public class MyService extends Service
{

    String dayDifference;

    NotificationManager manager;
    Notification myNotication;

    @Override
    public IBinder onBind(Intent intent)
    {
        return null;
    }//End of onBind method

    public void onStart(Intent intent, int startId)
    {
        super.onStart(intent, startId);
        manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        try {

            //Dates to compare
            String CurrentDate;
            String FinalDate=  "08/24/2016";

            Date date1 = new Date();
            Date date2;

            SimpleDateFormat dates = new SimpleDateFormat("mm/dd/yyyy");

            //Setting dates
            date1.setTime(System.currentTimeMillis());
            CurrentDate = dates.format(date1);
            date2 = dates.parse(FinalDate);
            date1 = dates.parse(CurrentDate);

            //Comparing dates
            long difference = Math.abs(date1.getTime() - date2.getTime());
            long differenceDates = difference / (24 * 60 * 60 * 1000);

            //Convert long to String
            dayDifference = Long.toString(differenceDates);

            Log.e("HERE.................", "HERE: " + dayDifference);
            System.out.println("..............difference date " + dayDifference);

            Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            Intent targetIntent = new Intent(this, Mnst.class);

            PendingIntent pendingIntent = PendingIntent.getActivity(this, 1, targetIntent, 0);
            NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

            builder.setAutoCancel(true);
            builder.setTicker("Predictor");
            builder.setContentTitle("Miisky Notification");

            builder.setContentText("You have " + dayDifference + " days left. Click on notification to know more..");
            builder.setSmallIcon(R.drawable.miilogo);
            builder.setSound(soundUri);
            builder.setContentIntent(pendingIntent);
            builder.setOngoing(true);
            //builder.setSubText("Your vault number is " + s.vault_no);   //API level 16
            builder.setNumber(100);

            builder.build();

            //noinspection deprecation
            myNotication = builder.getNotification();
            builder.setAutoCancel(true);
            manager.notify(11, myNotication);

            Toast.makeText(getApplicationContext(), " "+ dayDifference + " Days Left ", Toast.LENGTH_LONG).show();

        } catch (Exception exception) {
            Log.e("DIDN'T WORK............", "exception " + exception);
        }
    }
}