optimized ->from_day_of_year, only invoke ->_month_length once per iteration
optimized ->from_day_of_year, only invoke ->_month_length once per iteration

chansen/DateTime.pm,1nickt/DateTime.pm,autarch/DateTime.pm,chansen/DateTime.pm,chansen/DateTime.pm,1nickt/DateTime.pm,1nickt/DateTime.pm,autarch/DateTime.pm