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Chili for sure. Most stews will end up better after at least a few hours of being in the fridge, but overnight is better. Soups, not so much that I've ever noticed.

I guess you can argue that pickles and fermented foods need a best after date, since they kinda do, but the truth is that the process of pickling or fermenting is the equivalent of cooking whatever it is, so I don't think it counts the same. However, most pickles and ferments do get better around a week or so after the initial process is done and they're shoved into storage.