Date: Mon, 22 Aug 2005 10:49:55 -0700 From: Eric Fischer <enf@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>