Animate CC2017 AS3 counddown timer

hi

I try to make a countdown timer in animate CC

in 1 layer I have a dynamic text in format 00:00:00:00 and another layer  the following AS3 code to Wight to that dynamic text but nothing happens

name of dynamic text is time_txt

AS3 code

stop();

var year:Number = 17;

var month:Number = 9;

var day : Number = 10;

var finalDate:Date = new Date(year,month-1,day);

var timer:Timer = new Timer(1000);

timer.addEventListener(TimerEvent.TIMER, updateTime);

timer.start();

function updateTime(event:TimerEvent):void{

   var now:Date = new Date();

   var remainTime:Number = finalDate.getTime() - now.getTime();

   if (remainTime >0) {

      var secs:Number = Math.floor(remainTime/1000);

      var mins:Number = Math.floor(secs/60);

      var hours:Number = Math.floor(mins/60);

      var days:Number = Math.floor(hours/24);

      var secsText:String = (secs%60).toString();

      var minsText:String = (mins%60).toString();

      var hoursText:String = (hours%24).toString();

      var daysText:String = days.toString();

      if (secsText.length < 2) {secsText = "0" + secsText;}

      if (minsText.length < 2) {minsText = "0" + minsText;}

      if (hoursText.length < 2) {hoursText = "0" + hoursText;}

      if (daysText.length < 2) {daysText = "0" + daysText;}

      var time: String = daysText + ":" + hoursText + ":" + minutesText + ":" + secondsText;

    time_txt.text = time;

   }

}

is there a way to debug the AS3 code ?

or can I attach the complete fla code here ? so some can see what I do wrong

or do some one have a finished count down timer i can have a look on ?

best regards

Rene Pedersen