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8.4 difftime—subtract two times

Synopsis 

     #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.