Where does DateFormat.ShortDatePattern and 'Regional Settings/Date tab'

[Phil]

My regional setting (on Win2000) is:
(General Tab)Locale = English (US)
(Date Tab), short date = MM/dd/yy

When I ask .Net DateFormat.ShortDatePattern,
I get MM/dd/yyyy

Now, where does the yyyy part come from? It looks as if
DateFormat does not look in the overriden format on the
Date tab and just assumes that English(US) is fixed to MM/dd/yyyy...
Is there a function that does return the (imho) correct MM/dd/yy format?