I have been summoned by one of the Great Council of Slann (long may he ribbit) and have translated the golden plaques. The End Times have come! Spoiler: but seriously now - calendar depicted is the Aztec calendar, not the Mayan calendar. - Mayan calendar has a start date, but has no end date. - Dec 21 2012 marked a start of a new baktun, kinda like the transition from 1999 to 2000. Behold: Gregorian calendar---> Mayan Calendar Dec 20, 2012---> 12.19.19.17.19 Dec 21, 2012---> 13.0.0.0.0 Today's date Mar 24, 2020---> 13.0.7.6.10 Next baktun change will be ~400 years from now. Mar 26, 2407---> 14.0.0.0.0 I expect many new memes (probably in hologram format) will be generated in the 10 years prior to 2407. So speaks the Great Calendar. More info on both Lizardmen and real world Mayan calendars here.