
Link Asia/Tokyo Japan
Link Pacific/Kwajalein Kwajalein
Link Africa/Tripoli Libya
+Link America/Phoenix MST
+Link America/Denver MST7MDT
Link America/Tijuana Mexico/BajaNorte
Link America/Mazatlan Mexico/BajaSur
Link America/Mexico_City Mexico/General
-Link America/Denver Navajo
Link Pacific/Auckland NZ
Link Pacific/Chatham NZ-CHAT
+Link America/Denver Navajo
+Link Asia/Shanghai PRC
+Link America/Los_Angeles PST8PDT
Link Pacific/Pago_Pago Pacific/Samoa
Link Pacific/Truk Pacific/Yap
Link Europe/Warsaw Poland
Link Europe/Lisbon Portugal
-Link Asia/Shanghai PRC
Link Asia/Taipei ROC
Link Asia/Seoul ROK
Link Asia/Singapore Singapore
@@ -92,7 +99,7 @@ Link America/Anchorage US/Alaska
Link America/Adak US/Aleutian
Link America/Phoenix US/Arizona
Link America/Chicago US/Central
-Link America/Indianapolis US/East-Indiana
+Link America/Indiana/Indianapolis US/East-Indiana
Link America/New_York US/Eastern
Link Pacific/Honolulu US/Hawaii
Link America/Indiana/Knox US/Indiana-Starke
===================================================================
RCS file: RCS/tz-link.htm,v
retrieving revision 2005.12
retrieving revision 2005.12.0.1
diff -pu -r2005.12 -r2005.12.0.1
--- tz-link.htm 2005/08/22 16:05:26 2005.12
+++ tz-link.htm 2005/08/23 06:14:43 2005.12.0.1
@@ -62,13 +62,13 @@ Locations are identified by continent or
the location, which is typically the largest city within the region.
For example, <code>America/New_York</code>
represents most of the <abbr title="United States">US</abbr> eastern time zone;
-<code>America/Indianapolis</code> represents most of Indiana, which
-uses eastern time without daylight saving time (<abbr
+<code>America/Phoenix</code> represents most of Arizona, which
+uses mountain time without daylight saving time (<abbr
title="daylight saving time">DST</abbr>);
<code>America/Detroit</code> represents most of Michigan, which uses
eastern time but with different <abbr>DST</abbr> rules in 1975;
and other entries represent smaller regions like Starke County,
-Kentucky, which switched from central to eastern time in 1991.
+Indiana, which switched from central to eastern time in 1991.
To use the database on an extended <a
href="http://en.wikipedia.org/wiki/POSIX"><abbr
title="Portable Operating System Interface">POSIX</abbr></a>
===================================================================
RCS file: RCS/tz-art.htm,v
retrieving revision 2005.10
retrieving revision 2005.10.0.1
diff -pu -r2005.10 -r2005.10.0.1
--- tz-art.htm 2005/07/14 18:13:40 2005.10
+++ tz-art.htm 2005/08/23 06:14:43 2005.10.0.1
@@ -177,7 +177,7 @@ An on-line English-language translation
<tr><td>Film</td><td>Bell Science - About Time</td></tr>
<tr><td>Notes</td><td>The Frank Baxter/Richard Deacon extravaganza
Information on ordering is available at
-<a href="http://www.videoflicks.com/VF2/1035/1035893.ihtml">http://www.videoflicks.com/VF2/1035/1035893.ihtml</a></td></tr>
+<a href="http://www.videoflicks.com/titles/1035/1035893.htm">http://www.videoflicks.com/titles/1035/1035893.htm</a></td></tr>
</table>
<hr />
<ul>
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