Este é o namoro padrão e seria 5 de junho de 2009. Nos EUA é bastante padrão para namoro aberto ser formatado como mês-dia-ano.
Também da Serviço de Inspeção e Segurança de Alimentos do USDA :
Does Federal Law Require Dating?
Except for infant formula, product dating is not required by Federal regulations.
For meat, poultry, and egg products under the jurisdiction of the Food Safety and Inspection Service (FSIS), dates may be voluntarily applied provided they are labeled in a manner that is truthful and not misleading and in compliance with FSIS regulations1. To comply, a calendar date must express both the month and day of the month. In the case of shelf-stable and frozen products, the year must also be displayed. Additionally, immediately adjacent to the date must be a phrase explaining the meaning of that date such as "Best if Used By."
(ênfase minha)