The problem with all this is that mktime is supposed to be the inverse of localtime, if it was the inverse of gmtime, or if it had a zone parameter, then this kind of thing could be made to work. But then mktime would be useless for more common functions, especially that of hiding the timezone & dst rules from the application.

Thank you for stating it so well. That is why we NEED the tm_tzadj member added to the tm structure. Ron Tolley