1582 october calendar: 1582 was a common year starting

1582 was a common year starting on Monday in the Julian calendar , and a common year starting on Friday in the Gregorian calendar . It saw the beginning of the Gregorian calendar switch, the assassination of Oda Nobunaga in Japan, and the Raid of Ruthven in Scotland. As IFLScience explained in 2023, the Catholic church adopted the Gregorian calendar in October 1582 . Prior to this, most of Europe had used the Julian calendar , introduced by Julius Caesar... Learn how the Gregorian calendar , introduced in 1582 , corrected the inaccuracies of the Julian calendar by skipping some days. Find out when and how different countries adopted the new calendar system and how to convert between the two. In 1582 , Pope Gregory XIII announced that a 10-day chunk of October would be struck from the calendar . Not everyone was willing to play along.