[tz] [PATCH 0/2] Follow Australian common usage and update CST/CST to CST/CDT and EST/EST to EST/EDT etc [SEC=UNCLASSIFIED]
Paul Eggert
eggert at cs.ucla.edu
Mon Jun 30 07:46:55 UTC 2014
On 2013-04-12 Russ Allbery wrote:
> I'm increasingly of the opinion that the tz database should just use the
> most unambiguous abbreviations (AEST/AEDT) even if there isn't a clear
> consensus in general usage.
I am tempted to agree, particularly since (prompted by Rich Tibbett's
proposed patch on github) I finally got around to surveying general
usage and it appears that there is a working (though by no means
universal) consensus in Australia to use abbreviations like "AEST" and
"AEDT", and furthmore, we appear to have been mistaken in our
assumptions about abbreviation usage in the past. Details are in the
attached proposed patch, which I've pushed into the experimental tz
version on github. I couldn't resist adding a quote about the
daylight-saving preferences of "chuckleheaded Queenslanders and
straw-chewing yokels from the West".
-------------- next part --------------
From 62df86e10cb45ed931850f7298fa063ffea07544 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Mon, 30 Jun 2014 00:35:15 -0700
Subject: [PATCH] Use AEST/AEDT etc. instead of EST etc. for Australian
abbreviations.
* NEWS, australasia (Aus, Australia/Darwin, AW, Australia/Perth)
(Australia/Eucla, AQ, Holiday, Australia/Brisbane, Australia/Lindeman)
(AS, Australia/Adelaide, AT, Australia/Hobart, Australia/Currie, AV)
(Australia/Melbourne, AN, Australia/Sydney, Australia/Broken_Hill)
(LH, Australia/Lord_Howe, Antarctica/Macquarie):
Prefix Australian time zone abbreviations with "A", and switch
from "ST" to "DT" to denote daylight saving time. (Thanks to Ian
Abbott, Russ Allbery, Timothy Arceri, Alan Barrett, Stuart Bishop,
Shaun Bouckaert, Stephen Colebourne, Tobias Conradi, Mark Davis,
Robert Elz, Clive D.W. Feather, Dennis Ferguson, Edwin Groothuis,
Guy Harris, John Hawkinson, John Haxby, Brian Inglis, Paul Koning,
Kevin Lyda, Curtis Manwaring, Alan Mintz, Arthur David Olson, Matt
Paine, David Patte, Tim Parenti, random832, Derick Rethans, SM,
Peter Stagg, Rich Tibbett, Bennett Todd, and Garrett Wollman for
their contributions to this topic.)
---
NEWS | 10 ++
australasia | 510 +++++++++++++++++++++++++++++++-----------------------------
2 files changed, 275 insertions(+), 245 deletions(-)
diff --git a/NEWS b/NEWS
index 162a113..05a7063 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,16 @@ News for the tz database
Unreleased, experimental changes
+ Changes affecting time zone abbreviations
+
+ Australian eastern time zone abbreviations are now AEST/AEDT not EST,
+ and similarly for the other Australian zones. That is, for eastern
+ standard and daylight saving time the abbreviations are AEST and AEDT
+ instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
+ and AWST/AWDT are now used instead of the former CST, CWST, and WST.
+ This change does not affect UTC offsets, only time zone abbreviations.
+ (Thanks to Rich Tibbett and many others.)
+
Changes affecting past time stamps
Finland's 1942 fall-back transition was October 4 at 01:00, not
diff --git a/australasia b/australasia
index 1cb34a3..69f61f1 100644
--- a/australasia
+++ b/australasia
@@ -12,13 +12,13 @@
# Please see the notes below for the controversy about "EST" versus "AEST" etc.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule Aus 1917 only - Jan 1 0:01 1:00 -
