Date Device Class - Relative Display

Feature Requests
1

The ability to classify a date device class sensor entity for relative time formatting in the front end similar to how is possible for the timestamp device class would be useful for sensors that provide a date instead of a timestamp.

Currently I’ve have to create a few template sensors to convert entities with a date device class into timestamps to achieve a relative time display in the UI.

- sensor:
    - name: 'Nest Protect Downstairs Replace'
      unique_id: nest_protect_downstairs_replace
      icon: mdi:calendar-account-outline
      device_class: timestamp
      state: >
        {% set time = states('sensor.nest_protect_downstairs_replace_by') %}
        {% if time != none and is_state('input_boolean.startup_pending','off') %}
          {{ time|as_datetime|as_local }}
        {% else %} {{ none }}
        {% endif %}

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This would resolve issues such as this one.