Display Timezone is a simple plug-in to display current time with timezone in the upper right of your admin screen on every page. It takes the values from the option Timezone, Date Format, Time Format and starts the clock. There is no configuration page. This helps for me to know the current time of which my blog is running on server and I can easily track at what time the scheduled post get activated(if you and your server at different timezone 
). When page loads the time taken from the database and convert it to the timezone, and then the clock will start count from that time. So both your pages the current time form the server.
Visit Plug-in Directory http://wordpress.org/extend/plugins/display-timezone/
I like your display timezone plugin. I am in Texas (US central time) and I have a client in London time. The servers hosting the site are in California (US pacific time). The site is set for London, and the time listed (in 12 or 24 hour format) always reads “am.” Do you have any recommendation?
@Kristin White
Thanks for the feedback, the “am|pm” issue is solved in the latest version(v 1.0.2). It will be available within hours. And my next wordpress plugin is about to release, please do visit. I have changed the project path to Tutorboy Apps so the display-timezone plugin feedback you can enter on the new location
Display Timezone http://apps.tutorboy.com/display-timezone/
It works perfectly now, thank you!
You welcome!!!
Check my new plugin, http://apps.tutorboy.com/wp-notify/