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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * ---------------
 * TimePeriod.java
 * ---------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 10-Jan-2003 : Version 1 (DG);
 * 13-Mar-2003 : Moved to com.jrefinery.data.time package (DG);
 * 27-Jan-2005 : Implemented Comparable (DG);
 *
 */

package org.jfree.data.time;

import java.util.Date;

/**
 * A period of time measured to millisecond precision using two instances of
 * java.util.Date.
 */
public interface TimePeriod extends Comparable {

    /**
     * Returns the start date/time.  This will always be on or before the
     * end date.
     *
     * @return The start date/time (never null).
     */
    public Date getStart();

    /**
     * Returns the end date/time.  This will always be on or after the
     * start date.
     *
     * @return The end date/time (never null).
     */
    public Date getEnd();

}