[tz] draft of change summary for next tz release
guy at alum.mit.edu
Wed Sep 18 08:35:33 UTC 2013
On Sep 18, 2013, at 1:06 AM, Lester Caine <lester at lsces.co.uk> wrote:
> I'm trying to help with the idea of the addition of 'thousands' of timezones, and in the end if there is evidence for thousands in the USA then they simply need documenting anyway!
Perhaps they do, but whether that document needs to take the form of thousands of extra tzids is another matter. If they do, we should definitely give packagers of the tzdb, such as OS vendors, the option of *not* providing those thousands of extra tzids.
> I would still like to tidy up 'backward' as well to actually contain dates that a particular alias was used from 'officially'.
As far as I'm concerned, "backward" should contain only links provided for backwards-compatibility reasons when a tzid name change occurred, e.g.
Link America/Halifax Canada/Atlantic
Link America/Winnipeg Canada/Central
Link America/Regina Canada/East-Saskatchewan
Link America/Toronto Canada/Eastern
Link America/Edmonton Canada/Mountain
Link America/St_Johns Canada/Newfoundland
Link America/Vancouver Canada/Pacific
Link America/Regina Canada/Saskatchewan
Link America/Whitehorse Canada/Yukon
Link America/Anchorage US/Alaska
Link America/Adak US/Aleutian
Link America/Phoenix US/Arizona
Link America/Chicago US/Central
Link America/Indiana/Indianapolis US/East-Indiana
Link America/New_York US/Eastern
Link Pacific/Honolulu US/Hawaii
Link America/Indiana/Knox US/Indiana-Starke
Link America/Detroit US/Michigan
Link America/Denver US/Mountain
Link America/Los_Angeles US/Pacific
and, I think:
Link America/Havana Cuba
Link Africa/Cairo Egypt
Link Europe/Dublin Eire
Link Europe/London GB
Link Asia/Hong_Kong Hongkong
Link Atlantic/Reykjavik Iceland
Link Asia/Tehran Iran
Link Asia/Jerusalem Israel
Link America/Jamaica Jamaica
Link Asia/Tokyo Japan
Link Pacific/Kwajalein Kwajalein
Link Africa/Tripoli Libya
Link America/Tijuana Mexico/BajaNorte
Link America/Mazatlan Mexico/BajaSur
Link America/Mexico_City Mexico/General
Link Pacific/Auckland NZ
Link Pacific/Chatham NZ-CHAT
Link America/Denver Navajo
Link Asia/Shanghai PRC
Link Europe/Warsaw Poland
Link Europe/Lisbon Portugal
Link Asia/Taipei ROC
Link Asia/Seoul ROK
Link Asia/Singapore Singapore
Link Europe/Istanbul Turkey
which are, I think, backwards-compatibility links introduced with the naming convention change.
The only historical information associated with them relates to the history of the tzdb *itself*, and that's not of any use to people using the tzdb.
There are also backwards-compatibility links introduced due to city name changes, e.g. not using "foreigner's" names for the city, e.g.
Link Africa/Asmara Africa/Asmera
Link Asia/Kolkata Asia/Calcutta
Link Asia/Chongqing Asia/Chungking
Link Asia/Dhaka Asia/Dacca
Link Asia/Kathmandu Asia/Katmandu
Link Asia/Macau Asia/Macao
The only historical information associated with them is the date when the old names were deprecated, which has nothing to do with the history of time zones.
Some links in "backwards" should perhaps be moved to other files. (The politically-sensitive links might fall into that category.)
More information about the tz