[tz] Portuguese time zones - Africa/Luanda
Paul Eggert
eggert at cs.ucla.edu
Mon Aug 11 07:32:24 UTC 2014
Stephen Colebourne wrote:
> I'd suggest that the data should be changed from 1911 May 26 to 1
> January 1912
Thanks, I pushed the attached change to the experimental version on github.
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From 115b6002d8601dd4f110082ab52c7b0e726ce9b2 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Mon, 11 Aug 2014 00:28:13 -0700
Subject: [PATCH] Adjust pre-1912 Portuguese transitions in the light of the
1911 decree.
(Thanks to Stephen Colebourne for a heads-up about the decree.)
* africa (Africa/Luanda, Africa/Bissau):
Change transition date to 1912-01-01.
(Atlantic/Cape_Verde, Africa/Maputo):
Add commentary about the switch.
* asia (Asia/Kolkata): Add commentary about Portuguese India.
* europe (Europe/Lisbon): Change Lisbon Mean Time from -0:36:32
to -0:36:45 (rounded from -0:36:44.68).
(Atlantic/Azores, Atlantic/Madeira):
Change transition date to 1912-01-01.
* NEWS: Document the above.
---
NEWS | 6 ++++++
africa | 30 +++++++++++++++++++++++++++---
asia | 11 +++++++++--
europe | 19 +++++++++++++------
4 files changed, 55 insertions(+), 11 deletions(-)
diff --git a/NEWS b/NEWS
index 7db0a32..cdaf3dd 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,12 @@ Unreleased, experimental changes
Asia/Yekaterinburg the correction is a few minutes. (Thanks to
Vladimir Karpinsky.)
+ The Portuguese decree of 1911-05-25 took effect on 1912-01-01.
+ This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
+ Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
+ GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
+ (Thanks to Stephen Colebourne for pointing to the decree.)
+
Asia/Dakha ended DST on 2009-12-31 at 24:00, not 23:59.
diff --git a/africa b/africa
index 438f2a7..c20a46d 100644
--- a/africa
+++ b/africa
@@ -105,16 +105,22 @@ Zone Africa/Algiers 0:12:12 - LMT 1891 Mar 15 0:01
1:00 - CET
# Angola
+#
+# Shanks gives 1911-05-26 for the transition to WAT,
+# evidently confusing the date of the Portuguese decree
+# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
+# with the date that it took effect, namely 1912-01-01.
+#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Luanda 0:52:56 - LMT 1892
- 0:52:04 - AOT 1911 May 26 # Angola Time
+ 0:52:04 - AOT 1912 Jan 1 # Angola Time
1:00 - WAT
# Benin
# Whitman says they switched to 1:00 in 1946, not 1934;
# go with Shanks & Pottenger.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
-Zone Africa/Porto-Novo 0:10:28 - LMT 1912
+Zone Africa/Porto-Novo 0:10:28 - LMT 1912 Jan 1
0:00 - GMT 1934 Feb 26
1:00 - WAT
@@ -144,6 +150,12 @@ Zone Africa/Douala 0:38:48 - LMT 1912
1:00 - WAT
# Cape Verde
+#
+# Shanks gives 1907 for the transition to CVT.
+# Perhaps the 1911-05-26 Portuguese decree
+# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
+# merely made it official?
+#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Atlantic/Cape_Verde -1:34:04 - LMT 1907 # Praia
-2:00 - CVT 1942 Sep
@@ -461,8 +473,14 @@ Zone Africa/Accra -0:00:52 - LMT 1918
# See Africa/Abidjan.
# Guinea-Bissau
+#
+# Shanks gives 1911-05-26 for the transition to WAT,
+# evidently confusing the date of the Portuguese decree
+# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
+# with the date that it took effect, namely 1912-01-01.
+#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
-Zone Africa/Bissau -1:02:20 - LMT 1911 May 26
+Zone Africa/Bissau -1:02:20 - LMT 1912 Jan 1
-1:00 - WAT 1975
0:00 - GMT
@@ -964,6 +982,12 @@ Zone Africa/El_Aaiun -0:52:48 - LMT 1934 Jan # El Aaiún
0:00 Morocco WE%sT
# Mozambique
+#
+# Shanks gives 1903-03-01 for the transition to CAT.
+# Perhaps the 1911-05-26 Portuguese decree
+# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
+# merely made it official?
