calcul_datetime.yaml

- alias: "[System] - Heure Reveil"
    trigger:
      platform: time
      at: input_datetime.heure_reveil_avant_A
    action:
      - service: hommeassistant.toggle
        data:
          entity_id: switch.monchauffage
          
- alias: "[System] - Modification de l'input_datetime heure_reveil_avant_A"
    trigger:
      - platform: state
        entity_id: input_datetime.heure_reveil_A
    action:
      - service: input_datetime.set_datetime
        entity_id: input_datetime.heure_reveil_avant_A
        data:
          timestamp: "{{ ( as_timestamp(states('input_datetime.heure_reveil_A')) - ( ( states('input_number.duree_min') | int ) * 60 ) ) }}"
          
input_number:
  duree_min:
    name: "Durée (minutes)"
    min: 1.0
    max: 60.0
    step: 1
    initial: 20
    unit_of_measurement: min
    mode: slider

input_datetime:
  heure_reveil_A:
    name: Reveil A
    has_time: true
    has_date: true
 
  heure_reveil_avant_A:
    name: Reveil avant A
    has_time: true
    has_date: true