Pope Gregory XIII issues the papal bull "Inter gravissimas," reforming the calendar and introducing the Gregorian calendar which became effective on October 4, 1582 at which time it became October 15, 1582. It was quickly adopted by much of Catholic, but not Protestant, Europe which adopted it much later.
The Gregorian calendar is now widely used around the world. With the exception of Ethiopia, Nepal, Iran and Afghanistan, the Gregorian calendar is now the world's universal civil calendar, old style calendars remaining in use in religious or traditional contexts. More
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