difftime—subtract two times #include <time.h>
double difftime(time_t tim1, time_t tim2);
Description
Subtracts the two times in the arguments: `tim1 - tim2'.
Returns
The difference (in seconds) between tim2 and tim1, as a double.
Portability
ANSI C requires difftime, and defines its result to be in seconds
in all implementations.
difftime requires no supporting OS subroutines.