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`difftime'--subtract two times
double difftime(time_t TIM1, time_t TIM2);
Subtracts the two times in the arguments: ``TIM1 - TIM2''.
The difference (in seconds) between TIM2 and TIM1, as a `double'.
ANSI C requires `difftime', and defines its result to be in seconds in
`difftime' requires no supporting OS subroutines.
Created Mon Nov 8 17:42:54 2004 on tillpc with info_to_html version 0.9.6.