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6 calls to date_is_leap_year() in Date 6

date_calc_days_in_month in date_php4/date_php4_calc.inc
Find the number of days in the given month.
date_calc_gregorian_to_ISO in date_php4/date_php4_calc.inc
Converts from Gregorian Year-Month-Day to ISO Year-WeekNumber-WeekDay
date_calc_julian_date in date_php4/date_php4_calc.inc
Returns number of days since 31 December of year before given date.
date_php4.inc in date_php4/date_php4.inc
_date_getdate in date_php4/date_php4_lib.inc
Low-level function that returns the getdate() array for pre-1970 and post-2038 dates.
_date_mktime in date_php4/date_php4_lib.inc
Low level function to create mktime() for pre-1970 and post 2038 dates.