Still want to improve this. But here it is.
This automation checks if garbage is due to be picked up X days from today and if so, it sends a notification to your phone.
Main thing to be improved: Right now the automation always fires on midnight / whenever the trigger entity (countdown entity) reaches the required value. Given that we’re looking at days, this mostly will be midnight of day X to day Y. So ideally I will add a number input so that we can put in an offset between that “jump”-time and when we want to have this fire. For example: If we want the automation to fire at 7 in the morning, I would add a wait condition of 7 hours …