The Story of the Calendar | Gregorian Calendar Adopted October 4, 1582

Pope Gregory XIII and a page from the Gregorian calendar (CC BY)

October 4th, 1582 was the last day of the Julian calendar. To sync to the Gregorian calendar, 10 days were skipped, making the next day October 15.

The Julian calendar was proposed by Julius Caesar in 46 BC and was put into use on January 1, 45 BC. It was very close to the actual length of the year but was still found to drift, leaving almost a…