ANSI C.

[Mark Brader]

> > difftime() accepts time_t arguments but returns a double.

> What's wrong with returning a long?
> 
> What's wrong with having a function:
> 
> long seconds(time)
> time_t time;

What's wrong is that some non-UNIX systems may wish to keep their
internal times based on an origin that is much earlier than UNIX's
start-of-1970-GMT.  Then a time in seconds-since-origin won't fit
in a long.

Mark Brader