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Command: time | Section: 3 | Source: OpenBSD | File: time.3
TIME(3) FreeBSD Library Functions Manual TIME(3)
NAME
time - get time of day
SYNOPSIS
#include <time.h>
time_t
time(time_t *now);
DESCRIPTION
The time() function returns the number of seconds elapsed since Jan 1
1970 00:00:00 UTC. This value is also written to now unless now is NULL.
RETURN VALUES
The time() function is always successful, and no return value is reserved
to indicate an error.
SEE ALSO
clock_gettime(2), gettimeofday(2), ctime(3)
STANDARDS
The time() function conforms to IEEE Std 1003.1-2008 ("POSIX.1").
HISTORY
A time() system call first appeared in Version 1 AT&T UNIX. That version
counted time in sixtieths of a second with a 32-bit return value,
ensuring an integer overflow crisis every 2.26 years. In Version 6 AT&T
UNIX the granularity of the return value was reduced to whole seconds,
delaying the aforementioned crisis until 2038. In 4.1cBSD the function
was moved out of the kernel into the C standard library and reimplemented
with gettimeofday(2).
FreeBSD 14.1-RELEASE-p8 December 11, 2021 FreeBSD 14.1-RELEASE-p8