date limit Java calendar GUI

[cuti]

Hi guys,
I'm creating a calendar in java GUI for a task manage program as follow:

import java.awt.*;
import java.awt.event.*;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.swing.*;

public class DatePicker {
	int month = java.util.Calendar.getInstance().get(java.util.Calendar.MONTH);
	int year = java.util.Calendar.getInstance().get(java.util.Calendar.YEAR);;
	JLabel l = new JLabel("", JLabel.CENTER);
	String day = "";
	JDialog d;
	JButton[] button = new JButton[49];

	/**
	 * Create a calendar to select a date.
	 * 
	 */
	public DatePicker(JFrame parent) {
		d = new JDialog();
		d.setModal(true);
		String[] header = { "Sun", "Mon", "Tue", "Wed", "Thur", "Fri", "Sat" };
		JPanel p1 = new JPanel(new GridLayout(7, 7));
		p1.setPreferredSize(new Dimension(430, 120));

		for (int x = 0; x < button.length; x++) {
			final int selection = x;
			button[x] = new JButton();
			button[x].setFocusPainted(false);
			button[x].setBackground(Color.white);
			if (x > 6) {
				button[x].addActionListener(new ActionListener() {
					public void actionPerformed(ActionEvent ae) {
						day = button[selection].getActionCommand();
						d.dispose();
					}
				});

			}
			if (x < 7) {
				button[x].setText(header[x]);
				button[x].setForeground(Color.red);
			}
			p1.add(button[x]);

		}

		JPanel p2 = new JPanel(new GridLayout(1, 3));
		JButton previous = new JButton("<< Previous");
		previous.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				month--;
				displayDate();
			}
		});
		p2.add(previous);
		p2.add(l);
		JButton next = new JButton("Next >>");
		next.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				month++;
				displayDate();
			}
		});
		p2.add(next);
		d.add(p1, BorderLayout.CENTER);
		d.add(p2, BorderLayout.SOUTH);
		d.pack();
		d.setLocationRelativeTo(parent);
		displayDate();
		d.setVisible(true);
	}

	/**
	 * Display the dates
	 * 
	 * @return void
	 */
	public void displayDate() {
		for (int x = 7; x < button.length; x++)
			button[x].setText("");
		java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(
				"MMMM yyyy");
		java.util.Calendar cal = java.util.Calendar.getInstance();
		cal.set(year, month, 1);
		int dayOfWeek = cal.get(java.util.Calendar.DAY_OF_WEEK);
		int daysInMonth = cal.getActualMaximum(java.util.Calendar.DAY_OF_MONTH);
		for (int x = 6 + dayOfWeek, day = 1; day <= daysInMonth; x++, day++) {
			button[x].setText("" + day);
			l.setText(sdf.format(cal.getTime()));
			d.setTitle("Date Picker");
			[COLOR="#FF0000"]for (int y = 7; y < button.length; y++) {
				String str = button[x].getText();
				int m = Integer.parseInt(str);
				SimpleDateFormat fm = new SimpleDateFormat("MMMM yyyy");
				String dfm = fm.format(new Date());
				SimpleDateFormat format = new SimpleDateFormat("dd");
				String date = format.format(new Date());

				int n = Integer.parseInt(date);
				if ((m < n) && (dfm.equals(l.getText())))
					button[x].setEnabled(false);

			}[/COLOR]
		}
	}

	/**
	 * Set the selected date to the Task Time area.
	 * 
	 * @return a String of date and time
	 */

	public String setPickedDate() {
		if (day.equals(""))
			return day;
		java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(
				"  dd/MM/yyyy   hh:mm:ss");
		java.util.Calendar cal = java.util.Calendar.getInstance();
		cal.set(year, month, Integer.parseInt(day));
		return sdf.format(cal.getTime());
	}
}

I want to restrict the date that user can select, which means they cannot seclect date before today. The code in red is the part I did in order to achieve it. However, when i run the code with the main app, it disabled the same dates in every month. How can I improve it?????
Thank you very much and sorry about my English its not very good.

[Norm]

Do you have code for testing the above?

[Norm]

Please use code tags when posting code.

What is the code you posted supposed to do?
How/where is the Cal class's constructor called?

[cuti]

Do you have code for testing the above?

import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;


public class cal extends JFrame {

	private JPanel contentPane;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		 
		 JLabel label = new JLabel("Selected Date:");
         final JTextField text = new JTextField(20);
         JButton b = new JButton("popup");
         JPanel p = new JPanel();
         p.add(label);
         p.add(text);
         p.add(b);
         
         final JFrame f = new JFrame();
         f.getContentPane().add(p);
         f.pack();
         f.setVisible(true);
         b.addActionListener(new ActionListener() {
                 public void actionPerformed(ActionEvent ae) {
                         text.setText(new DatePicker(f).setPickedDate());
                 }
         });
	}

	/**
	 * Create the frame to select a date.
	 */
	public cal() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		contentPane.setLayout(new BorderLayout(0, 0));
		setContentPane(contentPane);
	}

}

Here you go thanks for ur attention

[Norm]

Add some printlns in the code where the decision is made to disable a button. Print out all the values used there.
The printout should show you what the problem is.