I've looked all over the web and everyone can teach you how to make a timer for your game or a countdown, but I can't seem to find out how to add time to an already counting timer.

So here is my counter class:

package 
{
import flash.display.MovieClip;
import flash.display.Stage;
import flash.text.TextField;
import flash.events.Event;
import flash.utils.Timer;
import flash.events.TimerEvent;

public class Score extends MovieClip
{
        public var second:Number = 0;
        public var timer:Timer = new Timer(100);
        private var stageRef:Stage;

        public function Score(stageRef:Stage)
        {
            x = 560.95;
            y = 31.35;
            this.stageRef = stageRef;

            timer.addEventListener(TimerEvent.TIMER, scoreTimer);
            timer.start();
        }

        public function scoreTimer(evt:TimerEvent):void
        {
            second += 1;
            scoreDisplay.text = String("Score: " +second);
        }

That works without any issues or problems and just keeps counting upwards at a speed of 100ms, what I want to know is how to add say 30 seconds if something happens in my game, say you kill an enemy for example.

Please help!