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Use of the Gregorian calendar in the United States is a result of an Act of Parliament of the United Kingdom in 1751, which specified use of the Gregorian calendar in England and its colonies.

However, its adoption in the United Kingdom and other countries was fraught with confusion, controversy, and even violence.

The number of each year is based on the Dionysius numbering system.

(for more information on how it spread read our article What Did We Use Before BC and AD) The need for the introduction of the Gregorian Calendar came about because a year is not exactly 365 days long. Every four years, March 1st moved behind a day until after centuries instead of being early spring March 1st was now the beginning of winter. The Gregorian Calendar was introduced in the Catholic parts of Europe in 1582 A. by Pope Gregory XIII (then the religious leader of the Roman Catholic faith).

For example, 16 are leap years, but 1700, 1800, and 1900 are not.

"The legal code of the United States does not specify an official national calendar.

And economic pressures of a worldwide economy led by Europe and the United States.It was an improvement upon the Julian Calendar to keep the average length of the calendar year better in line with the seasons. The rules, months, and days of the Gregorian calendar are the same as those of the Julian Calendar, except for the leap year rules.In the Gregorian calendar, a year is a leap year if the year number is evenly divisible by 4. The number must be divisible by both 100 and 400 to be a leap year; otherwise it is not a leap year. Dionysius was asked to determine a method for calculating Easter that would then be used by the entire church. Other methods were also used which led to the confusion.