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var d=Date("21/12/2009");

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thank u , It is the answer
if(date_1!=null && date_1!="" )
  {
  alert("2");
  var date1_day=date_1.substring(0,2);
  var date1_mon=date_1.substring(3,5);
  var date1_year=date_1.substring(6,10);

  var  date1=  new  Date(parseInt(date1_year,10),parseInt(date1_mon,10)-1,parseInt(date1_day,10)); 
  alert("new");
alert(date1);}
else
    date1="";

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JScript code:

<html>
<head>
<script type="text/javascript">
window.onload=function(){
var a = document.getElementsByTagName("a");
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