diff -r 000000000000 -r fb9019fb1bf7 src/net/fortuna/ical4j/model/property/Duration.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/net/fortuna/ical4j/model/property/Duration.java	Tue Feb 10 18:12:00 2015 +0100
@@ -0,0 +1,175 @@
+/**
+ * Copyright (c) 2012, Ben Fortuna
+ * 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 Ben Fortuna nor the names of any other 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 net.fortuna.ical4j.model.property;
+
+import java.util.Date;
+
+import net.fortuna.ical4j.model.Dur;
+import net.fortuna.ical4j.model.ParameterList;
+import net.fortuna.ical4j.model.Property;
+import net.fortuna.ical4j.model.PropertyFactoryImpl;
+import net.fortuna.ical4j.model.ValidationException;
+
+/**
+ * $Id$
+ * 
+ * Created: [Apr 6, 2004]
+ *
+ * Defines a DURATION iCalendar component property.
+ * 
+ * <pre>
+ *     4.3.6   Duration
+ *     
+ *        Value Name: DURATION
+ *     
+ *        Purpose: This value type is used to identify properties that contain
+ *        a duration of time.
+ *     
+ *        Formal Definition: The value type is defined by the following
+ *        notation:
+ *     
+ *          dur-value  = ([&quot;+&quot;] / &quot;-&quot;) &quot;P&quot; (dur-date / dur-time / dur-week)
+ *     
+ *          dur-date   = dur-day [dur-time]
+ *          dur-time   = &quot;T&quot; (dur-hour / dur-minute / dur-second)
+ *          dur-week   = 1*DIGIT &quot;W&quot;
+ *          dur-hour   = 1*DIGIT &quot;H&quot; [dur-minute]
+ *          dur-minute = 1*DIGIT &quot;M&quot; [dur-second]
+ *          dur-second = 1*DIGIT &quot;S&quot;
+ *          dur-day    = 1*DIGIT &quot;D&quot;
+ *     
+ *        Description: If the property permits, multiple &quot;duration&quot; values are
+ *        specified by a COMMA character (US-ASCII decimal 44) separated list
+ *        of values. The format is expressed as the [ISO 8601] basic format for
+ *        the duration of time. The format can represent durations in terms of
+ *        weeks, days, hours, minutes, and seconds.
+ *     
+ *        No additional content value encoding (i.e., BACKSLASH character
+ *        encoding) are defined for this value type.
+ *     
+ *        Example: A duration of 15 days, 5 hours and 20 seconds would be:
+ *     
+ *          P15DT5H0M20S
+ *     
+ *        A duration of 7 weeks would be:
+ *     
+ *          P7W
+ * </pre>
+ * 
+ * @author Ben Fortuna
+ */
+public class Duration extends Property {
+
+    private static final long serialVersionUID = 9144969653829796798L;
+
+    private Dur duration;
+
+    /**
+     * Default constructor.
+     */
+    public Duration() {
+        super(DURATION, PropertyFactoryImpl.getInstance());
+    }
+
+    /**
+     * @param aList a list of parameters for this component
+     * @param aValue a value string for this component
+     */
+    public Duration(final ParameterList aList, final String aValue) {
+        super(DURATION, aList, PropertyFactoryImpl.getInstance());
+        setValue(aValue);
+    }
+
+    /**
+     * @param duration a duration  value
+     */
+    public Duration(final Dur duration) {
+        super(DURATION, PropertyFactoryImpl.getInstance());
+        this.duration = duration;
+    }
+
+    /**
+     * @param aList a list of parameters for this component
+     * @param duration a duration value
+     */
+    public Duration(final ParameterList aList, final Dur duration) {
+        super(DURATION, aList, PropertyFactoryImpl.getInstance());
+        setDuration(duration);
+    }
+
+    /**
+     * Constructs a new duration representing the time between the specified start date and end date.
+     * @param start the starting time for the duration
+     * @param end the end time for the duration
+     */
+    public Duration(final Date start, final Date end) {
+        super(DURATION, PropertyFactoryImpl.getInstance());
+        setDuration(new Dur(start, end));
+    }
+
+    /**
+     * @return Returns the duration.
+     */
+    public final Dur getDuration() {
+        return duration;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final void setValue(final String aValue) {
+        // duration = DurationFormat.getInstance().parse(aValue);
+        duration = new Dur(aValue);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final String getValue() {
+        // return DurationFormat.getInstance().format(getDuration());
+        return duration.toString();
+    }
+
+    /**
+     * @param duration The duration to set.
+     */
+    public final void setDuration(final Dur duration) {
+        this.duration = duration;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final void validate() throws ValidationException {
+        // TODO: Auto-generated method stub
+    }
+}