Overview

On certain days Amazon Seller Central rejects feed uploads with Error 6000 because a date field contains a calendar date that does not exist. The issue typically appears when a day number exceeds the maximum for the month (for example, “June 31”). Sellers must correct the offending dates, otherwise their product, inventory, or pricing updates remain pending.

Key Points

• Error 6000 triggers on impossible calendar dates — Any feed line that lists a day beyond the month’s actual length (e.g., “04/31/2025”) generates the error.
• Four months have only 30 days — April, June, September and November cannot accept a day‑31 entry; a single “31” in any of these columns will fail validation.
• February is limited to 28 or 29 days — Non‑leap‑year entries such as “02/30/2024” are always invalid, while “02/29/2023” fails because 2023 is not a leap year.
• The error can appear in any date‑type attribute — Release dates, expiration dates, warranty start dates, and promotional start/end dates are all subject to the same check.
• Large catalogs amplify the risk — A spreadsheet with thousands of rows may hide a handful of bad dates, causing the entire batch to be rejected.
• Fixing the error is a three‑step process — Locate the bad date, replace it with a valid calendar date, and re‑upload the corrected file.

How Error 6000 Works

1. Feed ingestion begins — Amazon’s backend reads each row of the uploaded CSV or XML file and maps fields to internal data structures. Example: Row 152 contains a “release_date” value of “09/31/2025”.
2. Date validation routine runs — The system checks the month‑day combination against the Gregorian calendar, including leap‑year rules. Example: The routine flags “09/31/2025” because September has only 30 days.
3. Error code is attached to the offending row — The platform tags the row with Error 6000 and records the exact field that failed.