bool DateComponents::setMillisecondsSinceEpochForWeek(double ms) {
m_type = Invalid;
if (!std::isfinite(ms))
return false;
ms = round(ms);
m_year = msToYear(ms);
if (m_year < minimumYear() || m_year > maximumYear())
return false;
int yearDay = dayInYear(ms, m_year);
int offset = offsetTo1stWeekStart(m_year);
if (yearDay < offset) {
// The day belongs to the last week of the previous year.
m_year--;
if (m_year <= minimumYear())
return false;
m_week = maxWeekNumberInYear();
} else {
m_week = ((yearDay - offset) / 7) + 1;
if (m_week > maxWeekNumberInYear()) {
m_year++;
m_week = 1;
}
if (m_year > maximumYear() ||
(m_year == maximumYear() && m_week > maximumWeekInMaximumYear))
return false;
}
m_type = Week;
return true;
}
static SoupDate* msToSoupDate(double ms)
{
int year = msToYear(ms);
int dayOfYear = dayInYear(ms, year);
bool leapYear = isLeapYear(year);
return soup_date_new(year, monthFromDayInYear(dayOfYear, leapYear), dayInMonthFromDayInYear(dayOfYear, leapYear), msToHours(ms), msToMinutes(ms), static_cast<int>(ms / 1000) % 60);
}
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;
}
bool DateComponents::setMillisecondsSinceEpochForDateInternal(double ms) {
m_year = msToYear(ms);
int yearDay = dayInYear(ms, m_year);
m_month = monthFromDayInYear(yearDay, isLeapYear(m_year));
m_monthDay = dayInMonthFromDayInYear(yearDay, isLeapYear(m_year));
return true;
}
static inline int msToMonth(double ms)
{
int step;
int year = msToYear(ms);
int d = dayInYear(ms, year);
if (d < (step = 31))
return 0;
step += (isInLeapYear(ms) ? 29 : 28);
if (d < step)
return 1;
if (d < (step += 31))
return 2;
if (d < (step += 30))
return 3;
if (d < (step += 31))
return 4;
if (d < (step += 30))
return 5;
if (d < (step += 31))
return 6;
if (d < (step += 31))
return 7;
if (d < (step += 30))
return 8;
if (d < (step += 31))
return 9;
if (d < (step += 30))
return 10;
return 11;
}
static inline int minimumYearForDST()
{
// Because of the 2038 issue (see maximumYearForDST) if the current year is
// greater than the max year minus 27 (2010), we want to use the max year
// minus 27 instead, to ensure there is a range of 28 years that all years
// can map to.
return std::min(msToYear(jsCurrentTime()), maximumYearForDST() - 27) ;
}
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;
}
// Get the DST offset, given a time in UTC
static double getDSTOffset(double ms)
{
// On Mac OS X, the call to localtime (see getDSTOffsetSimple) will return historically accurate
// DST information (e.g. New Zealand did not have DST from 1946 to 1974) however the JavaScript
// standard explicitly dictates that historical information should not be considered when
// determining DST. For this reason we shift away from years that localtime can handle but would
// return historically accurate information.
int year = msToYear(ms);
int equvalentYear = equivalentYearForDST(year);
if (year != equvalentYear) {
int day = dateToDayInYear(equvalentYear, msToMonth(ms), msToDayInMonth(ms));
ms = (day * msPerDay) + msToMilliseconds(ms);
}
return getDSTOffsetSimple(ms / msPerSecond);
}
// Returns combined offset in millisecond (UTC + DST).
LocalTimeOffset calculateLocalTimeOffset(double ms, TimeType inputTimeType)
{
#if HAVE(TM_GMTOFF)
double localToUTCTimeOffset = inputTimeType == LocalTime ? calculateUTCOffset() : 0;
#else
double localToUTCTimeOffset = calculateUTCOffset();
#endif
if (inputTimeType == LocalTime)
ms -= localToUTCTimeOffset;
// On Mac OS X, the call to localtime (see calculateDSTOffset) will return historically accurate
// DST information (e.g. New Zealand did not have DST from 1946 to 1974) however the JavaScript
// standard explicitly dictates that historical information should not be considered when
// determining DST. For this reason we shift away from years that localtime can handle but would
// return historically accurate information.
int year = msToYear(ms);
int equivalentYear = equivalentYearForDST(year);
if (year != equivalentYear) {
bool leapYear = isLeapYear(year);
int dayInYearLocal = dayInYear(ms, year);
int dayInMonth = dayInMonthFromDayInYear(dayInYearLocal, leapYear);
int month = monthFromDayInYear(dayInYearLocal, leapYear);
double day = dateToDaysFrom1970(equivalentYear, month, dayInMonth);
ms = (day * msPerDay) + msToMilliseconds(ms);
}
double localTimeSeconds = ms / msPerSecond;
if (localTimeSeconds > maxUnixTime)
localTimeSeconds = maxUnixTime;
else if (localTimeSeconds < 0) // Go ahead a day to make localtime work (does not work with 0).
localTimeSeconds += secondsPerDay;
// FIXME: time_t has a potential problem in 2038.
time_t localTime = static_cast<time_t>(localTimeSeconds);
#if HAVE(TM_GMTOFF)
tm localTM;
getLocalTime(&localTime, &localTM);
return LocalTimeOffset(localTM.tm_isdst, localTM.tm_gmtoff * msPerSecond);
#else
double dstOffset = calculateDSTOffset(localTime, localToUTCTimeOffset);
return LocalTimeOffset(dstOffset, localToUTCTimeOffset + dstOffset);
#endif
}
static inline int msToDayInMonth(double ms)
{
int step, next;
int year = msToYear(ms);
int d = dayInYear(ms, year);
if (d <= (next = 30))
return d + 1;
step = next;
next += (isInLeapYear(ms) ? 29 : 28);
if (d <= next)
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 30))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 30))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 30))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 30))
return d - step;
step = next;
return d - step;
}
// Get the DST offset, given a time in UTC
static double calculateDSTOffset(double ms, double utcOffset)
{
// On Mac OS X, the call to localtime (see calculateDSTOffsetSimple) will return historically accurate
// DST information (e.g. New Zealand did not have DST from 1946 to 1974) however the JavaScript
// standard explicitly dictates that historical information should not be considered when
// determining DST. For this reason we shift away from years that localtime can handle but would
// return historically accurate information.
int year = msToYear(ms);
int equivalentYear = equivalentYearForDST(year);
if (year != equivalentYear) {
bool leapYear = isLeapYear(year);
int dayInYearLocal = dayInYear(ms, year);
int dayInMonth = dayInMonthFromDayInYear(dayInYearLocal, leapYear);
int month = monthFromDayInYear(dayInYearLocal, leapYear);
double day = dateToDaysFrom1970(equivalentYear, month, dayInMonth);
ms = (day * msPerDay) + msToMilliseconds(ms);
}
return calculateDSTOffsetSimple(ms / msPerSecond, utcOffset);
}
// 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;
}
// 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;
}
static inline bool isInLeapYear(double ms)
{
return isLeapYear(msToYear(ms));
}
