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signed time_t values stop working after 2038-01-19 03:14:07 UTC, so
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new implementations these days typically use a signed 64-bit integer.
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Unsigned 32-bit integers are used on one or two platforms,
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Although earlier POSIX versions allowed time_t to be a
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floating-point type, this was not supported by any practical
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systems, and POSIX.1-2013 and the tz code both require time_t