Date / time format in dashboard

I have an automation that set the date and time of an helper entity.
That is working fine.

The value of the helper is for example: 14 december 2022 om 21:45

But I want to show that value in a card like 14/12/22 21:45

How can I change the format of date and time for the card?

This has always been my goto for time manipulation: