|Create another column name DateT as a datetime field
Convert your existing date data into the DateT field
When storing date data only store the date (today) unless you need the time component (now).
If you store the time component then you cannot select on '2008-Jul-15' as the actual value may be '2008-Jul-15 04:23:11' with the time component. This will force you to use between or format whenever you use the DateT field.
SELECT TOP 100
Never underestimate the power of human stupidity