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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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/*
 * Copyright (c) 2002-2013 JGoodies Software GmbH. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  o Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  o Neither the name of JGoodies Software GmbH nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.privatejgoodies.forms.util;

import java.awt.Component;

/**
 * An interface that describes how to convert general sizes to pixel sizes. For example, dialog
 * units require a conversion that honors the font and resolution. The
 * {@link com.privatejgoodies.forms.layout.Sizes} class delegates all size conversions to an
 * implementation of this interface.
 *
 * @author Karsten Lentzsch
 * @version $Revision: 1.7 $
 * @see com.privatejgoodies.forms.layout.Sizes
 * @see com.privatejgoodies.forms.layout.ConstantSize
 * @see AbstractUnitConverter
 * @see DefaultUnitConverter
 */
public interface UnitConverter {

    /**
     * Converts Inches and returns pixels using the specified resolution.
     *
     * @param in the Inches
     * @param component the component that provides the graphics object
     * @return the given Inches as pixels
     */
    int inchAsPixel(double in, Component component);

    /**
     * Converts Millimeters and returns pixels using the resolution of the given component's
     * graphics object.
     *
     * @param mm Millimeters
     * @param component the component that provides the graphics object
     * @return the given Millimeters as pixels
     */
    int millimeterAsPixel(double mm, Component component);

    /**
     * Converts Centimeters and returns pixels using the resolution of the given component's
     * graphics object.
     *
     * @param cm Centimeters
     * @param component the component that provides the graphics object
     * @return the given Centimeters as pixels
     */
    int centimeterAsPixel(double cm, Component component);

    /**
     * Converts DTP Points and returns pixels using the resolution of the given component's graphics
     * object.
     *
     * @param pt DTP Points
     * @param component the component that provides the graphics object
     * @return the given Points as pixels
     */
    int pointAsPixel(int pt, Component component);

    /**
     * Converts horizontal dialog units and returns pixels. Honors the resolution, dialog font size,
     * platform and look&feel.
     *
     * @param dluX the horizontal dialog units
     * @param component a component that provides the font and graphics
     * @return the given horizontal dialog units as pixels
     */
    int dialogUnitXAsPixel(int dluX, Component component);

    /**
     * Converts vertical dialog units and returns pixels. Honors the resolution, dialog font size,
     * platform and look&feel.
     *
     * @param dluY the vertical dialog units
     * @param component a component that provides the font and graphics
     * @return the given vertical dialog units as pixels
     */
    int dialogUnitYAsPixel(int dluY, Component component);

}