In the United States of America, the holiday known as Washington's Birthday falls on the third Monday of February. As the name would suggest, it is a day marked in celebration of George Washington, the first President of the United States.
First declared a federal holiday in 1879 under the name of Washington's Birthday, the date used to coincide with the actual birthday of George Washington. It was later shifted to its new rotating date through The Uniform Holidays Act of 1968.
With the holiday now falling anywhere between the dates of February 15th to the 21st, the holiday can no longer fall on Washington's actual birthday, February 22nd. Because of this, the holiday is often referred to as President's Day, honoring not only Washington, but all of the Presidents who followed.