Android : Notification show when I kill app in background

I create a notificaion but my app show notification everytime in the precise moment i kill the app in background after the time I have set, for example if I set time to 4 pm, the notification will be show at 4pm, after 4pm if I kill the app the notification pop up, how I can fix this problem? Please help me I try everything :(

ScarsdaleHome.java

public class ScarsdaleHome extends Fragment implements OnClickListener{
Database d;
private AlarmManager alarmManager;
private PendingIntent pendingIntent;

    public ScarsdaleHome() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.scarsdale_home_activity, container, false);
        d=new Database(getActivity());
        String dataString=d.checkDataString();
        int start = dataString.indexOf("/");
        String dayString = dataString.substring(0,start);
        String monthString = dataString.substring(start + 1,start+3);
        String yearString = dataString.substring(start+4);
        int day = Integer.parseInt(dayString);
        int month = Integer.parseInt(monthString);
        int year = Integer.parseInt(yearString);

        Calendar calend = Calendar.getInstance();
        calend.set(Calendar.DAY_OF_MONTH,day);
        calend.set(Calendar.MONTH,month-1);
        calend.set(Calendar.YEAR,year);
        calend.set(Calendar.HOUR_OF_DAY, 15);
        calend.set(Calendar.MINUTE, 25);
        calend.set(Calendar.SECOND, 0);    

        Intent myIntent = new Intent(getActivity(), MyReceiver.class);
        if(PendingIntent.getBroadcast(getActivity(), 0, 
                myIntent, 
                PendingIntent.FLAG_NO_CREATE) == null){

pendingIntent = PendingIntent.getBroadcast(getActivity(), 0, myIntent,0);
alarmManager = (AlarmManager)getActivity().getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calend.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);

}

        return rootView;
    }



    public static ScarsdaleHome newIstance(){
        ScarsdaleHome frag= new ScarsdaleHome();
        return frag;
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

    }
}

MyReceiver.java

public class MyReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent)
{

     Toast.makeText(context, "Date changed", Toast.LENGTH_SHORT).show();

     Intent service1 = new Intent(context, MyAlarmService.class);
     context.startService(service1);

}   

}

MyAlarmService.java

public class MyAlarmService extends Service 
{

   private NotificationManager mManager;

    @Override
    public IBinder onBind(Intent arg0)
    {
       // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() 
    {
       // TODO Auto-generated method stub  
       super.onCreate();
    }

   @SuppressWarnings({ "static-access", "deprecation" })
   @Override
   public void onStart(Intent intent, int startId)
   {
       super.onStart(intent, startId);

       mManager = (NotificationManager) this.getApplicationContext().getSystemService(this.getApplicationContext().NOTIFICATION_SERVICE);
       Intent intent1 = new Intent(this.getApplicationContext(),ScarsdaleHome.class);

       Notification notification = new Notification(R.drawable.ic_launcher,"This is a test message!", System.currentTimeMillis());
       intent1.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP| Intent.FLAG_ACTIVITY_CLEAR_TOP);

       PendingIntent pendingNotificationIntent = PendingIntent.getActivity( this.getApplicationContext(),0, intent1,PendingIntent.FLAG_UPDATE_CURRENT);
       notification.flags |= Notification.FLAG_AUTO_CANCEL;
       notification.setLatestEventInfo(this.getApplicationContext(), "AlarmManagerDemo", "This is a test message!", pendingNotificationIntent);

       mManager.notify(0, notification);
    }

    @Override
    public void onDestroy() 
    {
        // TODO Auto-generated method stub
        super.onDestroy();
    }

}