Reset TIme.time?

How cam i reset Time.time
i make a cronometre but when i reset the game the time of cronometre contiouns on it stop
and is a problem because the target is the player make the lower time can help me?

you can always save Time.time then calculate how long it has been from then

function Start()
{
var beginningtime = Time.time;
}

function Update()
{
var ending time = Time.time - begginingtime
}

Dont Func oO