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TIME(3) Library Functions Manual TIME(3)

get time of day

#include <time.h>
time(time_t *tloc);

The time() function returns the value of time in seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal Time (UTC).
A copy of the time value may be saved to the area indicated by the pointer tloc. If tloc is a null pointer, no value is stored.

Upon successful completion, time() returns the value of time. Otherwise a value of (time_t)-1 is returned and the global variable errno is set to indicate the error.

The following error codes may be set in errno:
An argument address referenced invalid memory.

clock_gettime(2), gettimeofday(2), ctime(3)

A time() system call first appeared in Version 1 AT&T UNIX and used to return time in sixtieths of a second in 32 bits, which was to guarantee a crisis every 2.26 years. Since Version 6 AT&T UNIX, time() scale was changed to seconds, extending the pre-crisis stagnation period up to a total of 68 years.
January 29, 2015 OpenBSD-current