Mine

$getuptime = mysql_query("SELECT `uptime` FROM `uptime` ORDER BY `starttime` DESC LIMIT 1");
$uptime3 = mysql_fetch_array($getuptime);

$uptime2 = $uptime3[0];

function sec2hms ($sec, $padHours = false) 
  {

    // holds formatted string
    $hms = "";
    $hours = intval(intval($sec) / 3600); 
    $hms .= ($padHours) 
          ? str_pad($hours, 2, "0", STR_PAD_LEFT). ':'
          : $hours. ':';
     
    $minutes = intval(($sec / 60) % 60); 
    $hms .= str_pad($minutes, 2, "0", STR_PAD_LEFT). ':';
    $seconds = intval($sec % 60); 
    $hms .= str_pad($seconds, 2, "0", STR_PAD_LEFT);
    return $hms;
  }

$uptime = sec2hms($uptime2,1);