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LibJS: Implement the localTZA AO for isUTC=false

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Timothy Flynn 2022-01-14 08:16:50 -05:00 • committed by Linus Groh
parent 820dc1fc53
commit 7d2834344a
1 changed files with 4 additions and 6 deletions
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10
Userland/Libraries/LibJS/Runtime/Date.cpp
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@ -323,20 +323,18 @@ double local_tza(double time, bool is_utc, Optional<StringView> time_zone_overri
// time zone with a specific value without setting environment variables.
auto time_zone = time_zone_override.value_or(TimeZone::current_time_zone());
auto maybe_offset = TimeZone::get_time_zone_offset(time_zone, AK::Time::from_milliseconds(time));
auto offset = maybe_offset.value_or(0) * 1000;
// When isUTC is true, LocalTZA( tUTC, true ) should return the offset of the local time zone from
// UTC measured in milliseconds at time represented by time value tUTC. When the result is added to
// tUTC, it should yield the corresponding Number tlocal.
if (is_utc) {
auto offset = TimeZone::get_time_zone_offset(time_zone, AK::Time::from_milliseconds(time));
return offset.value_or(0) * 1000;
}
// When isUTC is false, LocalTZA( tlocal, false ) should return the offset of the local time zone from
// UTC measured in milliseconds at local time represented by Number tlocal. When the result is subtracted
// from tlocal, it should yield the corresponding time value tUTC.
// FIXME: Implement isUTC=false when any caller needs it.
TODO();
return is_utc ? offset : -offset;
}
// 21.4.1.11 MakeTime ( hour, min, sec, ms ), https://tc39.es/ecma262/#sec-maketime