Overview

Amazon has added a new lastUpdatedDate attribute to five core Vendor Reports as of May 2024. The field records the exact day the underlying data set was refreshed, using the ISO 8601 format YYYY‑MM‑DD. Sellers who automate data pulls should incorporate this timestamp to guarantee they are working with the most recent metrics.

Key Points

• Report coverage — The attribute now appears in GET_VENDOR_SALES_REPORT, GET_VENDOR_NET_PURE_PRODUCT_MARGIN_REPORT, GET_VENDOR_TRAFFIC_REPORT, GET_VENDOR_FORECASTING_REPORT, and GET_VENDOR_INVENTORY_REPORT. For instance, a vendor requesting the sales report on 2024‑05‑20 will see a lastUpdatedDate value of 2024‑05‑19 if Amazon refreshed the data the previous day.
• ISO‑8601 format — Dates are delivered strictly as YYYY‑MM‑DD, removing any ambiguity caused by time‑zone conversions. A value of 2024‑04‑30 unambiguously indicates that the report reflects data through the end of April, no matter where the seller’s systems are located.
• Built‑in freshness check — The timestamp acts as a ready‑made indicator of data recency. If a daily pipeline expects a report dated 2024‑05‑20 but receives a lastUpdatedDate of 2024‑05‑18, the system can automatically flag the lag and decide whether to retry or pause processing.
• No breaking changes — All existing fields and JSON structures remain identical, so parsers that previously ignored unknown keys will continue to operate. The only addition is a top‑level key that can be read with a single extra line of code.
• Automation‑friendly — Scheduled jobs can now verify that the most recent file has been downloaded before triggering downstream calculations such as inventory replenishment, margin analysis, or demand forecasting.
• Audit‑ready logging — Because the date is part of the payload, it can be recorded alongside the file name in logs, creating a traceable record of which data version informed each business decision.

How the lastUpdatedDate Field Works

1. Request the Vendor Report — A seller issues a GET request to the appropriate endpoint (e.g., GET_VENDOR_SALES_REPORT) using the standard AWS authentication flow. The response returns the complete JSON payload plus a new top‑level property named .