The available formats would be M/D/YY, M/D/YYYY, MM/DD/YY or MM/DD/YYYY and others as below
If you want to display the date in "DD/MM/YYYY" Format, you would have to choose custom date format and give DD/MM/YYYY. This format would be displayed if field is Read-only. If you want to see this format while the field is editable you have to enable " Display value using read-only formatting".
At run time , after the date is selected when you tab out that field it will display the date in the mentioned format.