Question

how can we prove that TIME is not same in whole universe

Answer 1

Answer:

The clocks measuring cosmic time should move along the Hubble flow. is a measure of time by a physical clock with zero peculiar velocity in the absence of matter over-/under-densities (to prevent time dilation due to relativistic effects or confusions caused by expansion of the universe).

Explanation:

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Answer 2

Using atomic clocks you can do that.. Or using oscillation of certain elements.

Or maybe do what twin paradox says.