Convert any Gregorian date to the Mayan Long Count, the 260-day Tzolk’in cycle and the 365-day Haab’ calendar using GMT correlation 584283.
The Long Count measures linear days elapsed since the Mayan creation epoch (August 11, 3114 BCE).
The Goodman-Martínez-Thompson correlation links Julian Day 584,283 to the start of the Mayan creation date.