What event is the beginning of the calendar?

The answer to this question depends on what chronology system a particular people uses. Most countries in the world today use calendars, the dates in which are counted from the moment of the birth of Jesus Christ. Now, according to this system, it is 2020. In Judaism, a different calendar is used, where the chronology comes from the moment of the creation of the world. Muslim peoples also have their own calendar. They count down the dates from the moment of Hijra, the sacred date for the Prophet Muhammad.