DateTime::Format::Builder::Parser::Regex - Regex based date parsing


version 0.83


    my $parser = DateTime::Format::Builder->create_parser(
        regex  => qr/^(\d\d\d\d)(\d\d)(\d\d)T(\d\d)(\d\d)(\d\d)$/,
        params => [qw( year month day hour minute second )],


In addition to the common keys, Regex supports:

  • regex

    regex is a regular expression that should capture elements of the datetime string. This is a required element. This is the key whose presence indicates it's a specification that belongs to this class.

  • params

    params is an arrayref of key names. The captures from the regex are mapped to these ($1 to the first element, $2 to the second, and so on) and handed to DateTime->new. This is a required element.

  • extra

    extra is a hashref of extra arguments you wish to give to DateTime->new. For example, you could set the year or time_zone to defaults:

        extra => { year => 2004, time_zone => "Australia/Sydney" },
  • constructor is either an arrayref or a coderef. If an arrayref then the first element is a class name or object, and the second element is a method name (or coderef since Perl allows that sort of thing). The arguments to the call are anything in $p and anything given in the extra option above.

    If only a coderef is supplied, then it is called with arguments of $self, $p and extra.

    In short:

        $self->$coderef( %{$p}, %{ $self->{extra} } );

    The method is expected to return a valid DateTime object, or undef in event of failure, but can conceivably return anything it likes. So long as it's 'true'.

SEE ALSO mailing list.

perl, DateTime, DateTime::Format::Builder


Bugs may be submitted at

I am also usually active on IRC as 'autarch' on irc://


The source code repository for DateTime-Format-Builder can be found at


  • Dave Rolsky <>

  • Iain Truskett <>


This software is Copyright (c) 2020 by Dave Rolsky.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

The full text of the license can be found in the LICENSE file included with this distribution.