Just to muddy the waters a little more, Calleman's evolution of consciousness (which Ian Lungold based his work on) puts the beginning of the final underworld at Feb 10th 2011, with 13 day and night cycles of 20 days each. Haven't worked it out exactly but I believe it puts the end of the evolution somewhere in November 2011.
http://www.mayanmajix.com/TZOLKIN/DT/DT.html