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Re: How to tell (in advance) if a date-time is ambiguous?

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From:
Zefram
Date:
July 11, 2017 13:40
Subject:
Re: How to tell (in advance) if a date-time is ambiguous?
Message ID:
20170711133956.GA17307@fysh.org
Dave Rolsky wrote:
>If you're trying to avoid these, the best advice I could give would be to
>avoid the 12am-4am window, which AFAIK is when most (all?) transitions have
>occurred historically.

Most, but there are both historical and current exceptions.
America/Godthab (west Greenland) changes 22:00->23:00 and 23:00->22:00
(base offset -03:00, with transition at 01:00 UT per EU rules).
America/Santiago (Chile) changes 00:00->23:00.  Pacific/Easter (Easter
Island) changes 22:00->23:00 and 22:00->21:00 (changing at the same
time as Chile, but with base offset 2 hours to the west).  Historically,
Africa/Casablanca (Morocco) changed 12:00->13:00 in a DST change in 1967.
And Pacific/Kwajalein (part of the Marshall Islands) jumped across the
international date line in the unfashionable direction, repeating 23
hours of 1969-09-30.

-zefram

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