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It should be on your window sticker. Bottom center, there is a box that has a caption starting with "This label is affixed pursuant to the Federal..."
There is a printed string of letters and numbers there. the last 6 numbers, split into pairs, should represent the month, day, and year of your build. HTH
That date on the sticker is not the build date. That date is the day that the invoice was generated and the truck was scheduled to be built. It is usually about a week prior to the actual build date. My truck was built on 9/28 and the date on my sticker is 9/21.