The following might be useful for anyone who needs it. From PHP Version > 5 below new date/time functions added to get difference:

<?php

$datetime1 = new DateTime("2016-01-01");

$datetime2 = new DateTime("2016-01-11");

$difference = $datetime1->diff($datetime2);

echo 'Difference: '.$difference->y.' years, ' 
                   .$difference->m.' months, ' 
                   .$difference->d.' days';

print_r($difference);

?>

Cheers!

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