1DateTime::Calendar::JulUisaenr(3C)ontributed Perl DocumeDnattaetTiiomne::Calendar::Julian(3)
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NAME

6       DateTime::Calendar::Julian - Dates in the Julian calendar
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SYNOPSIS

9         use DateTime::Calendar::Julian;
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11         $dt = DateTime::Calendar::Julian->new( year  => 964,
12                                                month => 10,
13                                                day   => 16,
14                                              );
15
16         # convert Julian->Gregorian...
17
18         $dtgreg = DateTime->from_object( object => $dt );
19         print $dtgreg->datetime;  # prints '0964-10-21T00:00:00'
20
21         # ... and back again
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23         $dtjul = DateTime::Calendar::Julian->from_object( object => $dtgreg );
24         print $dtjul->datetime;  # prints '0964-10-16J00:00:00'
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DESCRIPTION

27       DateTime::Calendar::Julian implements the Julian Calendar.  This module
28       implements all methods of DateTime; see the DateTime(3) manpage for all
29       methods.
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METHODS

32       This module implements one additional method besides the ones from
33       DateTime, and changes the output of one other method.
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35       ·   gregorian_deviation
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37           Returns the difference in days between the Gregorian and the Julian
38           calendar.
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40       ·   datetime
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42           This method is now equivalent to:
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44             $dt->ymd('-') . 'J' . $dt->hms(:)
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BACKGROUND

47       The Julian calendar was introduced by Julius Caesar in 46BC.  It
48       featured a twelve-month year of 365 days, with a leap year in February
49       every fourth year.  This calendar was adopted by the Christian church
50       in 325AD.  Around 532AD, Dionysius Exiguus moved the starting point of
51       the Julian calendar to the calculated moment of birth of Jesus Christ.
52       Apart from differing opinions about the start of the year (often
53       January 1st, but also Christmas, Easter, March 25th and other dates),
54       this calendar remained unchanged until the calendar reform of pope
55       Gregory XIII in 1582.  Some backward countries, however, used the
56       Julian calendar until the 18th century or later.
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58       This module uses the proleptic Julian calendar for years before 532AD,
59       or even 46BC.  This means that dates are calculated as if this calendar
60       had existed unchanged from the beginning of time.  The assumption is
61       made that January 1st is the first day of the year.
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63       Note that BC years are given as negative numbers, with 0 denoting the
64       year 1BC (there was no year 0AD!), -1 the year 2BC, etc.
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SUPPORT

67       Support for this module is provided via the datetime@perl.org email
68       list. See http://lists.perl.org/ for more details.
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AUTHOR

71       Eugene van der Pijll <pijll@gmx.net>
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74       Copyright (c) 2003 Eugene van der Pijll.  All rights reserved.  This
75       program is free software; you can redistribute it and/or modify it
76       under the same terms as Perl itself.
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SEE ALSO

79       DateTime
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81       datetime@perl.org mailing list
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83       http://datetime.perl.org/
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87perl v5.28.0                      2003-03-26     DateTime::Calendar::Julian(3)
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