Mayan scholars have been attempting to correlate the Long Count with our Western Gregorian calendar, since the beginning of this century. There has been massive variation in the suggested correlations, but as early as 1905, Goodman suggested a correlation only 3 days from the most popular one today. Known as the GMT correlation, or "correlation # 584283."

This was finalized in 1950, and puts the start of the Great Cycle ( day 0.0.0.0.0) on 11th August 3114 BC, and the end-date (known as 13.0.0.0.0.) as 21st December 2012. However recent studies analyzing Mayan mathamatics, and units of measurement reveal massive discrepancies between Goodman’s original date and the actual date of alignment, DECEMBER 15, 2012.