[tz] Propose new zone for Crozet Islands

[Antoine Leca]

Tobias Conradi wrote on 2012-05-12 04:04:27 +0200:
> Current:
> tzdata2012c/zone.tab only has:
> TF	-492110+0701303	Indian/Kerguelen
>
> Note: I couldn't find the rules for Kerguelen

The rules are in antartica (since "forever") even if the islands are
ruled from Reunion which stands in africa file...


> Propose:
> TF	-492110+0701303	Indian/Kerguelen most locations
> TF	-464114+517561	Indian/Crozet Crozet Islands
>
> Coordinates are for the center of the biggest island, Possession
> Island, which is the the Eastern group, which contains also the second
> biggest island.
> http://commons.wikimedia.org/wiki/File:Crozet_Map.png

antartica file have slightly different coordinates (46°S 25' 51", 051°W
51'52") which are the ones for Alfred-Faure base, where most (all?)
humans are.

> Reason:
> http://www.timegenie.com/country.time/tf
> - Île Amsterdam, Île Saint–Paul and Îles Kerguelen are all UTC/GMT +5 hours
> - Îles Crozet is UTC/GMT +4 hours

I confirm that, and sum to the request to create a new timezone. Crozet
Islands have a year-round scientific base (Alfred-Faure) since 1964.

> supported by
> http://fr.wikipedia.org/wiki/%C3%8Eles_Crozet UTC+4
> http://fr.wikipedia.org/wiki/%C3%8Eles_Kerguelen UTC+5

A more official reference can be read (in French) at the bottom of page
30 of http://www.taaf.fr/IMG/pdf/guidehivernant2011.pdf, which spells
the rules using the old
GMT+4 moniker, and as a reference to the Europe/Paris rules.

Since that URL is likely to change (!) you might want to refer to
http://www.taaf.fr (official site of the territory.)

I have no information whether the clocks might have been different from
the "natural" UTC+4 time zone (which extends up to 52°W 30') at any
moment in the past (long-timers and archivists may record unclear and
unchecked informations this about in 1986); so the correct move seems to
create a new zone, perhaps along the attached changes (AFT is my
invention, anything better will be fine with me; I went with
Indian/Alfred_Faure since, unlike Indian/Port_aux_Francais, it fits with
the 14-character limit.)


Antoine

-------------- next part --------------
--- antarctica.orig	Tue Mar 27 17:37:26 2012
+++ antarctica	Wed May 23 11:12:16 2012
@@ -212,7 +212,6 @@
 # French Southern Territories with year-round inhabitants
 #
 # Martin-de-Vivies Base, Amsterdam Island, -374105+0773155, since 1950
-# Alfred-Faure Base, Crozet Islands, -462551+0515152, since 1964
 # Port-aux-Francais, Kerguelen Islands, -492110+0701303, since 1951;
 #	whaling & sealing station operated 1908/1914, 1920/1929, and 1951/1956
 #
@@ -222,6 +221,12 @@
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone Indian/Kerguelen	0	-	zzz	1950	# Port-aux-Francais
 			5:00	-	TFT	# ISO code TF Time
+
+# Alfred-Faure Base, Crozet Islands, -462551+0515152, since 1964
+# Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+Zone Indian/Alfred_Faure	0	-	zzz	1963
+			4:00	-	AFT	# Alfred-Faure Time
+
 #
 # year-round base in the main continent
 # Dumont-d'Urville, Ile des Petrels, -6640+14001, since 1956-11
--- zone.tab.orig	Tue Mar 27 17:37:30 2012
+++ zone.tab	Wed May 23 11:05:20 2012
@@ -371,7 +371,8 @@
 SZ	-2618+03106	Africa/Mbabane
 TC	+2128-07108	America/Grand_Turk
 TD	+1207+01503	Africa/Ndjamena
-TF	-492110+0701303	Indian/Kerguelen
+TF	-492110+0701303	Indian/Kerguelen	most locations
+TF	-462551+0515152	Indian/Alfred_Faure	Crozet Islands
 TG	+0608+00113	Africa/Lome
 TH	+1345+10031	Asia/Bangkok
 TJ	+3835+06848	Asia/Dushanbe