Device clock... do processes keep running when an app is inactive?

I'm wondering if there is any way to harness the device clock to determine how much time has passed between making an app inactive and then active again.

I was able to make an app keep track of the amount of time between closing/quitting an app and opening it again, and I can certainly track time while an app is active (every 1 second, add 1 second to game.timer), but when I switch apps and come back to the app, I can't figure out a way to keep track of the time that has passed. I can't use a timer because the app isn't active (in the foreground) and when I switch back to the app, my rules don't re-trigger because they've already run.

Am I out of luck?

I tried a simple test:

Change Attribute game.deviceMinutes (real) to game.Clock.Minute
DisplayText game.deviceMinutes --> works "once" when the app is first launched but does not update again until the app has been force-quit and re-opened.
DisplayText game.Clock.Minute --> always shows the current minute of the device's internal clock

Both of those DisplayText behaviors work as I would expect in the iOS Viewer (they both update when the app is made active).

Attached is the very simple project file I used to test this after I figured out what the issue was.