This is a FREE Modern Countdown / Timer Template for DaVinci Resolve 18.5 and up because it uses the new Multimerge node. With this template you can switch between a countdown timer and a regular timer by enabling a checkbox. The template also looks different from the one that I made in the video (you can watch it on the link below).
Put the unzipped .settings file to C:\Users\Your PC Name\AppData\Roaming\Blackmagic Design\DaVinci Resolve\Support\Fusion\Templates\Edit\Generators
Video on how the no keyframe animation timer was made https://youtu.be/yodAte9rbbY