My sql query will not seem to bring back dates in the correct order. It

will brin them back in a semi-order. Here is the query and what it
brings back. Any thoughts on how to get the dates to come back in
order, formatted the way I want? Thanks.
QUERY:

select num, DATE_FORMAT(startDate,'%b %e, %Y') as startDate,
DATE_FORMAT(endDate, '%b %e, %Y') as endDate, reason from
exceptionDates order by startDate DESC, endDate DESC;

RESULTS:

+-----+--------------+--------------+----------------------+