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@ 2013-02-08T12:37:17Z

<?php

date_default_timezone_set('Asia/Tokyo');  // you are required to set a timezone

$date1 = new DateTime('2013-03-01');
$date2 = new DateTime('2013-04-01');

$diff = $date1->diff($date2);

echo (($diff->format('%y') * 12) + $diff->format('%m')) . " full months difference";

Output
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date_default_timezone_set: documentation ( source)

preferences:dark modelive preview

43.54 ms | 402 KiB | 5 Q