For the past four hundred years, much of the modern world has been using the Gregorian calendar. As we are all familiar, this calendar has 12 months, 365 days in a year and an extra day every leap year. Leap years occur every four years except for years that are exactly divisible by 100, unless they are also exactly divisible by 400. Introduced by Pope Gregory XIII in 1582 as a reform of the Julian calendar, the Gregorian calendar is universally accepted because it is regular and easy way to understand. But it wasn’t always like this.
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The Roman Calendar
Source: amusingplanet.com