Code of Federal Regulations Title 17. Commodity and Securities Exchanges § 17.201.104 Business hours

The Headquarters office of the Commission, at 100 F Street, NE., Washington, DC 20549, is open each day, except Saturdays, Sundays, and Federal legal holidays, from 9 a.m. to 5:30 p.m., Eastern Standard Time or Eastern Daylight Saving Time, whichever is currently in effect in Washington, D.C. Federal legal holidays consist of New Year's Day;  Birthday of Martin Luther King, Jr.;  Presidents Day;  Memorial Day;  Independence Day;  Labor Day;  Columbus Day;  Veterans Day;  Thanksgiving Day;  Christmas Day;  and any other day appointed as a holiday in Washington, D.C. by the President or the Congress of the United States.