The DateTime project is supposed to make all other Perl date and time handling modules obsolete and replace them with a consistant set of modules.

To do what you want with the DateTime modules, you'd use DateTime::Format::Strptime like this:

#!/usr/bin/perl

use strict;
use warnings;

use DateTime::Format::Strptime;

my $str = '20031105';

my $parser = DateTime::Format::Strptime->new(pattern => '%Y%m%d');

my $dt = $parser->parse_datetime($str);

$dt->add(months => 3);

# standard date format
print $dt->date, "\n";
# or in your original formay
print $parser->format_datetime($dt), "\n";
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