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  2. The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.

  3. Learn about the Gregorian calendar, the most widely used calendar in the world today, and its origin, design and leap year formula. Find out how it was replaced by the Julian calendar and how it is used in ISO 8601:2004.

  4. The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.

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