when did we start using the christian calendar
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]
ICD-10 Work on ICD-10 began in 1983 and was completed in 1992.[1]
Paris Peace Accords
Sunday The international standard ISO 8601 for representation of dates and times, states that Sunday is the seventh and last day of the week.[5] This method of representing dates and times unambiguously was first published in 1988.