Android alarm manager with flexible schedule? - Stack Overflow
android studio - How to use Alarm Manger Class for notifcation about an event on specific date and time? - Stack Overflow
Alarm Clock with Notifications in Android Studio using Java - Alarm Manager Easy 4 Steps Only - Android Knowledge
GitHub - alberto234/schedule-alarm-manager: Android and iOS library to manage alarms based on schedules, e.g., On between 9 AM an 5 PM daily. Everyday at 9 AM an "on" alarm will trigger, and
How to get Notification at a particular time with alarm manager in android studio | Game App Studio - YouTube