proposed tz changes for Turkey, Indiana, Easter I., zic.8, URLs

Paul Eggert eggert at CS.UCLA.EDU
Thu Feb 22 17:45:06 UTC 2007 

Here are proposed changes for the tz database.  The most pressing
changes are for Turkey and Pulaski County, Indiana, as they affect
clock transitions next month.

* Turkey switches at 01:00 standard time, not at 01:00 UTC.  (Thanks to
  Amar Devegowda and Steffen Thorsen for this.)

* Pulaski County, Indiana, is switching from CST/CDT to EST/EDT next
  month (which means a 2-hour change on March 11).  This requires a
  new Zone, America/Indiana/Winamac.  (Thanks to Gwillim Law for the
  heads-up.)

* A slight correction to Easter Island Mean Time (1890-1932).

* Update comments for Canada.  (Thanks to Chris Walton.)

* Add an example to the zic man page, to help explain things a bit better.

* Add URLs to http://www.calconnect.org/dstlinks.html and to
  http://www.chronos-st.org/.

===================================================================
RCS file: RCS/zic.8,v
retrieving revision 2006.13
retrieving revision 2006.13.0.1
diff -u -r2006.13 -r2006.13.0.1
--- zic.8	2006/10/02 19:32:10	2006.13
+++ zic.8	2007/01/12 23:32:22	2006.13.0.1
@@ -411,6 +411,63 @@
 .q Rolling
 if the leap second time given by the other fields should be interpreted as
 local wall clock time.
+.SH "EXTENDED EXAMPLE"
+Here is an extended example of
+.I zic
+input, intended to illustrate many of its features.
+.br
+.ne 22
+.nf
+.in +2m
+.ta \w'# Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'1973\0\0'u +\w'TYPE\0\0'u +\w'Apr\0\0'u +\w'lastSun\0\0'u +\w'2:00\0\0'u +\w'SAVE\0\0'u
+.sp
+# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+Rule	Swiss	1940	only	-	Nov	2	0:00	1:00	S
+Rule	Swiss	1940	only	-	Dec	31	0:00	0	-
+Rule	Swiss	1941	1942	-	May	Sun>=1	2:00	1:00	S
+Rule	Swiss	1941	1942	-	Oct	Sun>=1	0:00	0
+.sp .5
+Rule	EU	1977	1980	-	Apr	Sun>=1	1:00u	1:00	S
+Rule	EU	1977	only	-	Sep	lastSun	1:00u	0	-
+Rule	EU	1978	only	-	Oct	 1	1:00u	0	-
+Rule	EU	1979	1995	-	Sep	lastSun	1:00u	0	-
+Rule	EU	1981	max	-	Mar	lastSun	1:00u	1:00	S
+Rule	EU	1996	max	-	Oct	lastSun	1:00u	0	-
+.sp
+.ta \w'# Zone\0\0'u +\w'Europe/Zurich\0\0'u +\w'0:34:08\0\0'u +\w'RULES/SAVE\0\0'u +\w'FORMAT\0\0'u
+# Zone	NAME	GMTOFF	RULES	FORMAT	UNTIL
+Zone	Europe/Zurich	0:34:08	-	LMT	1848 Sep 12
+		0:29:44	-	BMT	1894 Jun
+		1:00	Swiss	CE%sT	1981
+		1:00	EU	CE%sT
+.sp
+Link	Europe/Zurich	Switzerland
+.sp
+.in
+.fi
+In this example, the zone is named Europe/Zurich but it has an alias
+as Switzerland.  Zurich was 34 minutes and 8 seconds west of GMT until
+1848-09-12 at 00:00, when the offset changed to 29 minutes and 44
+seconds.  After 1894-06-01 at 00:00 Swiss daylight saving rules (defined
+with lines beginning with "Rule Swiss") apply, and the GMT offset
+became one hour.  From 1981 to the present, EU daylight saving rules have
+applied, and the UTC offset has remained at one hour.
+.PP
+In 1940, daylight saving time applied from November 2 at 00:00 to
+December 31 at 00:00.  In 1941 and 1942, daylight saving time applied
+from the first Sunday in May at 02:00 to the first Sunday in October
+at 00:00.
+The pre-1981 EU daylight-saving rules have no effect
+here, but are included for completeness.  Since 1981, daylight
+saving has begun on the last Sunday in March at 01:00 UTC.
+Until 1995 it ended the last Sunday in September at 01:00 UTC,
+but this changed to the last Sunday in October starting in 1996.
+.PP
+For purposes of
+display, "LMT" and "BMT" were initially used, respectively.  Since
+Swiss rules and later EU rules were applied, the display name for the
+timezone has been CET for standard time and CEST for daylight saving
+time.
 .SH NOTES
 For areas with more than two types of local time,
 you may need to use local standard time in the
===================================================================
RCS file: RCS/europe,v
retrieving revision 2007.1
retrieving revision 2007.1.0.1
diff -u -r2007.1 -r2007.1.0.1
--- europe	2007/01/08 17:17:29	2007.1
+++ europe	2007/01/14 06:13:53	2007.1.0.1
@@ -2278,6 +2278,24 @@
 			1:00	EU	CE%sT
 
