# PEPPOL-EN16931-F001

Source: https://xmlvalid.com/rules/PEPPOL-EN16931-F001

> A date MUST be formatted YYYY-MM-DD.

- Level: error
- Rule sets: Peppol BIS Billing 3.0 rules 3.0.21
- Context: `cbc:IssueDate | cbc:DueDate | cbc:TaxPointDate | cbc:StartDate | cbc:EndDate | cbc:ActualDeliveryDate`
- Test: `string-length(text()) = 10 and (string(.) castable as xs:date)`

Validate a document against these rules: https://xmlvalid.com/validate