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:

+-----+--------------+--------------+----------------------+
| num | startDate | endDate | reason |
+-----+--------------+--------------+----------------------+
| 2 | Sep 1, 2006 | Sep 4, 2006 | Labor Day |
| 3 | Oct 6, 2006 | Oct 10, 2006 | Fall Break |
| 5 | Nov 21, 2006 | Nov 26, 2006 | thanksgiving |
| 4 | Nov 10, 2006 | Nov 12, 2006 | veteran's day |
| 12 | Mar 5, 2007 | Mar 11, 2007 | Spring Break Week |
| 11 | Mar 2, 2007 | Mar 4, 2007 | Spring Break Weekend |
| 10 | Jan 12, 2007 | Jan 15, 2007 | MLK Weekend |
| 7 | Dec 30, 2006 | Jan 1, 2007 | new year's break |
| 6 | Dec 23, 2006 | Dec 29, 2006 | Christmas Break |
| 9 | Apr 14, 2007 | Apr 14, 2007 | Special Closing |
+-----+--------------+--------------+----------------------+