Timothy Flynn a4a7efaf5f LibC+LibCore: Use tm_isdst to handle time zone offsets in DST ...

Previously, we were incorrectly assuming that the daylight global
variable indicated whether the current time zone is in DST. In reality,
the daylight variable only indicates whether a time zone *can* be in
DST.

Instead, the tm structure has a tm_isdst member that should be used for
this purpose. Ensure our LibC handles tm_isdst, and avoid errant usage
of the daylight variable in Core::DateTime.

2022-08-02 21:10:44 +01:00

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