Bread is delivered to the store fresh every day - the twist tie colors tell you the day it was baked. Monday = Blue Tuesday = Green Thursday =Red Friday = White Saturday =Yellow make sure you ask the store for their color code.
The Big Myth: Food Dates. Answers @EatByDate
This blog tells you how long foods really last after the printed "sell by" date. It also gives tips on how to make foods last longer and gives substitutions.