To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

Uniform Time Act

From Wikipedia, the free encyclopedia

Uniform Time Act
Great Seal of the United States
Long titleAn Act to promote the observance of a uniform system of time throughout the United States.
NicknamesUniform Time Act of 1966
Enacted bythe 89th United States Congress
EffectiveApril 1, 1967
Public law89-387
Statutes at Large80 Stat. 107
Acts amendedStandard Time Act of 1918
Titles amended15 U.S.C.: Commerce and Trade
U.S.C. sections created15 U.S.C. ch. 6, subch. IX §§ 260–267
Legislative history
  • Introduced in the Senate as S. 1404
  • Passed the House on March 16, 1966 (292–93, in lieu of H.R. 6785)
  • Reported by the joint conference committee on March 30, 1966; agreed to by the House on March 30, 1966 (282–91) and by the on  
  • Signed into law by President Lyndon B. Johnson on April 13, 1966

The Uniform Time Act of 1966, Pub.L. 89–387, 80 Stat. 107, enacted April 13, 1966, was a Law of the United States to "promote the adoption and observance of uniform time within the standard time zones" prescribed by the Standard Time Act of 1918. Its intended effect was to simplify the official pattern of where and when daylight saving time (DST) is applied within the U.S. Prior to this law, each state had its own scheme for when DST would begin and end, and in some cases, which parts of the state should use it.[1]


The law, as originally written, required states that observe DST to begin it at 2 a.m. local time on the last Sunday in April, and to end it at 2 a.m. local time on the last Sunday in October and explicitly preempted all state laws related to daylight saving time per the weights and measures power given to Congress in Article 1, Section 8 of the U.S. Constitution. The law was later amended in 1986 to move the uniform start date for DST to the first Sunday in April (effective 1987). The latest amendment, part of the Energy Policy Act of 2005, extends DST by four or five weeks by moving the uniform start date for DST to the second Sunday in March and the end date to the first Sunday in November (effective 2007). The Department of Energy was required to report to Congress the impact of the DST extension by December 1, 2007 (nine months after the statute took effect). The report, released in October 2008, reported a nationwide electricity savings of 0.03% for the year of 2007.[2]


The law does not require that all states observe DST. Individual states may exempt themselves from DST and observe standard time year-round by passing a state law, provided:

  • if the state lies entirely within a time zone, that the exemption apply statewide, or
  • if the state is divided by a time zone boundary, that the exemption apply statewide or to the entire part of the state on one side of the boundary.


Arizona time zones
Arizona time zones

The most noteworthy non-observers of daylight saving time are the states of Arizona and Hawaii. Indiana also had not observed daylight saving time before 2 April 2006.[3]

The commonwealths of the Northern Mariana Islands and Puerto Rico and the territories of American Samoa, Guam, and U.S. Virgin Islands also do not observe Daylight Saving Time.[4]

The various Native American nations within Arizona have the right to use or not use DST. The Navajo Nation has chosen to use DST throughout its territory, which includes parts of New Mexico and Utah. In contrast, the Hopi Nation, whose territory is surrounded entirely by the Arizona portion of the Navajo Nation, has chosen not to use DST.

See also


  1. ^ Jennifer Vernon (March 31, 2006). "The HIstory of Daylight Saving Time". National Geographic. Retrieved June 23, 2012.
  2. ^ Belzer, David B. (October 2008). Impact of Extended Daylight Saving Time on National Energy Consumption. U.S. Department of Energy. "Archived copy" (PDF). Archived from the original (PDF) on May 18, 2013. Retrieved October 21, 2013.CS1 maint: archived copy as title (link)
  3. ^ Justin L. Mack (March 8, 2019). "Looking back at Indiana's complicated relationship with time: Why Indiana observes daylight saving time". IndyStar. Retrieved November 24, 2020.
  4. ^ Jennifer Vernon (March 31, 2006). "The History of Daylight Saving Time". National Geographic. Retrieved June 23, 2012.
This page was last edited on 23 January 2021, at 19:07
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.