The original section 3 of act Mar. 19, 1918, providing for daylight-savings, was repealed by act Aug. 20, 1919, ch. 51,
41 Stat. 280.
2007—
Pub. L. 110–69 substituted “fourth zone” for “third zone”.
1948—Act June 24, 1948, inserted proviso relating to common carriers.
Section 2 of act June 24, 1948, provided that: “This Act [amending this section] shall take effect at 2 o’clock antemeridian of the second Monday following the date of its enactment.”