The date on which a product was manufactured; the manufacturing date (the production day, distinct from best-before/expiry dates).
このお菓子の製造日は箱の底に印刷してあります。
The manufacturing date of this snack is printed on the bottom of the box.
製造日から数えて7日以内にお召し上がりください。
Please consume within seven days from the manufacturing date.
製造日が古いものは品質が落ちる可能性があるので注意してください。
Be careful: items with an older manufacturing date may have deteriorated in quality.