How do I store my phone's next alarm time into a date/time helper?

Configuration Frontend
1

Hello.
I am trying to save the date and time of my next alarm from my Android phone’s sensor.myphone_next_alarm to a date/time helper input_datetime.wake_up_time within an automation. If I try to set the date/time helper using the UI, there is no option (that I can see) to set it to the value of another entity, which is what I am trying to do. How can I do this in YAML?
Thanks

2

You can do this in the UI but you need to write in a template for the datetime that you want to set your input helper to. If you use an entity state trigger, you can set the action to this date & time so that you don’t have to refer to the sensor entity_id in two different locations:
{{ trigger.to_state.state | as_datetime | as_local }}

If you use some other trigger, then you’d need to call out the sensor name:
{{ states('sensor.myphone_next_alarm') | as_datetime | as_local }}

Note that in both cases I didn’t perform any error handling, with the assumption that you’d only trigger when the state of the next alarm got updated to a real value and not to unavailable or unknown. You can do that by restricting the trigger states.

The entire automation would be this:

alias: datetime automation
description: ""
triggers:
  - trigger: state
    entity_id:
      - sensor.myphone_next_alarm
    not_to:
      - unavailable
      - unknown
conditions: []
actions:
  - action: input_datetime.set_datetime
    data:
      datetime: "{{ trigger.to_state.state | as_datetime | as_local }}"
    target:
      entity_id: input_datetime.wake_up_time
mode: single
3

This worked like a charm, thank you!

I had tried a version of

but I was unable to get the right syntax.

Triggering upon state change was going to be my next question, so thanks for that as well!

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