Is it possible to change/set the alarm clock from a different application on the iPhone

Is it possible to access information like the alarm clock time and change it from a different application on the iPhone. And if i开发者_Python百科ts possible to do it, can it be approved by the app store to sell it?

You can certainly do it—the CFPreferences API would probably be the right approach—but you definitely wouldn't get allowed into the App Store. If you're looking to make an alarm-clock application, check out the Scheduling Local Notifications docs.