What version of javascript does IE6 and IE7 use

I am trying to calculate the difference between dates in years and months.  I was delighted when I found the functions getFullYear and getFullMonth.  However when I use them I get the following error:  Object doesn't support this property or method.
My research shows that the functions were implemented in javascript 1.3.  Some sites show IE6/7 has using version 1.2 and others 1.3.  Which is it?  Or do I just I have my syntax wrong?  I am using IE7, Visual Studio 2008 and C#.
Thank you.
relevent code:
var BDate =  document.getElementById("txtBirthdate");
            var ODate = document.getElementById("txtOnsetDate");
            var BOD = Date(BDate.valueOf);
                 var years = BOD .getFullYear() - BOD .getFullYear();

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Use "new" to create an object:

var BOD = Date(BDate.valueOf);

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Opps, I said it right, but "copy and paste" it worng... The right should be:

var BOD = new Date(BDate.valueOf);

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RosalindPAuthor Commented:
The actual statement is var BOD = new Date(BDate.value);  The new statement was the key.  Thank you.
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