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diff --git a/vendor/easyrdf/easyrdf/lib/EasyRdf/Literal/Date.php b/vendor/easyrdf/easyrdf/lib/EasyRdf/Literal/Date.php
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+++ b/vendor/easyrdf/easyrdf/lib/EasyRdf/Literal/Date.php
@@ -0,0 +1,137 @@
+<?php
+
+/**
+ * EasyRdf
+ *
+ * LICENSE
+ *
+ * Copyright (c) 2009-2013 Nicholas J Humfrey.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. The name of the author 'Nicholas J Humfrey" 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    EasyRdf
+ * @copyright  Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license    http://www.opensource.org/licenses/bsd-license.php
+ */
+
+/**
+ * Class that represents an RDF Literal of datatype xsd:date
+ *
+ * @package    EasyRdf
+ * @link       http://www.w3.org/TR/xmlschema-2/#date
+ * @copyright  Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license    http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Literal_Date extends EasyRdf_Literal
+{
+    /** Constructor for creating a new date literal
+     *
+     * If the value is a DateTime object, then it will be converted to the xsd:date format.
+     * If no value is given or is is null, then the current date is used.
+     *
+     * @see DateTime
+     *
+     * @param  mixed  $value     The value of the literal
+     * @param  string $lang      Should be null (literals with a datatype can't have a language)
+     * @param  string $datatype  Optional datatype (default 'xsd:date')
+     * @return object EasyRdf_Literal_Date
+     */
+    public function __construct($value = null, $lang = null, $datatype = null)
+    {
+        // If $value is null, use today's date
+        if (is_null($value)) {
+            $value = new DateTime('today');
+        }
+
+        // Convert DateTime object into string
+        if ($value instanceof DateTime) {
+            $value = $value->format('Y-m-d');
+        }
+
+        parent::__construct($value, null, $datatype);
+    }
+
+    /** Parses a string using DateTime and creates a new literal
+     *
+     * Example:
+     *   $date = EasyRdf_Literal_Date::parse('1 January 2011');
+     *
+     * @see DateTime
+     * @param string $value The date to parse
+     * @return object EasyRdf_Literal_Date
+     */
+    public static function parse($value)
+    {
+        $value = new DateTime($value);
+        return new EasyRdf_Literal_Date($value);
+    }
+
+    /** Returns the date as a PHP DateTime object
+     *
+     * @see DateTime::format
+     * @return string
+     */
+    public function getValue()
+    {
+        return new DateTime($this->value);
+    }
+
+    /** Returns date formatted according to given format
+     *
+     * @see DateTime::format
+     * @param string $format
+     * @return string
+     */
+    public function format($format)
+    {
+        return $this->getValue()->format($format);
+    }
+
+    /** A full integer representation of the year, 4 digits
+     *
+     * @return integer
+     */
+    public function year()
+    {
+        return (int)$this->format('Y');
+    }
+
+    /** Integer representation of the month
+     *
+     * @return integer
+     */
+    public function month()
+    {
+        return (int)$this->format('m');
+    }
+
+    /** Integer representation of the day of the month
+     *
+     * @return integer
+     */
+    public function day()
+    {
+        return (int)$this->format('d');
+    }
+}