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Time is defined operationally to be that which is measured by clocks. The SI unit of time is the second, which is defined to be "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 caesium 133 atom."

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Why is time explained differently?

In quantum mechanics time is a classical background parameter and the flow of time is universal and absolute. … How can these two concepts of time be reconciled? …