We are living today in the cusp of the Mayan end times, the end of a galactic day or time period spanning thousands of years. One galactic day of 25,625 years is divided into five cycles of 5,125 years.
The Great Cycle of the Mayan Long Count calendar ends on the winter solstice of 2012 A.D. Following Mayan concepts of cyclic time and World Age transitions, this is as much about beginnings as endings. In fact, it was considered by the ancient Mayans to signify the creation of a new World Age. We are almost at the end of the fifth and final 5,125 year cycle!
The Mayans believed the universal processes, like the 'breathing' of the galaxy, are cycles that never change. What changes is the consciousness of man that passes through it. Always in a process toward more perfection. Based on their observations, the Mayans predicted that from the initial date of the start of their civilization, 4 Ahau, 8 Cumku which is 3113 B.C., after one cycle being completed 5,125 years in their future,
Only from our individual efforts could we avoid the path to great cataclysm that our planet will suffer to start a new era, the sixth cycle of the Sun. The Mayan civilization was in the fifth cycle of the Sun, and there were four other great civilizations before them that were destroyed by great natural disasters. They believed that each cycle was just one stage in the collective consciousness of humanity.
Excerpted from http://www.adishakti.org/mayan_end_times_prophecy_12-21-2012.htm