Overview

Error 6000 appears when Amazon Seller Central detects an impossible calendar date in a bulk file upload, such as February 29 in a non‑leap year. The validation stops the offending rows, forcing sellers to edit and resend the file. Fixing the issue quickly prevents unnecessary delays in inventory, pricing, or catalog updates.

Key Points

• Invalid calendar day — The error is triggered whenever a date field references a day that does not exist for the given month, for example 2025‑02‑29.
• Typical culprit — Most sellers encounter the problem by entering February 29 during a standard year, when February only has 28 days.
• Leap‑year cycle — Leap years repeat every four years; recent examples are 2020, 2024, and 2028. Any year outside this pattern has a 28‑day February.
• Other impossible dates — Dates such as April 31, June 31, or September 31 also generate Error 6000 because those months have only 30 days.
• Partial upload effect — Only rows containing the invalid date are rejected; all other rows may still process successfully, leading to fragmented uploads.

How the Error Occurs

1. File submission — The seller uploads a flat file (inventory, pricing, or catalog feed) through Seller Central’s bulk upload interface. For instance, a spreadsheet containing 5,000 SKU rows is selected and submitted.
2. System validation — Amazon’s backend parses each row and checks every date column against the Gregorian calendar. If a row lists “2023‑02‑29,” the validator flags it because 2023 is not divisible by four.
3. Error generation — The platform returns Error 6000 for each offending row, halting its processing while allowing the rest of the file to continue. The upload summary shows the number of rows rejected and the specific error code.

Context: Before vs. After Validation Fixes

• Before: A seller uploads a monthly inventory file on March 1, 2025, with a promotional start date set to “2025‑02‑29.” The system rejects 120 rows, and the seller must manually locate the bad dates, delaying the promotion launch.