When the update finished and went to use my pattern to log on, it didn't recognize my correct pattern. The clock was 5 hours earlier and the device was in airplane mode. I had to wipe the device and start over. what gives?
This is a known intermittent bug. It seems to happen most often with tablets set up with multiple accounts, but I've had it happen to me during a trip. A factory reset and restore from backup is the only solution. If you enable a pattern or passcode it could recur. Fortunately, I have not had a recurrence.