If you can show these to a quilt appraiser, they will be able to help you date the fabrics. Sometimes there is an appraiser at quilt shows, but you may have to make an appointment. Also, when the quilt is finished, it will be "dated" by the newest fabric used, not the oldest.
Put whatever info you have on the label (where you got the blocks, what you added, your name and date of completion, etc)
Enjoy!