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LibJS: Partially implement the LocalTZA AO

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Intl.DateTimeFormat will invoke this AO with isUTC=true, so this only
implements that branch in LocalTZA.
This commit is contained in:
Timothy Flynn 2022-01-11 23:27:05 -05:00 committed by Linus Groh
parent f6786881aa
commit 8987deb984
2 changed files with 25 additions and 0 deletions
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24
Userland/Libraries/LibJS/Runtime/Date.cpp
View file

@ -10,6 +10,7 @@
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Date.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibTimeZone/TimeZone.h>
#include <time.h>
namespace JS {
@ -315,6 +316,29 @@ u8 week_day(double t)
return static_cast<u8>(modulo(day(t) + 4, 7));
}
// 21.4.1.7 LocalTZA ( t, isUTC ), https://tc39.es/ecma262/#sec-local-time-zone-adjustment
double local_tza(double time, bool is_utc, Optional<StringView> time_zone_override)
{
// The time_zone_override parameter is non-standard, but allows callers to override the system
// time zone with a specific value without setting environment variables.
auto time_zone = time_zone_override.value_or(TimeZone::current_time_zone());
// 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();
}
// 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)
{

1
Userland/Libraries/LibJS/Runtime/Date.h
View file

@ -104,6 +104,7 @@ u8 min_from_time(double);
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 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);