As an avid racing cyclist, pitting yourself against the clock is nothing unusual in a time trial.
So what better way to portray time than with a cyclist.
This project is an animated cyclist representing the passage of time with the cycle wheels. The rear wheel shows the hours and the front wheel shows the minutes.
This will be accomplished using a combination of 3d printing and manual machining.
The microcontroller, RTC, servos and build details can be found on Instructables.
https://www.instructables.com/Against-the-Clock-Revisited/
Technical
PLA filment in multiple colours
No supports required
LEGO cogs
LEGO axles
Nuts and Bolts
Bearings
Perspex
Discrete electronics componenets.
Build details are in the Instructable.