Formatting template sensors with trigger

[dragon1 (D)]

I feel like an idiot for having to ask this, but can someone help me with how to format a template sensor with trigger in a template.yaml file? Before I try to get started with the sensor I really want, I experimented with the example from Template - Home Assistant.

I tried updating it, based on Adding trigger based template to a templates.yaml file? - #4 by Scott8586

I also tried copying in a random example from Automation Trigger - battery_level for a device - #2 by 123

Can someone help me with formatting my code or sharing one of your own examples of a template trigger that works in template.yaml? Seeing a working example would really help me with understanding the logic.

- trigger:
    - trigger: time_pattern
      # This will update every night
      hours: 0
      minutes: 0
    sensor:
    # Keep track how many days have past since a date
    - name: "Not smoking"
      state: '{{ ( ( as_timestamp(now()) - as_timestamp(strptime("06.07.2018", "%d.%m.%Y")) ) / 86400 ) | round(default=0) }}'
      unit_of_measurement: "Days"

[tom_l]

- trigger:
    - trigger: time_pattern
      hours: 0
      minutes: 0
  sensor: ### no dash in front of this ###
    - name: "Not smoking"
      state: '{{ ( ( as_timestamp(now()) - as_timestamp(strptime("06.07.2018", "%d.%m.%Y")) ) / 86400 ) | round(default=0) }}'
      unit_of_measurement: "Days"

No dash in front of “sensor”, just like the example in the documentation: https://www.home-assistant.io/integrations/template/#trigger-based-template-binary-sensors-buttons-images-numbers-selects-and-sensors

[dragon1 (D)]

Hi Tom!

I made a mistake with coping the code in my post, apologies. I have edited my original post so the code is the same as the screenshot.
As you can see in the screenshot, removing the dash does not solve the issue.