when were the days of the week invented
Week A continuous seven-day cycle that runs throughout history paying no attention whatsoever to the phases of the moon was probably first practiced in Judaism, dated to the 6th century BC at the latest.[8][9]
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.
ICD-10 Work on ICD-10 began in 1983 and was completed in 1992.[1]