The Gregorian calendar is used today in the large majority of countries.

UNESCO: International Women��s Day: why the 8 of March?

Clavius started his career by taking on the reform of the Gregorian calendar, a project partly inspired by Copernicus and his book.

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In 1582, in Italy and Spain, this day became the first day of the Gregorian Calendar after it was adopted by Pope Gregory XIII.

CNN: Tuesday,

In 1752, Britain and its colonies adopted the Gregorian calendar.

CNN: Monday,

This was New Year's Day until the 18th Century, and the tax year got separated from it when we jumped 11 days switching to the Gregorian calendar in 1752.

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Britain adopted the Gregorian calendar only in 1752.

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"Millennial festivities would not even exist were it not for the Gregorian calendar structured around the birth of Jesus Christ, " said the writer, who pointed out that China had its own well-established dating system centuries before the Western one went into effect.

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Before the Revolution, Russia had not yet adopted the Gregorian calendar, introduced by Pope Gregory XIII in 1582 to mitigate the errors of the Julian calendar, which owes its name to the Roman emperor who had chosen it 46 years before the birth of Jesus Christ.

UNESCO: International Women��s Day: why the 8 of March?