Calendar

Calendar

46 BCE

While the Sumerian lunar calendar had been in use since about 2000 BCE, the invention of the Julian calendar — a reform of the earlier Roman calendar — by Julius Caesar in 46 BCE proved to be one of the most resilient and well used of all time. Indeed, it wasn’t until 1582 that it was superseded by the Gregorian calendar, which was introduced by Pope Gregory XIII. Today, the Gregorian calendar is internationally the most widely used calendar.