How to show last change time

Hi,

I would like to show time (date) when last change on a person status.
Now only see the hours a person is home or left home.

1000035876

But i would like to see the exact time and date on the dashboard.

      - type: custom:mushroom-person-card
        entity: person.csfolmer
        name: Kees 
        secondary_info: last-changed
     - type: custom:mushroom-person-card
        entity: device_tracker.linda_samsung
        name: Linda
        fill_container: false
        secondary_info: last-updated

Can only chose “last-changed” of “last-updated” but it give not the exact date and time.

someone got a idea?