Have you ever noticed that there are different color twist ties and plastic bands on bread? Bread is color coded for freshness. The color coordinates with the day is was baked and with the colored bands it is easy for store clerks to pull the loaves that are reaching their peak of staleness. Now, it will make your search for freshness easier.
Why nothing on Wednesday and Sunday? Well, bakers do need a day off every once in awhile. Keep in mind that not all bakeries are created equal. Double check the freshness date to be sure you really are getting the best loaf for your buck.