Man pages matching name datetime::locale::da_dk in section 3pm:

DateTime::Locale::da_DK.3pm.en	debian 10 / libdatetime-locale-perl
DateTime::Locale::da_DK.3pm.en	debian 11 / libdatetime-locale-perl
DateTime::Locale::da_DK.3pm.en	debian 12 / libdatetime-locale-perl