int jdtounix(int $jday)
This function will return a Unix timestamp corresponding to the Julian Day given in
jday is not inside the Unix epoch (Gregorian years between 1970 and 2037 or 2440588 <=
jday <= 2465342 ). The time returned is localtime (and not GMT).
The unix timestamp for the start of the given julian day.
- int $jday: A julian day number between 2440588 and 2465342.