I ended up using an Oracle function inside the SQL in order to get a date time out. See the EXPIRE_DATE below:
string sql = @"SELECT CONTAINER_ID,
PLANT_ID,
MATERIAL_ID,
QTY_IN,
QTY_OUT,
UNIT_OF_MEASURE,
TO_CHAR (EXPIRE_DATE, 'YYYY-MON-DD HH24:MI:SS') AS MY_EXPIRE_DATE,
LOT_ID,
CONTAINER_STATUS,
CONTENTS_TYPE
FROM POMSNET.MM_CONTAINER_ST
WHERE CONTENTS_TYPE = 'Raw Material'
AND QTY_IN - QTY_OUT > 0";