Time::JulianDay(3pm) - phpMan

Time::JulianDay(3pm)           User Contributed Perl Documentation           Time::JulianDay(3pm)

NAME
       Time::JulianDay -- Julian calendar manipulations

SYNOPSIS
               use Time::JulianDay

               $jd = julian_day($year, $month_1_to_12, $day)
               $jd = local_julian_day($seconds_since_1970);
               $jd = gm_julian_day($seconds_since_1970);
               ($year, $month_1_to_12, $day) = inverse_julian_day($jd)
               $dow = day_of_week($jd)

               print (Sun,Mon,Tue,Wed,Thu,Fri,Sat)[$dow];

               $seconds_since_jan_1_1970 = jd_secondslocal($jd, $hour, $min, $sec)
               $seconds_since_jan_1_1970 = jd_secondsgm($jd, $hour, $min, $sec)
               $seconds_since_jan_1_1970 = jd_timelocal($sec,$min,$hours,$mday,$month_0_to_11,$year)
               $seconds_since_jan_1_1970 = jd_timegm($sec,$min,$hours,$mday,$month_0_to_11,$year)

DESCRIPTION
       JulianDay is a package that manipulates dates as number of days since some time a long
       time ago.  It's easy to add and subtract time using julian days...

       The day_of_week returned by day_of_week() is 0 for Sunday, and 6 for Saturday and
       everything else is in between.

ERRATA
       Time::JulianDay is not a correct implementation.  There are two problems.  The first
       problem is that Time::JulianDay only works with integers.  Julian Day can be fractional to
       represent time within a day.  If you call inverse_julian_day() with a non-integer time, it
       will often give you an incorrect result.

       The second problem is that Julian Days start at noon rather than midnight.  The
       julian_day() function returns results that are too large by 0.5.

       What to do about these problems is currently open for debate.  I'm tempted to leave the
       current functions alone and add a second set with more accurate behavior.

       There is another implementation in Astro::Time that may be more accurate.

GENESIS
       Written by David Muir Sharnoff <cpan AT dave.org> with help from previous work by
       Kurt Jaeger aka PI <zrzr0111 AT helpdesk.de>
            based on postings from: Ian Miller <ian_m AT cix.uk>; Gary Puckering
       <garyp%cognos.uucp AT uunet.net>      based on Collected Algorithms of the ACM ?; and the
       unknown-to-me author of Time::Local.

LICENSE
       Copyright (C) 1996-1999 David Muir Sharnoff.  License hereby granted for anyone to use,
       modify or redistribute this module at their own risk.  Please feed useful changes back to
       cpan AT dave.org.

perl v5.28.1                                2019-01-23                       Time::JulianDay(3pm)

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