Man pages matching name datetime::format::db2 in section 3pm:

DateTime::Format::DB2.3pm.en	debian 10 / libdatetime-format-db2-perl
DateTime::Format::DB2.3pm.en	debian 11 / libdatetime-format-db2-perl
DateTime::Format::DB2.3pm.en	debian 12 / libdatetime-format-db2-perl