Hot Alarm Clock offers multiple clocks to display the time in different time zones.

You can create floating windows that display your current time, or the time in other time zones or cities.

Clock Settings

Use system time zone
If you check this checkbox, the clock will display your computer's current time. To make the clock display time in a different city or time zone, uncheck this checkbox and select a preferable city in the Time zone field.
Show clock in floating window
If you check this checkbox, a floating window will be displayed on your desktop. You can select the round analog clock or the digital clock. For more details about settings, please read the Floating Windows section. By selecting the Analog option for a clock, you can display a round clock face, which might look nicer than an "analog" timer.

Clock Faces