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LibTimeZone: Begin generating GMT offset rules for each time zone
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".
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4 changed files with 199 additions and 34 deletions
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@ -24,4 +24,13 @@ Optional<StringView> canonicalize_time_zone(StringView time_zone)
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return canonical_time_zone;
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}
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Optional<i64> __attribute__((weak)) get_time_zone_offset(TimeZone, AK::Time) { return {}; }
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Optional<i64> get_time_zone_offset(StringView time_zone, AK::Time time)
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{
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if (auto maybe_time_zone = time_zone_from_string(time_zone); maybe_time_zone.has_value())
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return get_time_zone_offset(*maybe_time_zone, time);
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return {};
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}
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}
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