How do I use this?
Use your countdown as your web browser's home page on your computer or mobile device. You'll see it every day.
How morbid! Why would I want this?
You can't ever buy more time. Not with your family, or your friends, or your good health, or your mental faculties. You need to do the things that are important to you now, before old age or an early death make them impossible.
This is how you remind yourself to do something worthwhile every day.