Date::Manip doesn't use objects at all.

use strict;
use warnings;

use Data::Dumper;
use Date::Manip;
use Date::Manip::Date;

{
   my $date = ParseDate("today");
   print(Dumper($date));
}

{
   my $date = Date::Manip::Date->new();
   $date->parse_format("%Y--%m--%d", "2010--03--30") and die;
   local $Data::Dumper::Maxdepth = 1;
   print(Dumper($date));
}
[download]

$VAR1 = '2010040100:00:00';
$VAR1 = bless( {
                 'err' => '',
                 'args' => 'ARRAY(0x20170a4)',
                 'data' => 'HASH(0x218b084)',
                 'objs' => 'HASH(0x239064)'
               }, 'Date::Manip::Date' );
[download]