Rohto Batch Codes: Year Digit + Month Letter (Unofficial)
Hada Labo, Melano CC, OXY and Sunplay follow an observed year-digit-plus-month-letter pattern that Rohto has never confirmed. We decode it, and we say so.
4 min read · Updated July 2026
Anatomy of the code 6C2
| Characters | What they encode |
|---|---|
6 | Last digit of the production year — 2026 |
C | Month letter: A = January … L = December, so C = March |
2 | Production line — no date information |
Worked examples
Decoded live by the same engine that powers the checker — not transcribed by hand.
6C2March 1, 2026low confidenceMarch 2026.
5H1August 1, 2025low confidenceH is the 8th letter — August 2025.
An observed pattern, not a published one
Rohto has never published a batch-code scheme. What exists is a pattern documented by the community across many products: a year digit, a month letter running A for January through L for December, then a line digit.
We decode it, and we label the result low-confidence — because it is a reading of a pattern rather than an application of a documented rule. That distinction matters more than a confident answer does.
Reading one by hand
- First character: the year's last digit.
- Second character: the month letter. A is January and L is December — all twelve letters are used, with no skips.
- The result is a month, not a day.
FAQ
Should I trust this date?
Treat it as approximate. If the product carries a printed expiry date — many Japanese products do — use that instead.
Brands that use this code (4)
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
- Coty Batch Codes (YDDD): How to Read Them
- L'Oréal Batch Codes: The Year-Letter System Explained
- Estée Lauder Batch Codes: Plant, Month, Year in 3 Characters
- Dior, Chanel and LVMH Batch Codes: The Date Is in the Code
Not sure which code on the pack is the batch code? How to Find Your Batch Code