+#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Maputo 2:10:20 - LMT 1903 Mar
2:00 - CAT
diff --git a/asia b/asia
index bab1aa0..17813ce 100644
--- a/asia
+++ b/asia
@@ -765,7 +765,7 @@ Rule Macau 1975 1977 - Apr Sun>=15 3:30 1:00 S
Rule Macau 1978 1980 - Apr Sun>=15 0:00 1:00 S
Rule Macau 1978 1980 - Oct Sun>=15 0:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
-Zone Asia/Macau 7:34:20 - LMT 1912
+Zone Asia/Macau 7:34:20 - LMT 1912 Jan 1
8:00 Macau MO%sT 1999 Dec 20 # return to China
8:00 PRC C%sT
@@ -870,7 +870,7 @@ Zone Asia/Tbilisi 2:59:11 - LMT 1880
# midnight on Saturday, September 16.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
-Zone Asia/Dili 8:22:20 - LMT 1912
+Zone Asia/Dili 8:22:20 - LMT 1912 Jan 1
8:00 - TLT 1942 Feb 21 23:00 # E Timor Time
9:00 - JST 1945 Sep 23
9:00 - TLT 1976 May 3
@@ -878,6 +878,13 @@ Zone Asia/Dili 8:22:20 - LMT 1912
9:00 - TLT
# India
+
+# From Paul Eggert (2014-08-11), after a heads-up from Stephen Colebourne:
+# According to a Portuguese decree (1911-05-26)
+# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
+# Portuguese India switched to GMT+5 on 1912-01-01.
+# Ignore this as it predates our 1970 cutoff.
+
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Kolkata 5:53:28 - LMT 1880 # Kolkata
5:53:20 - HMT 1941 Oct # Howrah Mean Time?
diff --git a/europe b/europe
index 010fa2e..001fb4d 100644
--- a/europe
+++ b/europe
@@ -1961,6 +1961,14 @@ Zone Europe/Warsaw 1:24:00 - LMT 1880
# Portugal
#
+# From Paul Eggert (2014-08-11), after a heads-up from Stephen Colebourne:
+# According to a Portuguese decree (1911-05-26)
+# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
+# Lisbon was at -0:36:44.68, but switched to GMT on 1912-01-01 at 00:00.
+# Round the old offset to -0:36:45. This agrees with Willett but disagrees
+# with Shanks, who says the transition occurred on 1911-05-24 at 00:00 for
+# Europe/Lisbon, Atlantic/Azores, and Atlantic/Madeira.
+#
# From Rui Pedro Salgueiro (1992-11-12):
# Portugal has recently (September, 27) changed timezone
# (from WET to MET or CET) to harmonize with EEC.
@@ -2040,11 +2048,10 @@ Rule Port 1979 1982 - Sep lastSun 1:00s 0 -
Rule Port 1980 only - Mar lastSun 0:00s 1:00 S
Rule Port 1981 1982 - Mar lastSun 1:00s 1:00 S
Rule Port 1983 only - Mar lastSun 2:00s 1:00 S
+#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
-# Shanks & Pottenger say the transition from LMT to WET occurred 1911-05-24;
-# Willett says 1912-01-01. Go with Willett.
-Zone Europe/Lisbon -0:36:32 - LMT 1884
- -0:36:32 - LMT 1912 Jan 1 # Lisbon Mean Time
+Zone Europe/Lisbon -0:36:45 - LMT 1884
+ -0:36:45 - LMT 1912 Jan 1 # Lisbon Mean Time
0:00 Port WE%sT 1966 Apr 3 2:00
1:00 - CET 1976 Sep 26 1:00
0:00 Port WE%sT 1983 Sep 25 1:00s
@@ -2052,14 +2059,14 @@ Zone Europe/Lisbon -0:36:32 - LMT 1884
1:00 EU CE%sT 1996 Mar 31 1:00u
0:00 EU WE%sT
Zone Atlantic/Azores -1:42:40 - LMT 1884 # Ponta Delgada
- -1:54:32 - HMT 1911 May 24 # Horta Mean Time
+ -1:54:32 - HMT 1912 Jan 1 # Horta Mean Time
-2:00 Port AZO%sT 1966 Apr 3 2:00 # Azores Time
-1:00 Port AZO%sT 1983 Sep 25 1:00s
-1:00 W-Eur AZO%sT 1992 Sep 27 1:00s
0:00 EU WE%sT 1993 Mar 28 1:00u
-1:00 EU AZO%sT
Zone Atlantic/Madeira -1:07:36 - LMT 1884 # Funchal
- -1:07:36 - FMT 1911 May 24 # Funchal Mean Time
+ -1:07:36 - FMT 1912 Jan 1 # Funchal Mean Time
-1:00 Port MAD%sT 1966 Apr 3 2:00 # Madeira Time
0:00 Port WE%sT 1983 Sep 25 1:00s
0:00 EU WE%sT
--
1.9.1
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