How can i Set my Clock

Store a "start time" and subtract it from the "current time", this will give you a timespan of the elapsed time. Call the Reset function to start back at 00:00:00.

 var date : System.DateTime;
 
 //sets something allowing you to populate it with the date and time
 private var text : String;
 
 var startDateTime : System.DateTime;
       
 function Start()
 {
     Reset();
 }
         
 public function Reset()
 {
     startDateTime = System.DateTime.Now;
 }
        
 function Update()
 {
     //tells the var to look for the precise moment you are at
     var date = System.DateTime.Now;
 
     //converts the above var to a readable string
     //text = date.ToString("HH:mm:ss");
 
     // calculate the timespan between the start time and current time
     var timespan : System.TimeSpan = date - startDateTime;
     text = String.Format("{0}:{1}:{2}",
         timespan.Hours.ToString("00"),
         timespan.Minutes.ToString("00"),
         timespan.Seconds.ToString("00"));
 
     //prints it to inspector
     GetComponent(TextMesh).text = text; 
 }