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 ). The time returned is localtime (and not GMT).
Parameters
jday
A julian day number between 2440588 and 2465342.
Return Values
The unix timestamp for the start of the given julian day.
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