How can I stop my timer at 0

Unity Engine
1

So I have a timer which counts down and when it gets to 0 it goes -1, -2 which I don’t want it to do, I just want it to stop a 0

I tried adding this code

if(Time.deltaTime==0)
Debug.Log(“game over”);

but it’s not working

Here is the full code

#pragma strict

var myTimer : float = 5.0;

function Start () {

}

function Update () {
  myTimer -= Time.deltaTime;
  GetComponent(GUIText).text = parseInt(myTimer).ToString();
  
  
  if(Time.deltaTime==0)
   Debug.Log("game over");

}
2

It has been solved, never mind guys

3 
if (myTimer > 0)
    myTimer -= Time.deltaTime;
else
   Debug.Log("game over");
4

Thank you very much, really appreciate it.