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<html>
<head>
<title>Date substraction</title>
</head>
<body>
<script language="JavaScript" type="text/javascript">
<!--
var myVar = prompt("Enter a future date: ")
var user_date = Date.parse(myVar);
var today_date = new Date();
var diff_date = user_date - today_date;
document.write(diff_date);
//-->
</script>
</body>
</html>
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