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  1. National Institute of Standards and Technology | NIST

    Today: 12/30/2025 01:24:46 P.M. Your clock is off by: +0.027 s About/Contact FAQ

  2. Time.is - exact time, any time zone

    5 days ago · Time.is displays exact, official atomic clock time for any time zone (more than 7 million locations) in 58 languages. What time is it? 几点了? क्या समय हुआ है? ¿Qué hora es? Quelle …

  3. Atomic clock - Wikipedia

    An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on the fact that atoms have quantised energy levels, and transitions between such levels are driven …

  4. Atomic Clocks | NIST

    For three-quarters of a century, scientists have used nature’s perfect timekeepers — atoms — to build the best clocks the world has ever seen. Atomic clocks have revolutionized how we tell time.

  5. How Do Atomic Clocks Work? - timeanddate.com

    In an atomic clock, the natural oscillations of atoms act like the pendulum in a grandfather clock. However, atomic clocks are far more precise than conventional clocks because atomic oscillations …

  6. iTime.live: The Atomic-Precision World Clock

    2 days ago · Get precise atomic time for any city worldwide. Synchronized with PTB Atomic Clock, accurate to the microsecond. Perfect for global scheduling.

  7. Some of the World’s Atomic Clocks Were Off Last Week (by 5 …

    Dec 22, 2025 · Some of the World’s Atomic Clocks Were Off Last Week (by 5-Millionths of a Second) How some of the world’s most precise clocks missed a very small beat. Listen to this article · 3:14 …

  8. Time.ms - Exact Time Atomic Clock

    2 days ago · Time.ms - Get the exact time now with the world's most accurate atomic clock. Precise millisecond synchronization with global network infrastructure for exact current time display.

  9. Atomic clock | Timekeeping, Accuracy & Benefits | Britannica

    Atomic clock, type of clock that uses certain resonance frequencies of atoms (usually cesium or rubidium) to keep time with extreme accuracy. The electronic components of atomic clocks are …

  10. How Do Atomic Clocks Work? | NIST

    Aug 22, 2024 · Read on to learn how different atomic clocks work, how atomic clocks help us tell time, the history of this remarkable technology and how atomic clocks have opened up profound and …