If I have many DateTime entities who can trigger an Automation, I would like to know which one triggerred the automation.
I would need : {{ trigger.entity_id }}
If I have many DateTime entities who can trigger an Automation, I would like to know which one triggerred the automation.
I would need : {{ trigger.entity_id }}
It already exists in version 0.117.
Here are two input_datetime entities:

Here is an automation that is triggered by either of the two entities. It reports which entity triggered the automation:
- alias: 'Example A1'
trigger:
- platform: time
at:
- input_datetime.test
- input_datetime.test2
action:
- service: persistent_notification.create
data:
title: '{{ now().timestamp() | timestamp_local() }}'
message: 'Triggered by: {{ trigger.entity_id }}'
Here are the notifications produced by the automation:

I tested it yesterday on 117.6 and it didnt work???
I tested it in 0.117.5 and it works. Maybe there was a regression error in 0.117.6 and it no longer works? 
I retest it, and it work…! OK thanks mate !
Here’s the Pull Request:
It was included in 0.117. Here’s a screenshot from the release notes:

If you are satisfied it works correctly, please mark my first post (above) with the Solution tag to formally close this topic. Thank you.