How the documented Dior format is interpreted
The stored rule describes a three- or four-character structure: a year letter, a month letter, and one or two batch digits. The year alphabet excludes I and O and runs through a 24-letter cycle beginning with A for 2000, then repeating with A for 2024. The month alphabet runs from A for January through M for December while excluding I.
The supplied example is RB12: R maps to 2015, B maps to February, and 12 is the internal batch sequence. The live decoder validates both alphabets before producing a date and returns Unknown when the input does not match the documented structure.
How the repeating year cycle is resolved
The first letter repeats after 24 years. The checker resolves it to the most recent matching year that is not in the future. For contemporary bottles this usually produces one practical reading, while a vintage bottle may belong to the preceding cycle.
The result panel explains the cycle rather than hiding it. Packaging age, release history, and purchase documentation may help distinguish a vintage bottle, but ScentDecoder does not infer those clues from the batch code alone.
Where to find a Dior batch code
Inspect the bottom panel of the fragrance carton first, looking for a compact stamped, printed, or embossed group rather than the long retail barcode. Then look at the base of the bottle under indirect light. Fine marks on glass can disappear under direct glare, so tilt the bottle or place a neutral sheet behind it. Photograph the mark before typing it into the checker.
Copy every character exactly and preserve any leading zero. Pay special attention to zero versus O and one versus I. The documented format expects two letters followed by one or two digits. That pattern match is only the first gate; it does not make every short string a valid Dior batch code, and it does not establish anything about authenticity.
Sources and confidence in plain language
The Dior record cites the open Scento Perfume Batch-Code Format Dataset v1.0 and records its direct source URL and verification date. Scento is not an official Dior service, so the rule remains an independently documented decoding convention rather than a manufacturer warranty.
The on-page confidence message describes the result, not the bottle. High is reserved for an unambiguous result where a standard format and multiple sources agree. Estimated is used when the format matches but the resulting date still depends on a cycle choice. Unknown appears when the format or mapping is not available. None of those labels is an authenticity grade.
Using the date to care for a fragrance
A production estimate can help you organize purchases and decide which bottles deserve extra attention, but storage history matters more than the number alone. Keep fragrance away from sustained heat, direct sun, and repeated temperature swings. Store the bottle upright with its closure secure. If you are preserving packaging, keep the box dry and avoid adhesives or cleaning products near printed batch marks.
Do not treat the estimate as a universal expiration date. Perfumes can age differently because of formula, fill level, opening frequency, and storage. Changes in odor, color, or performance need to be considered with the history of the bottle. ScentDecoder supplies a likely production period; it does not test the liquid or decide whether it remains suitable to wear.
When bottle and box information differ
If both surfaces carry short codes, photograph each one and record where it appeared. Do not alter the input to force a match. A difference can arise for several reasons and deserves context, especially with a secondhand purchase, but the code comparison alone cannot establish that the item is genuine or counterfeit. Preserve the seller listing, receipt, and packaging photographs as separate evidence.
For an important purchase, ask the seller for sharp images before the return window closes. Look at the entire item rather than only one code: fill, closure, label placement, carton construction, and provenance may all matter to a trained evaluator. ScentDecoder intentionally stays within the narrower question of production-date decoding.
A reliable way to record your Dior result
Save the typed code, original photographs, returned month and year, confidence label, and the date on which you ran the check. Note whether the bottle was purchased new or secondhand, but keep that note separate from the decoder result. This creates an audit trail and makes it easier to revisit the estimate if the rule library gains better decade-disambiguation evidence later.
Most importantly, retain the disclaimer with the record: a batch code cannot prove authenticity. The tool is useful because it answers a limited question and shows its uncertainty. It becomes less useful when a production estimate is stretched into a guarantee about origin, condition, seller behavior, or value.