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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