How do I make a lap timer?

[TheDefibulator]

I’m making a racing game for a school project and I need to have a timer that counts upward from start until the player crosses the finish line. I also need the timer to go back a certain increment when the player hits an object (i.e. +Time) and then go forward when the player collides with an object like a barricade. Please help!

I figured out the timer code:

private var timerText:GUIText;

private var startTime:float = 0         
    
function Update () {
    
    timerText = gameObject.GetComponent(GUIText);
    
    timeTaken = startTime + Time.time;
    
    timerText.text = FormatTime (timeTaken);
    
    }           
    
function FormatTime (time : float){
    
    var minutes : int = Mathf.Floor(time / 60.0);
    
    var seconds : int = Mathf.Floor(time - minutes * 60.0);
    
    var milliseconds = time - Mathf.Floor(time);
    
    milliseconds = Mathf.Floor(milliseconds * 1000.0);
    
    var sMinutes = "00" + minutes.ToString();
    
    sMinutes = sMinutes.Substring(sMinutes.Length-2);
    
    var sSeconds = "00" + seconds.ToString();
    
    sSeconds = sSeconds.Substring(sSeconds.Length-2);
    
    var sMilliseconds = "000" + milliseconds.ToString();
    
    sMilliseconds = sMilliseconds.Substring(sMilliseconds.Length-3);
            
    timeText = sMinutes + ":" + sSeconds + ":" + sMilliseconds;
        
    return timeText;
    
        }

Now I just have to figure out how to add or subtract time depending on which object the player collides with. Thanks

[fafase]

If you have not started running or finished the race is false, no counting. The rest of the time timer is increased at a rate of 1 per second. If you enter a trigger that is a counter up then you decrease the counter.

var timer:float;
var running:boolean = false;
function Update(){
   if(!running)return;
   timer += Time.deltaTime;
}

function OnTriggerEnter(col:Collider){
   if(col.gameObject.CompareTag("CounterUp"))timer -= value;
   else if (col.gameObject.CompareTag("EndRace")) running = false;
}

[TheDefibulator]

Any other suggestions?