-Rule Aus 1917 only - Mar 25 2:00 0 -
-Rule Aus 1942 only - Jan 1 2:00 1:00 -
-Rule Aus 1942 only - Mar 29 2:00 0 -
-Rule Aus 1942 only - Sep 27 2:00 1:00 -
-Rule Aus 1943 1944 - Mar lastSun 2:00 0 -
-Rule Aus 1943 only - Oct 3 2:00 1:00 -
+Rule Aus 1917 only - Jan 1 0:01 1:00 D
+Rule Aus 1917 only - Mar 25 2:00 0 S
+Rule Aus 1942 only - Jan 1 2:00 1:00 D
+Rule Aus 1942 only - Mar 29 2:00 0 S
+Rule Aus 1942 only - Sep 27 2:00 1:00 D
+Rule Aus 1943 1944 - Mar lastSun 2:00 0 S
+Rule Aus 1943 only - Oct 3 2:00 1:00 D
# Go with Whitman and the Australian National Standards Commission, which
# says W Australia didn't use DST in 1943/1944. Ignore Whitman's claim that
# 1944/1945 was just like 1943/1944.
@@ -26,26 +26,26 @@ Rule Aus 1943 only - Oct 3 2:00 1:00 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
# Northern Territory
Zone Australia/Darwin 8:43:20 - LMT 1895 Feb
- 9:00 - CST 1899 May
- 9:30 Aus CST
+ 9:00 - ACST 1899 May
+ 9:30 Aus AC%sT
# Western Australia
#
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule AW 1974 only - Oct lastSun 2:00s 1:00 -
-Rule AW 1975 only - Mar Sun>=1 2:00s 0 -
-Rule AW 1983 only - Oct lastSun 2:00s 1:00 -
-Rule AW 1984 only - Mar Sun>=1 2:00s 0 -
-Rule AW 1991 only - Nov 17 2:00s 1:00 -
-Rule AW 1992 only - Mar Sun>=1 2:00s 0 -
-Rule AW 2006 only - Dec 3 2:00s 1:00 -
-Rule AW 2007 2009 - Mar lastSun 2:00s 0 -
-Rule AW 2007 2008 - Oct lastSun 2:00s 1:00 -
+Rule AW 1974 only - Oct lastSun 2:00s 1:00 D
+Rule AW 1975 only - Mar Sun>=1 2:00s 0 S
+Rule AW 1983 only - Oct lastSun 2:00s 1:00 D
+Rule AW 1984 only - Mar Sun>=1 2:00s 0 S
+Rule AW 1991 only - Nov 17 2:00s 1:00 D
+Rule AW 1992 only - Mar Sun>=1 2:00s 0 S
+Rule AW 2006 only - Dec 3 2:00s 1:00 D
+Rule AW 2007 2009 - Mar lastSun 2:00s 0 S
+Rule AW 2007 2008 - Oct lastSun 2:00s 1:00 D
Zone Australia/Perth 7:43:24 - LMT 1895 Dec
- 8:00 Aus WST 1943 Jul
- 8:00 AW WST
+ 8:00 Aus AW%sT 1943 Jul
+ 8:00 AW AW%sT
Zone Australia/Eucla 8:35:28 - LMT 1895 Dec
- 8:45 Aus CWST 1943 Jul
- 8:45 AW CWST
+ 8:45 Aus ACW%sT 1943 Jul
+ 8:45 AW ACW%sT
# Queensland
#
@@ -61,42 +61,42 @@ Zone Australia/Eucla 8:35:28 - LMT 1895 Dec
# so use Lindeman.
#
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule AQ 1971 only - Oct lastSun 2:00s 1:00 -
-Rule AQ 1972 only - Feb lastSun 2:00s 0 -
-Rule AQ 1989 1991 - Oct lastSun 2:00s 1:00 -
-Rule AQ 1990 1992 - Mar Sun>=1 2:00s 0 -
-Rule Holiday 1992 1993 - Oct lastSun 2:00s 1:00 -
-Rule Holiday 1993 1994 - Mar Sun>=1 2:00s 0 -
