Due date
Date requested by the creditor for collection; key in SEPA direct debits.
Since EPC rulebook 9.0 (November 2016), the deadline is D-1 interbank business day (TARGET2 calendar) for every CORE collection: first (FRST), recurring (RCUR), one-off (OOFF) or final (FNAL). B2B is also D-1. Your bank may ask for the file earlier with its own cut-off time.