hibernate HQL date difference

I want to find all records which maps to object XYZ with following conditions A has date field XyzDateTime (its a time stamp) Now currentTime -xyzDateTime > 20 i want to select the record

query = session.creatQuery(Select x from XYZ where :currentTime-xyzDateTime > 20 )
query.setParameter("currentTime",new Date())

is this correct?

Can i check date difference in this way?

It's not correct. Simplest solution is like that (not the prettiest solution at all)

Date twentyDaysInFuture = new Date(Calendar.getInstance().add(Calendar.DAY_OF_MONTH, 20).getTime());

query = session.createQuery("SELECT x FROM XYZ x WHERE xyzDateTime > :endDate").setParameter("endDate", twentyDaysInFuture);