In the olden days, people would just say 'In the 4th year of King Whoever, or 'The 10th year after the Great Flood'.Nostradamus'omh » 18 Dec 2022, 10:04 am » wrote: ↑ Was there ever a Christian calendar invented? The Current Gregorian was somewhere between 15th and 18th century AD. and that came after international dateline became a social standard of relative time logistics.