The calendar, which was created thousands of years ago by the Mayan civilization in Central America, stops at the Gregorian date of December 12, 2012. Many people have speculated that catostrophic events could occur when the date comes, Professor Gerardo Aldana, an associate professor of Chicana and Chicano Studies at U.C. Santa Barbara, said that the date could be inaccurate by 50 to 100 years or even more.
Aldana says that scholars have used the fixed numerical value called GMT constant to figure out the correlation between the Mayan and Gregorian dates. He says that the method has never been proven conclusively. Read more @TheEpochTimes