Display entities in a row with separator

When posting YAML, please be sure to follow the formatting guidance in this post. You should also consider using the new format for template sensor config instead of the retired legacy format.

You can mix templates with dynamic content (inside the curly brackets) with static content (outside), like so:

template:
  - sensor:
    - name: Date Magnum Heating
      state: >
        {{states(‘sensor.magnum_day’)}}-{{states(‘sensor.magnum_month’)}}-{{states(‘sensor.magnum_year’)}}
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