If you can benefit from having quick access to different time zones, you might want to check out the World Clock 7 ( see above ) – a new Cydia tweak that allows you to set up up to three different time zones on your iOS 7’s Lock Screen at once. You own time zone will be shown in the middle just like it normally does but the tweak will add two more customizable time zones, one on the right side of the Lockscreen and one on the left side.
World Clock 7 comes with its own preference pane in Settings.app from where you can enable/disable the tweak, configure time zones and configure the left and right clocks to be named anything you want. NOTE: The tweak also changes the font of your Lock Screen clock.
If you want to give World Clock 7 a try, the tweak is available for $1.5 on Cydia Store via BigBoss repo…