Bridgestone date code

Does anyone know how to date Bridgestone tires? I bought some spare wheels with Bridgestone Potenza RE910's that look good but may be fairly old. Just trying to figure out the manufacturing date on them.

Thanks Don

Look here

scottgib wrote: Look here

This may be easier to understand. It is for retreads but the date codes are the same.

http://www.tpub.com/content/constructionmisc/TM-9-2610-200-14/css/TM-9-2610-200-14_38.htm

Here Is something else I did not know

They mark the lightest point of the tire on the bead and it is to be aligned with the valve stem. I have actually seen these marks I just never paid any attention to them.

http://www.tpub.com/content/constructionmisc/TM-9-2610-200-14/css/TM-9-2610-200-14_39.htm

Thanks, this is what I was looking for.