Man pages matching name date::manip::migration5to6 in section 3pm:

Date::Manip::Migration5to6.3pm.en	debian 10 / libdate-manip-perl
Date::Manip::Migration5to6.3pm.en	debian 11 / libdate-manip-perl
Date::Manip::Migration5to6.3pm.en	debian 12 / libdate-manip-perl