Tracking On and Off Times for Devices

Hello! I am trying to set up a sensor or something of that sort that will show the time a device/entity turned off and on. I have found some help and it worked for a little bit but I am not sure why everything is not working. Basically, I have setup a dashboard for my fish tanks. I want to see what time the device turned off and what time it turned on.

This is what I have in my sensors.yaml

- platform: history_stats
  name: Blackwater Air Pump On
  entity_id: switch.blackwater_air_pump
  state: 'on'
  type: time
  end: "{{ now().replace(hour=0, minute=0, second=0) }}"
  duration:
    hours: 24
- platform: history_stats
  name: Blackwater Air Pump Off
  entity_id: switch.blackwater_air_pump
  state: 'off'
  type: time
  end: "{{ now().replace(hour=0, minute=0, second=0) }}"
  duration:
    hours: 24

This is what I had in my templates.yaml (not sure where this should actually go)

- trigger:
   - platform: state
     entity_id: switch.blackwater_air_pump
     to: 'on'
   - sensor:
     - name: Blackwater Air Pump On
       state: "{{ now().timestamp() | timestamp_custom('%I:%M %p %a') }} "
- trigger:
   - platform: state
     entity_id: switch.blackwater_air_pump
     to: 'off'
   - sensor:
     - name: Blackwater Air Pump Off
       state: "{{ now().timestamp() | timestamp_custom('%I:%M %p %a') }} "

Full disclosure I am not very good at this coding business. I have come really far but still this stuff gets me lost. Any help appreciated or if there is a less bulky way that would also be great! thanks!

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