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Java 8 Swing Date Picker. Easy to use, good looking, nice features, and localized. Uses the JSR-310 standard.
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package com.github.lgooddatepicker.components;

import java.beans.BeanDescriptor;
import java.beans.BeanInfo;
import java.beans.EventSetDescriptor;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.MethodDescriptor;
import java.beans.PropertyDescriptor;
import java.beans.SimpleBeanInfo;
import java.awt.Image;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import static java.beans.BeanInfo.ICON_COLOR_16x16;
import static java.beans.BeanInfo.ICON_COLOR_32x32;
import static java.beans.BeanInfo.ICON_MONO_16x16;
import static java.beans.BeanInfo.ICON_MONO_32x32;
import com.github.lgooddatepicker.zinternaltools.Pair;

/**
 * DatePickerBeanInfo, This class returns JavaBean information for the matching bean class.
 *
 * The class methods will return default BeanInfo Introspector information for properties, methods,
 * and events, plus any customizations that are applied on top of the default Introspector data set.
 */
public class DatePickerBeanInfo extends SimpleBeanInfo {

    ///////////////////////////////////////////////////////////////////////////////////////////////
    // Start: Custom settings.
    ///////////////////////////////////////////////////////////////////////////////////////////////
    /**
     * iconInformation, This holds all the information for the image icons. The map key is the
     * BeanInfo icon type. The pair string is the path to the matching icon resource. The pair image
     * will hold the matching icon image, if it has been loaded. (The image will be null until the
     * first time it is loaded.)
     */
    private static HashMap> iconInformation
            = new HashMap>() {
        {
            put(ICON_MONO_16x16, new Pair<>("/images/DatePickerIcon 16x16.png", null));
            put(ICON_COLOR_16x16, new Pair<>("/images/DatePickerIcon 16x16.png", null));
            put(ICON_MONO_32x32, new Pair<>("/images/DatePickerIcon 32x32.png", null));
            put(ICON_COLOR_32x32, new Pair<>("/images/DatePickerIcon 32x32.png", null));
        }
    };

    /**
     * preferredProperties, This lists all the properties that should be marked as preferred, as
     * lowercase strings. Any properties that are not in this list, will be marked as "not
     * preferred". (All of the defaults for preferred properties are overwritten.)
     */
    private static HashSet preferredProperties = new HashSet(Arrays.asList(
            "date", "text"));

    /**
     * propertyDescriptions, These are the descriptions to add to the properties. The key is the
     * property name in all lowercase. The value is the property description.
     */
    private static HashMap propertyDescriptions = new HashMap() {
        {
            put("date", "The last valid date.");
            put("text", "The date picker text.");
        }
    };

    /**
     * targetClass, This is the class for which we are providing the BeanInfo.
     */
    private static Class targetClass = DatePicker.class;

    ///////////////////////////////////////////////////////////////////////////////////////////////
    // End: Custom settings.
    ///////////////////////////////////////////////////////////////////////////////////////////////
    /**
     * zDefaultEventIndex, This holds the BeanInfo defaultEventIndex. This is initialized when the
     * class is first loaded, and not changed afterwards.
     */
    private static int zDefaultEventIndex = -1;

    /**
     * zDefaultPropertyIndex, This holds the BeanInfo defaultPropertyIndex. This is initialized when
     * the class is first loaded, and not changed afterwards.
     */
    private static int zDefaultPropertyIndex = -1;

    /**
     * zPropertyDescriptorArray, This holds the array of BeanInfo property descriptors. This is
     * initialized when the class is first loaded, and not changed afterwards.
     */
    static private PropertyDescriptor[] zPropertyDescriptorArray;

    /**
     * Static Initializer, This code is run when the class is first accessed or instantiated. This
     * initializes all the needed BeanInfo arrays.
     */
    static {
        try {
            BeanInfo info = Introspector.getBeanInfo(targetClass);
            zPropertyDescriptorArray = info.getPropertyDescriptors();
        } catch (IntrospectionException ex) {
            throw new RuntimeException(ex.getMessage());
        }
        for (PropertyDescriptor propertyDescriptor : zPropertyDescriptorArray) {
            String propertyName = propertyDescriptor.getName().toLowerCase();
            propertyDescriptor.setPreferred(preferredProperties.contains(propertyName));
            if (propertyDescriptions.containsKey(propertyName)) {
                propertyDescriptor.setShortDescription(propertyDescriptions.get(propertyName));
            }
        }
    }

    /**
     * getIcon, Returns the requested BeanInfo icon type, or null if an icon does not exist or
     * cannot be retrieved.
     */
    @Override
    public Image getIcon(int iconType) {
        Pair pair = iconInformation.get(iconType);
        String imagePath = pair.first;
        Image imageOrNull = pair.second;
        if ((imageOrNull == null) && (imagePath != null)) {
            imageOrNull = loadImage(imagePath);
        }
        return imageOrNull;
    }

    /**
     * getBeanDescriptor, Returns the BeanInfo BeanDescriptor, or null to use automatic
     * introspection.
     */
    @Override
    public BeanDescriptor getBeanDescriptor() {
        return null;
    }

    /**
     * getPropertyDescriptors, Returns the BeanInfo PropertyDescriptor array, or null to use
     * automatic introspection. Each array element may be a PropertyDescriptor, or the
     * IndexedPropertyDescriptor subclass of PropertyDescriptor.
     */
    @Override
    public PropertyDescriptor[] getPropertyDescriptors() {
        return zPropertyDescriptorArray;
    }

    /**
     * getEventSetDescriptors, Returns the BeanInfo EventSetDescriptor array, or null to use
     * automatic introspection.
     */
    @Override
    public EventSetDescriptor[] getEventSetDescriptors() {
        return null;
    }

    /**
     * getMethodDescriptors, Returns the BeanInfo MethodDescriptor array, or null to use automatic
     * introspection.
     */
    @Override
    public MethodDescriptor[] getMethodDescriptors() {
        return null;
    }

    /**
     * getDefaultPropertyIndex, Returns the BeanInfo defaultPropertyIndex, or -1 if there is no
     * default property.
     */
    @Override
    public int getDefaultPropertyIndex() {
        return zDefaultPropertyIndex;
    }

    /**
     * getDefaultEventIndex, Returns the BeanInfo defaultEventIndex, or -1 if there is no default
     * property.
     */
    @Override
    public int getDefaultEventIndex() {
        return zDefaultEventIndex;
    }

}