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You are here: manpages





TIME

Section: Linux Programmer's Manual (2)
Updated: 2011-09-09
Index Return to Main Contents
 

NAME

time - get time in seconds  

SYNOPSIS

#include <time.h>

time_t time(time_t *t);  

DESCRIPTION

time() returns the time as the number of seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC).

If t is non-NULL, the return value is also stored in the memory pointed to by t.  

RETURN VALUE

On success, the value of time in seconds since the Epoch is returned. On error, ((time_t) -1) is returned, and errno is set appropriately.  

ERRORS

EFAULT
t points outside your accessible address space.
 

CONFORMING TO

SVr4, 4.3BSD, C89, C99, POSIX.1-2001. POSIX does not specify any error conditions.  

NOTES

POSIX.1 defines seconds since the Epoch using a formula that approximates the number of seconds between a specified time and the Epoch. This formula takes account of the facts that all years that are evenly divisible by 4 are leap years, but years that are evenly divisible by 100 are not leap years unless they are also evenly divisible by 400, in which case they are leap years. This value is not the same as the actual number of seconds between the time and the Epoch, because of leap seconds and because system clocks are not required to be synchronized to a standard reference. The intention is that the interpretation of seconds since the Epoch values be consistent; see POSIX.1-2008 Rationale A.4.15 for further rationale.  

SEE ALSO

date(1), gettimeofday(2), ctime(3), ftime(3), time(7)  

COLOPHON

This page is part of release 3.81 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
NOTES
SEE ALSO
COLOPHON


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