SWIFT ISO 15022 - Qualifier PROD Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Tentative Listing Date Usages Message Type Tag Name of the tag MT509 98a ( field number 18 ) Date/Time MT509 98a ( field number 18 ) Date/Time MT509 98a ( field number 18 ) Date/Time