Home Assistant Blueprint to record timestamp of event

mqtt_record_event_timestamp.yaml

blueprint:
  name: Record Event timestamp
  source_url: https://gist.github.com/yuri-vashchenko/ec3ee9c008af7b44071aabdf44b51df5
  description: >
    Publish a message with timestamp to MQTT topic when monitored entity state changes to specifc value or any value
    
    Required inputs:
      - Topic (MQTT root topic)
      - Trigger Entity (entity to monitor state changes)
    
    Optional inputs:
      - Trigger Entity State:
        - if specified the MQTT message will be published only when Trigger Entity state changes to this state
        - if not specified any state change wil generate corresponding MQTT message
      - retain (if set to true, corresponding MQTT message will be retained)
      - Enabling Entity (the automation will execute only when enabling_entity is in Enablign Entity State)
      - Enabling Entity State (see Enabling Entity above)

  domain: automation
  input:
    topic:
      name: Topic (path) of the MQTT topic
      description: The full topic will be '<topic>/<trigger_entity_name>/<trigger_entity_state>'
      selector:
        entity:
          domain: input_text
    trigger_entity:
      name: Trigger Entity
      description: When trigger entity enters trigger entity state (see below) the corresponding MQTT message will be published
      selector:
        entity:
          domain: binary_sensor
          device_class: motion
    trigger_entity_state:
      name: (Optional) Trigger Entity State
      description: When trigger entity's (see above) state changes to Trigger Entity State the corresponding MQTT message will be published
      default:
      selector:
        entity:
          domain: input_text
    retain:
      name: (Optional) retain
      description: Set this to 'true' if you want MQTT message to be retained
      default: true
      selector:
        entity:
          domain: input_boolean
    enabling_entity:
      name: (Optional) Enabling entity
      description: If this entity's state is set to enable entity state (see below) automation will trigger.
        This may be used to make automation triggering based on other entity state
      default:
      selector:
        entity: {}
    enabling_entity_state:
      name: (Optional) Enabling entity state 
      description: If enabling entity is in this state the automation will trigger
      default: 'on'
      selector:
        entity:
          domain: input_text

variables:
  trigger_entity: !input 'trigger_entity'
  trigger_entity_state: !input 'trigger_entity_state'
  trigger_entity_state_value: '{{ states[trigger_entity].state }}'
  trigger_entity_name: '{{ states[trigger_entity].entity_id.split(''.'')[1] }}'
  topic: !input 'topic'
  enabling_entity: !input 'enabling_entity'
  enabling_entity_state: !input 'enabling_entity_state'

trigger:
  - platform: state
    entity_id: !input trigger_entity

condition:
  - condition: template
    value_template: '{{ trigger_entity_state == none or is_state(trigger_entity, trigger_entity_state) }}'
  - condition: template
    value_template: '{{ trigger_entity_state_value != none and trigger_entity_state_value != "" }}'
  - condition: template
    value_template: '{{ enabling_entity == none or is_state(enabling_entity, enabling_entity_state) }}'

action:
  - service: mqtt.publish
    data_template:
      topic: '{{ topic }}/{{ trigger_entity_name }}/{{ trigger_entity_state_value }}'
      payload: "{{ now() }}"
      retain: !input retain

mode: parallel
max: 50
max_exceeded: warning