I’ve created this simple countdown timer tile. Here’s the link to the HTML for you to paste into custom tile editor.
Enter the Target date in this format:
Jan 1, 2022 15:00:00
or just
Jan 1, 2022
You can configure it in the tile editor like these examples.
Tile dimensions and styles can be applied normally from the tile editor
Any way to use this with SmartThings?
Yep, it doesn’t use any hub connection. Just runs in the sharptools browser. Give it a shot and comment back if I need to tweak anything.
Nice work! Don’t forget that you can use the special import URL format to make it easier to import your custom code! 
In your case, it would be :
https://sharptools.io/developer/custom-tiles/import/?url=https%3A%2F%2Fraw.githubusercontent.com%2Fkampto%2FSharpTools%2Fmain%2FCustomTiles%2FCountDownTimer.html
Here’s a quick import button for you. 
