$tt=time(); // time stamp of today.
echo "Time Stamp = $tt ";
$day_jd=unixtojd($tt);
echo "Julian Day by using unixtojd() : $day_jd ";
The output is here
By using unix time stamp we can generate Julian date calendar or any other calendar.
unixtojd(time_stamp);
Time Stamp = 1725728515 Julian Day by using unixtojd() : 2460561
Julian Day count to Unix timestamp