All tires sold in the USA have a DOT number on the side wall. At the end of the DOT number is a 4 digit date code with the first two digits indicating the week and the last two the year the tire was manufactured.
Tires built before the year 2000 used a 3 digit date code with the first two digits indicating the week and the last digit the year of manufacture.
Shown is the 27th week of 2003...(2703)...