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Presumably, several billion years ago, SOMETHING happened (big bang being the most popular theory).
Since space and time are indelibly linked (AFAIK, fourth dimension = time, spacetime and all that), then the beginning of the universe as we know it would have also been the beginning of time as we know it. If all of the matter in the universe was packed infinitely tighter than an atom, then something was almost definitely different with time as well.
thus, juju: if at some time in the distant past the universe did not exist, then I'd guess that time could not have existed either.
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