Date::Holidays::Abstract - abstract class for Date::Holidays::* packages


    package Date::Holidays::NN;
    use base qw(Date::Holidays::Abstract);

    sub holidays {

    sub is_holiday {


The documentation describes the lastest release of Date::Holidays::Abstract


This module is an abstract class intended for Date::Holidays::*

The goal is to have all the existing and future modules implement the same methods, so they will have a uniform usage and can be used in polymorphic context or can be easily adapted into the Date::Holidays class.

If you want to use Date::Holidays::Abstract and want to comply with my suggestions to the methods that ought to be implemented, you should implement:



Should at least take 3 arguments:

year, four digits
month, between 1-12
day, between 1-31

The return value from is holiday is either a 1 or 0 indicating true of false, indicating whether the specified date is a holiday in the given country's national calendar.

Additional arguments are at the courtesy of the author of the using module/class.


Should at least take one argument:

year, four digits

Returns a reference to a hash, where the keys are date represented as four digits. The two first representing month (01-12) and the last two representing day (01-31).

The value for the key in question is the local name for the holiday indicated by the day. The resultset will of course vary depending on the given country's national holiday.

Additional arguments are at the courtesy of the author of the using module/class.


Date::Holidays uses the requirements defined by this module and this module can therefore be used with success in conjunction with this.

This is an alternative to a SUPER class. I have given a lot of thought to programming a SUPER class, but since creating a super class for a bunch of modules implementing handling of national holidays, an abstract class seemed a better choice.

A proposed SUPER class for Date::Holidays::* is however implemented see: Date::Holidays::Super implement is_holiday and holidays and expect these to be overloaded.

Overloading would be necessary since nothing intelligent can be said about holidays without specifying a nationality (a part from holidays being nice but too few), and the implemented methods would be empty bodies returning empty result sets.

So I am more for an abstract class and as stated I consider this class an experiment and I have implemented Date::Holidays::Super as an alternative.

Suggestions for changes and extensions are more than welcome.


This class does not implement any methods, it is an abstract class.


This class does not implement any exceptions or error, it is an abstract class.


This class does not implement or require any special environment or configuration apart from what is mentioned in DEPENDENCIES


This class is subclassed from Class::Virtually::Abstract, but holds no direct dependencies apart from that class/module.


No known to the author


No, to the author, known bugs. lease see GitHub for a more precise status.

Only known limitations are:

Requirement for Perl 5.6 for use
Requirement for Perl 5.14 for development



Please report issues via GitHub at:

And follow the bug reporting guidelines available at:


This distribution is currently at 100% test coverage

Please see Coveralls


If you want to contribute to this distribution please consult the contribution guidelines and code of conduct for this project

The distribution relies heavily on Dist::Zilla, but can be developed without using Dist::Zilla, but it is recommended.


Jonas B, (jonasbn) - <>


  • Mohammad S Anwar (GitHub: @manwar, CPAN: MANWAR) for PR resulting in release 0.10

  • Olaf Alders (GitHub: @oalders, CPAN: OALDERS) for bug report resulting in release 0.08


Date-Holidays-Abstract is (C) by Jonas B. (jonasbn) 2004-2019

Date-Holidays-Abstract is released under the Artistic License 2.0