How to calculate the difference between two JDateChooser value in Java Swing?

 

GUI

package Trial;

import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextField;

import com.toedter.calendar.JDateChooser;

class Demo {

	JButton jb1;
	JDateChooser c1,c2;
	JTextField noofdaystxt;
	JButton btn;

	Demo() {
		JFrame frame = new JFrame();
		frame.setTitle("Hancie e-Learning Studio");
		frame.setLayout(null);
		frame.setSize(600, 500);
		frame.setLocationRelativeTo(null);

		c1 = new JDateChooser();
		c1.setDateFormatString("yyyy-MM-dd");
		c1.setBounds(160, 10, 210, 35);
		c1.setBorder(BorderFactory.createLineBorder(Color.white, 1));
		c1.setFont(new Font("Verdana", Font.PLAIN, 18));
		frame.add(c1);
		
				
		c2 = new JDateChooser();
		c2.setDateFormatString("yyyy-MM-dd");
		c2.setBounds(160, 60, 210, 35);
		c2.setBorder(BorderFactory.createLineBorder(Color.white, 1));
		c2.setFont(new Font("Verdana", Font.PLAIN, 18));
		frame.add(c2);
		
		noofdaystxt = new JTextField();
		noofdaystxt.setBounds(160, 140, 210, 35);
		noofdaystxt.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(noofdaystxt);
		
		btn = new JButton("Calculate");
		btn.setBounds(160, 200, 210, 35);
		btn.setBorder(BorderFactory.createLineBorder(Color.white, 1));
		btn.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(btn);
		btn.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				
				try {
					
					String fromdate = ((JTextField) c1.getDateEditor().getUiComponent()).getText();
					String todate = ((JTextField) c2.getDateEditor().getUiComponent()).getText();

					LocalDate fday = LocalDate.parse(fromdate);
					LocalDate tday = LocalDate.parse(todate);
					
					Long day_gap = ChronoUnit.DAYS.between(fday, tday);
					noofdaystxt.setText(String.valueOf(day_gap));
					
				}
				
				catch(Exception ex) {
					System.out.println("Error"+ex.getMessage());
				}
			}
			
			
			
		});
		
		
		
		
		frame.setVisible(true);

	}

	public static void main(String args[]) {
		new Demo();
	}
}

Output