What node module i can use to implement clock process on Heroku?

Here is article about clock node process on heroku: https://devcenter.heroku.com/articles/scheduled-jobs-custom-clock-processes

However no clock process node module was mentioned there. Does anybody know clock process module for node?

I created an example as there seems to be a general lack of information on the subject: https://github.com/johnhenry/example-heroku-clock-js