To be able to add any time zone, you need to have in geonames.org..
Choose the plugin's.zip file from your computer and click Install Now.
Upload analog-clock-widget folder to your in the wp-content plugins folder of your WordPress installation.
Scroll down through the list of Plugins to find the newly installed Plugin.
Click on the Activate link to turn the Plugin on...
You will then receive email with confirmation link and after you need to confirm the email you can enable your account for the webservice on your account page ).
Log in to your WordPress admin area and go to Appearance > Widgets.
Add Widget button next to the widget to add to your sidebar.
Customisable animated clock plug-in for WordPress lightweight plugin works well and clocks look great but you will need to disable page cacheing to get it to work accurately.
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
Read more