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Windows has an unfortunate handling of time zones, which means that when
the time zone is changed (or DST changes), the timestamps of files also
appear to change.
This means that after such a change, git-annex will see new mtimes, and
want to re-checksum every file in the repo.
The best way to fix this seems to be to normalize the timestamp returned by
getFileStatus, which is relative to the current time zone, to be relative
to UTC. (As is always the case on Unix, of course).
However, to do that, I need to know the current timezone.
Unfortunately, Data.Time.LocalTime.getCurrentTimeZone doesn't seem to really
work on windows. It always returns a time zone 60 minutes from UTS in my tests,
no matter what the zone really is. I need to test this more widely and file
a GHC bug if appropriate.
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