 # Turkey
+
+# From Amar Devegowda (2007-01-03):
+# The time zone rules for Istanbul, Turkey have not been changed for years now.
+# ... The latest rules are available at -
+# http://www.timeanddate.com/worldclock/timezone.html?n=107
+# From Steffen Thorsen (2007-01-03):
+# I have been able to find press records back to 1996 which all say that
+# DST started 01:00 local time and end at 02:00 local time.  I am not sure
+# what happened before that.  One example for each year from 1996 to 2001:
+# http://newspot.byegm.gov.tr/arsiv/1996/21/N4.htm
+# http://www.byegm.gov.tr/YAYINLARIMIZ/CHR/ING97/03/97X03X25.TXT
+# http://www.byegm.gov.tr/YAYINLARIMIZ/CHR/ING98/03/98X03X02.HTM
+# http://www.byegm.gov.tr/YAYINLARIMIZ/CHR/ING99/10/99X10X26.HTM#%2016
+# http://www.byegm.gov.tr/YAYINLARIMIZ/CHR/ING2000/03/00X03X06.HTM#%2021
+# http://www.byegm.gov.tr/YAYINLARIMIZ/CHR/ING2001/03/23x03x01.HTM#%2027
+# From Paul Eggert (2007-01-03):
+# Prefer the above source to Shanks & Pottenger for time stamps after 1990.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Turkey	1916	only	-	May	 1	0:00	1:00	S
 Rule	Turkey	1916	only	-	Oct	 1	0:00	0	-
@@ -2332,14 +2350,17 @@
 Rule	Turkey	1983	only	-	Oct	 2	0:00	0	-
 Rule	Turkey	1985	only	-	Apr	20	0:00	1:00	S
 Rule	Turkey	1985	only	-	Sep	28	0:00	0	-
+Rule	Turkey	1986	1990	-	Mar	lastSun	2:00s	1:00	S
+Rule	Turkey	1986	1990	-	Sep	lastSun	2:00s	0	-
+Rule	Turkey	1991	max	-	Mar	lastSun	1:00s	1:00	S
+Rule	Turkey	1991	1995	-	Sep	lastSun	1:00s	0	-
+Rule	Turkey	1996	max	-	Oct	lastSun	1:00s	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Istanbul	1:55:52 -	LMT	1880
 			1:56:56	-	IMT	1910 Oct # Istanbul Mean Time?
 			2:00	Turkey	EE%sT	1978 Oct 15
 			3:00	Turkey	TR%sT	1985 Apr 20 # Turkey Time
-			2:00	Turkey	EE%sT	1986
-			2:00	C-Eur	EE%sT	1991
-			2:00	EU	EE%sT
+			2:00	Turkey	EE%sT
 Link	Europe/Istanbul	Asia/Istanbul	# Istanbul is in both continents.
 
