ANSI standard for difftime()

[Doug Gwyn]

In article <4400002 at tdpvax> scott at tdpvax.UUCP writes:
>double difftime(time_t time2, time_t time1);
>and it returns time2 - time1.
>My question is can this value be negative?  Since elapsed time is normally
>a positive value.

The proposed Standard does not talk about "elapsed time".  difftime()
computes the difference between two calendar times.  Obviously the
difference can be negative.