Umm,
In International (System Preferences) I do have this Drop down
http://img.skitch.com/20101202-dsa6qhux12u5gcqdjh9mkrn1xg.png
My Custom Option is not available so nothing I set in the Custom Button works.
(these are the things I remember trying to use before to make the clock change).
I am the Admin account so I don't know why I can't change this to Custom
If I Click the menu bar clock I do see the day in Full (But greyed out) where as the clock displays a shortened version of the day.
I followed you link and tried the settings they used.
Turning Off the Show Day option only removed the short version.
In fact changing it to Not show the 24 Hour clock showed 07 as the Hours with no PM indicator (and that option was greyed out even when I went back and added PM to the Custom option - which was Live after Adding the Date to the Time settings)
I will try a PRAM reset once I have caught up with Subscription emails
7:37 PM Thursday; December 2, 2010
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