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Quick Answer. Yogurt can be eaten past the expiration date. An unopened container of regular plain yogurt can last two to three weeks past the expiration date. But once opened, the yogurt is only good for one week past the expiration date. Continue Reading.
However, this date is usually a 'sell by' date, as mentioned above, and yogurt most often lasts for some time after this date - usually for 2 to 3 weeks after this date. Yogurt is made from milk which is pretreated to ensure that the only bacteria left in the yogurt are not harmful, and are simply 'good bacteria'.