Pass date and time to automation

Configuration
1

Hi,

I’m new to HA and been setting up some automations and my latest challenge is to set my alarm using HA.

My idea is to have a dimmable switch that will gradually increase and that part is easy. The hard part is to create a calendar event to start at the desired time.

I’ve created a date and time helper and a button helper to trigger an automation that should create an entry in my calendar. The problem is that I’m not finding a way to pass my datetime helper into the calendar.

Below my YAML for the automation and would appreciate some help on how I can get it to work. End date is fixed for testing purposes, and when I manage to pass the start date and time, I’ll focus on getting 1 second added to my end time (will be another question :wink:)

alias: 022-Set Alarm at specific time
description: ""
trigger:
  - platform: state
    entity_id:
      - input_button.set_alarm_button
condition: []
action:
  - service: calendar.create_event
    data:
      summary: Alarm
      start_date_time: input_datetime.alarm_date_and_time
      end_date_time: "2023-10-19 06:00:01"
    target:
      entity_id: calendar.automations
mode: single

What am I doing wrong? Been reading the documentation and checking other examples, but not getting it.

Thanks

2 
start_date_time: "{{ states('input_datetime.alarm_date_and_time') }}"

Reference

Templating - States

3

Thanks, that worked.

My second question, any way to add 1 second to my input, so I cam use as end_date_time?

4

If you want to start dimming a light at a specific time, why not simply use a Time Trigger? It supports an Input Datetime directly.

trigger:
  - platform: time
    at: input_datetime.alarm_date_and_time
5

That would work to setup a single alarm, but my plan is to set multiple alarms throughout the week and they can be at different times. For example, on Sunday I set all alarms for coming week.

6

Got it fixed with

{{(((state_attr('input_datetime.alarm_date_and_time' , 'timestamp')) + 60) | timestamp_custom('%Y-%m-%d %H:%M:%S', true))}}