The start date of the period to which the invoice applies (service period start).
Defines the beginning of the service period for subscription services, recurring invoices, or period-based billing.
Optional according to EN 16931-1.
/Invoice/cac:InvoicePeriod/cbc:StartDate/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeDelivery/ram:BillingSpecifiedPeriod/ram:StartDateTime2024-01-012024-03-012024-08-0101.01.2024✗ Invalid2024/01/01✗ Invalid2024-13-01✗ InvalidOur AI-powered Invoice Converter automatically handles all XRechnung requirements, including proper field validation.