Monday = financial holiday in U.S.
copy/paste from Fidelity website:
Presidents’ Day Holiday
On Monday, February 20, 2017, the New York Stock Exchange (NYSE), Nasdaq, and other markets will be closed in observance of Presidents’ Day. Bond markets will be closed, and there will be no premarket or after-hours trading sessions. Banks and the U.S. Postal Service are closed as well. UPS will offer regular services.