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15 U.S.C. § 261 — Zones for standard time; interstate or foreign commerce
Federal law — U.S. Code and appendices · legal_authorities
**(a) In general** For the purpose of establishing the standard time of the United States, the territory of the United States shall be divided into nine zones in the manner provided in this section. Except as provided in [section 260a(a) of this title](https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim-title15-section260a/a&num=0&edition=prelim), the standard time of the first zone shall be Coordinated Universal Time retarded by 4 hours; that of the second zone retarded by 5 hours; that of the third zone retarded by 6 hours; that of the fourth zone retarded by 7 hours; that of the fifth zone retarded 11 So in original. Probably should be followed by “by”. 8 hours; that of the sixth zone retarded by 9 hours; that of the seventh zone retarded by 10 hours; that of the eighth zone retarded by 11 hours; and that of the ninth zone shall be Coordinated Universal Time advanced by 10 hours. The limits of each zone shall be defined by an order of the Secretary of Transportation, having regard for the convenience of commerce and the existing junction points and division points of common carriers engaged in interstate or foreign commerce, and any such order may be modified from time to time. As used in sections 261 to 264 of this title, the term “interstate or foreign commerce” means commerce between a State, the District of Columbia, the Commonwealth of Puerto Rico, or any possession of the United States and any place outside thereof.
**(b) Coordinated Universal Time defined** In this section, the term “Coordinated Universal Time” means the time scale maintained through the General Conference of Weights and Measures and interpreted or modified for the United States by the Secretary of Commerce in coordination with the Secretary of the Navy.
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Source file: Laws/federal/codes/united-states-code/title-15/section-261-zones-for-standard-time-interstate-or-foreign-commerce--dddede4d2e.md
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Source location: Title 15, Chapter 6, § 261; chapter-006-weights-and-measures-and-standard-time.md
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**(a) In general** For the purpose of establishing the standard time of the United States, the territory of the United States shall be divided into nine zones in the manner provided in this section. Except as provided in [section 260a(a) of this title](https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim-title15-section260a/a&num=0&edition=prelim), the standard time of the first zone shall be Coordinated Universal Time retarded by 4 hours; that of the second zone retarded by 5 hours; that of the third zone retarded by 6 hours; that of the fourth zone retarded by 7 hours; that of the fifth zone retarded 11 So in original. Probably should be followed by “by”. 8 hours; that of the sixth zone retarded by 9 hours; that of the seventh zone retarded by 10 hours; that of the eighth zone retarded by 11 hours; and that of the ninth zone shall be Coordinated Universal Time advanced by 10 hours. The limits of each zone shall be defined by an order of the Secretary of Transportation, having regard for the convenience of commerce and the existing junction points and division points of common carriers engaged in interstate or foreign commerce, and any such order may be modified from time to time. As used in sections 261 to 264 of this title, the term “interstate or foreign commerce” means commerce between a State, the District of Columbia, the Commonwealth of Puerto Rico, or any possession of the United States and any place outside thereof.
**(b) Coordinated Universal Time defined** In this section, the term “Coordinated Universal Time” means the time scale maintained through the General Conference of Weights and Measures and interpreted or modified for the United States by the Secretary of Commerce in coordination with the Secretary of the Navy.
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Federal law — U.S. Code and appendices · legal_authorities
The Panhandle and Plains sections of Texas and Oklahoma are transferred to and placed within the United States standard central-time zone.
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Federal law — U.S. Code and appendices · legal_authorities
Page 647
TITLE 15—COMMERCE AND TRADE
§ 261
1 So in original. Probably should be followed by ‘‘by’’.
STUDY AND REPORT ON ENERGY CONSUMPTION;
REVERSION
Pub. L. 109–58, title I, § 110(c), (d), Aug. 8, 2005, 119
Stat. 615, provided that:
‘‘(c) REPORT TO CONGRESS.—Not later than 9 months
after the effective date stated in subsection (b) [set out
above], the Secretary [of Energy] shall report to Con-
gress on the impact of this section [amending this sec-
tion] on energy consumption in the United States.
‘‘(d) RIGHT TO REVERT.—Congress retains the right to
revert the Daylight Saving Time back to the 2005 time
schedules once the Department [of Energy] study is
complete.’’
CONGRESSIONAL FINDINGS; EXPANSION OF DAYLIGHT
SAVING TIME
Pub. L. 99–359, § 2(a), July 8, 1986, 100 Stat. 764, pro-
vided that: ‘‘The Congress finds—
‘‘(1) that various studies of governmental and non-
governmental agencies indicate that daylight saving
time over an expanded period would produce a signifi-
cant energy savings in electrical power consumption;
‘‘(2) that daylight saving time may yield energy
savings in other areas besides electrical power con-
sumption;
‘‘(3) that daylight saving time over an expanded pe-
riod could serve as an incentive for further energy
conservation by individuals, companies, and the var-
ious governmental entities at all levels of govern-
ment, and that such energy conservation efforts
could lead to greatly expanded energy savings; and
‘‘(4) that the use of daylight saving time over an ex-
panded period could have other beneficial effects on
the public interest, including the reduction of crime,
improved traffic safety, more daylight outdoor play-
time for the children and youth of our Nation, great-
er utilization of parks and recreation areas, expand
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