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NetBSD 6.1.5 - man page for time (netbsd section 3)

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 sec-
     onds, 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 mak-
     ing the incorrect assumption that time_t is the same as long will fail on 32-bit machines in
     2038.

BSD					 November 5, 2011				      BSD


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