To get what you're asking, I think you could have a second question of type calculate
and use the format-date(date,format)
function.
+===========+=============+=======+====================================+
| type | name | label | calculation |
+===========+=============+=======+====================================+
| date | my_date | Date: | |
+-----------+-------------+-------+------------------------------------+
| calculate | format_date | | format-date(${my_date},'%d-%m-%y') |
+-----------+-------------+-------+------------------------------------+
And this feature will hopefully help when it is released: