There is a time when the Taskbar's little watch does not seem to be the best way to show your computer time. So other, there are more color options such as TzClock
TzClock is a free and open source application that adds fully customizable unlock watches to your desktop.
There are several options to choose your time zone: Greenwich Time, Geo Location or Local Time. It comes with a simple calendar. You can change the look and even add additional watch to the display, each coming with its own independent settings.
And if all this was not enough, TzClock included a stopwatch-style wristwatch.