[tz] Proposal for new rules

Scott Atwood scott.roy.atwood at gmail.com
Thu Aug 29 23:07:05 UTC 2013

On Thursday, August 29, 2013, Lester Caine wrote:

> Zefram wrote:
>> In the above, I'm using the term "country" as a synonym for "ISO 3166
>> region", by which I mean a region to which ISO 3166 assigns a regular
>> alpha-2 code.  I think this is uncontroversial ground on this list,
>> but worth explicating in this context: the biggest political question
>> we're ducking is what constitutes a country.
> Looking at the genealogical data, country boundaries change over time, so
> we can not rely on the current map of the world if the job is to be done
> correctly. No doubt in the future some areas will move from one time zone
> to another due to 'political' changes.

Setting aside the current controversy, this kind of situation is already
handled quite well:  if after 1970, a chunk of territory switches from a
country with one history of time zone rules to a another country with a
different history, that by necessity forks that chunk of territory into a
new time zone.  If territory is exchanged between countries with identical
time zone histories, no new zone need be forked.

Scott Atwood
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