+Rule AQ 1971 only - Oct lastSun 2:00s 1:00 D
+Rule AQ 1972 only - Feb lastSun 2:00s 0 S
+Rule AQ 1989 1991 - Oct lastSun 2:00s 1:00 D
+Rule AQ 1990 1992 - Mar Sun>=1 2:00s 0 S
+Rule Holiday 1992 1993 - Oct lastSun 2:00s 1:00 D
+Rule Holiday 1993 1994 - Mar Sun>=1 2:00s 0 S
Zone Australia/Brisbane 10:12:08 - LMT 1895
- 10:00 Aus EST 1971
- 10:00 AQ EST
+ 10:00 Aus AE%sT 1971
+ 10:00 AQ AE%sT
Zone Australia/Lindeman 9:55:56 - LMT 1895
- 10:00 Aus EST 1971
- 10:00 AQ EST 1992 Jul
- 10:00 Holiday EST
+ 10:00 Aus AE%sT 1971
+ 10:00 AQ AE%sT 1992 Jul
+ 10:00 Holiday AE%sT
# South Australia
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule AS 1971 1985 - Oct lastSun 2:00s 1:00 -
-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 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 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 -
+Rule AS 1971 1985 - Oct lastSun 2:00s 1:00 D
+Rule AS 1986 only - Oct 19 2:00s 1:00 D
+Rule AS 1987 2007 - Oct lastSun 2:00s 1:00 D
+Rule AS 1972 only - Feb 27 2:00s 0 S
+Rule AS 1973 1985 - Mar Sun>=1 2:00s 0 S
+Rule AS 1986 1990 - Mar Sun>=15 2:00s 0 S
+Rule AS 1991 only - Mar 3 2:00s 0 S
+Rule AS 1992 only - Mar 22 2:00s 0 S
+Rule AS 1993 only - Mar 7 2:00s 0 S
+Rule AS 1994 only - Mar 20 2:00s 0 S
+Rule AS 1995 2005 - Mar lastSun 2:00s 0 S
+Rule AS 2006 only - Apr 2 2:00s 0 S
+Rule AS 2007 only - Mar lastSun 2:00s 0 S
+Rule AS 2008 max - Apr Sun>=1 2:00s 0 S
+Rule AS 2008 max - Oct Sun>=1 2:00s 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Australia/Adelaide 9:14:20 - LMT 1895 Feb
- 9:00 - CST 1899 May
- 9:30 Aus CST 1971
- 9:30 AS CST
+ 9:00 - ACST 1899 May
+ 9:30 Aus AC%sT 1971
+ 9:30 AS AC%sT
# Tasmania
#
@@ -105,106 +105,106 @@ Zone Australia/Adelaide 9:14:20 - LMT 1895 Feb
# says King Island didn't observe DST from WWII until late 1971.
#
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule AT 1967 only - Oct Sun>=1 2:00s 1:00 -
-Rule AT 1968 only - Mar lastSun 2:00s 0 -
-Rule AT 1968 1985 - Oct lastSun 2:00s 1:00 -
-Rule AT 1969 1971 - Mar Sun>=8 2:00s 0 -
-Rule AT 1972 only - Feb lastSun 2:00s 0 -
-Rule AT 1973 1981 - Mar Sun>=1 2:00s 0 -
-Rule AT 1982 1983 - Mar lastSun 2:00s 0 -
-Rule AT 1984 1986 - Mar Sun>=1 2:00s 0 -
-Rule AT 1986 only - Oct Sun>=15 2:00s 1:00 -
-Rule AT 1987 1990 - Mar Sun>=15 2:00s 0 -
-Rule AT 1987 only - Oct Sun>=22 2:00s 1:00 -
-Rule AT 1988 1990 - Oct lastSun 2:00s 1:00 -
-Rule AT 1991 1999 - Oct Sun>=1 2:00s 1:00 -
-Rule AT 1991 2005 - Mar lastSun 2:00s 0 -
