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Simply Calenders

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The Gregorian Calendar

Gregorian Calendars

Although various calendars are in existence throughout the world, "Simply Calenders" is based purely on the Gregorian Calendar which is in use throughout most of the Western world.


The Gregorian Calendar was devised by Pope Gregory XIII and decreed in a papal bull in 1582. It was based on the earlier Julian Calendar introduced by Julius Caesar in 45 BC. However, the Gregorian calendar had new rules for determining leap years that kept it more in line with the solar year.


The Gregorian calendar was adopted by most Catholic countries shortly after 1582. Many protestant countries delayed its adoption: Great Britain and its dominions (including what is now the USA) delayed its introduction until 1752. Most Asian, East European and Orthodox countries did not change until after the start of the 20th century.

The validity of calendars produced by this program is dependent on the adoption of the Gregorian calendar in any given country.


The Gregorian calendar is essentially a solar calendar based on the solar year. Although often referred to as the “Christian Calendar”, much of its origins are, in fact, pre-Christian and pagan.


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