Finding the end date for the active Sprint

I am defining the following calculated member for finding the end date for current active sprint across all the boards in my project :

Aggregate(
Order(
Filter(
[Sprint].[Sprint].Members,
NOT [Sprint].CurrentMember.getBoolean(‘Closed’)
),

– Filtering the Active sprint on the board
[Sprint].CurrentHierarchyMember.get(‘End date’)
))

I am selecting the formatting as mm dd yyyy . However i’m not getting any date in the result rather i’m getting the text “mm dd yyyy”