"Verbatim":http://en.wikipedia.org/wiki/Unix_time
bq. In some newer operating systems, time_t has been widened to 64 bits. In the negative direction, this goes back more than twenty times the age of the universe, and so probably suffices; however, if the approximately 293 billion representable years is a truly sufficient high number depends on the ultimate fate of the universe. It is certainly adequate for most practical purposes.
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