My favorite retirement gift is a seven segment clock that points to the day of the week. It usually gets a laugh, followed up months later with an honest thank you and an anecdote about how it saved them from going to the bank on a Sunday or the like.

https://dayclocks.com/

Nice. Related, I also love exploring different ways to visualize time, so a few months back I came up with twelve variations arranged in the form of an actual clock that you can click through to see each one.

Each one presents a different type of visualization (from sand, where each falling grain represents a second to a 3D-modeled set of water wheels)

https://clocks.specr.net

That's pretty neat. The ? (help) link and the speed up button overlap on my browser (firefox on android, url bar on the bottom). My email is in my profile, I can send a screenshot if you need it.

Tip Clock is the best one yet.

very cool thanks for sharing.

I'm curious, are there any other notable time measurement systems other than the ones listed here?

Swatch Internet Time was almost kind of a thing in the late 90s.

Im surprised not to find a radians-based clock among these.

No centons?