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Bioderma Batch Codes (DDDY): Day First, Year Last

Bioderma's code puts the day of the year before the year digit — the mirror image of Coty's. And most Bioderma packs print an expiry date anyway.

4 min read · Updated July 2026

Anatomy of the code 29682

CharactersWhat they encode
296Day of the year — day 296 is 23 October
8Last digit of the production year — 2018
2Internal reference

Worked examples

Decoded live by the same engine that powers the checker — not transcribed by hand.

29682October 23, 2018medium confidence

Day 296, year digit 8 — 23 October 2018.

0455February 14, 2025medium confidence

Day 045, year digit 5.

How the code is built

Bioderma, owned by NAOS, writes the day of the year first — three digits, 001 to 366 — followed by the last digit of the production year. It is the exact reverse of Coty's YDDD, and reading one with the other's rule gives a wrong answer that looks right.

Fortunately Bioderma makes the point moot on most products by printing an explicit expiry date on the pack. When a real expiry date exists, no decoding is needed and none should be trusted over it.

Reading one by hand

  • First three digits: the day of the year. Divide by about 30.4 for the month.
  • Fourth digit: the last digit of the year.
  • Then check the pack for a printed expiry date, which supersedes all of the above.

FAQ

Does micellar water go off?

It has preservatives and a long shelf life, but it is water-based, and water-based products are the ones that actually spoil. Once opened, follow the PAO symbol.

Brands that use this code (1)

The format belongs to the manufacturer, not the label on the bottle — every brand below is stamped by the same plants and reads the same way.

Other code formats

Not sure which code on the pack is the batch code? How to Find Your Batch Code