The DateLastModified property returns the date when the file was last modified.
<html>
<BODY>
<script language="JScript">
<!--
function get()
{
var myObject, f, date;
myObject = new ActiveXObject("Scripting.FileSystemObject");
f = myObject.GetFile("c:\\test.txt");
date = f.DateLastModified;
alert ("The date this file was last modified is: " + date);
}
//-->
</script>
Get the date that mytest.txt was last modified.
<form name="myForm">
<INPUT type="Button" value="Get Date" onClick='get()'>
</form>
</BODY>
</html>