Calendar

The calendar integration allows you to integrate your calendars into Home Assistant. Calendars are shown on the calendar dashboard, and can be used with automations.

A calendar entity has state and attributes represent the next upcoming event (only). A calendar trigger is much more flexible, has fewer limitations, and is recommended for automations, instead of using the entity state.

Automation

Calendar Triggers enable automation based on an event start or end. Review the Automating Home Assistant getting started guide on automations or the Automation documentation for full details.

An example of a calendar trigger in yaml:

automation:
  trigger:
    - platform: calendar
      # Possible values: start, end
      event: start
      # The calendar entity_id
      entity_id: calendar.personal
      # Optional time offset to fire a set time before or after event start/end
      offset: -00:15:00

Calendar triggers should should generally not use automation mode single to ensure the trigger can fire when multiple events start at the same time (e.g., use queued or parallel instead). Note that calendars are read once every 15 minutes. When testing, make sure you do not plan events less than 15 minutes away from the current time, or your trigger might not fire.

See Automation Trigger Variables: Calendar for additional trigger data available for conditions or actions.

Automation Recipes

Below are a few example ways you can use Calendar triggers.

automation:
  alias: Calendar notification
  trigger:
    - platform: calendar
      event: start
      entity_id: calendar.personal
  action:
    - service: persistent_notification.create
      data:
        message: >-
          Event {{ trigger.calendar_event.summary }} @
          {{ trigger.calendar_event.start }}
  mode: queued

automation:
  alias: Front Light Schedule
  trigger:
    - platform: calendar
      event: start
      entity_id: calendar.device_automation
    - platform: calendar
      event: end
      entity_id: calendar.device_automation
  condition:
    - condition: template
      value_template: "{{ 'Front Lights' in trigger.calendar_event.summary }}"
  action:
    - if:
        - "{{ trigger.event == 'start' }}"
      then:
        - service: light.turn_on
          entity_id: light.front
      else:
        - service: light.turn_off
          entity_id: light.front
  mode: queued