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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. 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.

See Also

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

Colophon

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