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It's worth saying a few words about the range of dates that can be represented as time_t's. A very common time_t representation (based on Unix and Posix) is the number of seconds since midnight (GMT), January 1, 1970. If time_t is a 32-bit integer, the range is therefore from 1970 until at least January 18, 2038, plus perhaps another 68 years before 1970 or after 2038 depending on whether time_t is signed or unsigned. If time_t is a 64-bit integer, the range is nearly infinite. However, time_t is not required to be represented as the number of seconds since 1970; some systems use different epoch values, or may use different representations entirely.


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