void msToGregorianDateTime(double ms, bool outputIsUTC, GregorianDateTime& tm)
{
// input is UTC
double dstOff = 0.0;
const double utcOff = getUTCOffset();
if (!outputIsUTC) { // convert to local time
dstOff = getDSTOffset(ms, utcOff);
ms += dstOff + utcOff;
}
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 = dstOff != 0.0;
tm.utcOffset = outputIsUTC ? 0 : static_cast<long>((dstOff + utcOff) / msPerSecond);
tm.timeZone = NULL;
}
double gregorianDateTimeToMS(const GregorianDateTime& t, double milliSeconds, bool inputIsUTC)
{
int day = dateToDayInYear(t.year + 1900, t.month, t.monthDay);
double ms = timeToMS(t.hour, t.minute, t.second, milliSeconds);
double result = (day * msPerDay) + ms;
if (!inputIsUTC) { // convert to UTC
result -= getUTCOffset();
result -= getDSTOffset(result);
}
return result;
}
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) { // convert to UTC
double utcOffset = getUTCOffset(exec);
result -= utcOffset;
result -= getDSTOffset(exec, result, utcOffset);
}
return result;
}
double parseDateFromNullTerminatedCharacters(ExecState* exec, const char* dateString)
{
ASSERT(exec);
bool haveTZ;
int offset;
double ms = WTF::parseDateFromNullTerminatedCharacters(dateString, haveTZ, offset);
if (isnan(ms))
return NaN;
// fall back to local timezone
if (!haveTZ) {
double utcOffset = getUTCOffset(exec);
double dstOffset = getDSTOffset(exec, ms, utcOffset);
offset = static_cast<int>((utcOffset + dstOffset) / WTF::msPerMinute);
}
return ms - (offset * WTF::msPerMinute);
}
// input is UTC
void msToGregorianDateTime(ExecState* exec, double ms, bool outputIsUTC, GregorianDateTime& tm)
{
double dstOff = 0.0;
double utcOff = 0.0;
if (!outputIsUTC) {
utcOff = getUTCOffset(exec);
dstOff = getDSTOffset(exec, ms, utcOff);
ms += dstOff + utcOff;
}
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(dstOff != 0.0);
tm.setUtcOffset(static_cast<long>((dstOff + utcOff) / WTF::msPerSecond));
}
// input is UTC
void msToGregorianDateTime(ExecState* exec, double ms, bool outputIsUTC, GregorianDateTime& tm)
{
double dstOff = 0.0;
double utcOff = 0.0;
if (!outputIsUTC) {
utcOff = getUTCOffset(exec);
dstOff = getDSTOffset(exec, ms, utcOff);
ms += dstOff + utcOff;
}
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 = dstOff != 0.0;
tm.utcOffset = static_cast<long>((dstOff + utcOff) / WTF::msPerSecond);
tm.timeZone = NULL;
}
void msToGregorianDateTime(double ms, bool outputIsUTC, GregorianDateTime& tm)
{
// input is UTC
double dstOff = 0.0;
if (!outputIsUTC) { // convert to local time
dstOff = getDSTOffset(ms);
ms += dstOff + getUTCOffset();
}
tm.second = msToSeconds(ms);
tm.minute = msToMinutes(ms);
tm.hour = msToHours(ms);
tm.weekDay = msToWeekDay(ms);
tm.monthDay = msToDayInMonth(ms);
tm.yearDay = dayInYear(ms, msToYear(ms));
tm.month = msToMonth(ms);
tm.year = msToYear(ms) - 1900;
tm.isDST = dstOff != 0.0;
tm.utcOffset = static_cast<long>((dstOff + getUTCOffset()) / msPerSecond);
tm.timeZone = NULL;
}
