1582 october calendar: That was life for Europeans in the

That was life for Europeans in the late 16th century after 10 days were eliminated from the Gregorian calendar . In 1582 , if you lived in a Catholic country, the calendar went from October 4 to October 15 —the dates in between just didn't exist. Thus, in countries that adopted the reform, Thursday, October 4, 1582 , was directly followed by Friday, October 15, 1582 . This adjustment effectively “erased” 10 days from history, a move that was necessary to reset the vernal equinox to March 21, the date it had been during the Council of Nicaea in 325 AD. Discover why 10 days disappeared in October 1582 with our detailed overview of the Gregorian calendar reform. Learn about its impact on society, its historical context, and the global adoption of the new calendar system. The Gregorian calendar reform officially kicked in on October 4, 1582 . Ten days vanished overnight in Catholic countries like Spain, Portugal, Italy, and Poland.