How to Fix Error 6000: Invalid Date Month in Your Seller Central Feeds
Error 6000 is raised when a feed contains an impossible calendar date such as 06/31/2024 or 02/29/2023. A single invalid date can reject a 5,000‑row inventory file, halting all product, inventory, and price updates until the date is corrected.
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
- 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”.
- 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.
- Error code is attached to the offending row — The platform tags the row with Error 6000 and records the exact field that failed.
Analysis & Recommendations
Why This Matters
When Error 6000 occurs, Amazon rejects the whole batch, delaying product visibility and inventory accuracy—especially costly during peak shopping periods. Sellers lose hours fixing the issue and risk stock‑outs or price mismatches that can affect sales.
Key Takeaways
- Error 6000 triggers on any day number beyond the month’s length (e.g., 04/31/2025, 09/31/2025).
- April, June, September, and November have only 30 days; February allows 28 or 29 days depending on leap year.
- A single bad date can cause rejection of an entire 5,000‑row feed, preventing all rows from being applied.
- Fixes include locating the row, replacing the invalid date with a valid one, and re‑uploading; bulk validation can use Excel’s =IFERROR(DATE(...)) ...
Recommended Actions
- →Open Seller Central > Reports > Feed Processing Report, find the row and field flagged with Error 6000.
- →In Excel, apply =IFERROR(DATE(YEAR(A2),MONTH(A2),DAY(A2)),"INVALID") to the date column, correct each invalid entry to the last valid day of the mo...
- →Re‑upload the corrected file via Seller Central > Inventory > Add Products via Upload and confirm the new report shows no Error 6000.
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