Compatible with iOS 5 and 6
WorldClockCenter is a plugin for the Notification Center.
It allows you to display the clocks you have configured inside your mobileTimer.app.
NotificationCenter addons can be configured from the Settings app, in the Notifications panel. The options for this widget can be viewed in the Settings app. Activate the plugin in your notification center configuration.
Configure plugin options from Settings > WorldClockCenter
See larger Screenshots below