Time offset before or after timestamp type entity?

Configuration
1

I have a timestamp type entity that displays itself as HH:MM[:SS]. I wish to have one action performed 2 hours before the time and one action 10 minutes after the time.

I have searched both this forum and the Internet as well but cannot seem to find any solution [without helper(s), blueprint(s) and/or configuration item(s)] for this.

So my question is: what do I need to modify to accomplish

triggers:
  - trigger: time
    at: >-
      {{ as_timestamp
      (as_datetime(states("sensor.my_next_alarm"))+timedelta(minutes=10)) }}

?

The above should launch action(s) at 10 minutes after sensor.my_next_alarm time. I know the sensor.my_next_alarm to be working as I can trigger action(s) against it directly.

2

Templates are not supported in Time triggers like that:

Time Trigger docs

- alias: Trigger 2 hours before my next alarm
  trigger: time
  at:
    entity_id: sensor.my_next_alarm
    offset: "-02:00:00"

For the positive offset, you will likely be better off triggering on the sensor then starting a timer or using a wait action. Another option would be to trigger on the sensor and set an Input Datetime to the desired time, then use that in your trigger.

3

Thanks for the heads up!

I love the solution of triggering Input Datetime to the desired time and using it.

For my needs I will use the offset of -2hrs for before and Wait for 10 mins after.