configuration.yaml

sensor:
  - platform: template
    sensors:
      car_fully_charged_time:
        value_template: >-
          {% if is_state('switch.sxxxxxxxxxxxxxxx', 'on') %}
            {% set charging_time_left_str = states('sensor.xxxxxxxxxxxxxxx_charging_time_left') %}
            {% set charging_time_left = charging_time_left_str.split(',')[0] | int(default=0) %}
            {% set last_connected_time_str = states('sensor.xxxxxxxxxxxxxxx_last_connected') %}
      
            {% if last_connected_time_str %}
              {% set last_connected_time = as_timestamp(strptime(last_connected_time_str, '%Y-%m-%dT%H:%M:%S%z')) | int %}
            {% else %}
              {% set last_connected_time = now().timestamp() %}
            {% endif %}

            {% if charging_time_left != 0 %}
              {% set fully_charged_time_seconds = last_connected_time + charging_time_left * 60 + 3600 %}
              {% set fully_charged_time_seconds_with_extra_hour = fully_charged_time_seconds + 3600 %}
              {% set hours = ((fully_charged_time_seconds_with_extra_hour % 86400) // 3600) %}
              {% set minutes = ((fully_charged_time_seconds_with_extra_hour % 86400) % 3600) // 60 %}
              Car will be fully charged at: {{ "%02d:%02d" | format(hours, minutes) }} 
            {% else %}
              Data not available  
            {% endif %}
          {% else %}
            Not charging
          {% endif %}
    
        friendly_name: 'Car Fully Charged Time'
        icon_template: mdi:car-electric