public void ding() {
        AlarmManager mAlarmManger = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        //Create pending intent & register it to your alarm notifier class
        Intent intent = new Intent(this, NotificationReceiver.class);
        intent.putExtra("uur", "1e"); // if you want
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

        //set timer you want alarm to work (here I have set it to 9.00)
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, 30);
        calendar.set(Calendar.MONTH, 10);
        calendar.set(Calendar.HOUR_OF_DAY, 9);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);

        //set that timer as a RTC Wakeup to alarm manager object
        mAlarmManger.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
    }