First, the big secret: sell by dates are not expiration dates. They are a suggestion for the store, not a death sentence for your bread. The store uses it to manage stock. You, the bread owner, have way more power than you think.
Think of it like a birthday. The bread isn't suddenly "old" at midnight. It just starts a slow, gentle journey into maturity. That bag is still perfectly good for days or even a week after that date. It just needs a little love.