The Department of Transportation requires that tire manufacturers print the manufacture date on each tire. Here is how to decode what the DOT date information on a tire means.
Locate the DOT number.
On the sidewall of the tire, locate a number that starts with DOT. It can be up to 12 digits long. The last three or four numbers are the date code.
Determine the week of manufacture.
The two numbers at the beginning of the date code are the week of the year the tire was made.