PHP: PHP5.2 date diff function

gistfile1

//Used for date difference calculations
function dateTimeDiff($date1, $date2) {
    $alt_diff = new stdClass();
    $alt_diff->y =  floor(abs($date1->format('U') - $date2->format('U')) / (60*60*24*365));
    $alt_diff->m =  floor((floor(abs($date1->format('U') - $date2->format('U')) / (60*60*24)) - ($alt_diff->y * 365))/30);
    $alt_diff->d =  floor(floor(abs($date1->format('U') - $date2->format('U')) / (60*60*24)) - ($alt_diff->y * 365) - ($alt_diff->m * 30));
    $alt_diff->h =  floor( floor(abs($date1->format('U') - $date2->format('U')) / (60*60)) - ($alt_diff->y * 365*24) - ($alt_diff->m * 30 * 24 )  - ($alt_diff->d * 24) );
    $alt_diff->i = floor( floor(abs($date1->format('U') - $date2->format('U')) / (60)) - ($alt_diff->y * 365*24*60) - ($alt_diff->m * 30 * 24 *60)  - ($alt_diff->d * 24 * 60) -  ($alt_diff->h * 60) );
    $alt_diff->s =  floor( floor(abs($date1->format('U') - $date2->format('U'))) - ($alt_diff->y * 365*24*60*60) - ($alt_diff->m * 30 * 24 *60*60)  - ($alt_diff->d * 24 * 60*60) -  ($alt_diff->h * 60*60) -  ($alt_diff->i * 60) );
    $alt_diff->invert =  (($date1->format('U') - $date2->format('U')) > 0)? 0 : 1 ;
    return $alt_diff;
}