Fresh cheesecake that has not been opened stays fresh in the refrigerator for five to six days past the "sell by" date. In the freezer, the dessert stays fresh for six to eight months past the printed date.
Once the cheesecake is opened, it also stays fresh in the refrigerator and freezer for five to six days or six to eight months, respectively. Homemade cheesecake also keeps for five to six days in the refrigerator and six to eight months in the freezer. All cheesecake should be kept at 40 degrees Fahrenheit or below. The cheesecake should be thrown out if the filling starts to harden and develops a brown color.