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difftime
[subtract two times]

    SYNOPSIS
    #include <time.h>
    double difftime(time_t tim1, time_t tim2);

DESCRIPTION
difftime subtracts the two times in the arguments: tim1- tim2.

RETURNS
The difference (in seconds) between tim2 and tim1,as a double.

COMPLIANCE
ANSI C requires difftime, and define its result to be in seconds in all implementations.

difftime requires no supporting OS subroutines.