Counting seconds binary sensor is on in 24 hour period

ESPHome
4

First pass below. Compiles but in no way tested.

globals:
  # used to store timestamp for sensor on
  - id: timestamp
    type: int

time:
  - platform: sntp
    id: sntp_time
    # at midnight:
    on_time:
      - seconds: 0
        minutes: 0
        hours: 0
        then:
          # reset daily time counter
          - sensor.template.publish:
              id: run_time
              state: !lambda 'return 0;'

binary_sensor:
  # input binary sensor we want to calculate total on-time for
  - platform: gpio
    name: "Input Sensor"
    id: input_sensor
    pin:
      number: GPIO26
      mode:
        input: true
        pullup: true
    on_press: 
      # store the current epoch time (seconds since 1/1/70)
      - lambda: 'id(timestamp) = id(sntp_time).now().timestamp;'
    on_release:
      # calculate the total time = (old total time) + (current epoch time) - (stored on_press epoch time)
      # and publish in the template sensor
      - sensor.template.publish:
          id: run_time
          state: !lambda 'return id(run_time).state + id(sntp_time).now().timestamp - id(timestamp);'

sensor:
  # total run time for the day sensor
  - platform: template
    name: "Run Time"
    id: run_time