Do something when a user places an order

Hi All!

I am looking for a way to trigger some code when a user places order in WooCommerce. Actually what I am trying to do is to get the date when user’s order is approved/user placed the order. With that, I’ll be able to fully create my rental product system(by adding relevant time to that date, and withdraw permission to access when that day comes). I just need to know where is that Woocommerce database is triggered so that I will be able to manipulate that code.

Thanks for further help!