DuplexClock is a tweak available since last evening in Cydia, being designed with the idea of giving us the opportunity to view the time in two locations on the globe in the status bar. In the image above you can see the functionality of the tweak and notice that on the left side of the center of the status bar we have the time displayed for one timezone, while on the right side we have the time displayed for another timezone.
DuplexClock allows you to have a second Clock / Time next to your Time in the Statusbar. You can configure the timezone for the second clock (and you can of course manage the first clock using Apple's clock settings).
DuplexClock has a settings menu available in the Settings application iOS 7, and through it we can choose the timezone we want to display in the status bar. iOS 7 it will display a time based on the setting made by you for the native timezone of the operating system, while the tweak also adds a second clock for a separate timezone chosen by you.
DuplexClock it is available for free in the repo BigBoss al Cydia.