-Rule AT 2000 only - Aug lastSun 2:00s 1:00 -
-Rule AT 2001 max - Oct Sun>=1 2:00s 1:00 -
-Rule AT 2006 only - Apr Sun>=1 2:00s 0 -
-Rule AT 2007 only - Mar lastSun 2:00s 0 -
-Rule AT 2008 max - Apr Sun>=1 2:00s 0 -
+Rule AT 1967 only - Oct Sun>=1 2:00s 1:00 D
+Rule AT 1968 only - Mar lastSun 2:00s 0 S
+Rule AT 1968 1985 - Oct lastSun 2:00s 1:00 D
+Rule AT 1969 1971 - Mar Sun>=8 2:00s 0 S
+Rule AT 1972 only - Feb lastSun 2:00s 0 S
+Rule AT 1973 1981 - Mar Sun>=1 2:00s 0 S
+Rule AT 1982 1983 - Mar lastSun 2:00s 0 S
+Rule AT 1984 1986 - Mar Sun>=1 2:00s 0 S
+Rule AT 1986 only - Oct Sun>=15 2:00s 1:00 D
+Rule AT 1987 1990 - Mar Sun>=15 2:00s 0 S
+Rule AT 1987 only - Oct Sun>=22 2:00s 1:00 D
+Rule AT 1988 1990 - Oct lastSun 2:00s 1:00 D
+Rule AT 1991 1999 - Oct Sun>=1 2:00s 1:00 D
+Rule AT 1991 2005 - Mar lastSun 2:00s 0 S
+Rule AT 2000 only - Aug lastSun 2:00s 1:00 D
+Rule AT 2001 max - Oct Sun>=1 2:00s 1:00 D
+Rule AT 2006 only - Apr Sun>=1 2:00s 0 S
+Rule AT 2007 only - Mar lastSun 2:00s 0 S
+Rule AT 2008 max - Apr Sun>=1 2:00s 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Australia/Hobart 9:49:16 - LMT 1895 Sep
- 10:00 - EST 1916 Oct 1 2:00
- 10:00 1:00 EST 1917 Feb
- 10:00 Aus EST 1967
- 10:00 AT EST
+ 10:00 - AEST 1916 Oct 1 2:00
+ 10:00 1:00 AEDT 1917 Feb
+ 10:00 Aus AE%sT 1967
+ 10:00 AT AE%sT
Zone Australia/Currie 9:35:28 - LMT 1895 Sep
- 10:00 - EST 1916 Oct 1 2:00
- 10:00 1:00 EST 1917 Feb
- 10:00 Aus EST 1971 Jul
- 10:00 AT EST
+ 10:00 - AEST 1916 Oct 1 2:00
+ 10:00 1:00 AEDT 1917 Feb
+ 10:00 Aus AE%sT 1971 Jul
+ 10:00 AT AE%sT
# Victoria
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule AV 1971 1985 - Oct lastSun 2:00s 1:00 -
-Rule AV 1972 only - Feb lastSun 2:00s 0 -
-Rule AV 1973 1985 - Mar Sun>=1 2:00s 0 -
-Rule AV 1986 1990 - Mar Sun>=15 2:00s 0 -
-Rule AV 1986 1987 - Oct Sun>=15 2:00s 1:00 -
-Rule AV 1988 1999 - Oct lastSun 2:00s 1:00 -
-Rule AV 1991 1994 - Mar Sun>=1 2:00s 0 -
-Rule AV 1995 2005 - Mar lastSun 2:00s 0 -
-Rule AV 2000 only - Aug lastSun 2:00s 1:00 -
-Rule AV 2001 2007 - Oct lastSun 2:00s 1:00 -
-Rule AV 2006 only - Apr Sun>=1 2:00s 0 -
-Rule AV 2007 only - Mar lastSun 2:00s 0 -
-Rule AV 2008 max - Apr Sun>=1 2:00s 0 -
-Rule AV 2008 max - Oct Sun>=1 2:00s 1:00 -
+Rule AV 1971 1985 - Oct lastSun 2:00s 1:00 D
+Rule AV 1972 only - Feb lastSun 2:00s 0 S
+Rule AV 1973 1985 - Mar Sun>=1 2:00s 0 S
+Rule AV 1986 1990 - Mar Sun>=15 2:00s 0 S
+Rule AV 1986 1987 - Oct Sun>=15 2:00s 1:00 D
+Rule AV 1988 1999 - Oct lastSun 2:00s 1:00 D
