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time_t(3type) — Linux manual page

time_t(3type)time_t(3type)

NAME        top

       time_t, suseconds_t, useconds_t - integer time

LIBRARY        top

       Standard C library (libc)

SYNOPSIS        top

#include <time.h>typedef/* ... */time_t;#include <sys/types.h>typedef/* ... */suseconds_t;typedef/* ... */useconds_t;

DESCRIPTION        top

time_t Used for time in seconds.  According to POSIX, it is an              integer type.suseconds_t              Used for time in microseconds.  It is a signed integer type              capable of storing values at least in the range [-1,1000000].useconds_t              Used for time in microseconds.  It is an unsigned integer              type capable of storing values at least in the range [0,1000000].

STANDARDS        top

time_t C11, POSIX.1-2008.suseconds_tuseconds_t              POSIX.1-2008.

HISTORY        top

time_t C89, POSIX.1-2001.suseconds_tuseconds_t              POSIX.1-2001.<sched.h> definestime_t since POSIX.1-2008.       POSIX.1-2001 defineduseconds_t in<unistd.h> too.

NOTES        top

       On some architectures, the width oftime_t can be controlled with       the feature test macro_TIME_BITS.  Seefeature_test_macros(7).       The following headers also providetime_t:<sched.h>,<sys/msg.h>,<sys/select.h>,<sys/sem.h>,<sys/shm.h>,<sys/stat.h>,<sys/time.h>,<sys/types.h>, and<utime.h>.       The following headers also providesuseconds_t:<sys/select.h> and<sys/time.h>.

SEE ALSO        top

stime(2),time(2),ctime(3),difftime(3),usleep(3),timeval(3type)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17time_t(3type)

Pages that refer to this page:time(2), timespec(3type), timeval(3type), usleep(3), feature_test_macros(7)

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