Decode a DOT date code (WWYY or WWY) to manufacture week, year, and age. Get inspect-or-replace guidance from NHTSA-style date stamps — free, private.
After 2000: last four digits are week + year (WWYY). Older tires may show three digits.
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Paste the DOT date group from the sidewall — typically the last four digits of the TIN (WWYY, week 01–52 and year). Older three-digit WWY codes are recognized as ambiguous decade. You get manufacture week, year, and age without decoding the plant code by hand.
Age is computed from the decoded date to today. Guidance follows common safety practice: inspect more carefully around six years, plan replacement around ten — not a federal “expires on” date. Tires can fail from UV, ozone, and underinflation before the calendar says so.
Four-digit codes follow 49 CFR 574.5 dating (week + year in the 2000s). Three-digit codes cannot tell 1998 from 2008; the tool marks them ambiguous instead of inventing a decade. Plant and size codes in the rest of the DOT string are not decoded here.
No account, no photo upload, and no VIN. You can type only the date digits if you do not want to paste the full TIN. Close the tab and the code is gone. This decoder is not a NHTSA recall lookup by complete DOT plant code.
Look for DOT followed by a TIN. The date is usually the last four digits (WWYY). Some older tires use three digits.
The tool extracts the trailing 4 or 3 digits. You do not need the plant code to get week and year.
WWYY years are 2000+YY. Three-digit codes show as ambiguous decade so you do not treat them as exact age.
Calendar age is one factor. Also check cracking, inner liner, and how the tire was stored. When in doubt, a shop inspection beats the date alone.
Straight answers on privacy, limits, and how the workspace behaves.
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