+Rule AV 1991 1994 - Mar Sun>=1 2:00s 0 S
+Rule AV 1995 2005 - Mar lastSun 2:00s 0 S
+Rule AV 2000 only - Aug lastSun 2:00s 1:00 D
+Rule AV 2001 2007 - Oct lastSun 2:00s 1:00 D
+Rule AV 2006 only - Apr Sun>=1 2:00s 0 S
+Rule AV 2007 only - Mar lastSun 2:00s 0 S
+Rule AV 2008 max - Apr Sun>=1 2:00s 0 S
+Rule AV 2008 max - Oct Sun>=1 2:00s 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Australia/Melbourne 9:39:52 - LMT 1895 Feb
- 10:00 Aus EST 1971
- 10:00 AV EST
+ 10:00 Aus AE%sT 1971
+ 10:00 AV AE%sT
# New South Wales
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule AN 1971 1985 - Oct lastSun 2:00s 1:00 -
-Rule AN 1972 only - Feb 27 2:00s 0 -
-Rule AN 1973 1981 - Mar Sun>=1 2:00s 0 -
-Rule AN 1982 only - Apr Sun>=1 2:00s 0 -
-Rule AN 1983 1985 - Mar Sun>=1 2:00s 0 -
-Rule AN 1986 1989 - Mar Sun>=15 2:00s 0 -
-Rule AN 1986 only - Oct 19 2:00s 1:00 -
-Rule AN 1987 1999 - Oct lastSun 2:00s 1:00 -
-Rule AN 1990 1995 - Mar Sun>=1 2:00s 0 -
-Rule AN 1996 2005 - Mar lastSun 2:00s 0 -
-Rule AN 2000 only - Aug lastSun 2:00s 1:00 -
-Rule AN 2001 2007 - Oct lastSun 2:00s 1:00 -
-Rule AN 2006 only - Apr Sun>=1 2:00s 0 -
-Rule AN 2007 only - Mar lastSun 2:00s 0 -
-Rule AN 2008 max - Apr Sun>=1 2:00s 0 -
-Rule AN 2008 max - Oct Sun>=1 2:00s 1:00 -
+Rule AN 1971 1985 - Oct lastSun 2:00s 1:00 D
+Rule AN 1972 only - Feb 27 2:00s 0 S
+Rule AN 1973 1981 - Mar Sun>=1 2:00s 0 S
+Rule AN 1982 only - Apr Sun>=1 2:00s 0 S
+Rule AN 1983 1985 - Mar Sun>=1 2:00s 0 S
+Rule AN 1986 1989 - Mar Sun>=15 2:00s 0 S
+Rule AN 1986 only - Oct 19 2:00s 1:00 D
+Rule AN 1987 1999 - Oct lastSun 2:00s 1:00 D
+Rule AN 1990 1995 - Mar Sun>=1 2:00s 0 S
+Rule AN 1996 2005 - Mar lastSun 2:00s 0 S
+Rule AN 2000 only - Aug lastSun 2:00s 1:00 D
+Rule AN 2001 2007 - Oct lastSun 2:00s 1:00 D
+Rule AN 2006 only - Apr Sun>=1 2:00s 0 S
+Rule AN 2007 only - Mar lastSun 2:00s 0 S
+Rule AN 2008 max - Apr Sun>=1 2:00s 0 S
+Rule AN 2008 max - Oct Sun>=1 2:00s 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Australia/Sydney 10:04:52 - LMT 1895 Feb
- 10:00 Aus EST 1971
- 10:00 AN EST
+ 10:00 Aus AE%sT 1971
+ 10:00 AN AE%sT
Zone Australia/Broken_Hill 9:25:48 - LMT 1895 Feb
- 10:00 - EST 1896 Aug 23
- 9:00 - CST 1899 May
- 9:30 Aus CST 1971
- 9:30 AN CST 2000
- 9:30 AS CST
+ 10:00 - AEST 1896 Aug 23
+ 9:00 - ACST 1899 May
+ 9:30 Aus AC%sT 1971
+ 9:30 AN AC%sT 2000
+ 9:30 AS AC%sT
# Lord Howe Island
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule LH 1981 1984 - Oct lastSun 2:00 1:00 -
