Dual Clock app for iPhone and iPad
Want to know what the local time would be in any city in the world at this instance - use Dual Clock. This app provides two clocks, one for local zone and the other for a remote city. Both clocks adhere to well-defined DST rules for 400+ cities in the world. The clocks adjust appropriately on DST transition and are perpetual. The clocks are so accurate that you will never need to refer to any other clock to check the time in any remote city in the world. Dual Clock also provides accurate and useful DST information on each clock.