Determine if day change has occurred

I would like to create a notifciation that occurs every time a new day has occurred locally (either while using the app, or if it occurs in between launches). I was wondering what might be the best way to go about observing this change.


While your app is running, you can listen for the UIApplicationSignificantTimeChangeNotification notification and test the current day when you receive that. When your app quits, you can save the current day to your preferences, and when the app launches again, you can test the saved day against the current day.

You can get information about the current day using NSDateComponents.

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