Linus Groh de2e95b278 LibJS: Ensure make_day()'s temporary Core::DateTime is treated as UTC ...

DateTime::create() and subsequently DateTime::set_time() uses mktime()
internally to ensure out-of-range input values still result in a valid
date (Jan 32 -> Feb 1 etc.).
This however also means that the input is treated as local time, and
then shifted to UTC accordingly for the returned time_t - it is however
already in UTC in this case! The temporary solution is simply to set the
"TZ" environment variable to "UTC" and back after create(). The proper
solution is probably to have better timezone support in Core::DateTime.
This should only affect Lagom, as serenity itself has no timezone
support yet and always assumes UTC.

2021-10-30 10:15:49 +02:00

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