If your answer was “Presidents’ Day,” you are only partially correct. Unofficially, that’s what the holiday is called, but according to the National Archives, it’s Washington’s Birthday. There is even an explanatory footnote:
This holiday is designated as “Washington’s Birthday.” Though other institutions such as state and local governments and private businesses may use other names, it is Federal policy to always refer to holidays by the names designated in the law.
If your answer was, “Monday, February 18,” you are an unspeakable literalist. But you are also correct.
Of course, my answer is, “Another damned working day in tax season.” For people in the accounting profession, there are no holidays between New Years and the end of tax season.