This outputs the days:

#!/usr/bin/perl -l

use strict;
use warnings;
use Data::Dumper;
use DateTime;

my $bday = DateTime->new(
    year       => 2009,
    month      => 3,
    day        => 13,
    hour       => 8,
    minute     => 16,
    second     => 30,
    nanosecond => 0,
    time_zone  => 'America/New_York',
);

my $now = DateTime->now;

my $dtd1 = $now->subtract_datetime($bday);

print $dtd1->years       . ' years';
print $dtd1->months      . ' months';
print $dtd1->weeks       . ' weeks';       
print $dtd1->days        . ' days';       
print $dtd1->hours       . ' hours';        
print $dtd1->minutes     . ' minutes';     
print $dtd1->seconds     . ' seconds';      
print $dtd1->nanoseconds . ' nanoseconds';
[download]

Output:

3  years 
4  months
3  weeks
0  days
18 hours
7  minutes
49 seconds
0  nanoseconds
[download]

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