Exact Time (Atomic)
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This page displays an atomic clock synchronized to official atomic time. The clock shows exact real time using data from world time APIs that derive their time from atomic clocks. This atomic clock online display provides the most accurate time available.
Atomic clocks are the most accurate timekeeping devices ever created. They use the natural vibration frequency of atoms (typically cesium-133) to measure time. A single cesium atomic clock is accurate to within 1 second over 30 million years.
The official international atomic time (TAI) is maintained by the International Bureau of Weights and Measures (BIPM) in Paris, using data from over 400 atomic clocks around the world.
Our atomic clock page:
There are two primary atomic time scales:
Our atomic clock displays UTC (Coordinated Universal Time), which is the global standard for timekeeping.