Date::Calc (3p) - Gregorian calendar date calculations
Date::Calc::Object (3p) - Object-oriented add-on for Date::Calc with overloaded operators
Date::Calc::PP (3p) - pure-Perl plug-in for Date::Calc
Date::Calendar (3p) - Calendar objects for different holiday schemes
Date::Calendar::Profiles (3p) - Some sample profiles for Date::Calendar and Date::Calendar::Year
Date::Calendar::Year (3p) - Implements embedded "year" objects for Date::Calendar