Actualización

main/inc/lib/formvalidator/Rule/DateCompare.php

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+<?php
+/* For licensing terms, see /license.txt */
+
+/**
+ * Class HTML_QuickForm_Rule_DateCompare.
+ *
+ * @author Julio Montoya
+ */
+class HTML_QuickForm_Rule_DateCompare extends HTML_QuickForm_Rule_Compare
+{
+    /**
+     * Validate 2 dates.
+     *
+     * @param array $values array with the 2 dates
+     * @param $operator
+     *
+     * @return bool true if the 2 given dates match the operator
+     */
+    public function validate($values, $operator = null)
+    {
+        return api_strtotime($values[0]) < api_strtotime($values[1]);
+    }
+}