CFINPUT DateField

I want to access CFINPUT DateField in my JavaScript, but got page error.

It works if I use text field, but not DateField

<SCRIPT>

function GetLink()

{

  var url = 'MyForm.cfm?StartDate=' + document.MyRequest.dtpEndDate2.Value;

return url;

}

</SCRIPT>

I have above code in my script, it works if the control is a text field, but I got page error when I use DateField,

Please advise how I can read the datefield value,

Your help and information is great appreciated,

Regards,

Iccsi,