time_t
From cppreference.com
Defined in header <time.h>
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typedef /* unspecified */ time_t; |
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Arithmetic (until C11) Real (since C11) type capable of representing times.
Although not defined by the C standard, this is almost always an integral value holding the number of seconds (not counting leap seconds) since 00:00, Jan 1 1970 UTC, corresponding to POSIX time.
Notes
The standard uses the term calendar time when referring to a value of type time_t.