C in a Nutshell

Name

difftime

Synopsis

Calculates the difference between two arithmetic time values

#include <time.h>
doubledifftime( time_t time2, time_t time1 );

The difftime() function returns the difference between two time values, time2 − time1, as a number of seconds. While difftime() has the return type double, its arguments have the type time_t. The time_t type is usually, but not necessarily, defined as an integer type such as long or unsigned long.

A common way to obtain the argument values passed to difftime() is by successive calls to the time() function, which returns the current time as a single arithmetic value.

Example

See the sample program for clock() in this chapter.

See Also

asctime(), ctime(), gmtime(), localtime(), mktime(), strftime(), time()