Presto’s Clock displays the current date and time (with optional time zone). The clock is available in two sizes and lets you select font color, make the background transparent or use an image as background. It supports 29 languages, and is also connected with World Time Zones.
In addition to offering a completely customizable date and time format (using the same format as PHP’s date function) it also supports an optional time zone offset and time zone label. By simply dragging multiple copies of the clock to your desktop, you can have two or more time zones displayed simultaneously.
The clock can also automatically dim at sunset, but unfortunately not for all time zones. (In the settings you are informed if dimming is supported in your time zone).