How can I create a count up calendar from designate period with actionscript 3.0???

so i assume you're not using an old version of flash and you're not using actionscript 2.

use:

var count:int = 0;

var current_date:Date=new Date();

var past_date:Date=new Date(2010,6,5);

var daysBetweenDates:Number=(date1.time-date2.time)/(1000*60*60*24);

var t:Timer=new Timer(100,0);

t.addEventListener(TimerEvent.TIMER,countdownF);

t.start();  // execute this line when you want to start the countdown display

function countdownF(e:TimerEvent):void{

tf.text = 'Days since '+formatF(current_date)+' : '+count;

count++;

if(count>daysBetweenDates){

t.stop();

}

}

function formatF(d:Date):String{

var mo:String = (d.month+1).toString();

while(mo.length<2){

mo='0'+mo;

}

var dateS:String = d.date.toString();

while(dateS.length<2){

dateS='0'+dateS;

}

return dateS+'/'+mo+'/'+d.fullYear;

}