$fark = "3";


$saatfark = (date("H") + ($fark));


$zaman1 = mktime( $saatfark, date("i"), date("s"), date("m"), date("d"), date("Y"));


$tarih = date("Y-m-d",$zaman1);


$zaman = date("H:i:s",$zaman1);


echo $zaman ;