Time Buddy - Time Buddy brings a colorful world clock.
Clocker - Keep track of people in different time zones
Time Zones Converter - Time Zones Converter is an application which as the name implies, is used for converting time zones.
World Clock iOS 8 Widget - Check the time, anytime. Just pull down Notification Center.
World Clock - World Clock is an app that lets you see the time of any city in the world.
Dato - Better menu bar clock with calendar and time zones