Meteor Countdown Timer (Newbie)

I am looking to implement a countdown timer or use any available package with good example and easy to follow packaged implementation. The ones available are not properly documented. In my app, I have items I want to display to the users like an auction styled app, the time left for them to perform an action. Each time are to be stored in Mongo. I haven’t used moment for this kind, but if you can point me to a meteor based Countdown timer with events after the time reaches completion. Thanks