From 115b6002d8601dd4f110082ab52c7b0e726ce9b2 Mon Sep 17 00:00:00 2001 From: Paul Eggert 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