view release on metacpan or  search on metacpan

lib/Date/Indiction.pm  view on Meta::CPAN

  Date::Indiction::set_aera('christian');
  $indict = indiction(2016, 12); # December 2016 AD

=head1 DESCRIPTION

Indiction (called I<indict> in Russian chronicles) is the number of
the year in a 15-year cycle, starting from September 1, 312 AD. It can
be calculated for either Byzantine year (Anno Mundi, AM, old Russian
style with the epoch on March 1, 5508 BCE) or Christian year (Anno
Domini, AD). The formulae are, respectively,

    I = AM % 15

    I = (AD + 3) % 15

adding 1 for dates after the 1st of September since indictions change
on this date. (Other counting bases did exist in Western Europe,
however not covered by this module.) See Klimishin I.A. "Calendar and
Chronology". Moscow, Nauka, 1985, pp. 82-85.