How do I keep my game running?

Is there anyway to keep my game up and running while the app is closed?

I'm thinking about develop one of those games where the player has to accumulate trillions of points, but his points can be acquired just by waiting.

So there any way I can detect when the application is closed, or keep track of the time the application was last use, or keep it running and counting if it's closed?

Is there any way to do that?

you can use this plugin by rexrainbow