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the time returned is localtime (and not gmt).
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)
for example, when run in eastern standard time (gmt -0500), the first line below prints "dec 31 1998 20:00:00", while the second prints "jan 01 1999 01:00:00 ".
behaves the same as strftime() except that the time returned is greenwich mean time (gmt). for example, when run in eastern standard time (gmt -0500), the first line below prints "dec 31 1998 20:00:00", while the second prints "jan 01 1999 01:00:00".