Sensor since last changed using relative time?

Configuration
4

@lolouk44

here is my config. By “sensible” i mean minutes when its minutes, hours when its hours etc - this seems to be done internally in relative_time hence using it:

  - platform: template
    sensors:
      car_last_updated:
        friendly_name: 'Car Last Seen'
        icon_template: mdi:clock-outline
        value_template: "{{relative_time(states.device_tracker.bc_30_7e_53_cc_66.last_changed)}}"
        entity_id: sensor.date_time

@DavidFW1960 - i already have it showing as “6 seconds” - trying your suggestion leads to “invalid date/time” when adding to above config