Using last_changed in a widget

Third party integrations HADashboard
1

According to Last_updated (or last_changed) as sub_entity, I should be able to use last_changed in a widget, but with AppDaemon 4.0.5, that doesn’t appear to be working.

The following widget will show a subentity:

dryer_widget:
    widget_type: sensor
    title: "Dryer Status"
    entity: input_select.dryer_status
    entity_to_sub_entity_attribute: friendly_name

This widget, however, won’t show a subentry:

dryer_widget_last_changed:
    widget_type: sensor
    title: "Dryer Status"
    entity: input_select.dryer_status
    entity_to_sub_entity_attribute: last_changed

Is it because last_changed isn’t an official attribute of the sensor, but something that Home Assistant creates itself, it appears? Or am I missing something?

2

last_changed is generated from HA in most cases.
I have yet to figure it completely out but sometimes it is last-changed.

3

For anyone else: you can’t access last_changed from HADashboard at the moment. I got around this by creating a template sensor that HADashboard can look at:

  - platform: template
    sensors:
      washing_machine_last_changed:
        value_template: '{{ relative_time(states.sensor.washing_machine_status.last_changed) }}'
        friendly_name: 'Washing Machine Status Last Changed'

and

washing_machine_widget:
    widget_type: sensor
    title: "Washing Machine"
    entity: input_select.washing_machine_status
    sub_entity: sensor.washing_machine_last_changed