"FWC said the owl’s normal diet of insects, reptiles, birds, frogs and rodents means a cruise ship is not an ideal long-term habitat."
Great, another passenger complaining about the lack of good food on board.
The app and website can have different dates due to different uses of time zones between the two.
Rest assured in 99% of cases check-in will open on or shortly after midnight (midnight of the time zone the ship departs from) 45 days prior to the cruise.
There is a whole forum devoted to Carnival.
Though I'm glad RC doesn't have to beef up security and send out warning letters to all spring break cruise passengers reminding them to behave.