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LibTimeZone: Begin generating GMT offset rules for each time zone

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This is a rather naive implementation, but serves as a first pass at
determining the GMT offset for a time zone at a particular point in
time. This implementation ignores DST (because we are not parsing any
RULE entries yet), and ignores any offset patterns of the form "Mon>4"
or "lastSun".
This commit is contained in:
Timothy Flynn 2022-01-10 16:56:09 -05:00 • committed by Linus Groh
parent e9c42d0bc5
commit 09c0324880
4 changed files with 199 additions and 34 deletions
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9
Userland/Libraries/LibTimeZone/TimeZone.cpp
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@ -24,4 +24,13 @@ Optional<StringView> canonicalize_time_zone(StringView time_zone)
return canonical_time_zone;
}
Optional<i64> __attribute__((weak)) get_time_zone_offset(TimeZone, AK::Time) { return {}; }
Optional<i64> get_time_zone_offset(StringView time_zone, AK::Time time)
{
if (auto maybe_time_zone = time_zone_from_string(time_zone); maybe_time_zone.has_value())
return get_time_zone_offset(*maybe_time_zone, time);
return {};
}
}