Demo of Unix time stamp then converting to Julian Day and displaying the calendar

Convert a timestamp to Julian Day and calendar values

Convert explicitly between Unix timestamp and Julian Day representations.

date_default_timezone_set('UTC');
$timestamp = strtotime('2026-09-14 00:00:00 UTC');
$jd = unixtojd($timestamp);
echo $timestamp . "<br>" . $jd;

Current example first; the detailed examples and demos below are retained for additional learning and comparison.

Subhendu Mohapatra

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Demo of Unix timestamp, Julian day and calendar

Convert a timestamp to Julian Day and calendar values

Subhendu Mohapatra