All tires have an abundance of information printed on the sidewall, but you must know how to find and interpret it. Tires have the letters DOT printed on them, followed by a series of numbers and letters indicating the manufacturing facility code, the tire size code, the manufacturer identity number, and finally, four numbers officially called the “tire identification number” (but what The Tire Mom affectionately named the “Tire Halo”) that indicate the week and year the tire was made. For instance, a Tire Halo containing “2512” means that the tire was made in the 25th week of 2012. The diagram on the next page can help you find the Tire Halo on your own tires.

It is important to note that these numbers are only printed on one side of the tire, so, depending on how your tires are mounted on the rim, you may not see this information when looking at the outward-facing sidewall of your tire—it may be printed on the sidewall of the tire that is facing the chassis of your vehicle.

If any tire on your vehicle has a manufacturing date indicating that it is more than 6 years old, it is time to think about replacing it! It is dangerous to drive on old tires.
To learn more follow  this link.