int jdtounix
(int jday)
This function will return a UNIX timestamp corresponding to the Julian Day given in jday or false if jday is not inside the UNIX epoch (Gregorian years between 1970 and 2037 or 2440588 <= jday <= 2465342 )
See also jdtounix().
Note: This function is only available in PHP versions after PHP4RC1.