URGENT: How do you get the Day value of a Date Field?

How do you get the Day value of a Date Field with Server Side Javascript?

var DateField=currentDocument.getItemValueDate(“ApprovedDate”);

None of the Code below works:

var DayVal=@Day(@Date(DateField));

or

Var DateVal=new Date(DateField));

Var DayVal=DateVal.getDay();

Subject: @Day ?

Subject: How Do you get the Day Value?

Do anybody know how to get the Day value of an Date Field?