(PHP 4 >= 4.1.0, PHP 5)
cal_to_jd — Converts from a supported calendar to Julian Day Count
cal_to_jd() calculates the Julian day count for a date in the specified calendar . Supported calendar s are CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH and CAL_FRENCH.
Calendar to convert from, one of CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH or CAL_FRENCH.
The month as a number, the valid range depends on the calendar
The day as a number, the valid range depends on the calendar
The year as a number, the valid range depends on the calendar
A Julian Day number.