iOS push notification prompt no longer appearing

Today I was having trouble getting my app to prompt me for push notification preferences even when uninstalling and re-installing. It seems that the OS remembers these preferences (and others) for 24hrs even after deleting an app, so the only way to circumvent this and pretend you're on a completely clean install is this:

•  Delete your app from the device.
•  Turn the device off completely and turn it back on.
•  Go to Settings > General > Date & Time and set the date ahead a day or more.
•  Turn the device off completely again and turn it back on.
•  Re-install app