The most recent calendar included here is the French Revolutionary Calendar, which was an attempt to further abandon the 'Ancien Régime' by decimalizing time and restructuring the calendar into twelve months of thirty days, with five or six holiday days left over. The major differences between each calendar was the starting points of the year and months, with some beginning with the arrival of spring, therefore having no fixed date, and the addition of leap years varied across all civilizations. However, historians agree that by 1CE (in the Gregorian calendar) the majority of civilizations had realized that one year lasted for approximately 365.25 days, and most of the more modern calendars split each year into twelve months. For example, the Mayan calendar did not develop in the same way as the Eurasian calendars, and cannot be included with this data, as January 1 st, 2020 is written as '13.0.7.2.7'. Mesoamerican and Asian civilizations focused more on cycles of years (such as the Chinese Zodiac), rather than recording centuries or millennia, therefore it is sometimes difficult to translate older calendars into modern terms. The Gregorian calendar lasts for approximately 365.24 days this means that most years have 365 days, with one extra day being added every fourth year, unless the year is divisible by 100 but not 400 (for example, the year 2000 was a leap year, whereas 21 will not be). The Gregorian calendar replaced the Julian calendar, which had been the most used calendar in Europe until this point. Today, the vast majority of the world uses what is known as the Gregorian calendar, Named after Pope Gregory XIII, who introduced it in 1582.
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