From: Sascha Wildner Date: Tue, 25 Jan 2011 01:34:41 +0000 (+0100) Subject: Sync zoneinfo database with tzdata2011a from elsie.nci.nih.gov X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/3bc68d050d4d3ff01b1f354b58c76b418da68200 Sync zoneinfo database with tzdata2011a from elsie.nci.nih.gov australasia: 8.20 -> 8.22 northamerica: 8.34 -> 8.39 Theory: 8.5 -> 8.6 * australasia: Simplification and gratuitous optimization of South Australia rules. * northamerica: Changes to Hawaiian time history (from an article by Schmitt and Cox): abandoned local mean time in 1896 rather than 1900; used DST during World War II. * Theory: Add section on scope of the database. --- diff --git a/share/zoneinfo/Theory b/share/zoneinfo/Theory index b1e6bd5c9d..be03e4a48d 100644 --- a/share/zoneinfo/Theory +++ b/share/zoneinfo/Theory @@ -1,11 +1,12 @@ -@(#)Theory 8.5 +@(#)Theory 8.6 This file is in the public domain, so clarified as of 2009-05-17 by Arthur David Olson. ----- Outline ----- Time and date functions - Names of time zone regions + Scope of the tz database + Names of time zone rule files Time zone abbreviations Calendrical issues Time and time zones on Mars @@ -192,6 +193,31 @@ more powerful time conversion functions can be standardized, so much the better. +----- Scope of the tz database ----- + +The tz database attempts to record the history and predicted future of +all computer-based clocks that track civil time. To represent this +data, the world is partitioned into regions whose clocks all agree +about time stamps that occur after the somewhat-arbitrary cutoff point +of the POSIX Epoch (1970-01-01 00:00:00 UTC). For each such region, +the database records all known clock transitions, and labels the region +with a notable location. + +Clock transitions before 1970 are recorded for each such location, +because most POSIX-compatible systems support negative time stamps and +could misbehave if data were omitted for pre-1970 transitions. +However, the database is not designed for and does not suffice for +applications requiring accurate handling of all past times everywhere, +as it would take far too much effort and guesswork to record all +details of pre-1970 civil timekeeping. + +As noted in the README file, the tz database is not authoritative +(particularly not for pre-1970 time stamps), and it surely has errors. +Corrections are welcome and encouraged. Users requiring authoritative +data should consult national standards bodies and the references cited +in the database's comments. + + ----- Names of time zone rule files ----- The time zone rule file naming conventions attempt to strike a balance diff --git a/share/zoneinfo/australasia b/share/zoneinfo/australasia index 8f45fd95ff..0126fd447d 100644 --- a/share/zoneinfo/australasia +++ b/share/zoneinfo/australasia @@ -1,5 +1,5 @@ # 
-# @(#)australasia	8.20
+# @(#)australasia	8.22
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
@@ -84,14 +84,13 @@ Rule	AS	1986	only	-	Oct	19	2:00s	1:00	-
 Rule	AS	1987	2007	-	Oct	lastSun	2:00s	1:00	-
 Rule	AS	1972	only	-	Feb	27	2:00s	0	-
 Rule	AS	1973	1985	-	Mar	Sun>=1	2:00s	0	-
-Rule	AS	1986	1989	-	Mar	Sun>=15	2:00s	0	-
-Rule	AS	1990	only	-	Mar	Sun>=18	2:00s	0	-
-Rule	AS	1991	only	-	Mar	Sun>=1	2:00s	0	-
-Rule	AS	1992	only	-	Mar	Sun>=18	2:00s	0	-
-Rule	AS	1993	only	-	Mar	Sun>=1	2:00s	0	-
-Rule	AS	1994	only	-	Mar	Sun>=18	2:00s	0	-
+Rule	AS	1986	1990	-	Mar	Sun>=15	2:00s	0	-
+Rule	AS	1991	only	-	Mar	3	2:00s	0	-
+Rule	AS	1992	only	-	Mar	22	2:00s	0	-
+Rule	AS	1993	only	-	Mar	7	2:00s	0	-
+Rule	AS	1994	only	-	Mar	20	2:00s	0	-
 Rule	AS	1995	2005	-	Mar	lastSun	2:00s	0	-
-Rule	AS	2006	only	-	Apr	Sun>=1	2:00s	0	-
+Rule	AS	2006	only	-	Apr	2	2:00s	0	-
 Rule	AS	2007	only	-	Mar	lastSun	2:00s	0	-
 Rule	AS	2008	max	-	Apr	Sun>=1	2:00s	0	-
 Rule	AS	2008	max	-	Oct	Sun>=1	2:00s	1:00	-
diff --git a/share/zoneinfo/northamerica b/share/zoneinfo/northamerica
index 2d21d40ee3..201e09e4a8 100644
--- a/share/zoneinfo/northamerica
+++ b/share/zoneinfo/northamerica
@@ -1,5 +1,5 @@
 # 
-# @(#)northamerica	8.34
+# %W%
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
@@ -471,20 +471,50 @@ Zone America/Adak	 12:13:21 -	LMT	1867 Oct 18
 #  three votes for and one against."
 
 # 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
+
+# From Arthur David Olson (2010-12-09):
+# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
+# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
+# the article is available at
+# 
+# http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
+# 
+# and indicates that standard time was adopted effective noon, January
+# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
+# saving for the period between the last Sunday of each April and the
+# last Sunday of each September, but less than a month later repealed the
+# act," (page 220), that year-round daylight saving time was in effect
+# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
+# when clocks changed) and that clocks were changed by 30 minutes
+# effective the second Sunday of June, 1947 (page 219, with no time of
+# day given for when clocks changed). A footnote for the 1933 changes
+# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
+# and Act 163 (approved 21 May 1933)."
+
+# From Arthur David Olson (2011-01-19):
+# The following is from "Laws of the Territory of Hawaii Passed by the
+# Seventeenth Legislature: Regular Session 1933," available (as of
+# 2011-01-19) at American University's Pence Law Library. Page 85: "Act
+# 90...At 2 o'clock ante meridian of the last Sunday in April of each
+# year, the standard time of this Territory shall be advanced one
+# hour...This Act shall take effect upon its approval. Approved this 26th
+# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
+# Hawaii." Page 172:  "Act 163...Act 90 of the Session Laws of 1933 is
+# hereby repealed...This Act shall take effect upon its approval, upon
+# which date the standard time of this Territory shall be restored to
+# that existing immediately prior to the taking effect of said Act 90.
+# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
+# of the Territory of Hawaii."
+#
+# Note that 1933-05-21 was a Sunday.
+# We're left to guess the time of day when Act 163 was approved; guess noon.
+
+Zone Pacific/Honolulu	-10:31:26 -	LMT	1896 Jan 13 12:00 #Schmitt&Cox
+			-10:30	-	HST	1933 Apr 30 2:00 #Laws 1933
+			-10:30	1:00	HDT	1933 May 21 12:00 #Laws 1933+12
+			-10:30	-	HST	1942 Feb 09 2:00 #Schmitt&Cox+2
+			-10:30	1:00	HDT	1945 Sep 30 2:00 #Schmitt&Fox+2
+			-10:30	US	H%sT	1947 Jun  8 2:00 #Schmitt&Fox+2
 			-10:00	-	HST
 
 # Now we turn to US areas that have diverged from the consensus since 1970.