How to use cron in ruby on rails (2.3.5). Please help?

Can anyone please guide through website links or books names or any other medium. I am pursuing a project on the same platform. There is one procedure in which I have to set the schedule certain data and such that it automatically send the data to third party on the respective scheduled dates. I have to do the whole scheduling part through cron so that sending data on the scheduled dates job done by it.
please help in this concern as I don’t have idea how to do these.