An arrangement of twelve pits and an arc found in Warren Field, Aberdeenshire, Scotland, dated to roughly 10,000 years ago, has been described as a lunar calendar and was dubbed the “world’s oldest known calendar”.
They would all sing “draw me a wee plan” and dance naked and off their collective mesolithic noggins until the dawn of a more refined age.
People in 9CE actually called it the 36th year of the reign of Caesar Augustus, or, the 13th year of Herod Antipas. And no one knew it was Christmas until the Gospels were written.
@rebbel Which question is a good question? Do you mean when did the Europeans accept the current calendar? That I don’t know. Probably depends what part of Europe. Wasn’t the Julian calendar before the Gregorian? What about the Roman calendar, did it use BC and AD?
@JLeslie AD was first adopted in 525 by church historians.
Before that, Roman (and by extent the lands that were in the Roman Empire) marked years by time from the founding of Rome (753 BC), the founding of The Republic (510 BC), the year of the consuls, and after Julius Caesar, the year of the emperor.