[tz] TZ Data Base Questions

J Andrew Lipscomb silverpie2 at mac.com
Wed Apr 1 18:42:16 UTC 2020

Envoyé de mon iPad

> Le 1 avr. 2020 à 14:23, Paul Eggert <eggert at cs.ucla.edu> a écrit :
> On 4/1/20 8:30 AM, Dustin J. Dirth via tz wrote:
>>   *   If an entity breaks off from a current time zone, does the data base fork the current time zone(A) and add a new time zone(B) with time zone B having all the historical data of A?
> Yes. For the most recent example of this, see the introduction of Asia/Qostanay (by a split from Asia/Qyzylorda) in:
> https://github.com/eggert/tz/commit/6fb0daf8a1906e47a96a5f035d723468fe996461

Keeping in mind that A will always be the area containing the named city. So, for example, if New York changes time zone, it keeps America/New_York and the rest of the zone becomes America/Philadelphia.

(A question: Is it the legal city or the metro area whose size is measured? This matters if IL or CO shifts: the remaining largest cities proper are Houston and Albuquerque, but the largest metros are Dallas and Salt Lake City.)

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