Flash Timer

import flash.utils.Timer;

import flash.events.TimerEvent;

var time:int=300

var myTimer:Timer = new Timer(1000, 300);

myTimer.addEventListener(TimerEvent.Timer, runOnce);

myTimer.start();

function runOnce(event:TimerEvent):void {

              time--

              lee.text=String(time);

}

import flash.utils.Timer;
import flash.events.TimerEvent;

var time:int=0

var myTimer:Timer = new Timer(10, 3000);// 1 second
myTimer.addEventListener(TimerEvent.TIMER, runOnce);
myTimer.start();

function runOnce(event:TimerEvent):void {
time++
clock.text=String(time);
}