AC Delco manufactures car batteries for automobiles. The batteries come with a warranty that guarantees their operation for an amount of time after the date of manufacture. To help you figure out if your battery is still under warranty, AC Delco prints the date of manufacture on the battery.
The string of characters used to determine the date are different than the standard way of writing dates, and you will need to decipher the string to know the date.
Locate the battery in the engine compartment and determine if you can read the label on the top of the of the battery. The label might be obscured by engine oil or grease.