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LibJS: Implement the LocalTime, UTC, and TimeWithinDay AOs

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Timothy Flynn 2022-01-14 13:10:07 -05:00 committed by Linus Groh
parent 5f5bcd549e
commit d93713b874
Notes: sideshowbarker 2024-07-18 03:35:30 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/d93713b8744
Pull-request: https://github.com/SerenityOS/serenity/pull/11913
Reviewed-by: https://github.com/linusg ✅
Reviewed-by: https://github.com/nico
2 changed files with 24 additions and 0 deletions
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21
Userland/Libraries/LibJS/Runtime/Date.cpp
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@ -337,6 +337,20 @@ double local_tza(double time, bool is_utc, Optional<StringView> time_zone_overri
return is_utc ? offset : -offset;
}
// 21.4.1.8 LocalTime ( t ), https://tc39.es/ecma262/#sec-localtime
double local_time(double time)
{
// 1. Return t + LocalTZA(t, true).
return time + local_tza(time, true);
}
// 21.4.1.9 UTC ( t ), https://tc39.es/ecma262/#sec-utc-t
double utc_time(double time)
{
// 1. Return t - LocalTZA(t, false).
return time - local_tza(time, false);
}
// 21.4.1.11 MakeTime ( hour, min, sec, ms ), https://tc39.es/ecma262/#sec-maketime
Value make_time(GlobalObject& global_object, Value hour, Value min, Value sec, Value ms)
{
@ -365,6 +379,13 @@ double day(double time_value)
return floor(time_value / MS_PER_DAY);
}
// TimeWithinDay(t), https://tc39.es/ecma262/#eqn-TimeWithinDay
double time_within_day(double time)
{
// 𝔽(ℝ(t) modulo ℝ(msPerDay))
return modulo(time, MS_PER_DAY);
}
// 21.4.1.12 MakeDay ( year, month, date ), https://tc39.es/ecma262/#sec-makeday
Value make_day(GlobalObject& global_object, Value year, Value month, Value date)
{

3
Userland/Libraries/LibJS/Runtime/Date.h
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@ -105,7 +105,10 @@ u8 sec_from_time(double);
u16 ms_from_time(double);
u8 week_day(double);
double local_tza(double time, bool is_utc, Optional<StringView> time_zone_override = {});
double local_time(double time);
double utc_time(double time);
double day(double);
double time_within_day(double);
Value make_time(GlobalObject& global_object, Value hour, Value min, Value sec, Value ms);
Value make_day(GlobalObject& global_object, Value year, Value month, Value date);
Value make_date(Value day, Value time);