Standard Time Act

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Standard Time Act
Great Seal of the United States
Long title An Act to save daylight and to provide standard time for the United States.
Nicknames Calder Act
Standard Time Act of 1918
Enacted by the 65th United States Congress
Effective March 19, 1918
Citations
Public Law 65-106
Statutes at Large 40 Stat. 450
Legislative history

The Standard Time Act of 1918, also known as the Calder Act, was the first United States federal law implementing Standard time and Daylight saving time in the United States.[1] It authorized the Interstate Commerce Commission to define each time zone.

The section concerning daylight saving time was repealed by the act titled An Act For the repeal of the daylight-saving law, Pub.L. 66–40, 41 Stat. 280, enacted August 20, 1919, over President Woodrow Wilson's veto.

Section 264 of the act mistakenly placed most of the state of Idaho (south of Salmon River (Idaho)) in UTC−06:00 CST Central Standard Time, but was amended in 2007 by Congress to UTC−07:00 MST Mountain Standard Time.[2] MST was observed prior to the correction.

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