I have a problem with stop and resume timer. everytime i'm trying to stop the timer and then resume it again the timer has decreased too much time. Firstly > Timer Start @ 30.0 > @ 27.4 Timer Stop > Wait 1 or 2 seconds and then starts the timer again > The timer goes 25.2 not 27.4. does anyone know why or how?

this is my script.

private var enableTimer = false;
private var remains : float;
var timer : float = 30.0;
var txt : TextMesh;
var objects : GameObject[];

function Start(){
    if(txt == null) GameObject.Find("Timer").GetComponent(TextMesh);
    txt.text = "0";
    remains = timer;
}

function Update () {
    //timer -= Time.time;
    if(enableTimer){
       var clampedTime : float = Mathf.Clamp(Time.time,timer,0);
       clampedTime -=Time.time;
       if(txt) txt.text = clampedTime.ToString("f1");
    }
}


function OnTriggerEnter(col : Collider){
    if(col.gameObject.tag == "Player"){
       enableTimer = true;
    } else enableTimer = false;
}