1582 – This day does not exist in Austria, Italy, Poland, Portugal and Spain
The adoption of the Gregorian Calendar was an event in the modern history of most cultures and societies, marking a change from their traditional dating system to the modern dating system that is widely used around the world today.
The Gregorian calendar was decreed in 1582 by the papal bull Inter gravissimas by Pope Gregory XIII, to correct the erroneous assumption in the then-current Julian calendar that a year lasts 365.25 days, when in reality it is about 365.2422 days.
Philip II of Spain decreed the change from the Julian to the Gregorian calendar, which affected much of Catholic Europe, Spain and Portugal as well as much of Italy.
In these territories, as well as in the Polish–Lithuanian Commonwealth and in the Papal States, the new calendar was implemented on the date specified by the bull, with Julian Thursday, 4 October 1582, being followed by Gregorian Friday, 15 October 1582.
So effectively the Gregorian dates of Thursday the 14th, 1582 and before this never existed.
Today, the Gregorian calendar is the world’s most widely used civil calendar.
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