Good Day!

Can anyone tell whether it is possible to list the date not found in a database. For example my data entry is 1/01/03, 1/04/03, 1/07/03, 1/12/03, 1/13/03 and 1/15/03 and i want to know the dates between 1/03/03 to 1/20/03 not in the database. any kind of help is really appreciated. thanks in advance