Where it's printed
The Dior mark is short and it starts with a digit, like the 6K01 used here. Where the mark sits varies by product; the batch code guide covers where to look.
How the code is built
The first character is a digit, the last digit of the year. The second is a letter for the month. The characters after those two don't change the date.
Worked example
6K01. The 6 is 2026 and the K is October, so this was made in October 2026. The app uses 36 months for Dior, which puts the best before date at October 2029. In November 2026 that leaves about 35 months.
This example is a recent one, which is why plenty of months are left.
Variants and edge cases
The app handles the variants and edge cases for you. Some codes the rule can't date; the app says so instead of guessing.
Shelf life and the PAO symbol
The app uses 36 months for Dior. It rests on a retailer's legal notice for a single Dior product, so think of it as a rough guide, not a rule from the brand.
Once a product is open, the PAO symbol on the pack matters more, the open jar with 6M, 12M or 24M on it.
Cosmetic Checker is independent and isn’t affiliated with Dior.