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LibJS: Implement Date.parse using AK::Time and LibTimeZone

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Fixes #4651
This commit is contained in:
Timothy Flynn 2022-01-14 08:22:46 -05:00 • committed by Linus Groh
parent 7d2834344a
commit aea4f79b57
1 changed files with 9 additions and 17 deletions
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26
Userland/Libraries/LibJS/Runtime/DateConstructor.cpp
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@ -8,6 +8,7 @@
#include <AK/CharacterTypes.h>
#include <AK/GenericLexer.h>
#include <AK/Time.h>
#include <LibCore/DateTime.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Date.h>
@ -99,30 +100,21 @@ static Value parse_simplified_iso8601(const String& iso_8601)
// We parsed a valid date simplified ISO 8601 string.
VERIFY(year.has_value()); // A valid date string always has at least a year.
struct tm tm = {};
tm.tm_year = *year - 1900;
tm.tm_mon = !month.has_value() ? 0 : *month - 1;
tm.tm_mday = day.value_or(1);
tm.tm_hour = hours.value_or(0);
tm.tm_min = minutes.value_or(0);
tm.tm_sec = seconds.value_or(0);
auto time = AK::Time::from_timestamp(*year, month.value_or(1), day.value_or(1), hours.value_or(0), minutes.value_or(0), seconds.value_or(0), milliseconds.value_or(0));
auto time_ms = static_cast<double>(time.to_milliseconds());
// https://tc39.es/ecma262/#sec-date.parse:
// "When the UTC offset representation is absent, date-only forms are interpreted as a UTC time and date-time forms are interpreted as a local time."
time_t timestamp;
if (timezone.has_value() || !hours.has_value())
timestamp = timegm(&tm);
else
timestamp = mktime(&tm);
if (!timezone.has_value() && hours.has_value())
time_ms += local_tza(time_ms, false);
if (timezone == '-')
timestamp += (*timezone_hours * 60 + *timezone_minutes) * 60;
time_ms += *timezone_hours * 3'600'000 + *timezone_minutes * 60'000;
else if (timezone == '+')
timestamp -= (*timezone_hours * 60 + *timezone_minutes) * 60;
time_ms -= *timezone_hours * 3'600'000 + *timezone_minutes * 60'000;
// FIXME: reject timestamp if resulting value wouldn't fit in a double
return Value(1000.0 * timestamp + milliseconds.value_or(0));
// FIXME: reject time_ms if resulting value wouldn't fit in a double
return Value(time_ms);
}
static Value parse_date_string(String const& date_string)