DIFFTIME

 

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).  

ATTRIBUTES

 

Multithreading (see pthreads(7))

The difftime() function is thread-safe.  

CONFORMING TO

SVr4, 4.3BSD, C89, C99.  

NOTES

On a POSIX system, time_t is an arithmetic type, and one could just define

#define difftime(t1,t0) (double)(t1 – t0)

when the possible overflow in the subtraction is not a concern.