DIFFTIME

Section: Linux Programmer's Manual (3)
Updated: 2002-02-28
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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. The two times are specified in calendar time, which represents the time elapsed since the Epoch (00:00:00 on January 1, 1970, Coordinated Universal Time (UTC)).  

CONFORMING TO

SVr4, 4.3BSD, 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. On other systems, the data type time_t might use some other encoding where subtraction doesn't work directly.  

CONFORMING TO

SVr4, 4.3BSD, POSIX.1-2001.  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
CONFORMING TO
NOTES
CONFORMING TO
SEE ALSO

linux.jgfs.net manual pages