4 U.S.C. § 6 — Time and occasions for display

(a) It's the universal custom to display the flag only from sunrise to sunset, on buildings and on flagstaffs that stay in one place outdoors. If people want a patriotic effect, though, the flag can be displayed all 24 hours of the day, as long as it's properly lit during the dark hours. (b) The flag should be raised quickly and briskly, and lowered slowly and ceremoniously. (c) The flag shouldn't be displayed in bad weather — unless it's a special all-weather flag made for that. (d) The flag should be displayed on all days, but especially on a long list of specific days: New Year's Day (January 1), Inauguration Day (January 20), Martin Luther King Jr.'s birthday (third Monday in January), Lincoln's Birthday (February 12), Washington's Birthday (third Monday in February), National Vietnam War Veterans Day (March 29), Easter Sunday, Mother's Day (second Sunday in May), Armed Forces Day (third Saturday in May), Memorial Day (at half-staff until noon, last Monday in May), Flag Day (June 14), Father's Day (third Sunday in June), Independence Day (July 4), National Korean War Veterans Armistice Day (July 27), Labor Day (first Monday in September), Constitution Day (September 17), Columbus Day (second Monday in October), Navy Day (October 27), Veterans Day (November 11), Thanksgiving Day (fourth Thursday in November), and Christmas Day (December 25) — plus any other day the President proclaims, each state's birthday (the date it was admitted to the Union), and each state's own holidays. (e) The flag should be displayed every day on or near the main administration building of every public institution. (f) The flag should be displayed in or near every polling place on election days. (g) The flag should be displayed on school days in or near every schoolhouse.