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To complicate matters, Washington was actually born on February 11 in 1731! How can that be? During Washington's lifetime, people in Great Britain and America switched from the Julian to the Gregorian calendar (something most of Europe had done in 1582).
Washington's Birthday was first celebrated as a holiday in the District of Columbia in 1880. It was made a federal holiday in 1885. The holiday was originally held on the anniversary of George Washington's birth, on February 22.