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The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
Standard time is the synchronization of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at some meridian that passes through the region, often near the centre of the region. Historically, standard time was established during the 19th ...
This article is about the U.S. statute. For the Irish statute, see Standard Time Act, 1968. For the New Zealand statute, see Standard Time Act 1945. Standard Time Act 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 ...
Exactly 141 years ago at high noon, time changed forever in America. In Boston, time moved forward 16 minutes. In Baltimore 6. New Yorkers lost about 4 minutes. Those in Atlanta said goodbye to 22 ...
It is ultimately the authority of the secretary of transportation, in coordination with the states, to determine which regions will observe which of the standard time zones and if they will observe daylight saving time. [7] As of August 9, 2007, the standard time zones are defined in terms of hourly offsets from UTC. [8]
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset. The UTC offsets are based on the current or upcoming database rules.
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.
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