Because the bands are different for all clubs and breeders, there is really no way to find out. The whole band idea is one I am not so sold on. The system is not standardized. You can look for a year of hatch, *sometimes it's there* but usually it's just a string of numbers that mean nothing to the average person.
For example some of the band numbers on my birds are: 11565 and another is 08964. certainly those are not dates. My guess is they are hatch numbers, and breeder club number, but who can be sure???!!!???
Again, the whole band idea needs to be standardized, or really it is of no use to anyone but the person banding them.