How to calculate a positive and negative date ?

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MainActivity extends AppCompatActivity{
   TextView textView;
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      textView = findViewById(R.id.textView);
      try {
         String CurrentDate= "07/13/2022";
         String FinalDate= "07/13/2022";
         Date date1;
         Date date2;
         SimpleDateFormat dates = new SimpleDateFormat("MM/dd/yyyy");
         date1 = dates.parse(CurrentDate);
         date2 = dates.parse(FinalDate);
         long difference = Math.abs(date1.getTime() - date2.getTime());
         long differenceDates = difference / (24 * 60 * 60 * 1000);
         String dayDifference = Long.toString(differenceDates);
         textView.setText("The difference between two dates is " + dayDifference + " days");
      } catch (Exception exception) {
         Toast.makeText(this, "Unable to find difference", Toast.LENGTH_SHORT).show();
      }
   }
}
<pre lang="Java">