PEPPOL-EN16931-F001

Validation message

A date MUST be formatted YYYY-MM-DD.

Explanation

All dates in a PEPPOL invoice must follow ISO 8601 format YYYY-MM-DD — e.g., 2026-04-10.

How to fix

Convert the date to YYYY-MM-DD format. (Typically a software-side issue, not user input — raise this with your invoicing software vendor; if you're receiving the invoice, ask the sender to address it with theirs.)

Applies to