Man pages matching name datetime::event::cron in section 3pm:

DateTime::Event::Cron.3pm.en	debian 10 / libdatetime-event-cron-perl
DateTime::Event::Cron.3pm.en	debian 11 / libdatetime-event-cron-perl
DateTime::Event::Cron.3pm.en	debian 12 / libdatetime-event-cron-perl