World Clock Pro for iPhone
Meet the World Clock Pro: another app that helps you manage your time and interact with people in various countries without losing track of time zones. This app is an international time zone converter that gets the job done with the flick of a finger. You can select from over 142,000 cities and timezones.
The app comes with a widget for your phone. You have the option to go forward and backward in time. Thanks to World Clock Pro, you can compare multiple time zones to find the best time to contact people in other countries. You will need iOS 8.0 or later to run this.