double gregorianDateTimeToMS(VM& vm, const GregorianDateTime& t, double milliSeconds, WTF::TimeType inputTimeType)
{
double day = dateToDaysFrom1970(t.year(), t.month(), t.monthDay());
double ms = timeToMS(t.hour(), t.minute(), t.second(), milliSeconds);
double localTimeResult = (day * WTF::msPerDay) + ms;
double localToUTCTimeOffset = inputTimeType == LocalTime
? localTimeOffset(vm, localTimeResult, inputTimeType).offset : 0;
return localTimeResult - localToUTCTimeOffset;
}
double gregorianDateTimeToMS(ExecState* exec, const GregorianDateTime& t, double milliSeconds, bool inputIsUTC)
{
double day = dateToDaysFrom1970(t.year + 1900, t.month, t.monthDay);
double ms = timeToMS(t.hour, t.minute, t.second, milliSeconds);
double result = (day * WTF::msPerDay) + ms;
if (!inputIsUTC)
result -= localTimeOffset(exec, result).offset;
return result;
}
double parseDateFromNullTerminatedCharacters(VM& vm, const char* dateString)
{
bool haveTZ;
int offset;
double localTimeMS = WTF::parseDateFromNullTerminatedCharacters(dateString, haveTZ, offset);
if (std::isnan(localTimeMS))
return std::numeric_limits<double>::quiet_NaN();
// fall back to local timezone.
if (!haveTZ)
offset = localTimeOffset(vm, localTimeMS, WTF::LocalTime).offset / WTF::msPerMinute;
return localTimeMS - (offset * WTF::msPerMinute);
}
// input is UTC
void msToGregorianDateTime(VM& vm, double ms, WTF::TimeType outputTimeType, GregorianDateTime& tm)
{
LocalTimeOffset localTime;
if (outputTimeType == WTF::LocalTime) {
localTime = localTimeOffset(vm, ms);
ms += localTime.offset;
}
const int year = msToYear(ms);
tm.setSecond(msToSeconds(ms));
tm.setMinute(msToMinutes(ms));
tm.setHour(msToHours(ms));
tm.setWeekDay(msToWeekDay(ms));
tm.setYearDay(dayInYear(ms, year));
tm.setMonthDay(dayInMonthFromDayInYear(tm.yearDay(), isLeapYear(year)));
tm.setMonth(monthFromDayInYear(tm.yearDay(), isLeapYear(year)));
tm.setYear(year);
tm.setIsDST(localTime.isDST);
tm.setUtcOffset(localTime.offset / WTF::msPerSecond);
}
// input is UTC
void msToGregorianDateTime(ExecState* exec, double ms, bool outputIsUTC, GregorianDateTime& tm)
{
LocalTimeOffset localTime(false, 0);
if (!outputIsUTC) {
localTime = localTimeOffset(exec, ms);
ms += localTime.offset;
}
const int year = msToYear(ms);
tm.second = msToSeconds(ms);
tm.minute = msToMinutes(ms);
tm.hour = msToHours(ms);
tm.weekDay = msToWeekDay(ms);
tm.yearDay = dayInYear(ms, year);
tm.monthDay = dayInMonthFromDayInYear(tm.yearDay, isLeapYear(year));
tm.month = monthFromDayInYear(tm.yearDay, isLeapYear(year));
tm.year = year - 1900;
tm.isDST = localTime.isDST;
tm.utcOffset = localTime.offset / WTF::msPerSecond;
tm.timeZone = NULL;
}
