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:

Code (JavaScript):

1. var seconds : int;
2.  
3. function Start () {
4.     seconds = 0;
5.     InvokeRepeating("Count", 0, 1);
6. }
7.  
8. function Count () {
9.     seconds += 1;
10.  
11. }
12.  
13. var native_width : float = 1920;
14. var native_height : float = 1080;
15.  
16. function OnGUI () {
17.  
18.     var rx : float = Screen.width / native_width;
19.     var ry : float = Screen.height / native_height;
20.     GUI.matrix = Matrix4x4.TRS (Vector3(0, 0, 0), Quaternion.identity, Vector3 (rx, ry, 1));
21.  
22.     GUI.skin = customSkin;
23.     GUI.Label(Rect(10, 10, 400, 300), "Time: " + seconds.ToString());
24. }
25.