diff -r 000000000000 -r fb9019fb1bf7 src/net/fortuna/ical4j/model/property/ExDate.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/net/fortuna/ical4j/model/property/ExDate.java	Tue Feb 10 18:12:00 2015 +0100
@@ -0,0 +1,116 @@
+/**
+ * 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.text.ParseException;
+
+import net.fortuna.ical4j.model.DateList;
+import net.fortuna.ical4j.model.Parameter;
+import net.fortuna.ical4j.model.ParameterList;
+import net.fortuna.ical4j.model.PropertyFactoryImpl;
+import net.fortuna.ical4j.model.ValidationException;
+import net.fortuna.ical4j.model.parameter.Value;
+import net.fortuna.ical4j.util.ParameterValidator;
+
+/**
+ * $Id$
+ * 
+ * Created: [Apr 6, 2004]
+ *
+ * Defines a EXDATE iCalendar component property.
+ * @author benf
+ */
+public class ExDate extends DateListProperty {
+
+    private static final long serialVersionUID = 2635730172243974463L;
+
+    /**
+     * Default constructor.
+     */
+    public ExDate() {
+        super(EXDATE, PropertyFactoryImpl.getInstance());
+    }
+
+    /**
+     * @param aList a list of parameters for this component
+     * @param aValue a value string for this component
+     * @throws ParseException where the specified value string is not a valid date-time/date representation
+     */
+    public ExDate(final ParameterList aList, final String aValue)
+            throws ParseException {
+        super(EXDATE, aList, PropertyFactoryImpl.getInstance());
+        setValue(aValue);
+    }
+
+    /**
+     * @param dList a list of dates
+     */
+    public ExDate(final DateList dList) {
+        super(EXDATE, dList, PropertyFactoryImpl.getInstance());
+    }
+
+    /**
+     * @param aList a list of parameters for this component
+     * @param dList a list of dates
+     */
+    public ExDate(final ParameterList aList, final DateList dList) {
+        super(EXDATE, aList, dList, PropertyFactoryImpl.getInstance());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final void validate() throws ValidationException {
+
+        /*
+         * ; the following are optional, ; but MUST NOT occur more than once (";" "VALUE" "=" ("DATE-TIME" / "DATE")) /
+         * (";" tzidparam) /
+         */
+        ParameterValidator.getInstance().assertOneOrLess(Parameter.VALUE,
+                getParameters());
+
+        final Parameter valueParam = getParameter(Parameter.VALUE);
+
+        if (valueParam != null && !Value.DATE_TIME.equals(valueParam)
+                && !Value.DATE.equals(valueParam)) {
+            throw new ValidationException("Parameter [" + Parameter.VALUE
+                    + "] is invalid");
+        }
+
+        ParameterValidator.getInstance().assertOneOrLess(Parameter.TZID,
+                getParameters());
+
+        /*
+         * ; the following is optional, ; and MAY occur more than once (";" xparam)
+         */
+    }
+}