Prompt Title: Adding Date Picker.

To add a date picker in this code, you can use the JDatePicker library which provides a nice GUI-based date picker. Here are the steps to add a date picker in this code:

1. Download the JDatePicker library jar file from the internet.
2. Import the required classes in your code:

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import org.jdatepicker.impl.JDatePanelImpl;
import org.jdatepicker.impl.JDatePickerImpl;
import org.jdatepicker.impl.SqlDateModel;

3. Create an instance of the SqlDateModel class, which is used to set the date format:

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SqlDateModel model = new SqlDateModel();

4. Create an instance of the JDatePanelImpl class and pass the SqlDateModel object to it:

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JDatePanelImpl datePanel = new JDatePanelImpl(model);

5. Create an instance of the JDatePickerImpl class and pass the JDatePanelImpl object to it:

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JDatePickerImpl datePicker = new JDatePickerImpl(datePanel);

6. Add the datePicker object to your GUI and set its position and size:

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datePicker.setBounds(350, 200, 200, 25);
b.add(datePicker);

7. To get the selected date, you can use the getValue() method of the SqlDateModel class:

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String date = model.getValue().toString();

Here is the modified code with a date picker added:

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.table.DefaultTableModel;
import java.sql.*;
import java.sql.ResultSet;
import org.jdatepicker.impl.JDatePanelImpl;
import org.jdatepicker.impl.JDatePickerImpl;
import org.jdatepicker.impl.SqlDateModel;

public class DailyPurchaseReport extends JFrame implements ActionListener
 {
    JFrame jf;
    JLabel b;
    ImageIcon img;
    JButton submit,clear;
    JLabel l1,ln;
    JTextField t1;
    Font f;
    Connection con;
    PreparedStatement ps;
    Statement stmt;
    ResultSet rs;
    DefaultTableModel model = new DefaultTableModel();
    JTable tabGrid = new JTable(model);
    JScrollPane scrlPane = new JScrollPane(tabGrid);
    SqlDateModel dateModel = new SqlDateModel();
    JDatePanelImpl datePanel = new JDatePanelImpl(dateModel);
    JDatePickerImpl datePicker = new JDatePickerImpl(datePanel);

  public DailyPurchaseReport()
  {
   jf=new JFrame();
   img=new ImageIcon("images//61804.jpg");
    b=new JLabel("",img,JLabel.CENTER);
    b.setBounds(0,0,800,600);
    jf.add(b);
    //setVisible(true);
    f = new Font("Arial",Font.BOLD,20);
    b.setLayout(null);

    ln = new JLabel("Daily purchase report");
    ln.setFont(new Font("Arial",Font.BOLD,30));
    ln.setForeground(Color.black);
    ln.setHorizontalAlignment(JLabel.CENTER);
    ln.setBounds(0,30,900,40);
    ln.setForeground(Color.black);
    b.add(ln);

    l1 = new JLabel("Enter purchase report date");
    l1.setFont(new Font("Arial",Font.BOLD,18));
    l1.setHorizontalAlignment(JLabel.CENTER);
    l1.setBounds(0,150,900,40);
    l1.setForeground(Color.black);
    b.add(l1);
    l1.setForeground(Color.black);

    datePicker.setBounds(350, 200, 200, 25);
    b.add(datePicker);

    submit = new JButton("Submit",new ImageIcon("images//open.png"));
    submit.setBounds(285,250,135,35);
    submit.setToolTipText("click to open daily purchase report");
    b.add(submit);
    submit.addActionListener(this);

    clear = new JButton