这里是您的答案。$current_date = date('d-M-Y g:i:s A'); echo $current_date."<br/>"; $current_time = strtotime($current_date); $frac = 900; $r = $current_time % $frac; $new_time = $current_time + ($frac-$r); $new_date = date('d-M-Y g:i:s A', $new_time); echo $new_date."<br/>"; LIVE DEMO