Countdown to christmas ActionScripting help

Question

I'm trying to make a countdown clock and was following a tutorial online. Heres the link.
http://www.youtube.com/watch?v=XrTHOUqaS-o&feature=related
Good news! I have the clock working and it is counting down to Sunday like his. But I need it to countdown to christmas and I dont know enough about coding. I tried targetDate but since the coding wasnt setup for it, it didnt work. So any ideas would be great.
stop();
var countdownTimer:Timer = new Timer(1000);
countdownTimer.addEventListener(TimerEvent.TIMER, updateTimer);
countdownTimer.start();
function updateTimer(Event:TimerEvent):void{
    var today:Date = new Date();
    var year = today.getFullYear();
    var dtsBegin:Date = new Date(year, 2, 13);
    var dtsEnd:Date = new Date(year, 10, 6);
    if((today >= dtsBegin) && (today <= dtsEnd)){
        today.minutes -= 240;
    else{
        today.minutes -= 300;
    today.minutes += (today.getTimezoneOffset());
    var sunday = 0;
    var s:int = 59 - today.seconds;
    var m:int = 59 - today.minutes;
    var h:int = 0 - today.hours;
    var d:int = sunday - today.day;
    if(s < 0){
        s += 60;
        m--;
    if(m < 0){
        m += 60;
        h--;
    if(h < 0){
        h += 24;
        d--;
    if(d < 0){
        d += 7;
    var days:String = new String(d);
    var hours:String = new String(h);
    var minutes:String = new String(m);
    var seconds:String = new String(s);
    if(days.length < 2) days = "0" + days;
    if(hours.length < 2) hours = "0" + hours;
    if(minutes.length < 2) minutes = "0" + minutes;
    if(seconds.length < 2) seconds = "0" + seconds;
    var time:String = days + ":" + hours + ":" + minutes + ":" + seconds;
    time_txt.text = time;
    if(s + m + h + d <= 0){
        countdownTimer.stop();
        gotoAndPlay(2);

Answer 1

use:
stop();
var countdownTimer:Timer = new Timer(1000);
countdownTimer.addEventListener(TimerEvent.TIMER, updateTimer);
countdownTimer.start();
function updateTimer(Event:TimerEvent):void{
    var today:Date = new Date();
    var year = today.getFullYear();
    var dtsBegin:Date = new Date(year, 2, 13);
   var dtsEnd:Date = new Date(year, 11, 25);
    if((today >= dtsBegin) && (today <= dtsEnd)){
        today.minutes -= 240;
    else{
        today.minutes -= 300;
    today.minutes += (today.getTimezoneOffset());
    var sunday = 0;
    var s:int = 59 - today.seconds;
    var m:int = 59 - today.minutes;
    var h:int = 0 - today.hours;
    var d:int = sunday - today.day;
    if(s < 0){
        s += 60;
        m--;
    if(m < 0){
        m += 60;
        h--;
    if(h < 0){
        h += 24;
        d--;
    if(d < 0){
        d += 7;
    var days:String = new String(d);
    var hours:String = new String(h);
    var minutes:String = new String(m);
    var seconds:String = new String(s);
    if(days.length < 2) days = "0" + days;
    if(hours.length < 2) hours = "0" + hours;
    if(minutes.length < 2) minutes = "0" + minutes;
    if(seconds.length < 2) seconds = "0" + seconds;
    var time:String = days + ":" + hours + ":" + minutes + ":" + seconds;
    time_txt.text = time;
    if(s + m + h + d <= 0){
        countdownTimer.stop();
        gotoAndPlay(2);