diff -r 000000000000 -r fb9019fb1bf7 src/net/fortuna/ical4j/model/property/UtcProperty.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/net/fortuna/ical4j/model/property/UtcProperty.java	Tue Feb 10 18:12:00 2015 +0100
@@ -0,0 +1,119 @@
+/**
+ * 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 net.fortuna.ical4j.model.DateTime;
+import net.fortuna.ical4j.model.ParameterList;
+import net.fortuna.ical4j.model.PropertyFactory;
+import net.fortuna.ical4j.model.TimeZone;
+import net.fortuna.ical4j.model.ValidationException;
+
+/**
+ * $Id$
+ *
+ * Created on 8/08/2005
+ *
+ * Superclass for all properties with date-time values that must be specified in UTC time.
+ * @author Ben Fortuna
+ */
+public abstract class UtcProperty extends DateProperty {
+
+    /**
+     * 
+     */
+    private static final long serialVersionUID = 4850079486497487938L;
+
+    /**
+     * @param name a property name
+     * @param parameters list of parameters
+     */
+    public UtcProperty(final String name, final ParameterList parameters, PropertyFactory factory) {
+        super(name, parameters, factory);
+        setDate(new DateTime(true));
+    }
+
+    /**
+     * @param name a property name
+     */
+    public UtcProperty(final String name, PropertyFactory factory) {
+        super(name, factory);
+        setDate(new DateTime(true));
+    }
+
+    /**
+     * @return Returns the date-time.
+     */
+    public final DateTime getDateTime() {
+        return (DateTime) getDate();
+    }
+
+    /**
+     * @param dateTime The dateTime to set.
+     */
+    public void setDateTime(final DateTime dateTime) {
+        // time must be in UTC..
+        if (dateTime != null) {
+        	final DateTime utcDateTime = new DateTime(dateTime);
+            utcDateTime.setUtc(true);
+            setDate(utcDateTime);
+        }
+        else {
+            setDate(dateTime);
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void setTimeZone(TimeZone timezone) {
+        throw new UnsupportedOperationException("Cannot set timezone for UTC properties");
+    }
+    
+    /**
+     * {@inheritDoc}
+     */
+    public void validate() throws ValidationException {
+        super.validate();
+
+        if (getDate() != null && !(getDate() instanceof DateTime)) {
+            throw new ValidationException(
+                    "Property must have a DATE-TIME value");
+        }
+
+        final DateTime dateTime = (DateTime) getDate();
+
+        if (dateTime != null && !dateTime.isUtc()) {
+            throw new ValidationException(getName() + 
+                    ": DATE-TIME value must be specified in UTC time");
+        }
+    }
+}