Not sure anyone can predict an exact date for anything, but this might give you a partial idea why things are a little wonky:
(Also, Polar Shift and Polar Reversal are two similar but different things)
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NASA's confirmed 2012 prediction - Deterioration of Earth's Magnetosphere during Sun's Polar shift in 2012 :
Monday, April 27, 2009
Scientists have now accepted that the intersection of 2 problems - the deterioration of Earth's Magnetosphere during the Sun's Polar shift in 2012 (as recently discussed) will be the real concern as we approach 2012 :