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Move out-of-scope UTC+1 African zones to 'backzone'.

Browse Source 
This illustrates how 'backzone' can be used to migrate
out-of-scope data out of the database proper.
* africa (Africa/Luanda, Africa/Porto-Novo, Africa/Douala, Africa/Bangui)
(Africa/Kinshasa, Africa/Brazzaville, Africa/Malabo, Africa/Libreville)
(Africa/Niamey): Change these from zones to links (to Africa/Lagos).
Move their old data from here ...
* backzone: ... to here.
* checktab.awk (tztab): Remove special cases for these zones.
* NEWS: Document the above.
This commit is contained in:
Paul Eggert
2014-08-12 14:32:38 -07:00
parent ac5bf48519
commit 94f941ebd1
4 changed files with 81 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
NEWS
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@ -26,6 +26,14 @@ Unreleased, experimental changes
default. (Thanks to Lester Caine for the Guernsey, Jersey, and
Isle of Man entries in 'backzone'.)
Some more zones have been turned into links, when they differed
from existing zones only for older time stamps. As usual,
these changes affect UTC offsets in pre-1970 time stamps only.
Their old data have been moved to the 'backzone' file.
The affected zones are: Africa/Bangui, Africa/Brazzaville,
Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
Changes affecting code
tzselect -c now uses a hybrid distance measure that works better

60
africa
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@ -106,24 +106,8 @@ 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 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 Jan 1
0:00 - GMT 1934 Feb 26
1:00 - WAT
# See Africa/Lagos.
# Botswana
# From Paul Eggert (2013-02-21):
@ -145,10 +129,7 @@ Zone Africa/Bujumbura 1:57:28 - LMT 1890
2:00 - CAT
# Cameroon
# Whitman says they switched to 1:00 in 1920; go with Shanks & Pottenger.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Douala 0:38:48 - LMT 1912
1:00 - WAT
# See Africa/Lagos.
# Cape Verde
#
@ -165,9 +146,7 @@ Zone Atlantic/Cape_Verde -1:34:04 - LMT 1907 # Praia
-1:00 - CVT
# Central African Republic
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Bangui 1:14:20 - LMT 1912
1:00 - WAT
# See Africa/Lagos.
# Chad
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@ -181,17 +160,14 @@ Zone Africa/Ndjamena 1:00:12 - LMT 1912 # N'Djamena
Zone Indian/Comoro 2:53:04 - LMT 1911 Jul # Moroni, Gran Comoro
3:00 - EAT
# Democratic Republic of Congo
# Democratic Republic of the Congo
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Kinshasa 1:01:12 - LMT 1897 Nov 9
1:00 - WAT
Zone Africa/Lubumbashi 1:49:52 - LMT 1897 Nov 9
2:00 - CAT
# The above is for the eastern part; see Africa/Lagos for the western part.
# Republic of the Congo
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Brazzaville 1:01:08 - LMT 1912
1:00 - WAT
# See Africa/Lagos.
# Côte d'Ivoire / Ivory Coast
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@ -421,10 +397,7 @@ Zone Africa/Cairo 2:05:09 - LMT 1900 Oct
2:00 Egypt EE%sT
# Equatorial Guinea
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Malabo 0:35:08 - LMT 1912
0:00 - GMT 1963 Dec 15
1:00 - WAT
# See Africa/Lagos.
# Eritrea
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@ -449,9 +422,7 @@ Zone Africa/Addis_Ababa 2:34:48 - LMT 1870
3:00 - EAT
# Gabon
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Libreville 0:37:48 - LMT 1912
1:00 - WAT
# See Africa/Lagos.
# Gambia
# See Africa/Abidjan.
@ -1023,16 +994,21 @@ Zone Africa/Windhoek 1:08:24 - LMT 1892 Feb 8
1:00 Namibia WA%sT
# Niger
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Niamey 0:08:28 - LMT 1912
-1:00 - WAT 1934 Feb 26
0:00 - GMT 1960
1:00 - WAT
# See Africa/Lagos.
# Nigeria
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Lagos 0:13:36 - LMT 1919 Sep
1:00 - WAT
Link Africa/Lagos Africa/Bangui # Central African Republic
Link Africa/Lagos Africa/Brazzaville # Rep. of the Congo
Link Africa/Lagos Africa/Douala # Cameroon
Link Africa/Lagos Africa/Kinshasa # Dem. Rep. of the Congo (west)
Link Africa/Lagos Africa/Libreville # Gabon
Link Africa/Lagos Africa/Luanda # Angola
Link Africa/Lagos Africa/Malabo # Equatorial Guinea
Link Africa/Lagos Africa/Niamey # Niger
Link Africa/Lagos Africa/Porto-Novo # Benin
# Réunion
# Zone NAME GMTOFF RULES FORMAT [UNTIL]

