Louis Vuitton Date Code Calculator

Enter a date code.
Please enter the characters exactly as they appear inside the item.

',true);return;} // 1990–2021 format: exactly 2 letters + 4 digits if(/^[A-Z]{2}[0-9]{4}$/.test(code)){ const prefix=code.slice(0,2),digits=code.slice(2); const ft=Number(digits[0]+digits[2]),sf=Number(digits[1]+digits[3]),yy=sf; const factory=factoryText(prefix); if(yy>=90||yy<=6){ if(ft>=1&&ft<=12){ const fy=yy<=6?2000+yy:1900+yy,mn=new Date(fy,ft-1,1).toLocaleString("en-US",{month:"long"}); render(`

${code}

Production${mn} ${fy}

Format1990\u20132006 month / year

Factory Prefix${prefix}

Associated Location${factory.value}

${factory.note}

Important: A valid date code does not prove authenticity. Counterfeit items can contain copied or correctly formatted date codes. Authentication requires evaluating the item as a whole.

`); return; } } if(yy>=7&&yy<=21){ const fy=2000+yy,mw=isoWeeksInYear(fy); if(ft>=1&&ft<=mw){ render(`

${code}

ProductionWeek ${String(ft).padStart(2,"0")} of ${fy}

Format2007\u2013early 2021 week / year

Factory Prefix${prefix}

Associated Location${factory.value}

${factory.note}

Important: This result indicates a date-code pattern consistent with the stated production period. It is not an authentication result.

`); return; } render(`

${code}

Something doesn\u2019t match.
The numerical portion would indicate week ${ft} of ${fy}, but that week is outside the valid ISO-week range for that year.

Don\u2019t jump straight to \u201cfake.\u201d A worn or misread character can change the result.

`,true); return; } if(yy>=22){ render(`

${code}

The date does not fit the standard visible-code timeline.
The decoded year would be ${2000+yy}, which falls after Louis Vuitton\u2019s transition away from traditional visible date codes around 2021.

Important: This is not, by itself, an authentication determination.

`,true); return; } } // 1980s format: 3–4 digits with optional 2 letters before or after if(/^[A-Z]{2}[0-9]{3,4}$/.test(code)||/^[0-9]{3,4}[A-Z]{2}$/.test(code)||/^[0-9]{3,4}$/.test(code)||/^[A-Z]{2}[0-9]{3,4}$/.test(code)){ const letters=code.match(/[A-Z]{2}/)?.[0]||"",nums=code.replace(/[A-Z]/g,""); let year=null,month=null; if(nums.length===3){const yy=Number(nums.slice(0,2));year=(yy>=80&&yy<=89)?1900+yy:null;month=Number(nums.slice(2));} else if(nums.length===4){const yy=Number(nums.slice(0,2));year=(yy>=80&&yy<=89)?1900+yy:null;month=Number(nums.slice(2));} if(year&&month>=1&&month<=12&&year>=1980&&year<=1989){ const mn=new Date(year,month-1,1).toLocaleString("en-US",{month:"long"}),factory=letters?factoryText(letters):null; render(`

${code}

Likely Production${mn} ${year}

Era1980s historical format

${letters?`

Factory Prefix${letters}

Associated Location${factory.value}

`:""}

Historical-format notice: Early Louis Vuitton date-code systems were less standardized. Treat this as a historical reference clue rather than a definitive production determination.

Important: A date code does not prove authenticity. Older pieces should be evaluated using construction, materials, hardware, and stamping.

`); return; } } render('

We couldn\u2019t confidently decode that code.
Check that all characters were entered correctly. Standard later codes contain two letters followed by four numbers.

Need help? A worn or faint code can be difficult to interpret from text alone.

',true); } button.addEventListener("click",checkCode); input.addEventListener("keydown",function(e){if(e.key==="Enter")checkCode();}); })();