Excitement over December 2012, rooted in the ancient Mayan long-count calendar, was promoted by the powers-that-be. So take it with a grain of salt.
John Major Jenkins has studied the Mayan calendar and cosmology for over 20 years, and written nine books on Maya cosmology and tradition. Check out his Web Site.
He claims that commercial interests got hold of the doomsday potential in the Mayan calendar story and suppressed the truth about it for the sake of profits. He says this about that:
There is ZERO evidence that the ancient Maya predicted the end of the world in 2012. … Over 2,000 years ago the early Maya … saw that the sun, on the winter solstice, was slowly moving toward the heart of the galaxy. … They suspected that the world would go through a transformation when the solar and the galactic planes aligned. They devised their Long Count calendar to target when the cosmic alignment would maximize, (and they) carved monuments for us to decode, … so that we can know exactly what they prophesied and believed about 2012.
Incredibly, at the early Maya site of Izapa in southern Mexico, the galactic cosmology and a profound spiritual teaching are preserved. Izapa speaks to us of the Galactic Alignment in 2012 as a transformative nexus in time, a still-point turnabout, inviting us to reconnect with our cosmic heart and eternal source. With the Divine Wisdom. (Not with Doom.)
So what is this alignment, and when would it be? Jenkins says, ” The Galactic Alignment is the alignment , as viewed from earth, of the December solstice sun with the Galactic equator. This alignment occurs as a result of the precession of the equinoxes (and occurs) only once every 26,000 (25,920, actually) years. (This) was what the ancient Maya were pointing to with the 2012 end-date of their Long Count calendar.” Jenkins coined the term, “era-2012” to refer to this alignment, which he centered on 1998, giving 18 years on either side (1980-2016). (But this pins it to 2012.) (And “March 31st, 2013 – Mayan End Date as theorized by Mayan Elder Don Alejandro Cirilo Perez Oxlaj)
John Major Jenkins is New Age in perspective. To see a Christian perspective on this, click this YouTube video.