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Showing content from https://en.cppreference.com/w/cpp/language/../../cpp/../cpp/../cpp/../cpp/../c/chrono/time_t.html below:

time_t - cppreference.com

typedef /* unspecified */ time_t;

Real arithmetic 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.

The standard uses the term calendar time when referring to a value of type time_t.

Show the start of the epoch.

#include <stdio.h>
#include <time.h>
#include <stdint.h>
 
int main(void)
{
    time_t epoch = 0;
    printf("%jd seconds since the epoch began\n", (intmax_t)epoch);
    printf("%s", asctime(gmtime(&epoch)));
}

Possible output:

0 seconds since the epoch began
Thu Jan  1 00:00:00 1970

• C17 standard (ISO/IEC 9899:2018):

• 7.27.1/3 Components of time (p: 284)

• C11 standard (ISO/IEC 9899:2011):

• 7.27.1/3 Components of time (p: 388)

• C99 standard (ISO/IEC 9899:1999):

• 7.23.1/3 Components of time (p: 338)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.12.1 Components of time

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