add a timer in game screen

¿¡ HoW to add a timer into game screen ?!

Here’s a tutorial on many types of HUD elements. Jump down to Step 13 for the timer.

Here is a timer that counts upwards in seconds:

var seconds : int;

function Start () {
    seconds = 0;
    InvokeRepeating("Count", 0, 1);
}

function Count () {
    seconds += 1;

}

var native_width : float = 1920;
var native_height : float = 1080;

function OnGUI () {

    var rx : float = Screen.width / native_width;
    var ry : float = Screen.height / native_height;
    GUI.matrix = Matrix4x4.TRS (Vector3(0, 0, 0), Quaternion.identity, Vector3 (rx, ry, 1));
 
    GUI.skin = customSkin;
    GUI.Label(Rect(10, 10, 400, 300), "Time: " + seconds.ToString());
}