Prior Provisions
The original section 3 of act Mar. 19, 1918, providing for daylight-savings, was repealed by [act Aug. 20, 1919, ch. 51], [41 Stat. 280].
Amendments
2007—[Pub. L. 110–69] substituted “fourth zone” for “third zone”.
1948—Act June 24, 1948, inserted proviso relating to common carriers.
Statutory Notes and Related Subsidiaries
Effective Date of 1948 Amendment
[Act June 24, 1948, ch. 631, § 2], [62 Stat. 646], 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.”