To be fair the calender that Nostradamus used to predict world events was different to the one we use now. As a result of this change twelve years never happened.
I would'nt lose any sleep over it, remember the milennium bug?
The end of the world (according to some scientists) will come from an overdue flu pandemic, a volcanic super eruption in Yellow Stone national park in America or a collapse of the Icelandic land shelf.
Oh and global warming and asteroid strikes, and the Muslims, and the Communists....