[tz] Some time zone history (1)
Paul Eggert
eggert at cs.ucla.edu
Tue Nov 24 23:45:05 UTC 2020
Thanks for those legal citations. My goodness, you've done a lot of good work.
Let's start with the citations for Australia; I plan to look at the other
countries later. Proposed patch attached. The biggest change from my point of
view is that Australia/Currie is now obsolete because it no longer differs from
Australia/Hobart for timestamps after 1970.
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From 1aca4cad3692063cd5cb571883ccf6d04b3c2991 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Tue, 24 Nov 2020 15:40:34 -0800
Subject: [PROPOSED] Fix several pre-1972 transitions for Australia
(Thanks to P Chan.) This entails obsoleting Australia/Currie.
* NEWS: mention this.
* australasia (Aus): Use 2:00s for Australian DST transitions, as
per the legal citations. Prefer lastSun to explicit dates if that
is what the law said.
(AT): Add DST for late 1917 through early 1919. Prefer the
oddball Sun>=29 to match the legal wording better (5th Sunday).
(Australia/Currie): Move from here ...
* backzone (Australia/Currie): ... to here, and correct because
King Island restarted DST in late 1968, not late 1971.
* backward (Australia/Currie): New backward-compatibility link.
* zone.tab, zone1970.tab (Australia/Currie): Remove.
---
NEWS | 15 ++++++++---
australasia | 71 +++++++++++++++++++++++++++++++++++++++-------------
backward | 1 +
backzone | 6 +++++
zone.tab | 3 +--
zone1970.tab | 3 +--
6 files changed, 73 insertions(+), 26 deletions(-)
diff --git a/NEWS b/NEWS
index 756bbe0..f7b0461 100644
--- a/NEWS
+++ b/NEWS
@@ -4,13 +4,20 @@ Unreleased, experimental changes
Changes to past timestamps
- Correct several pre-1970 transitions, fixing entries originally
+ Correct several pre-1972 transitions, fixing entries originally
derived from Shanks. The fixes include:
- - Several 1942 through 1968 transitions for Belize.
- - Several 1940 through 1985 transitions for Israel and Palestine.
- - Several 1908 through 1960 transitions for Kenya and adjacent.
+ - Australia: several 1917 through 1971 transitions.
+ - Belize: several 1942 through 1968 transitions
+ - Israel and Palestine: several 1940 through 1985 transitions
+ - Kenya and adjacent: several 1908 through 1960 transitions
(Thanks to P Chan.)
+ Because of the Australia change, Australia/Currie (King Island) is
+ no longer needed, as it is identical to Australia/Hobart for all
+ timestamps since 1970 and was therefore created by mistake.
+ Australia/Currie has been moved to the 'backward' file and its
+ corrected data moved to the 'backzone' file.
+
Release 2020d - 2020-10-21 11:24:13 -0700
diff --git a/australasia b/australasia
index aa7ab7f..d6c4e7c 100644
--- a/australasia
+++ b/australasia
@@ -14,16 +14,13 @@
# Please see the notes below for the controversy about "EST" versus "AEST" etc.
# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
-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.
+Rule Aus 1917 only - Jan 1 2:00s 1:00 D
+Rule Aus 1917 only - Mar lastSun 2:00s 0 S
+Rule Aus 1942 only - Jan 1 2:00s 1:00 D
+Rule Aus 1942 only - Mar lastSun 2:00s 0 S
+Rule Aus 1942 only - Sep 27 2:00s 1:00 D
+Rule Aus 1943 1944 - Mar lastSun 2:00s 0 S
+Rule Aus 1943 only - Oct 3 2:00s 1:00 D
# Zone NAME STDOFF RULES FORMAT [UNTIL]
# Northern Territory
@@ -115,8 +112,12 @@ 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 - IN ON AT SAVE LETTER/S
+Rule AT 1916 only - Oct Sun>=1 2:00s 1:00 D
+Rule AT 1917 only - Mar lastSun 2:00s 0 S
+Rule AT 1917 1918 - Oct Sun>=22 2:00s 1:00 D
+Rule AT 1918 1919 - Mar Sun>=1 2:00s 0 S
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 only - Mar Sun>=29 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
@@ -136,15 +137,9 @@ Rule AT 2007 only - Mar lastSun 2:00s 0 S
Rule AT 2008 max - Apr Sun>=1 2:00s 0 S
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Australia/Hobart 9:49:16 - LMT 1895 Sep
- 10:00 - AEST 1916 Oct 1 2:00
- 10:00 1:00 AEDT 1917 Feb
+ 10:00 AT AE%sT 1919 Oct 24
10:00 Aus AE%sT 1967
10:00 AT AE%sT
-Zone Australia/Currie 9:35:28 - LMT 1895 Sep
- 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 - IN ON AT SAVE LETTER/S
@@ -958,6 +953,25 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
# Electronic Journal of Australian and New Zealand History (1997-03-03)
# http://www.jcu.edu.au/aff/history/reviews/davison.htm
+# From P Chan (2020-11-20):
+# Daylight Saving Act 1916 (No. 40 of 1916) [1916-12-21, commenced 1917-01-01]
+# http://classic.austlii.edu.au/au/legis/cth/num_act/dsa1916401916192/
+#
+# Daylight Saving Repeal Act 1917 (No. 35 of 1917) [1917-09-25]
+# http://classic.austlii.edu.au/au/legis/cth/num_act/dsra1917351917243/
+#
+# Statutory Rules 1941, No. 323 [1941-12-24]
+# https://www.legislation.gov.au/Details/C1941L00323
+#
+# Statutory Rules 1942, No. 392 [1942-09-10]
+# https://www.legislation.gov.au/Details/C1942L00392
+#
+# Statutory Rules 1943, No. 241 [1943-09-29]
+# https://www.legislation.gov.au/Details/C1943L00241
+#
+# All transition times should be 02:00 standard time.
