using detachcriteria & restrictions to equate date

Question

We are using detach criteria and adding restrictions to equate the date. But the problem is the date in the database column contains time as well and i just want to do some query againts the date part.

DetachedCriteria query = DetachedCriteria.For<RefundRequestedTicket>();
query.Add(Restrictions.Eq("ValidUntil", findRefundRequestedTicketsRequest.ValidUntil));

ValidUntil in database contains time and findRefundRequestedTicketsRequest.ValidUntil contains only date, this never returns me 0 count.

Is there anyway just to check the date part with detachcriteria??