Triggering an automation at a variable offset to sunrise/sunset

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Not much of a project but hopefully it’ll help others facing the same problem: I’ve got some automations I want to trigger at a certain time before sunset vaguely defined as “before the night insects start flying”, which changes by season. I thought it’d be easy enough to do, just vary the offset from sunset:

template:
  - sensor:
      - name: "Time Offset Summer/Winter"
        unique_id: uniqueid__time_offset_summer_winter
        state: "{{ {'spring': '-01:30:00', 'summer': '-01:30:00', 'autumn': '-01:00:00', 'winter': '-01:00:00'}.get(states('sensor.season'), 'summer') }}"

triggers:
  - trigger: sun
    event: sunset
    offset: "{{ states('sensor.time_offset_summer_winter') }}"

However this doesn’t work because the sun offset field doesn’t accept templates.

To make this work, you need to perform the required calculation inside the template sensor:

template:
  - sensor:
      - name: "Sunset With Seasonal Offset"
        unique_id: uniqueid__sunset_with_seasonal_offset
        device_class: timestamp
        state: >
          {% set offsets = {'spring': 90, 'summer': 120, 'autumn': 90, 'winter': 60} %}
          {% set mins = offsets.get(states('sensor.season'), 120) %}
          {{ state_attr('sun.sun', 'next_setting') | as_datetime - timedelta(minutes=mins) }}

and then trigger on the resulting time value:

triggers:
  - trigger: time
    at: sensor.sunset_with_seasonal_offset
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