The U.S. military uses 24-hour military time to avoid confusion between a.m. and p.m. The Navy started using it in 1920, and the Army adopted it in 1942.

Much like that one, the triple time zone clock is controlled by a single Wemos D1 mini, and the other two panels are chained to the primary board.

Turns out, there are 24 time zones across the globe, spanning different regions and cultures. It's fascinating to think that when New Yorkers are getting ready to start their day, people in Tokyo ...

The onscreen action (or non-action) is synced up to the actual time, so if you see a shot onscreen of a clock tower showing 4:45 p.m., you know it's 4:45 p.m. in Minneapolis.

Each time zone would cover 15 degrees of longitude (1/24 of the planet), and would differ from the neighboring zone by one hour.

Review Article Published: September 2001 Time zones: a comparative genetics of circadian clocks Michael W. Young & Steve A. Kay Nature Reviews Genetics 2, 702–715 (2001) Cite this article ...