Why your Costco milk is lasting longer than what the expiration date says

Don’t have a cow: Your Costco’s Kirkland-brand milk might last way longer than expected.

Customers of the big-box store are discovering that its milk consistently lasts well beyond its expiration date and trying to figure out why. A resurfaced Reddit forum shows users in agreement that their milk doesn’t spoil as quickly, sometimes even being good a week after its expiration date.