Time Is Not Real Until the Lamp Goes Red

The problem

Time blindness. 'Leaving in 30 minutes' and 'leaving right now' feel identical until you're already late.

What it does

A hallway lamp becomes a glanceable countdown to your leave time: green while you've got room, amber at 15 minutes, red and pulsing at 5. A sense of time you can see from across the room.

alias: "Angry Dad — Time-To-Leave Lamp"
description: Turns a lamp into a glanceable countdown so time stops being invisible.
mode: single
triggers:
  - trigger: time_pattern
    minutes: "/1"
conditions:
  - condition: state
    entity_id: input_boolean.leaving_cue
    state: "on"
actions:
  - variables:
      mins_left: >
        {{ ((as_timestamp(today_at(states('input_datetime.leave_time')))
            - as_timestamp(now())) / 60) | int }}
  - choose:
      - conditions: "{{ mins_left > 15 }}"
        sequence:
          - action: light.turn_on
            target: { entity_id: light.hall_lamp }
            data: { rgb_color: [0, 200, 60], brightness_pct: 50 }
      - conditions: "{{ mins_left <= 15 and mins_left > 5 }}"
        sequence:
          - action: light.turn_on
            target: { entity_id: light.hall_lamp }
            data: { rgb_color: [255, 170, 0], brightness_pct: 70 }
      - conditions: "{{ mins_left <= 5 and mins_left >= 0 }}"
        sequence:
          - action: light.turn_on
            target: { entity_id: light.hall_lamp }
            data: { rgb_color: [255, 0, 0], brightness_pct: 100, flash: short }
    default:
      - action: light.turn_off
        target: { entity_id: light.hall_lamp }

Drop this into an automation (or a package under config/packages/) and swap the entity IDs for your own.