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The '''Gregorian calendar''' is the [[calendar]] in contemporary use in most countries.
==HistoryIstorie==The Calendarul modern calendar began its existence in the Christian își începe existenta în eracrestina, in în anul 526, started by initiat de [[PopePapa]] John I. The chronologist of the PopeCronologistul Papei, Dionysius Exiguus, worked further on the calendara lucrat mai departe, especially concerning mai ales in ceea ce privește [[EasterPaștele]].
During the Middle Ages, some problems were discovered with the use of the [[Julian Calendar]]: every century had three to four days too many. In the sixteenth century the mistake grew to 10 days. Therefore, in 1582, it was decided that the calendar needed reform. [[Pope]] Gregory XIII decreed that [[October 4]] should be followed by [[October 15]] at once. Also, he decided that all of the leap days of the full century years which were not dividable by 400 would be omitted. In this manner, 1900 was not a leap year, 2000 was a leap year, and 2100 will not be.
