Hi @cburtenshaw
I made a version that is fully customizable in terms of the format you want to display. The raised event "dateSelected" on the master when you place it on a page or another master can be called to do what you ask.
You would simply change my default:
Set text on Your library item to [[dateSelected.getMonthName()]] [[dateSelected.getDate()]] [[dateSelected.getFullYear()]]
To...
Set text on Your library item to [[dateSelected.getMonthName()]] [[dateSelected.getDate()]] [[dateSelected.getFullYear().substring(2,4)]]