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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.zinternaltools;

import com.github.lgooddatepicker.calendarpanel.CalendarPanel;
import com.github.lgooddatepicker.optionalusertools.PickerUtilities;
import java.time.LocalDate;

/**
 * CalendarSelectionEvent, An instance of this event class is passed to each registered
 * CalendarSelectionListener, each time that a date is selected in a CalendarPanel.
 */
public class CalendarSelectionEvent {

    /**
     * Constructor.
     */
    public CalendarSelectionEvent(CalendarPanel source, LocalDate newDate, LocalDate oldDate) {
        this.source = source;
        this.newDate = newDate;
        this.oldDate = oldDate;
    }

    /**
     * source, This is the calendar panel that generated the event.
     */
    private CalendarPanel source;

    /**
     * newDate, This holds the value of the new selected date.
     */
    private LocalDate newDate;

    /**
     * oldDate, This holds the value of the old selected date.
     */
    private LocalDate oldDate;

    /**
     * getSource, Returns the calendar panel that generated the event.
     */
    public CalendarPanel getSource() {
        return source;
    }

    /**
     * getNewDate, Returns the new selected date.
     */
    public LocalDate getNewDate() {
        return newDate;
    }

    /**
     * getOldDate, Returns the old selected date.
     */
    public LocalDate getOldDate() {
        return oldDate;
    }

    /**
     * isDuplicate, Returns true if the new date is the same as the old date, or if both values are
     * null. Otherwise returns false.
     */
    public boolean isDuplicate() {
        return (PickerUtilities.isSameLocalDate(newDate, oldDate));
    }

}