I have looked on the ADI website (analog.com) with no success. Normally the date code is on the bottom of the chip with the part number on the top, although with chips getting smaller these days, manufacturers have resorted to codes on the top to represent the part number. They normally publish a list on their website. I cannot find it
Try submitting a query to their technical dept. it is a question they will get all the time, so they should be able to point you in the right direction: