Archaeologists working at the ancient Maya site of El Palmar in Campeche, Mexico, have discovered what may be the earliest known Long Count calendar date in the Maya lowlands. It is carved into a stone monument and is interpreted as Aug. 31, AD 180, in our modern calendar.
Source: [Phys.org](https://phys.org/news/2026-06-oldest-maya-calendar-date-reveal.html)