-Rule LH 1982 1985 - Mar Sun>=1 2:00 0 -
-Rule LH 1985 only - Oct lastSun 2:00 0:30 -
-Rule LH 1986 1989 - Mar Sun>=15 2:00 0 -
-Rule LH 1986 only - Oct 19 2:00 0:30 -
-Rule LH 1987 1999 - Oct lastSun 2:00 0:30 -
-Rule LH 1990 1995 - Mar Sun>=1 2:00 0 -
-Rule LH 1996 2005 - Mar lastSun 2:00 0 -
-Rule LH 2000 only - Aug lastSun 2:00 0:30 -
-Rule LH 2001 2007 - Oct lastSun 2:00 0:30 -
-Rule LH 2006 only - Apr Sun>=1 2:00 0 -
-Rule LH 2007 only - Mar lastSun 2:00 0 -
-Rule LH 2008 max - Apr Sun>=1 2:00 0 -
-Rule LH 2008 max - Oct Sun>=1 2:00 0:30 -
+Rule LH 1981 1984 - Oct lastSun 2:00 1:00 D
+Rule LH 1982 1985 - Mar Sun>=1 2:00 0 S
+Rule LH 1985 only - Oct lastSun 2:00 0:30 D
+Rule LH 1986 1989 - Mar Sun>=15 2:00 0 S
+Rule LH 1986 only - Oct 19 2:00 0:30 D
+Rule LH 1987 1999 - Oct lastSun 2:00 0:30 D
+Rule LH 1990 1995 - Mar Sun>=1 2:00 0 S
+Rule LH 1996 2005 - Mar lastSun 2:00 0 S
+Rule LH 2000 only - Aug lastSun 2:00 0:30 D
+Rule LH 2001 2007 - Oct lastSun 2:00 0:30 D
+Rule LH 2006 only - Apr Sun>=1 2:00 0 S
+Rule LH 2007 only - Mar lastSun 2:00 0 S
+Rule LH 2008 max - Apr Sun>=1 2:00 0 S
+Rule LH 2008 max - Oct Sun>=1 2:00 0:30 D
Zone Australia/Lord_Howe 10:36:20 - LMT 1895 Feb
- 10:00 - EST 1981 Mar
- 10:30 LH LHST
+ 10:00 - AEST 1981 Mar
+ 10:30 LH LH%sT
# Australian miscellany
#
@@ -236,12 +236,12 @@ Zone Australia/Lord_Howe 10:36:20 - LMT 1895 Feb
# this is required for correct handling of times before 1916 by
# pre-2013 versions of localtime.
Zone Antarctica/Macquarie 0 - zzz 1899 Nov
- 10:00 - EST 1916 Oct 1 2:00
- 10:00 1:00 EST 1917 Feb
- 10:00 Aus EST 1919 Apr 1 0:00s
+ 10:00 - AEST 1916 Oct 1 2:00
+ 10:00 1:00 AEDT 1917 Feb
+ 10:00 Aus AE%sT 1919 Apr 1 0:00s
0 - zzz 1948 Mar 25
- 10:00 Aus EST 1967
- 10:00 AT EST 2010 Apr 4 3:00
+ 10:00 Aus AE%sT 1967
+ 10:00 AT AE%sT 2010 Apr 4 3:00
11:00 - MIST # Macquarie I Standard Time
# Christmas
@@ -802,21 +802,21 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
# I invented the abbreviations marked '*' in the following table;
# the rest are from earlier versions of this file, or from other sources.
# Corrections are welcome!
-# std dst
-# LMT Local Mean Time
-# 8:00 WST WST Western Australia
-# 8:45 CWST CWST Central Western Australia*
-# 9:00 JST Japan
-# 9:30 CST CST Central Australia
-# 10:00 EST EST Eastern Australia
-# 10:00 ChST Chamorro
-# 10:30 LHST LHST Lord Howe*
-# 11:30 NZMT NZST New Zealand through 1945
-# 12:00 NZST NZDT New Zealand 1946-present
-# 12:45 CHAST CHADT Chatham*
-# -11:00 SST Samoa
-# -10:00 HST Hawaii
-# - 8:00 PST Pitcairn*
+# std dst
+# LMT Local Mean Time
+# 8:00 AWST AWDT Western Australia
+# 8:45 ACWST ACWDT Central Western Australia*
+# 9:00 JST Japan
+# 9:30 ACST ACDT Central Australia
+# 10:00 AEST AEDT Eastern Australia
+# 10:00 ChST Chamorro
+# 10:30 LHST LHDT Lord Howe*
+# 11:30 NZMT NZST New Zealand through 1945
+# 12:00 NZST NZDT New Zealand 1946-present
+# 12:45 CHAST CHADT Chatham*
+# -11:00 SST Samoa
+# -10:00 HST Hawaii
+# - 8:00 PST Pitcairn*
#
# See the 'northamerica' file for Hawaii.
# See the 'southamerica' file for Easter I and the Galápagos Is.
@@ -825,6 +825,19 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
# Australia
+# From Paul Eggert (2014-06-30):
+# Daylight saving time has long been controversial in Australia, pitting
+# region against region, rural against urban, and local against global.
+# For example, in her review of Graeme Davison's _The Unforgiving
+# Minute: how Australians learned to tell the time_ (1993), Perth native
+# Phillipa J Martyr wrote, "The section entitled 'Saving Daylight' was
+# very informative, but was (as can, sadly, only be expected from a
+# Melbourne-based study) replete with the usual chuckleheaded
+# Queenslanders and straw-chewing yokels from the West prattling fables
+# about fading curtains and crazed farm animals."
+# Electronic Journal of Australian and New Zealand History (1997-03-03)
+# http://www.jcu.edu.au/aff/history/reviews/davison.htm
+
# From Paul Eggert (2005-12-08):
# Implementation Dates of Daylight Saving Time within Australia
# <http://www.bom.gov.au/climate/averages/tables/dst_times.shtml>
@@ -853,98 +866,105 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
# prefixed by the word 'Australian' when referring to local times;
# time announcements on that service, naturally enough, are made in UTC.
-# From Arthur David Olson (1992-03-08):
-# Given the above, what's chosen for year-round use is:
-# CST for any place operating at a GMTOFF of 9:30
-# WST for any place operating at a GMTOFF of 8:00
-# EST for any place operating at a GMTOFF of 10:00
-
-# From Chuck Soper (2006-06-01):
-# I recently found this Australian government web page on time zones:
-# <http://www.australia.gov.au/about-australia-13time>
-# And this government web page lists time zone names and abbreviations:
-# <http://www.bom.gov.au/climate/averages/tables/daysavtm.shtml>
-
-# From Paul Eggert (2001-04-05), summarizing a long discussion about "EST"
-# versus "AEST" etc.:
-#
-# I see the following points of dispute:
-#
-# * How important are unique time zone abbreviations?
