function humanTiming ($time)
{
        $time = strtotime($time);
    $time = time() - $time; // to get the time since that moment

    $tokens = array (
        31536000 => 'year',
        2592000 => 'month',
        604800 => 'week',
        86400 => 'day',
        3600 => 'hour',
        60 => 'minute',
        1 => 'second'
    );

    foreach ($tokens as $unit => $text) {
        if ($time < $unit) continue;
        $numberOfUnits = floor($time / $unit);
        return $numberOfUnits.' '.$text.(($numberOfUnits>1)?'s':'').' ago';
    }

}

$time = '2013-05-25 15:45:22';
echo 'Event happened '.humanTiming($time);

$startDate = 'now';
$endDate = '2013-08-12 14:30:00';

function date_diff($date1, $date2) {
    $diff = strtotime($date2) - strtotime($date1);
    return abs($diff);
}

function seconds2human($ss) {
    $s = $ss % 60;
    $m = floor(($ss % 3600) / 60);
    $h = floor(($ss) / 3600);

    return "$h hours, $m minutes, $s seconds";
}

echo "This file will expire in  ". seconds2human(date_diff($startDate,$endDate));