First of all, dates are always stored the same way. Here's a link that explains the DateTime field a little better. http://support.microsoft.com/default.aspx/kb/q130514/
Having said that, you can display the DateTime field any way you wish with the Format() function. Format([YourDateField],"mm/dd/yy")
RuralGuy's advice about using Format is spot on; it allows a great deal of handy manipulation for dates/times, but I'm confused! A Date field defined in a table as a Short Date is not (XX/XX/XXXX) but rather (XX/XX/XX) which is what you stated you wanted! What kind of difficulty are you having?
Negative on that missinglinq. The date is actually stored in the table as a double (number) and Short Date is the formatting that is defined in regional settings on your computer. You can define it to be whatever you want (provided it returns a valid date format). The default shortdate format for Windows is now X/X/XXXX.