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Man Pages
TIME(3) FreeBSD Library Functions Manual TIME(3)

time
get time of day

Standard C Library (libc, -lc)

#include <time.h>
time_t
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. If an error occurs, time() returns the value (time_t)-1.
The return value is also stored in *tloc, provided that tloc is non-null.

The time() function may fail for any of the reasons described in gettimeofday(2).

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

The time function conforms to IEEE Std 1003.1-2001 (“POSIX.1”).

A time() function appeared in Version 6 AT&T UNIX.

Neither ISO/IEC 9899:1999 (“ISO C99”) nor IEEE Std 1003.1-2001 (“POSIX.1”) requires time() to set errno on failure; thus, it is impossible for an application to distinguish the valid time value -1 (representing the last UTC second of 1969) from the error return value.
Systems conforming to earlier versions of the C and POSIX standards (including older versions of FreeBSD) did not set *tloc in the error case.
July 18, 2003 FreeBSD 12.0-RELEASE

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