Hey Long, thanks for your fast reply!
But that doesn't change my initial problem!
My Date Value as saved as Y-m-d in the Database.
The display for the date is saved as d.m.Y.
In the Admin Columns the Date is shown as Y-m-d (Database Format).
But i want to display the date in the admin columns as the display date (d.m.Y)! Without changing the database formatting.
I guess this isn't possible?