 # Ukraine
===================================================================
RCS file: RCS/northamerica,v
retrieving revision 2007.1
retrieving revision 2007.1.0.1
diff -u -r2007.1 -r2007.1.0.1
--- northamerica	2007/01/08 17:17:29	2007.1
+++ northamerica	2007/02/12 06:52:32	2007.1.0.1
@@ -583,6 +583,11 @@
 # clocks twice that night, but this obviously is in error.  The intent
 # is that 01:59:59 EST be followed by 02:00:00 CDT.
 
+# From Gwillim Law (2007-02-10):
+# The Associated Press has been reporting that Pulaski County, Indiana is
+# going to switch from Central to Eastern Time on March 11, 2007....
+# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
+
 # 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
@@ -618,7 +623,7 @@
 			-5:00	-	EST	2006
 			-5:00	US	E%sT
 #
-# Daviess, Dubois, Knox, Martin, Perry, and Pulaski Counties, Indiana,
+# Daviess, Dubois, Knox, Martin, and Perry Counties, Indiana,
 # switched from eastern to central time in April 2006.
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER
 Rule Vincennes	1946	only	-	Apr	lastSun	2:00	1:00	D
@@ -676,6 +681,23 @@
 			-5:00	-	EST	2006 Apr  2 2:00
 			-6:00	US	C%sT
 #
+# Pulaski County, Indiana, switched from eastern to central time in
+# April 2006 and then switched back in March 2007.
+# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER
+Rule	Pulaski	1946	1960	-	Apr	lastSun	2:00	1:00	D
+Rule	Pulaski	1946	1954	-	Sep	lastSun	2:00	0	S
+Rule	Pulaski	1955	1956	-	Oct	lastSun	2:00	0	S
+Rule	Pulaski	1957	1960	-	Sep	lastSun	2:00	0	S
+# Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+Zone America/Indiana/Winamac -5:46:25 - LMT	1883 Nov 18 12:13:35
+			-6:00	US	C%sT	1946
+			-6:00	Pulaski	C%sT	1961 Apr 30 2:00
+			-5:00	-	EST	1969
+			-5:00	US	E%sT	1971
+			-5:00	-	EST	2006 Apr  2 2:00
+			-6:00	US	C%sT	2007 Mar 11 2:00
+			-5:00	US	E%sT
+#
 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Vevay -5:40:16 -	LMT	1883 Nov 18 12:19:44
@@ -894,18 +916,16 @@
 # Unless otherwise specified, the data for Canada are all from Shanks
 # & Pottenger.
 
-# From Chris Walton (2006-04-01):
+# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31):
 # The British Columbia government announced yesterday that it will
 # adjust daylight savings next year to align with changes in the
 # U.S. and the rest of Canada....
 # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
-
-# From Chris Walton (2006-04-25):
+# ...
+# Nova Scotia
 # Daylight saving time will be extended by four weeks starting in 2007....
-# Here is a news release which was issued today by the Nova Scotia government:
-# http://www.gov.ns.ca/news/details.asp?id=20060425004
-
-# From Chris Walton (2006-06-26):
+# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
+#
 # [For New Brunswick] the new legislation dictates that the time change is to
 # be done at 02:00 instead of 00:01.
 # http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
@@ -915,16 +935,18 @@
 # http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
 # ...
 # [Alberta, Ontario, Quebec] will follow US rules.
-# http://www.qp.gov.ab.ca/documents/Acts/2006CH03_UNPR.cfm?frm_isbn=0779744934
+# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
-# http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm
+# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
 # ...
-# P.E.I. will follow US rules.  The new legislation is not law yet.
-# It passed first reading on April 20....
-# http://www.assembly.pe.ca/bills/pdf_first/62/3/bill-101.pdf
+# P.E.I. will follow US rules....
+# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
 # ...
-# Province of Newfoundland and Labrador.... The change is being considered.
-# http://www.releases.gov.nl.ca/releases/2006/mpa/0331n01.htm
+# Province of Newfoundland and Labrador....
+# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
+# ...
+# Yukon
+# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
 # ...
 # N.W.T. will follow US rules.  Whoever maintains the government web site
 # does not seem to believe in bookmarks.  To see the news release, click the
@@ -932,7 +954,14 @@
 # "Daylight Savings Time Change" link; it will fire off a popup using
 # JavaScript.
 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
-
+# ...
+# No formal announcement has been made from the Nunavut Government.
+# The premier of Nunavut claimed in August of 2005 that he did not
+# want to touch the issue; nothing more has been heard since.  It is
+# likely Nunavut will eventually follow the rest of the country but
+# there will certainly be confusion on March 11/2007 if no formal
+# announcement is made.  Currently the TZ database and Microsoft make
+# assumptions that Nunavut will follow the rest of the country.
 
