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Posted by PerlFAQ Server on May 6, 2008, 9:03 pm
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This is an excerpt from the latest version perlfaq4.pod, which
comes with the standard Perl distribution. These postings aim to
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4.16: How can I find the Julian Day?
(contributed by brian d foy and Dave Cross)
You can use the "Time::JulianDay" module available on CPAN. Ensure that
you really want to find a Julian day, though, as many people have
different ideas about Julian days. See
http://www.hermetic.ch/cal_stud/jdn.htm for instance.
You can also try the "DateTime" module, which can convert a date/time to
a Julian Day.
$ perl -MDateTime -le'print DateTime->today->jd'
2453401.5
Or the modified Julian Day
$ perl -MDateTime -le'print DateTime->today->mjd'
53401
Or even the day of the year (which is what some people think of as a
Julian day)
$ perl -MDateTime -le'print DateTime->today->doy'
31
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