difftime - calculate time difference

NAME  LIBRARY  SYNOPSIS  DESCRIPTION  ATTRIBUTES  STANDARDS  HISTORY  SEE ALSO 

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NAME

difftime − calculate time difference

LIBRARY

Standard C library (libc, −lc)

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 time is a count of seconds.

difftime(b, a) acts like (b−a) except that the result does not overflow and is rounded to double.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

STANDARDS

C11, POSIX.1-2008.

HISTORY

POSIX.1-2001, C89, SVr4, 4.3BSD.

SEE ALSO

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

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