If you work with clients around the globe, keeping up with various time zones can be challenging. Happily, Tangerine Element’s iPhone and iPod touch $2.99 application, iTimeZone lets you easily control time for any city in the world. 

Aside from learning the current time in a given city, you can peer into the future or past with the flick of the iTimeZone wheel. It accurately calculates the date and time according to daylight savings time transitions, which allows you to confidently schedule meetings on the other side of the planet. 

It features details on 21,000+ cities, country flags, Google Map integration, day/night indicators, and more.