The TimePlus app has a Digital Clock, 2 Alarm Clocks, 2 Countdown Timers, 4 World Clocks, and a Stopwatch. It displays the current time and date using futuristic graphics in one of 27 color themes, in Full-Screen Mode or Titlebarless Windowed Mode. There is a GigaClock for distance viewing and a NanoClock that's 480 x360.
Use the MODE button to toggle between Full-Screen and Titlebarless Windowed Mode.
All World Clocks, all Digital Clocks, and the Alarm Clocks show the current time in either 12-hour or 24-hour format.