I use The Clock both as an engineer working with teams across multiple time zones, and as an amateur radio operator. In ham radio we record many events by UTC as 24-hour display, and The Clock makes it extremely easy to setup a mixed timezone display with some timezone clocks as normal 12-hour AM/PM, and “zulu time” as 24-hour. It’s pretty hard to find a clock app that will actually do that in the first place. On top of that, it’s the best looking clock/calendar I’ve found on any platform. Just fantastic.