NAME

difftime - calculate time difference

SYNOPSIS

#include
<time.h>
double difftime(time_t time1 , time_t time0 );

DESCRIPTION

The difftime() function returns the number of seconds elapsed between time time1 and time time0, represented as a double. Each of the times is specified in calendar time, which means its value is a measurement (in seconds) relative to the Epoch, 1970-01-01 00:00:00 +0000 (UTC).

CONFORMING TO

SVr4, 4.3BSD, C89, C99.

NOTES

On a POSIX system, time_t is an arithmetic type, and one could just define when the possible overflow in the subtraction is not a concern.

SEE ALSO

date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)

COLOPHON

This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.