NAME

    DateTime::Format::PGN - a Perl module for parsing and formatting date
    fields in chess game databases in PGN format

VERSION

    version 0.02

SYNOPSIS

        use DateTime::Format::PGN;
     
        my $f = DateTime::Format::PGN->new();
        my $dt = $f->parse_datetime( '2004.04.23' );
     
        # 2004.04.23
        print $f->format_datetime($dt);
        
        # return a DateTime::Incomplete object:
        my $fi = DateTime::Format::PGN->new( { use_incomplete => 1} );
        my $dti = $fi->parse_datetime( '2004.??.??' );
        
        # 2004.??.??
        print $fi->format_datetime($dti);

METHODS

 new(%options)

    Options are Boolean use_incomplete (default 0) and Boolean fix_errors
    (default 0).

        my $f = DateTime::Format::PGN->new({fix_errors => 1, use_incomplete => 1});

    PGN allows for incomplete dates while DateTime does not. All missing
    values in DateTime default to 1. So PGN ????.??.?? becomes 0001.01.01
    with DateTime. If use_incomplete = 1>, a DateTime::Incomplete object is
    used instead where missing values are undef.

    I observed a lot of mistaken date formats in PGN databases downloaded
    from the internet. If fix_errors = 1>, an attempt is made to parse the
    date anyway.

 parse_datetime($string)

    Returns a DateTime object or a DateTime::Incomplete object if option
    use_incomplete = 1>. Since the first recorded chess game was played
    1485, years with a leading 0 are handled as errors.

 format_datetime($datetime)

    Given a DateTime object, this methods returns an PGN date string. If
    the date is incomplete, use a DateTime::Incomplete object (the
    use_incomplete option does not affect the formatting here).

Source

    PGN spec <https://www.chessclub.com/user/help/PGN-spec> by Steven J.
    Edwards.

See also

      * Chess::PGN::Parse

      * DateTime::Incomplete

      * http://datetime.perl.org/

AUTHOR

    Ingram Braun <ibraun@cpan.org>

COPYRIGHT AND LICENSE

    This software is copyright (c) 2016 by Ingram Braun.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.