FAQ 4.16 How can I find the Julian Day?
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From: PerlFAQ Server on 30 Apr 2010 12:00 This is an excerpt from the latest version perlfaq4.pod, which comes with the standard Perl distribution. These postings aim to reduce the number of repeated questions as well as allow the community to review and update the answers. The latest version of the complete perlfaq is at http://faq.perl.org . -------------------------------------------------------------------- 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 -------------------------------------------------------------------- The perlfaq-workers, a group of volunteers, maintain the perlfaq. They are not necessarily experts in every domain where Perl might show up, so please include as much information as possible and relevant in any corrections. The perlfaq-workers also don't have access to every operating system or platform, so please include relevant details for corrections to examples that do not work on particular platforms. Working code is greatly appreciated. If you'd like to help maintain the perlfaq, see the details in perlfaq.pod. |