I heard the calender didn't account for leap years and the world should have really ended 80 days ago. So I have my doubts.
The calculations DH read said sometime in August of 2011.
No, we don't think it will end 12/21. We're Christians and believe the verse Mark 12:32 - "No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father." Of course it could end that day, but I don't think there's any higher chance for the world ending on 12/21 than any other day.