An example of a countdown timer, and some related questions

[tboyce1 (Trevor)]

Slightly related, I made a stopwatch that counts up instead of down before seeing this post:

Action when laundry is done

Check this out input_boolean: stopwatch: name: Stopwatch initial: off dummy: name: Dummy initial: off automation: - alias: Stopwatch start trigger: platform: state entity_id: input_boolean.stopwatch state: "on" action: - service: input_boolean.toggle entity_id: input_boolean.dummy - alias: Stopwatch stop trigger: platform: state entity_id: input_boolean.stopwatch state: 'off' action: …

I agree that this would probably be easier and more flexible using an app to save off time values and manipulate them though.