There should be a lot code, too, with explanation what does it stay for (production time, production team or what is accurate.
Example: "BEST BY: JAN 21 2010AY", where JAN 21 2010 = Shelf Life, A = Shift, Y = Plant. If only a single shift, then shift code does not need to appear. The code may be printed on one or two lines depending on available package printing area.