If you have mushroom cards installed, you can create a mushroom template card and add the code below
type: custom:mushroom-template-card
primary: >-
{% set danishWeekdays = ["MANDAG",
"TIRSDAG","ONSDAG","TORSDAG","FREDAG","LØRDAG","SØNDAG"] %}
{{ danishWeekdays[now().weekday()] }}
secondary: '{{ now().strftime(''%d/%m/%Y'') }}'
multiline_secondary: false