2012 Is it real?

The movie 2012 is a bout the end of the  world according to the Mayas. But what I do not get is did the people that made this movie based their ideas in the Mayan calendar I think that this is a possible idea but not entirely true. I think that if the Mayans did not finish their calendar that does not mean that it is the end of the world. Even though their calendar is the most accurate I hope they were wrong just for once.