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Controls how the number of the year is written. Possible
values are: B<Roman>, which writes it as an uppercase Roman numeral;
B<roman>, which writes it as a lowercase Roman numeral; and B<arabic>,
which writes it as an Arabic numeral. This parameter defaults to the
value of the B<num> parameter below if given, to B<Roman> otherwise.


=item B<auc>

Controls how the "ab Urbe condita" formula is written. Possible values
are: B<abbrev>, which writes it as "AUC", and B<complete> which writes
it in full. This parameter defaults to the value of the B<words>
parameter below if given, and to B<abbrev> otherwise.


=item B<words>

This parameter permits to give a default value different from
B<abbrev> for the parameters B<prefix>, B<mons>, B<fday> and B<auc>.

lib/Date/Roman.pm  view on Meta::CPAN

=back

The others days, where designed counting backward from these fixed
days. It should be remarked that, in counting backward, the romans
used an inclusive counting. That way, for instance,
the 2 Jan was the 4th day before the nones of January (the nones of
January being the 5th of January).

The day before a fixed day was designed by "pridie", abbreviated as
"p.d.". The other days was designed using the formula "ante diem",
abbreviated as "a.d.". For instance, the 16th of April was 
I<ante diem XVI Kalendas Maias>, abbreviated as I<a.d. Kal. Mai.>

In leap years, the supplemental day was obtained by counting two times
the 6th day before the Kalendae of March.

=head2 Counting the years

Romans counted years starting from the mitical foundation of Rome by
Romolus on 21st April, S<753 BC>. Fr instance, year S<2002 AD>