jdtounix

Description

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 ). The time returned is localtime (and not GMT).

See also unixtojd().

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27-Jan-2005 10:50


Warning: the calender functions involving julian day operations seem to ignore the decimal part of the julian day count.



This means that the returned date is wrong 50% of the time, since a julian day starts at decimal .5 .  Take care!!

seb at carbonauts dot com
22-Oct-2003 03:10


Remember that unixtojd() assumes your timestamp is in GMT, but jdtounix() returns a timestamp in localtime.



This fooled me a few times.  



So if you have:



$timestamp1 = time();

$timestamp2 = jdtounix(unixtojd($timestamp1));



Unless your localtime is the same as GMT, $timestamp1 will not equal $timestamp2.

pipian at pipian dot com
13-Jun-2003 12:29


Remember that UNIX timestamps indicate a number of seconds from midnight of January 1, 1970 on the Gregorian calendar, not the Julian Calendar.

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