FAQ 4.16: How can I find the Julian Day?

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4.16: How can I find the Julian Day?

    Use the Time::JulianDay module (part of the Time-modules bundle
    available from CPAN.)

    Before you immerse yourself too deeply in this, be sure to verify that
    it is the *Julian* Day you really want. Are you interested in a way of
    getting serial days so that you just can tell how many days they are
    apart or so that you can do also other date arithmetic? If you are
    interested in performing date arithmetic, this can be done using modules
    Date::Manip or Date::Calc.

    There is too many details and much confusion on this issue to cover in
    this FAQ, but the term is applied (correctly) to a calendar now
    supplanted by the Gregorian Calendar, with the Julian Calendar failing
    to adjust properly for leap years on centennial years (among other
    annoyances). The term is also used (incorrectly) to mean: [1] days in
    the Gregorian Calendar; and [2] days since a particular starting time or
    `epoch', usually 1970 in the Unix world and 1980 in the MS-DOS/Windows
    world. If you find that it is not the first meaning that you really
    want, then check out the Date::Manip and Date::Calc modules. (Thanks to
    David Cassell for most of this text.)


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