Find out how much time has passed after closing the game

Is there a possible way to find out how much time has passed between closing and reopening and for me to do the necessary calculations. It's for an incremental game I'm trying to build

I think there is a plugin for that. But I surely would like to know more about that.

So up you go.

Hahaha, well, this question reminded me of one asked in another thread, so I went to go find that thread and it turns out it was yours, Ximon, and the answer in there didn't explain how to do so. Hopefully LittleStain sees this thread and is able to answer specifically how to do so, since I'm curious as well.

If closing the game is actually closing the game and not just suspending it in the background, one of these plugins by Rex will help..

Thank you so much!