Уведомление по заданному времени

public class MyService extends Service {
  NotificationManager nm;
  
  @Override
  public void onCreate() {
    super.onCreate();
    nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
  }
 
  public int onStartCommand(Intent intent, int flags, int startId) {
    sendNotif();
    return super.onStartCommand(intent, flags, startId);
  }
  
  void sendNotif() {
    Notification notif = new Notification(R.drawable.ic_launcher, "Text in status bar", 
      System.currentTimeMillis());
    
    Intent intent = new Intent(this, MainActivity.class);
    intent.putExtra(MainActivity.FILE_NAME, "somefile");
    PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent, 0);
    AlarmManager alarm = (AlarmManager)getSystemService(ALARM_SERVICE);
    Calendar cal = Calendar.getInstance();
 
    cal.set(Calendar.MONTH, November);
    cal.set(Calendar.DAY_OF_MONTH, 19);
    cal.set(Calendar.HOUR_OF_DAY, 20);
    cal.set(Calendar.MINUTE, 15);
    cal.set(Calendar.SECOND, 10);
     
    notif.setLatestEventInfo(this, "Notification's title", "Notification's text", pIntent);
    
    notif.flags |= Notification.FLAG_AUTO_CANCEL;
    notif.defaults = Notification.DEFAULT_ALL;   
    nm.notify(1, notif);
 
 alarm.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pIntent);
  }
  
  public IBinder onBind(Intent arg0) {
    return null;
  }
}