Decoder
MRE Date Code Decoder
MRE cases carry a 4-digit Julian date of pack: the first digit is the year, the last three are the day of the year. Enter the code to get the pack date and a shelf-life estimate.
- Day of year
- —
- Full Julian date
- —
- Weekday
- —
How the code works
A code like 6202 breaks down as:
| Part | Digits | Meaning |
|---|---|---|
| Year | 6 | Last digit of the year (e.g. 2016 or 2026) |
| Day of year | 202 | 202nd day → July 21 |
Because only one year digit is stamped, the decade comes from context — which is why the decoder asks you to pick it.
Shelf life depends on temperature
The pack date is your starting point; how long the MRE remains good is driven almost entirely by storage temperature:
| Storage temperature | Approx. shelf life |
|---|---|
| 50 °F (10 °C) | 5+ years |
| 70 °F (21 °C) | ~3.5 years |
| 90 °F (32 °C) | ~9 months |
| 100 °F (38 °C) | ~1 month |
Pack date ≠ expiration
MREs don't carry a true expiration date. The separately printed “inspection date” is a re-check reminder, not a use-by date. Judge an MRE by its storage history and condition.
Related
Frequently asked questions
How do I read the date code on an MRE?
Military MREs use a 4-digit Julian date for the date of pack. The first digit is the last digit of the year and the last three digits are the day of the year. For example 6202 means the 202nd day (July 21) of a year ending in 6, such as 2026. The inspection date printed separately is not the pack date.
How long do MREs last?
Shelf life depends heavily on storage temperature. Stored at about 50 °F (10 °C) an MRE can last 5 years or more; at 70 °F (21 °C) roughly 3–4 years; at 100 °F (38 °C) only about a month. The pack date tells you the starting point — count forward from there based on how it was stored.
What is the difference between the pack date and the inspection date?
The 4-digit Julian code is the date of pack — when the meal was assembled. The "inspection date" (often stamped on the case) is a future date when the lot should be re-checked for quality, not an expiration date. Neither is a hard use-by date; MREs are judged by storage conditions.
Why is the year only one digit?
To keep the code short, only the last digit of the year is stamped. That makes it ambiguous across decades — 6202 could be 2016 or 2026 — so you infer the decade from context (when you acquired the case). The decoder above lets you pick the decade.