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updatedAt: 2026-04-12T09:21:12.000Z
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# Item spec 5.0 version update

**Spec 5.0 version update (5.0.20250121-19\_24\_23)**

To download a copy of the latest 5.0 item spec or review a comprehensive list of all the minor and major changes, refer to the [Item spec reporting and version table](/us-marketplace/docs/item-spec-versioning-and-diff-reporting).

**Inventory Availability Date attribute updates**

The Inventory Availability Date attribute format has been updated from `date-time` to `date`. Sellers should specify the inventory availability date in the yyyy-mm-dd format and no longer provide Date-Time as they have done in the past. To learn more, refer to the [Help article](/us-marketplace/docs/post-item-setup-by-product-type-feed-file-structure-overview).

**Lag time configuration updates**

Sellers can now select up to 9 days of fulfillment lag time during item maintenance. This new feature expands the previous range, which was limited to 0 to 1 day, and provides sellers with the added flexibility to edit lag time during item maintenance. To learn more, refer to the [Help article](/us-marketplace/docs/post-item-setup-by-product-type-feed-file-structure-overview).