Wait, what day is it again? From The New Yorker:
According to some of the calendars and appointment books floating around this office, Monday, February 19th, is Presidents' Day. Others say it's President's Day. Still others opt for Presidents Day. Which is it? ... The answer, strictly speaking, is none of the above. Ever since 1968, when, in one of the last gasps of Great Society reformism, holidays were rejiggered to create more three-day weekends, federal law has decreed the third Monday in February to be Washington's Birthday. And Presidents'/'s/s Day? According to Prologue, the magazine of the National Archives, it was a local department-store promotion that went national when retailers discovered that, mysteriously, generic Presidents clear more inventory than particular ones, even the Father of His Country. Now everybody thinks it's official, but it's not.
And by the way, it's not Washington's actual birthday, either -- we missed that by nine days.