GMT Slider allows to compare time zones from different cities around the world. Add city or exact time zone, drag slider and see the time.
Save the link with added cities/zones, and bookmark it or give to your colleague or friend.
Add time zones you need and get widget for your site for free!
Just follow @GMTSlider in twitter and send a direct message with city or time zone and receive their current time e.g. "d gmtslider London, PST, GMT+10"