noun
date of issuance
Used on official documents such as licenses, passports, and certificates to indicate the date they were issued.
パスポートの交付年月日を確認してください。
Please check the date of issuance on your passport.
運転免許証には交付年月日が記載されている。
The driver's license shows the date of issuance.
発行日 is a more general term for 'issue date' of publications, tickets, or cards, while 交付年月日 is specifically used for official documents issued by authorities.
Compound of 交付 (こうふ, 'issuance') + 年月日 (ねんがっぴ, 'year, month, day').