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Expiration - This is an estimated date for when the item is expected to go bad and the consumer is expected to proceed with caution. Still, a surprisingly large amount of these can be expanded.
Sell by - That's for the retailer, not for you. It's about peak quality, like with flavor. It's for store display and, maddeningly, much of this gets tossed - prompting a "dumpster dive" revolution. Wouldn't it be nice if people didn't have to relegate themselves to a dumpster to get this perfectly good food? But in the dump it goes first.
Best if Used By/Before and Use By - Again, these refer to quality, not safety.
Pack or Born On - This is just the manufacturer's date stamp often found on canned goods and beer.
Guaranteed Fresh - This is mostly the baker's way of letting you know how long you can enjoy the baked good before it possibly goes stale. It doesn't mean it's harmful, but could be stale. Homemade is different.
It's for store display and, maddeningly, much of this gets tossed - prompting a "dumpster dive" revolution.