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1 How long does unopened sour cream last after the sell-by date? 2  Sour cream will generally keep for one to two weeks after the sell-by date on the package, assuming it has been continuously refrigerated; be sure that the temperature of your refrigerator remains at or below 40Â° Fahrenheit at all times.
Look At the Date. All packages of ricotta cheese bear a use-by date. This date is the last date the manufacturer will guarantee the quality of the product and can serve as a guideline for keeping the cheese. Keep in mind that an unopened container of ricotta may stay fresh for two to four weeks, and may be good for a week or two past this date. However, if the date has long since come and gone, it's a safe bet that the cheese is no longer good.