#3890: mutt_mktime is ambiguous near DST change
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Reporter: vinc17 | Owner: mutt-dev
Type: defect | Status: new
Priority: major | Milestone:
Component: mutt | Version: 1.7.1
Resolution: | Keywords:
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Comment (by vinc17):
Replying to [comment:7 derekmartin]:
> Oh, the reason it's invalid is that the system's timezone databases know
when DST start and end in your timezone.
This is not sufficient. From the definition of DST, the local time without
DST information is ambiguous for 1 hour in the year. So, during this hour,
it is not possible to know the offset.
For instance, in France, in the night of the DST-to-NoDST change, at 3:00,
one goes back to 2:00. So, if I give the local time 2:30 without
additional information, one cannot know whether it was 2:30 before the
change or 2:30 after the change.
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Ticket URL: <https://dev.mutt.org/trac/ticket/3890#comment:8>
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