when did calendar change from bc to ad
Anno Domini This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years from the start of this epoch, and BC denoting years before the start of the era. There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC. This dating system was devised in 525 by Dionysius Exiguus of Scythia Minor, but was not widely used until after 800.[9][10]
Hebrew calendar AM 5778 began at sunset on 20 September 2017 and will end at sunset on 9 September 2018.[2]
Hebrew calendar AM 5779 began at sunset on 9 September 2018 and will end at sunset on 29 September 2019.[2]
Indian national calendar Usage started officially at 1 Chaitra 1879, Saka Era, or 22 March 1957. However, government officials seem to largely ignore the New Year's Day of this calendar in favour of the religious calendar.[3]