What's wrong with my code??? I have been struggling for 2 days !!!!

Hi guys, I'm working on a java swing calendar and I want to set different colour for current(today) date, here is what I have tried so far and its seems to be fine:

Code :

 
import java.awt.*;
import java.awt.event.*;
import java.text.SimpleDateFormat;
import java.util.*;
 
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");
			String str =button[x].getText();
			SimpleDateFormat format = new SimpleDateFormat("dd");
			String timenow = format.format(new Date());
			SimpleDateFormat df = new SimpleDateFormat("MMMM yyyy");
			String month = df.format(new Date());
			System.out.println(str);
			System.out.println(l.getText());
 
			if(l.getText().equals(month) &&(str.equals(timenow))) button[x].setForeground(Color.RED);
 
		}
	}
 
	/**
	 * Set the selected date to the plan 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");
		java.util.Calendar cal = java.util.Calendar.getInstance();
		cal.set(year, month, Integer.parseInt(day));
		return sdf.format(cal.getTime());
	}
}

The code I used to set the colour is in the displayDate() method. It worked for this month as the date today(21 January) is set to red. However went I go to next month the 18th of February is red as well and I have absolutely no idea why is that. I have been struggle for so long and I decided to post it here and hope some of you can find what I have done wrong.
Any comment is appreciated.