$req_time = got value from db;
($date,$time) = split(/ /, $req_time);
    ($year,$month,$day) = split(/-/, $date);
    ($hour,$min,$sec) = split(/:/, $time);
    $req_date = timelocal($sec, $min, $hour, $day, --$month, $year); 
$rtime = $req_date + 1*60*60;
 my $date1 = strftime '%Y-%m-%d %H:%M:%S', localtime $rtime;