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::Proleptic Gregorian calendar

::concepts

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The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to dates preceding its official introduction in 1582. In countries that adopted the Gregorian calendar later, dates occurring in the interim (between 1582 and the local adoption) are sometimes "Gregorian-ized" as well.<ref>For example, George Washington was born on February 11, 1732 (Old Style), as Britain was using the Julian calendar. After the switch, that day became February 22, which is the date commonly given as Washington's birthday.</ref>


Proleptic Gregorian calendar sections
Intro  Usage  Difference between Julian and proleptic Gregorian calendar dates  See also  References  

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