 
 # From Paul Eggert (2006-04-25):
@@ -1100,11 +1129,11 @@
 
 # New Brunswick
 
-# From Paul Eggert (2006-01-20):
-# New Brunswick's Time Definition Act
-# <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> says they change at 00:01, and
+# From Paul Eggert (2007-01-31):
+# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
+# says they changed at 00:01 through 2006, and
 # <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
-# clear that this has been the case since at least 1993.
+# clear that this was the case since at least 1993.
 # For now, assume it started in 1993.
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
@@ -1676,10 +1705,6 @@
 # For lack of better information, assume that Southampton Island observed
 # daylight saving only during wartime.
 
-# From Chris Walton (2006-07-19):
-# The government of Yukon Territory ... recently announced it will extend
-# daylight saving in 2007....  http://www.gov.yk.ca/news/2006/06-164.html
-
 # 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
===================================================================
RCS file: RCS/southamerica,v
retrieving revision 2007.1
retrieving revision 2007.1.0.1
diff -u -r2007.1 -r2007.1.0.1
--- southamerica	2007/01/08 17:26:20	2007.1
+++ southamerica	2007/01/14 06:16:11	2007.1.0.1
@@ -765,7 +765,7 @@
 			-5:00	Chile	CL%sT	1947 May 22 # Chile Time
 			-4:00	Chile	CL%sT
 Zone Pacific/Easter	-7:17:44 -	LMT	1890
-			-7:17:44 -	EMT	1932 Sep    # Easter Mean Time
+			-7:17:28 -	EMT	1932 Sep    # Easter Mean Time
 			-7:00	Chile	EAS%sT	1982 Mar 13 21:00 # Easter I Time
 			-6:00	Chile	EAS%sT
 #
===================================================================
RCS file: RCS/zone.tab,v
retrieving revision 2007.1
retrieving revision 2007.1.0.1
diff -u -r2007.1 -r2007.1.0.1
--- zone.tab	2007/01/08 17:28:11	2007.1
+++ zone.tab	2007/02/12 06:51:56	2007.1.0.1
@@ -379,11 +379,12 @@
 US	+381515-0854534	America/Kentucky/Louisville	Eastern Time - Kentucky - Louisville area
 US	+364947-0845057	America/Kentucky/Monticello	Eastern Time - Kentucky - Wayne County
 US	+394606-0860929	America/Indiana/Indianapolis	Eastern Time - Indiana - most locations
-US	+382232-0862041	America/Indiana/Marengo	Eastern Time - Indiana - Crawford County
 US	+411745-0863730	America/Indiana/Knox	Eastern Time - Indiana - Starke County
+US	+410305-0863611	America/Indiana/Winamac	Eastern Time - Indiana - Pulaski County
+US	+382232-0862041	America/Indiana/Marengo	Eastern Time - Indiana - Crawford County
 US	+384452-0850402	America/Indiana/Vevay	Eastern Time - Indiana - Switzerland County
 US	+415100-0873900	America/Chicago	Central Time
-US	+384038-0873143	America/Indiana/Vincennes	Central Time - Indiana - Daviess, Dubois, Knox, Martin, Perry & Pulaski Counties
+US	+384038-0873143	America/Indiana/Vincennes	Central Time - Indiana - Daviess, Dubois, Knox, Martin & Perry Counties
 US	+382931-0871643	America/Indiana/Petersburg	Central Time - Indiana - Pike County
 US	+450628-0873651	America/Menominee	Central Time - Michigan - Dickinson, Gogebic, Iron & Menominee Counties
 US	+470659-1011757	America/North_Dakota/Center	Central Time - North Dakota - Oliver County
===================================================================
