android - date and time not working in Alarm Manager

Question

I'm having trouble working with the AlarmManager. I want to run AlarmManager using Calendar at a specific time. But the calendar doesn't work and AlarmManager always runs regardless of the time taken from the calendar.

 AlarmManager mAlarmManger = (AlarmManager) Objects.requireNonNull(activity).getSystemService(view.getContext().ALARM_SERVICE);
 Intent intent = new Intent(activity, MyReceiver.class);
 PendingIntent pendingIntent = PendingIntent.getBroadcast(activity, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

 Calendar calendar = Calendar.getInstance();
 calendar.set(Calendar.WEEK_OF_YEAR, Calendar.MONTH , Calendar.DAY_OF_MONTH, 11, 55, 0);
 calendar.set(Calendar.AM_PM, Calendar.AM);

 if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O){

        mAlarmManger.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
    }
    else{

        mAlarmManger.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
    }

AlarmManager should run at 11:55 AM everyDay, but will run as soon as the app opens.

Answer 1

  Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 11);
        calendar.set(Calendar.MINUTE, 30);
        calendar.set(Calendar.SECOND, 0);     

if (calendar.getTimeInMillis() > System.currentTimeMillis()) {

            Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
            pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            AlarmManager am = (AlarmManager) MainActivity.this.getSystemService(MainActivity.this.ALARM_SERVICE);
            am.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 24 * 60 * 60 * 1000, pendingIntent); //Repeat every 24 h
}

Try this..