App Submission to App-Store - Minor bug fix

Hello, I have existing iPhone (DAILY DEAL) app and i want to fix this issues: 1- Deal Time: Deal must end at 12AM +3GMT, Now deal ends at 7AM or 7:30AM +3GMT i'm not 100% sure. 2- When i submit the app to app-store they reject the app with the following reason: Non-public API usage: *Apps are not permitted to access the UDID and must not use the uniqueIdentifier method of UIDevice. Please update your apps and servers to associate users with the Vendor or Advertising identifiers introduced in iOS 6. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed. Best Regards, Abdullah