period_of_day template_sensor

template:
  - sensor:
      - unique_id: period_of_day
        name: Period of the day
        state: >
          {% if (as_timestamp(state_attr('sun.sun','next_dusk'))) -
                (as_timestamp(state_attr('sun.sun','next_setting'))) < 0 %}
            Dusk
          {% elif (as_timestamp(state_attr('sun.sun','next_rising'))) -
                  (as_timestamp(state_attr('sun.sun','next_dawn'))) < 0 %}
            Dawn
          {% elif now().hour == 0 %}
            Midnight
          {% elif (state_attr('sun.sun', 'elevation')) < 0 %}
            Night
          {% else %}
            Day
          {% endif %}
        icon: >
          {% set period = states('sensor.period_of_day') %}
          {% if period == 'Dusk' %} mdi:weather-sunset-down
          {% elif period == 'Dawn' %} mdi:weather-sunset-up
          {% elif period == 'Night' %}  mdi:weather-night
          {% elif period == 'Midnight' %} mdi:clock-time-twelve
          {% else %} mdi:weather-sunny
          {% endif %}