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I could be completely ignorant, but I don’t think I have ever seen two use dates on foods in the US before.
The eggs I buy in the UK have both a display date (for the shop) and a best before date (for the consumer). They’re a week different. The best before date is probably around 28 days after the egg was laid.
What? An item wouldn’t have both dates. But almost everything has at least one.
The article does seem to suggest two would be in use.