LP, Second law of thermodynamics..Entropy always increases which is the level of chaos in a system. At one point of time entropy will be max which is the state of ultimate chaos or a hetrogeneous state of the universe. After that, nothing can change.

But, what has it to do with time? I agree we will not be able to measure time because there would be no events, but this is the same now as well. If we do not record any two events, we cannot measure the time between the two.