Man pages matching name datetime::format::epoch::mjd in section 3pm:

DateTime::Format::Epoch::MJD.3pm.en	debian 10 / libdatetime-format-epoch-perl
DateTime::Format::Epoch::MJD.3pm.en	debian 11 / libdatetime-format-epoch-perl
DateTime::Format::Epoch::MJD.3pm.en	debian 12 / libdatetime-format-epoch-perl