How to know production date of Panasonic 18650 battery cells?

We are only going to check the new version because the old version are 18650 batteries from before 2009. You can check that this date code is near the negative pole as you can see in the image and is usually represented by 4 numbers. In this case we are going to check the date code of a NCR18650B Panasonic 18650 battery.

The date code of the batteries could be different in the new models.