PHP time()

function calcElapsedTime($time)
{

// calculate elapsed time (in seconds!)

$diff = time()-$time;
$daysDiff = floor($diff/60/60/24);
$diff -= $daysDiff*60*60*24;
$hrsDiff = floor($diff/60/60);
$diff -= $hrsDiff*60*60;
$minsDiff = floor($diff/60);
$diff -= $minsDiff*60;
$secsDiff = $diff;

return ('(elapsed time '.$daysDiff.'d '.$hrsDiff.'h '.$minsDiff.'m '.$secsDiff.'s)');

}