PHP Program to find the difference between two dates

<?php
    $date1 = "2007-03-24";
    $date2 = "2009-06-26";

    $diff = abs(strtotime($date2) - strtotime($date1));

    $years = floor($diff / (365*60*60*24));
    $months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
    $days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));

    printf("%d years, %d months, %d days\n", $years, $months, $days);
?>

Output

2 years, 3 months, 5 days