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  1. www.nist.gov › pml › time-and-frequency-divisionLocal Time FAQs | NIST - National Institute of Standards and ...

    Feb 3, 2010 · For more details on U.S. time zones, the federal law on time zones is defined in United States Code; Title 15 - Commerce and Trade; Chapter 6 - Weights and Measures and Standard Time; Subchapter IX - Standard Time; Sections 260-267. See United States Law on Standard Time, 15 U.S.C. §6(IX)(260-7). NIST is an agency of the United States ...

  2. www.timeanddate.com › time › zoneTime Zones in the United States - timeanddate.com

    The United States' Time Zone History The US was divided into 4 standard time zones on November 18, 1883, and jurisdiction for the zones was given to the Interstate Commerce Commission (ICC). Since 1967, the US Department of Transportation (DOT) has been responsible for governing time zones in the country.

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  4. en.wikipedia.org › wiki › Time_in_the_United_StatesTime in the United States - Wikipedia

    In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation, but no ...

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  5. www.time.govNational Institute of Standards and Technology | NIST

    The National Institute of Standards and Technology - Time and Frequency Division maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology.

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  7. www.transportation.gov › regulations › time-actUniform Time | US Department of Transportation

    Mar 11, 2024 · The U.S. Department of Transportation (DOT) oversees the Nation's time zones. The oversight of time zones was assigned to DOT because time standards are important for many modes of transportation. DOT regulations at 49 CFR part 71 contain the official listing of the Nation's time zones. DOT also oversees the Nation's uniform observance of ...

  8. www.worldatlas.com › time-zones › usa-time-zonesUSA Time Zones - WorldAtlas

    May 21, 2021 · The contiguous US observes four time zones, while Hawaii, Alaska, and each of the five territories has its time zone. The Department of Transportation regulates the DST and time zone boundaries in the US. Contiguous Time Zones USA Time Zone map. The 6 time zones used by the US States.

  9. time.com › 5730146What Happened the Day the US Adopted Standardized Time Zones ...

    Nov 18, 2019 · November 18, 2019 12:00 PM EST. N ov. 18, 1883 was a chilly Sunday in New York City. In fact, cold days had become the norm across a swath of the nation, resulting from the sun-blocking ash in the ...

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