Export sensor data to text file

Configuration
9

thanks.

How would you add a time stamp?

EDIT, found

notify:
  - platform: file
    name: filenotify
    filename: /share/history/10sec_power_reading.csv
    #timestamp: true

automation:
  - alias: sensor_values_to_file
    initial_state: 'on'
    trigger:
      - platform: time
        seconds: 10
    action:
      - service: notify.filenotify
        data_template: 
          message: '{{ states.sensor.efergy_802171.state }}; {{now().strftime("%Y%m%d-%H%M%S")}}'
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