-#
-# Here I tend to agree with the point (most recently made by Chris
-# Newman) that unique abbreviations should not be essential for proper
-# operation of software. We have other instances of ambiguity
-# (e.g. "IST" denoting both "Israel Standard Time" and "Indian
-# Standard Time"), and they are not likely to go away any time soon.
-# In the old days, some software mistakenly relied on unique
-# abbreviations, but this is becoming less true with time, and I don't
-# think it's that important to cater to such software these days.
-#
-# On the other hand, there is another motivation for unambiguous
-# abbreviations: it cuts down on human confusion. This is
-# particularly true for Australia, where "EST" can mean one thing for
-# time T and a different thing for time T plus 1 second.
-#
-# * Does the relevant legislation indicate which abbreviations should be used?
-#
-# Here I tend to think that things are a mess, just as they are in
-# many other countries. We Americans are currently disagreeing about
-# which abbreviation to use for the newly legislated Chamorro Standard
-# Time, for example.
-#
-# Personally, I would prefer to use common practice; I would like to
-# refer to legislation only for examples of common practice, or as a
-# tiebreaker.
-#
-# * Do Australians more often use "Eastern Daylight Time" or "Eastern
-# Summer Time"? Do they typically prefix the time zone names with
-# the word "Australian"?
-#
-# My own impression is that both "Daylight Time" and "Summer Time" are
-# common and are widely understood, but that "Summer Time" is more
-# popular; and that the leading "A" is also common but is omitted more
-# often than not. I just used AltaVista advanced search and got the
-# following count of page hits:
-#
-# 1,103 "Eastern Summer Time" AND domain:au
-# 971 "Australian Eastern Summer Time" AND domain:au
-# 613 "Eastern Daylight Time" AND domain:au
-# 127 "Australian Eastern Daylight Time" AND domain:au
-#
-# Here "Summer" seems quite a bit more popular than "Daylight",
-# particularly when we know the time zone is Australian and not US,
-# say. The "Australian" prefix seems to be popular for Eastern Summer
-# Time, but unpopular for Eastern Daylight Time.
-#
-# For abbreviations, tools like AltaVista are less useful because of
-# ambiguity. Many hits are not really time zones, unfortunately, and
-# many hits denote US time zones and not Australian ones. But here
-# are the hit counts anyway:
-#
-# 161,304 "EST" and domain:au
-# 25,156 "EDT" and domain:au
-# 18,263 "AEST" and domain:au
-# 10,416 "AEDT" and domain:au
-#
-# 14,538 "CST" and domain:au
-# 5,728 "CDT" and domain:au
-# 176 "ACST" and domain:au
-# 29 "ACDT" and domain:au
-#
-# 7,539 "WST" and domain:au
-# 68 "AWST" and domain:au
-#
-# This data suggest that Australians tend to omit the "A" prefix in
-# practice. The situation for "ST" versus "DT" is less clear, given
-# the ambiguities involved.
-#
-# * How do Australians feel about the abbreviations in the tz database?
-#
-# If you just count Australians on this list, I count 2 in favor and 3
-# against. One of the "against" votes (David Keegel) counseled delay,
-# saying that both AEST/AEDT and EST/EST are widely used and
-# understood in Australia.
+# From Paul Eggert (2014-06-30):
+#
+# Inspired by Mackin's remarks quoted above, earlier versions of this
+# file used "EST" for both Eastern Standard Time and Eastern Summer
+# Time in Australia, and similarly for "CST", "CWST", and "WST".
+# However, these abbreviations were confusing and were not common
+# practice among Australians, and there were justifiable complaints
+# about them, so I attempted to survey current Australian usage.
