We have a service called ClockLink.com (http://www.clocklink.com/). This service enables you to select the clock from the library and place it on your blog or web page. This is the only free clock service that allows you to select the time zone and display the time based on the time zone of your choice.
We originally develop this service to use clock as a median to carry advertisement. Whenever a user moves the mouse cursor over the clock, the advertisement popup over the clock. When they click on the advertisement, they will be taken to the advertisers site. This is the idea behind ClockLink.com.
Here is the example of the clock that you can download from ClockLink.com.