La Crosse Technology WS-6003U-A Atomic Digital Wall Clock

I needed a clock that would display UTC/GMT in 24 hour mode. Somehow, I thought this clock would do it, as many atomic clocks are limited to US time zones. In fact, it will do the UTC/GMT time, and will allow you to set it for 24-hour display mode. Unfortunately, it cannot display a "2" in the first digit of the hour display. So, from 2000 until 2359, it displays the wrong time.

Also, if you want it to display seconds, you must choose to not display the temperature and the seconds will display in that box.