Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
TIME(3)			 BSD Library Functions Manual		       TIME(3)

NAME
     time -- get time of day

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <time.h>

     time_t
     time(time_t *tloc);

DESCRIPTION
     The time()	function returns the value of time in seconds since 0 hours, 0
     minutes, 0	seconds, January 1, 1970, Coordinated Universal	Time.

     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.

ERRORS
     No	errors are defined.

SEE ALSO
     gettimeofday(2), ctime(3)

STANDARDS
     The time()	function conforms to ISO/IEC 9945-1:1990 ("POSIX.1").

HISTORY
     A time() function appeared	in Version 2 AT&T UNIX.	 It returned a 32-bit
     value measuring sixtieths of a second, leading to rollover	every 2.26
     years.  In	Version	6 AT&T UNIX, the precision of time() was changed to
     seconds, allowing 135.6 years between rollovers.

     In	NetBSD 6.0 the time_t type was changed to be 64	bits wide, including
     on	32-bit machines, making	rollover a concern for the far distant future
     only.  Note however that any code making the incorrect assumption that
     time_t is the same	as long	will fail on 32-bit machines in	2038.

BSD			       November	5, 2011				   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ERRORS | SEE ALSO | STANDARDS | HISTORY

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=time&sektion=3&manpath=NetBSD+6.0>

home | help