time_to_event

sensor:
  - platform: template
    sensors:
      time_to_event:
        value_template: >
          {%- if state_attr('calendar.familijne', 'start_time') == None -%}
            Brak wydarzeń
          {%- else -%}
            {%- set t = ((state_attr('calendar.familijne', 'start_time') | as_timestamp - now() | as_timestamp)/3600) | int  -%}
            {{ (t/24) | round(method='floor') }} dni, {{ t % 24}} godzin
          {%- endif -%}