When a regular employee as defined by section 2105 of this title or an individual employed regularly by the government of the District of Columbia, whose pay is fixed at a daily or hourly rate, or on a piece-work basis, is relieved or prevented from working on a day—
(1) on which agencies are closed by Executive order, or, for individuals employed by the government of the District of Columbia, by order of the Mayor;
(2) by administrative order under regulations issued by the President, or, for individuals employed by the government of the District of Columbia, by the Council of the District of Columbia; or
(3) solely because of the occurrence of a legal public holiday under section 6103 of this title, or a day declared a holiday by Federal statute, Executive order, or, for individuals employed by the government of the District of Columbia, by order of the Mayor;
(Pub. L. 89–554, Sept. 6, 1966, 80 Stat. 516; Pub. L. 90–623, § 1(15), Oct. 22, 1968, 82 Stat. 1313; Pub. L. 96–54, § 2(a)(38), Aug. 14, 1979, 93 Stat. 383.)