We make it 2014 to invalidate the security certificate.
Once you have all the prompts cancelled, you can reboot and change the clock back.
If the clock has changed back itself - then you need to do it again. I'm not sure why the clock sometimes changes to auto-update automatically, but it's important that it is wrong when the PlayBook starts - as that's when it will test the AppWorld connection.
This is all from my personal experience, so your mileage may vary.
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