The problem is that the duration is expressed in months (as shown below). Converting month to days is not a formatting issue. I don't see how that module would help. Am I missing something? 
$VAR1 = bless( {
                 'seconds' => 0,
                 'minutes' => 0,
                 'end_of_month' => 'wrap',
                 'nanoseconds' => 0,
                 'days' => 0,
                 'months' => 13
               }, 'DateTime::Duration' );

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In reply to Re^2: How can I count the days between two dates? by ikegami
in thread How can I count the days between two dates? by zby

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