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Java 8 Swing Date Picker. Easy to use, good looking, nice features, and localized. Uses the JSR-310 standard.
There is a newer version: 11.2.1
package com.github.lgooddatepicker.ysandbox;

import com.github.lgooddatepicker.components.CalendarPanel;
import java.util.Locale;
import com.github.lgooddatepicker.components.DatePicker;
import com.github.lgooddatepicker.components.DatePickerSettings;
import com.github.lgooddatepicker.optionalusertools.DateHighlightPolicy;
import com.github.lgooddatepicker.optionalusertools.DateVetoPolicy;
import com.github.lgooddatepicker.zinternaltools.HighlightInformation;
import java.awt.Color;
import java.awt.GraphicsEnvironment;
import java.time.DayOfWeek;
import java.time.LocalDate;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * testStart, This is a class used to test various functions while programming. This class is not
 * involved with the normal operation of the date pickers.
 */
public class TestStart {

    public static void main(String[] args) {

        ///////////////////////////////////////////////////////////////////////////////////////////
        // Create a frame, a panel, and our demo buttons.
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        frame.getContentPane().add(panel);

        DatePicker datePicker;
        DatePickerSettings dateSettings;

        // Create a CalendarPanel: With highlight policy.
        dateSettings = new DatePickerSettings();
        dateSettings.setAllowEmptyDates(false);
        dateSettings.setAllowKeyboardEditing(false);
        datePicker = new DatePicker(dateSettings);
        panel.add(datePicker);
        dateSettings.setVetoPolicy(new SampleDateVetoPolicy());
        dateSettings.setColor(DatePickerSettings.DateArea.TextFieldBackgroundValidDate, Color.green);
        dateSettings.setColor(DatePickerSettings.DateArea.TextFieldBackgroundInvalidDate, Color.blue);
        dateSettings.setColor(DatePickerSettings.DateArea.TextFieldBackgroundVetoedDate, Color.orange);
        dateSettings.setColor(DatePickerSettings.DateArea.TextFieldBackgroundDisallowedEmptyDate, Color.pink);
        /*
        datePicker = new DatePicker(dateSettings);
        panel.add(datePicker);
        
        datePicker.setDateToToday();
        datePicker.setLocale(Locale.CANADA_FRENCH);
        
        
        DatePickerSettings dateSettings2 = new DatePickerSettings(Locale.CHINESE);
        datePicker.setSettings(dateSettings2);
        
        CalendarPanel calendarPanel;
        calendarPanel = new CalendarPanel(dateSettings);
        panel.add(calendarPanel);

        calendarPanel.setSelectedDate(LocalDate.now());
        dateSettings.setLocale(Locale.CANADA_FRENCH);

        DatePickerSettings dateSettings2 = new DatePickerSettings(Locale.CHINESE);
        calendarPanel.setSettings(dateSettings2);
         */

        // Display the frame.
        frame.pack();
        frame.validate();
        int maxWidth = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width;
        int maxHeight = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height;
        frame.setSize(640, 480);
        frame.setLocation(maxWidth / 2, maxHeight / 2);
        frame.setVisible(true);
    }

    /**
     * SampleDateVetoPolicy, A veto policy is a way to disallow certain dates from being selected in
     * calendar. A vetoed date cannot be selected by using the keyboard or the mouse.
     */
    private static class SampleDateVetoPolicy implements DateVetoPolicy {

        /**
         * isDateAllowed, Return true if a date should be allowed, or false if a date should be
         * vetoed.
         */
        @Override
        public boolean isDateAllowed(LocalDate date) {
            // Disallow days 7 to 11.
            if ((date.getDayOfMonth() >= 7) && (date.getDayOfMonth() <= 11)) {
                return false;
            }
            // Disallow odd numbered saturdays.
            if ((date.getDayOfWeek() == DayOfWeek.SATURDAY) && ((date.getDayOfMonth() % 2) == 1)) {
                return false;
            }
            // Allow all other days.
            return true;
        }
    }

    /**
     * SampleHighlightPolicy, A highlight policy is a way to visually highlight certain dates in the
     * calendar. These may be holidays, or weekends, or other significant dates.
     */
    private static class SampleHighlightPolicy implements DateHighlightPolicy {

        /**
         * getHighlightInformationOrNull, Implement this function to indicate if a date should be
         * highlighted, and what highlighting details should be used for the highlighted date.
         *
         * If a date should be highlighted, then return an instance of HighlightInformation. If the
         * date should not be highlighted, then return null.
         *
         * You may (optionally) fill out the fields in the HighlightInformation class to give any
         * particular highlighted day a unique foreground color, background color, or tooltip text.
         * If the color fields are null, then the default highlighting colors will be used. If the
         * tooltip field is null (or empty), then no tooltip will be displayed.
         *
         * Dates that are passed to this function will never be null.
         */
        @Override
        public HighlightInformation getHighlightInformationOrNull(LocalDate date) {
            // Highlight a chosen date, with a tooltip and a red background color.
            if (date.getDayOfMonth() == 25) {
                return new HighlightInformation(Color.red, null, "It's the 25th!");
            }
            // Highlight all Saturdays with a unique background and foreground color.
            if (date.getDayOfWeek() == DayOfWeek.SATURDAY) {
                return new HighlightInformation(Color.orange, Color.yellow, "It's Saturday!");
            }
            // Highlight all Sundays with default colors and a tooltip.
            if (date.getDayOfWeek() == DayOfWeek.SUNDAY) {
                return new HighlightInformation(null, null, "It's Sunday!");
            }
            // All other days should not be highlighted.
            return null;
        }
    }

}