+# For the tz database, the full English phrase is not that important;
+# what matters is the abbreviation. It's difficult to survey the web
+# directly for abbreviation usage, as there are so many false hits for
+# strings like "EST" and "EDT", so I looked for pages that defined an
+# abbreviation for eastern or central DST in Australia, and got the
+# following numbers of unique hits for the listed Google queries:
+#
+# 10 "Eastern Daylight Time AEST" site:au [some are false hits]
+# 10 "Eastern Summer Time AEST" site:au
+# 10 "Summer Time AEDT" site:au
+# 13 "EDST Eastern Daylight Saving Time" site:au
+# 18 "Summer Time ESST" site:au
+# 28 "Eastern Daylight Saving Time EDST" site:au
+# 39 "EDT Eastern Daylight Time" site:au [some are false hits]
+# 53 "Eastern Daylight Time EDT" site:au [some are false hits]
+# 54 "AEDT Australian Eastern Daylight Time" site:au
+# 182 "Eastern Daylight Time AEDT" site:au
+#
+# 17 "Central Daylight Time CDT" site:au [some are false hits]
+# 46 "Central Daylight Time ACDT" site:au
+#
+# I tried several other variants (e.g., "Eastern Summer Time EST") but
+# they all returned fewer than 10 unique hits. I also looked for pages
+# mentioning both "western standard time" and an abbreviation, since
+# there is no WST in the US to generate false hits, and found:
+#
+# 156 "western standard time" AWST site:au
+# 226 "western standard time" WST site:au
+#
+# I then surveyed the top ten newspapers in Australia by circulation as
+# listed in Wikipedia, using Google queries like "AEDT site:heraldsun.com.au"
+# and obtaining estimated counts from the initial page of search results.
+# All ten papers greatly preferred "AEDT" to "EDT". The papers
+# surveyed were the Herald Sun, The Daily Telegraph, The Courier-Mail,
+# The Sydney Morning Herald, The West Australian, The Age, The Advertiser,
+# The Australian, The Financial Review, and The Herald (Newcastle).
+#
+# I also searched for historical usage, to see whether abbreviations
+# like "AEDT" are new. A Trove search <http://trove.nla.gov.au/>
+# found only one newspaper (The Canberra Times) with a house style
+# dating back to the 1970s, I expect because other newspapers weren't
+# fully indexed. The Canberra Times strongly preferred abbreviations
+# like "AEDT". The first occurrence of "AEDT" was a World Weather
+# column (1971-11-17, page 24), and of "ACDT" was a Scoreboard column
+# (1993-01-24, p 16). The style was the typical usage but was not
+# strictly enforced; for example, "Welcome to the twilight zones ..."
+# (1994-10-29, p 1) uses the abbreviations AEST/AEDT, CST/CDT, and
+# WST, and goes on to say, "The confusion and frustration some feel
+# about the lack of uniformity among Australia's six states and two
+# territories has prompted one group to form its very own political
+# party -- the Sydney-based Daylight Saving Extension Party."
+#
+# I also surveyed federal government sources. They did not agree:
+#
+# The Australian Government (2014-03-26)
+# http://australia.gov.au/about-australia/our-country/time
+# (This document was produced by the Department of Finance.)
+# AEST ACST AWST AEDT ACDT
+#
+# Bureau of Meteorology (2012-11-08)
+# http://www.bom.gov.au/climate/averages/tables/daysavtm.shtml
+# EST CST WST EDT CDT
+#
+# Civil Aviation Safety Authority (undated)
+# http://services.casa.gov.au/outnback/inc/pages/episode3/episode-3_time_zones.shtml
+# EST CST WST (no abbreviations given for DST)
+#
+# Geoscience Australia (2011-11-24)
+# http://www.ga.gov.au/geodesy/astro/sunrise.jsp
+# AEST ACST AWST AEDT ACDT
+#
+# Parliamentary Library (2008-11-10)
+# http://www.aph.gov.au/binaries/library/pubs/rp/2008-09/09rp14.pdf
+# EST CST WST preferred for standard time; AEST AEDT ACST ACDT also used
+#
+# The Transport Safety Bureau has an extensive series of accident reports,
+# and investigators seem to use whatever abbreviation they like.
+# Googling site:atsb.gov.au found the following number of unique hits:
+# 311 "ESuT", 195 "EDT", 26 "AEDT", 83 "CSuT", 46 "CDT".
+# "_SuT" tended to appear in older reports, and "A_DT" tended to
+# appear in reports of events with international implications.
+#
+# From the above it appears that there is a working consensus in
+# Australia to use trailing "DT" for daylight saving time; although
+# some sources use trailing "SST" or "ST" or "SuT" they are by far in
+# the minority. The case for leading "A" is weaker, but since it
+# seems to be preferred in the overall web and is preferred in all
+# the leading newspaper websites and in many government departments,
+# it has a stronger case than omitting the leading "A". The current
+# version of the database therefore uses abbreviations like "AEST" and
+# "AEDT" for Australian time zones.
# From Paul Eggert (1995-12-19):
# Shanks & Pottenger report 2:00 for all autumn changes in Australia and NZ.
--
1.9.1
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