Action Script 3. Timer MM:SS doesn't work - actionscript-3

Question

I'm creating app and I need to show game time MM:SS format. But I don't know why timer doesn't wrok It shows 0:00.359 (359 of miliseconds) and not change. Where is the problem? I can't find It. Thank you.
var timer:Timer; //import flash.utils.Timer;
var txtTime:TextField;
var tmpTime:Number; //this will store the time when the game is started
//your constructor:
public function MemoryGame()
{
timer = new Timer(1000); //create a new timer that ticks every second.
timer.addEventListener(TimerEvent.TIMER, tick, false, 0, true); //listen for the timer tick
txtTime = new TextField();
addChild(txtTime);
tmpTime = flash.utils.getTimer();
timer.start(); //start the timer
//....the rest of your code
}
private function tick(e:Event):void {
txtTime.text = showTimePassed(flash.utils.getTimer() - tmpTime);
}
//this function will format your time like a stopwatch
function showTimePassed(startTime:int):String {
var leadingZeroMS:String = ""; //how many leading 0's to put in front of the miliseconds
var leadingZeroS:String = ""; //how many leading 0's to put in front of the seconds
var time = getTimer() - startTime; //this gets the amount of miliseconds elapsed
var miliseconds = (time % 1000); // modulus (%) gives you the remainder after dividing,
if (miliseconds < 10) { //if less than two digits, add a leading 0
leadingZeroMS = "0";
}
var seconds = Math.floor((time / 1000) % 60); //this gets the amount of seconds
if (seconds < 10) { //if seconds are less than two digits, add the leading zero
leadingZeroS = "0";
}
var minutes = Math.floor( (time / (60 * 1000) ) ); //60 seconds times 1000 miliseocnds gets the minutes
return minutes + ":" + leadingZeroS + seconds + "." + leadingZeroMS + miliseconds;
}
//in your you-win block of code:
var score = flash.utils.getTimer() - tmpTime; //this store how many milliseconds it took them to complete the game.

Answer 1

Try
timer.currentCount
instead of
flash.utils.getTimer()
It will return the number of times the timer has fired the TIMER-Event.

Answer 2

You need not do this.
var time = getTimer() - startTime;
In your code, startTime is already time elapsed due to
showTimePassed(flash.utils.getTimer() - tmpTime);
OR
you can call
showTimePassed();
and change time calculation as
var time = getTimer() - tmpTime;