static inline double ymdhmsToSeconds(int year, long mon, long day, long hour, long minute, double second)
{
int mday = firstDayOfMonth[isLeapYear(year)][mon - 1];
double ydays = daysFrom1970ToYear(year);
return (second + minute * secondsPerMinute + hour * secondsPerHour + (mday + day - 1 + ydays) * secondsPerDay);
}
int msToYear(double ms)
{
int approxYear = static_cast<int>(floor(ms / (msPerDay * 365.2425)) + 1970);
double msFromApproxYearTo1970 = msPerDay * daysFrom1970ToYear(approxYear);
if (msFromApproxYearTo1970 > ms)
return approxYear - 1;
if (msFromApproxYearTo1970 + msPerDay * daysInYear(approxYear) <= ms)
return approxYear + 1;
return approxYear;
}
double dateToDaysFrom1970(int year, int month, int day)
{
year += month / 12;
month %= 12;
if (month < 0) {
month += 12;
--year;
}
double yearday = floor(daysFrom1970ToYear(year));
ASSERT((year >= 1970 && yearday >= 0) || (year < 1970 && yearday < 0));
return yearday + dayInYear(year, month, day);
}
static int dateToDayInYear(int year, int month, int day)
{
year += month / 12;
month %= 12;
if (month < 0) {
month += 12;
--year;
}
int yearday = static_cast<int>(floor(daysFrom1970ToYear(year)));
int monthday = monthToDayInYear(month, isLeapYear(year));
return yearday + monthday + day - 1;
}
int dayInYear(double ms, int year)
{
return static_cast<int>(msToDays(ms) - daysFrom1970ToYear(year));
}
static inline double msFrom1970ToYear(int year)
{
return msPerDay * daysFrom1970ToYear(year);
}
