Hey there,

Happy to answer this question for you:

Expiration-dated products must follow these labeling requirements.

• All ingestible products (including animal products) must be clearly labeled with an expiration date or manufacturing date. Lot numbers alone are insufficient.
• All baby food and baby formula products must have a clearly labeled expiration date.
• Any expiration date must be clearly labeled. A best-by or sell-by date is considered the equivalent of an expiration date.
• Any manufacturing date must be clearly labeled. A manufacturing date is the equivalent of a production date.
• Failure to specify the manufacturing date or expiration date on a product might cause delays in receiving your products, or it may cause products to be received as expired at the fulfillment center.
• All medical devices must have expiration dates. They must be clearly labeled using YYYY-MM-DD format.
• For products other than medical devices, acceptable date formats are:
• MM-DD-YYYY
• MM-YYYY

• Numeric date formats are preferred. However, dates with an alphabetical abbreviation for the month (for example, DD-JAN-YYYY) are also acceptable.
• All case packs, multipacks, and display boxes must have the expiration date on the box or bundle, as well as on each individual item inside the box or bundle.
• Do not conceal the original expiration date or other information on the product packaging (such as ingredients, drug facts, net contents, or distributor information).

(Emphasis mine - both formats are acceptable!)

Let me know if you have any other questions or thoughts.