+
+
# 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
@@ -1350,6 +1364,27 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
# Tasmania
+# From P Chan (2020-11-20):
+# Tasmania observed DST in 1916-1919.
+#
+# Daylight Saving Act, 1916 (7 Geo V, No 2) [1916-09-22]
+# http://classic.austlii.edu.au/au/legis/tas/num_act/tdsa19167gvn2267/
+#
+# Daylight Saving Amendment Act, 1917 (8 Geo V, No 5) [1917-10-01]
+# http://classic.austlii.edu.au/au/legis/tas/num_act/tdsaa19178gvn5347/
+#
+# Daylight Saving Act Repeal Act, 1919 (10 Geo V, No 9) [1919-10-24]
+# http://classic.austlii.edu.au/au/legis/tas/num_act/tdsara191910gvn9339/
+#
+# King Island is mentioned in the 1967 Act but not the 1968 Act.
+# Therefore it possibly observed DST from 1968/69.
+#
+# Daylight Saving Act 1967 (No. 33 of 1967) [1967-09-22]
+# http://classic.austlii.edu.au/au/legis/tas/num_act/dsa196733o1967211/
+#
+# Daylight Saving Act 1968 (No. 42 of 1968) [1968-10-15]
+# http://classic.austlii.edu.au/au/legis/tas/num_act/dsa196842o1968211/
+
# The rules for 1967 through 1991 were reported by George Shepherd
# via Simon Woodhead via Robert Elz (1991-03-06):
# # The state of TASMANIA.. [Courtesy Tasmanian Dept of Premier + Cabinet ]
diff --git a/backward b/backward
index e13ae52..0c55be2 100644
--- a/backward
+++ b/backward
@@ -49,6 +49,7 @@ Link Atlantic/Faroe Atlantic/Faeroe
Link Europe/Oslo Atlantic/Jan_Mayen
Link Australia/Sydney Australia/ACT
Link Australia/Sydney Australia/Canberra
+Link Australia/Hobart Australia/Currie
Link Australia/Lord_Howe Australia/LHI
Link Australia/Sydney Australia/NSW
Link Australia/Darwin Australia/North
diff --git a/backzone b/backzone
index 563aff6..3ce7277 100644
--- a/backzone
+++ b/backzone
@@ -623,6 +623,12 @@ Zone Atlantic/St_Helena -0:22:48 - LMT 1890 # Jamestown
-0:22:48 - JMT 1951 # Jamestown Mean Time
0:00 - GMT
+# King Island
+Zone Australia/Currie 9:35:28 - LMT 1895 Sep
+ 10:00 AT AE%sT 1919 Oct 24
+ 10:00 Aus AE%sT 1968 Oct 15
+ 10:00 AT AE%sT
+
# Northern Ireland
Zone Europe/Belfast -0:23:40 - LMT 1880 Aug 2
-0:25:21 - DMT 1916 May 21 2:00
diff --git a/zone.tab b/zone.tab
index 6333b99..fe48c13 100644
--- a/zone.tab
+++ b/zone.tab
@@ -56,8 +56,7 @@ AS -1416-17042 Pacific/Pago_Pago
AT +4813+01620 Europe/Vienna
AU -3133+15905 Australia/Lord_Howe Lord Howe Island
AU -5430+15857 Antarctica/Macquarie Macquarie Island
-AU -4253+14719 Australia/Hobart Tasmania (most areas)
-AU -3956+14352 Australia/Currie Tasmania (King Island)
+AU -4253+14719 Australia/Hobart Tasmania
AU -3749+14458 Australia/Melbourne Victoria
AU -3352+15113 Australia/Sydney New South Wales (most areas)
AU -3157+14127 Australia/Broken_Hill New South Wales (Yancowinna)
diff --git a/zone1970.tab b/zone1970.tab
index 699dda2..205ed5a 100644
--- a/zone1970.tab
+++ b/zone1970.tab
@@ -63,8 +63,7 @@ AS,UM -1416-17042 Pacific/Pago_Pago Samoa, Midway
AT +4813+01620 Europe/Vienna
AU -3133+15905 Australia/Lord_Howe Lord Howe Island
AU -5430+15857 Antarctica/Macquarie Macquarie Island
-AU -4253+14719 Australia/Hobart Tasmania (most areas)
-AU -3956+14352 Australia/Currie Tasmania (King Island)
+AU -4253+14719 Australia/Hobart Tasmania
AU -3749+14458 Australia/Melbourne Victoria
AU -3352+15113 Australia/Sydney New South Wales (most areas)
AU -3157+14127 Australia/Broken_Hill New South Wales (Yancowinna)
--
2.27.0
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