$date = new DateTime('22:50:00');
$date->add(new DateInterval('PT01H40M00S'));
echo $date->format('H:i:s');00:30:00
$date->add(new DateInterval('PT01H40M00S'));
echo $date->format('H:i:s');00:30:00
要学会使用手中的工具
(PHP 5 >= 5.3.0)