RCS file: RCS/tz-link.htm,v
retrieving revision 2007.1
retrieving revision 2007.1.0.1
diff -u -r2007.1 -r2007.1.0.1
--- tz-link.htm	2007/01/08 17:17:29	2007.1
+++ tz-link.htm	2007/02/22 17:31:50	2007.1.0.1
@@ -8,7 +8,7 @@
 <meta http-equiv="Content-type" content='text/html; charset="US-ASCII"'>
 <meta name="DC.Creator" content="Eggert, Paul">
 <meta name="DC.Contributor" content="Olson, Arthur David">
-<meta name="DC.Date" content="2007-01-02">
+<meta name="DC.Date" content="2007-02-22">
 <meta name="DC.Description"
  content="Sources of information about time zones and daylight saving time">
 <meta name="DC.Identifier" content="http://www.twinsun.com/tz/tz-link.htm">
@@ -152,6 +152,9 @@
 href="http://www.calconnect.org/publications/icalendartimezoneproblemsandrecommendationsv1.0.pdf">iCalendar
 TIMEZONE Problems and Recommendations</a> offers guidelines and
 recommendations for the use of VTIMEZONE and <code>tz</code>.</li>
+<li><a href="http://www.calconnect.org/dstlinks.html">Extended Daylight
+Saving Time Links, Advisories and Changes</a> lists vendor material on recent
+daylight saving time changes.</li>
 <li><a
 href="http://www.calconnect.org/publications/timezoneregistryandservicerecommendationsv1.0.pdf">Timezone
 Registry and Service Recommendations</a> discusses a
@@ -216,6 +219,13 @@
 <a href="http://www.ruby-lang.org/">Ruby</a>.
 It is freely available under the <abbr
 title="Massachusetts Institute of Technology">MIT</abbr> license.</li>
+<li>The <a href="http://www.chronos-st.org/">Chronos Date/Time
+Library</a> is a <a href="http://smalltalk.org/">Smalltalk</a> class
+library that compiles <code>tz</code> source into a <a
+href="http://date-time-zone.com/">time zone repository</a> whose format
+is either proprietary or an <a href="http://www.w3.org/XML/"><abbr
+title="Extensible Markup Language">XML</abbr></a>-encoded
+representation.</li>
 <li>Starting with version 8.5, <a href="http://www.tcl.tk/">Tcl</a>
 contains a developer-oriented parser that compiles <samp>tz</samp>
 source into text files, along with a runtime that can read those
@@ -543,11 +553,9 @@
 8601:2004 -- Data elements and interchange formats -- Information
 interchange -- Representation of dates and times</a>.</li>
 <li>
-<a href="http://www.w3.org/TR/xmlschema-2/#dateTime"><abbr
-title="Extensible Markup Language">XML</abbr>
+<a href="http://www.w3.org/TR/xmlschema-2/#dateTime"><abbr>XML</abbr>
 Schema: Datatypes - dateTime</a> specifies a format inspired by
-<abbr>ISO</abbr> 8601 that is in common use in <a
-href="http://www.w3.org/XML/"><abbr>XML</abbr></a> data.</li>
+<abbr>ISO</abbr> 8601 that is in common use in XML data.</li>
 <li>
 <a href="ftp://ftp.rfc-editor.org/in-notes/rfc2822.txt">Internet <abbr
 title="Request For Comments">RFC</abbr> 2822</a> &sect;3.3
===================================================================
RCS file: RCS/zic.c,v
retrieving revision 2007.2
retrieving revision 2007.2.0.1
diff -u -r2007.2 -r2007.2.0.1
--- zic.c	2007/02/12 14:33:57	2007.2
+++ zic.c	2007/02/20 23:31:30	2007.2.0.1
@@ -2644,7 +2644,7 @@
 
 static int
 mkdirs(argname)
-char * const	argname;
+char *		argname;
 {
 	register char *	name;
 	register char *	cp;

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