15 U.S.C. § 260a: Advancement of time or changeover dates

During the period commencing at 2 o’clock antemeridian on the second Sunday of March of each year and ending at 2 o’clock antemeridian on the first Sunday of November of each year, the standard time of each zone established by sections 261 to 264 of this title, as modified by section 265 of this title , shall be advanced one hour and such time as so advanced shall for the purposes of such sections 261 to 264, as so modified, be the standard time of such zone during such period; however, (1) any State that lies entirely within one time zone may by law exempt itself from the provisions of this subsection providing for the advancement of time, but only if that law provides that the entire State (including all political subdivisions thereof) shall observe the standard time otherwise applicable during that period, and (2) any State with parts thereof in more than one time zone may by law exempt either the entire State as provided in (1) or may exempt the entire area of the State lying within any time zone. It is hereby declared that it is the express intent of Congress by this section to supersede any and all laws of the States or political subdivisions thereof insofar as they may now or hereafter provide for advances in time or changeover dates different from those specified in this section. For any violation of the provisions of this section the Secretary of Transportation or his duly authorized agent may apply to the district court of the United States for the district in which such violation occurs for the enforcement of this section; and such court shall have jurisdiction to enforce obedience thereto by writ of injunction or by other process, mandatory or otherwise, restraining against further violations of this section and enjoining obedience thereto. Not later than 9 months after the effective date stated in subsection (b) [set out above], the Secretary [of Energy] shall report to Congress on the impact of this section [amending this section] on energy consumption in the United States. Congress retains the right to revert the Daylight Saving Time back to the 2005 time schedules once the Department [of Energy] study is complete.” that various studies of governmental and nongovernmental agencies indicate that daylight saving time over an expanded period would produce a significant energy savings in electrical power consumption; that daylight saving time may yield energy savings in other areas besides electrical power consumption; that daylight saving time over an expanded period could serve as an incentive for further energy conservation by individuals, companies, and the various governmental entities at all levels of government, and that such energy conservation efforts could lead to greatly expanded energy savings; and that the use of daylight saving time over an expanded period could have other beneficial effects on the public interest, including the reduction of crime, improved traffic safety, more daylight outdoor playtime for the children and youth of our Nation, greater utilization of parks and recreation areas, expanded economic opportunity through extension of daylight hours to peak shopping hours and through extension of domestic office hours to periods of greater overlap with the European Economic Community.” adopted pursuant to section 3(a)(2) of the Uniform Time Act of 1966 [ 15 U.S.C. 260a(a)(2) ] by a State with parts thereof in more than one time zone, or adopted pursuant to section 3(a)(1) of such Act by a State that lies entirely within one time zone, Notwithstanding any other law or any regulation issued under any such law, the Federal Communications Commission shall, consistent with any existing treaty or other agreement, make such adjustment by general rules, or by interim action pending such general rules, with respect to hours of operation of daytime standard amplitude modulation broadcast stations, as may be consistent with the public interest, including the public’s interest in receiving interference-free service. Such general rules, or interim action, may include variances with respect to operating power and other technical operating characteristics. Subsequent to the adoption of such general rules, they may be varied with respect to particular stations and areas because of the exigencies in each case.”