55
backzone
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@ -44,12 +44,20 @@ Zone Africa/Bamako -0:32:00 - LMT 1912
-1:00 - WAT 1960 Jun 20
0:00 - GMT
# Central African Republic
Zone Africa/Bangui 1:14:20 - LMT 1912
1:00 - WAT
# Gambia
Zone Africa/Banjul -1:06:36 - LMT 1912
-1:06:36 - BMT 1935 # Banjul Mean Time
-1:00 - WAT 1964
0:00 - GMT
# Republic of the Congo
Zone Africa/Brazzaville 1:01:08 - LMT 1912
1:00 - WAT
# Guinea
Zone Africa/Conakry -0:54:52 - LMT 1912
0:00 - GMT 1934 Feb 26
@ -61,6 +69,10 @@ Zone Africa/Dakar -1:09:44 - LMT 1912
-1:00 - WAT 1941 Jun
0:00 - GMT
# Cameroon
# Whitman says they switched to 1:00 in 1920; go with Shanks & Pottenger.
Zone Africa/Douala 0:38:48 - LMT 1912
1:00 - WAT
# Sierra Leone
# From Paul Eggert (2014-08-12):
# The following table is from Shanks & Pottenger, but it can't be right.
@ -82,10 +94,46 @@ Zone Africa/Juba 2:06:24 - LMT 1931
2:00 Sudan CA%sT 2000 Jan 15 12:00
3:00 - EAT
# Democratic Republic of the Congo (west)
Zone Africa/Kinshasa 1:01:12 - LMT 1897 Nov 9
1:00 - WAT
# Gabon
Zone Africa/Libreville 0:37:48 - LMT 1912
1:00 - WAT
# 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 Africa/Luanda 0:52:56 - LMT 1892
0:52:04 - AOT 1912 Jan 1 # Angola Time
1:00 - WAT
# Togo
Zone Africa/Lome 0:04:52 - LMT 1893
0:00 - GMT
# Equatorial Guinea
#
# Although Shanks says that Malabo switched from UTC to UTC+1 on 1963-12-15,
# a Google Books search says that London Calling, Issues 432-465 (1948), p 19,
# says that Spanish Guinea was at GMT+1 back then. The Shanks data are most
# likely wrong, but we have nothing better; use them here for now.
#
Zone Africa/Malabo 0:35:08 - LMT 1912
0:00 - GMT 1963 Dec 15
1:00 - WAT
# Niger
Zone Africa/Niamey 0:08:28 - LMT 1912
-1:00 - WAT 1934 Feb 26
0:00 - GMT 1960
1:00 - WAT
# Mauritania
Zone Africa/Nouakchott -1:03:48 - LMT 1912
0:00 - GMT 1934 Feb 26
@ -96,6 +144,13 @@ Zone Africa/Nouakchott -1:03:48 - LMT 1912
Zone Africa/Ouagadougou -0:06:04 - LMT 1912
0:00 - GMT
# Benin
# Whitman says they switched to 1:00 in 1946, not 1934;
# go with Shanks & Pottenger.
Zone Africa/Porto-Novo 0:10:28 - LMT 1912 Jan 1
0:00 - GMT 1934 Feb 26
1:00 - WAT
# São Tomé and Príncipe
Zone Africa/Sao_Tome 0:26:56 - LMT 1884
-0:36:32 - LMT 1912 # Lisbon Mean Time

9
checktab.awk
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@ -17,28 +17,19 @@ BEGIN {
if (zone_table == "zone1970.tab") {
tztab["Africa/Addis_Ababa"] = 1
tztab["Africa/Asmara"] = 1
tztab["Africa/Bangui"] = 1
tztab["Africa/Blantyre"] = 1
tztab["Africa/Brazzaville"] = 1
tztab["Africa/Bujumbura"] = 1
tztab["Africa/Dar_es_Salaam"] = 1
tztab["Africa/Djibouti"] = 1
tztab["Africa/Douala"] = 1
tztab["Africa/Gaborone"] = 1
tztab["Africa/Harare"] = 1
tztab["Africa/Kampala"] = 1
tztab["Africa/Kigali"] = 1
tztab["Africa/Kinshasa"] = 1
tztab["Africa/Libreville"] = 1
tztab["Africa/Luanda"] = 1
tztab["Africa/Lubumbashi"] = 1
tztab["Africa/Lusaka"] = 1
tztab["Africa/Malabo"] = 1
tztab["Africa/Maseru"] = 1
tztab["Africa/Mbabane"] = 1
tztab["Africa/Mogadishu"] = 1
tztab["Africa/Niamey"] = 1
tztab["Africa/Porto-Novo"] = 1
tztab["America/Antigua"] = 1
tztab["America/Cayman"] = 1
tztab["Asia/Aden"] = 1