Is there a list of "current" time zones?
philip.howell at evalua.com.au
Tue Jul 10 02:21:25 UTC 2007
In the tzdata tarball is a file called zone.tab. It lists the current
time zones grouped by country code.
Tim Klein wrote:
> I'm new here. As I look through the tz database, and the archives of
> this mailing list, I realize what a phenomenal effort you folks have
> put in, to make all of this information available. Thank you for all
> you've done!
> A question...
> I'm helping to write an application that needs a menu for the user to
> choose what time zone they live in. With ~400 time zones in the
> database, that'd be a pretty daunting pull-down menu.
> But as I understand it, a significant fraction of the ~400 time zones
> exist only for historical reasons. Since our application will deal
> only with current and future times, historical distinctions don't
> matter, and we'd like the menu to show only the subset of time zones
> that are currently "in effect". (And we don't mind if it isn't
> painstakingly accurate or updated in real time.)
> Has anyone created such a list? Or maybe an algorithm (if not code)
> for generating one from the full database?
> I see that this question has come up in the past. To quote from the
>> From: "Andy Lipscomb" <AndyLipscomb at decosimo.com>
>> Perhaps a better term would be "historical" time zones. This would in
>> fact be a useful distinction, since only a relatively small subset of
>> the timezones are necessary for applications that look only
>> forward--these would be the first set to present to a user for
>> selecting a time zone, with a "show all" option to get the complete
>> list. (For example, the 50 United States can be covered on a
>> forward-looking basis by eight zones--New York, Chicago, Denver,
>> Phoenix, Los Angeles, Anchorage, Adak, and Honolulu. And if one takes
>> as irrevocable the power of the EU over DST dates, then--for
>> example--London, Paris, and Helsinki would cover that entire area,
>> except for the different abbreviations used in the three +0 countries.)
>> From: Paul Eggert [mailto:eggert at CS.UCLA.EDU]
>> Sent: November 6, 2006 12:13 PM
>>> Is there any way to flag some of the old historical zones such that
>>> they don't appear when running "tzselect"?
>> We could have a table for people who don't care about historical
>> times, which maps zone names to "modern" zone names, and tzselect
>> could have an option to use that table.
> Thank you very much for any wisdom on this subject!
> Tim Klein
> Dallas, Texas, USA
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