Screen Off time calculation

Hello everyone…
I’m developing apps using thunkable classic for more than a year. Now, I’m interested building cross platform application.

My plan is to create an app that keeps track the SCREEN OFF time each day. Is there any possible extension for that ? If not, can anyone please suggest me how can I calculate that time ?

Thanks in advance.

There have been several recent topics about this.

See this one: Keep Timer running even (1) the app screen is off or (2) the app it is closed or (3) in background

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