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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

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];

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);
}

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);//1
int dayOfWeek = cal.get(java.util.Calendar.DAY_OF_WEEK);//2
int daysInMonth = cal.getActualMaximum(java.util.Calendar.DAY_OF_MONTH);//3
for (int x = 6 + dayOfWeek, day = 1; day <= daysInMonth; x++, day++) //4
button[x].setText("" + day);//5
l.setText(sdf.format(cal.getTime()));//6
d.setTitle("Date Picker");
}

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

class Picker {
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());
}
});
}
}
 
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