Universal time is based on:

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(C) The standard definition of the second in the International System of Units $(SI)$ is based on the atomic clock.Specifically,one second is defined

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Vibrations of cesium atom

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(C) The standard definition of the second in the International System of Units $(SI)$ is based on the atomic clock.Specifically,one second is defined as the duration of $9,192,631,770$ periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-$133$ atom.Therefore,universal time is based on the vibrations of the cesium atom.

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