Is this a datetime/date bug

Using v6.4  I see the following 30-year minus 1-day error:

hist=> select date_part('epoch','11/7/1998'::datetime)::date;
      date
----------
11-06-2028
(1 row)

hist=> select date_part('epoch','11/7/1998'::date)::date;
      date
----------
11-06-2028
(1 row)


mike

--
Dr Michael A. Koerber
MIT/LL
Radar Imaging Techniques