Hi Ronald,
Believe we may have fixed the issue through other means. Seems that if we store the date in the csv as number of days since Jan 1 1970 (unix epoch) then we can treat the date in the same way as if we had performed a decimal-date-time() on the answer to a date question. Thereby cutting out the middle man as it were. We haven't tested to be sure but the form is at least deployable now.
Alex