when was the gregorian calendar created
1. The original goal of the Gregorian calendar was to change the date of Easter. In 1582, when Pope Gregory XIII introduced his Gregorian calendar, Europe adhered to the Julian calendar, first implemented by Julius Caesar in 46 B.C. Since the Roman emperorâs system miscalculated the length of the solar year by 11 minutes, the calendar had since fallen out of sync with the seasons.