what exactly are you trying to do?
you can get a notification at 8 o'clock using the alarmmanager extension with notification
according to Google it is not recommended to open an app automatically at a given time, see also https://developer.android.com/guide/components/activities/background-starts
Android 10 (API level 29) and higher place restrictions on when apps can start activities when the app is running in the background. These restrictions help minimize interruptions for the user and keep the user more in control of what’s shown on their screen. In nearly all cases, apps that are in the background should display time-sensitive notifications to provide urgent information to the user instead of directly starting an activity.
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by
Taifun.