diff -r 000000000000 -r 7f95f8617b0b vendor/doctrine/lib/Doctrine/ORM/Query/AST/Functions/DateSubFunction.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/doctrine/lib/Doctrine/ORM/Query/AST/Functions/DateSubFunction.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,58 @@
+<?php
+/*
+ * 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.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the LGPL. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\ORM\Query\AST\Functions;
+
+use Doctrine\ORM\Query\Lexer;
+use Doctrine\ORM\Query\SqlWalker;
+use Doctrine\ORM\Query\Parser;
+use Doctrine\ORM\Query\QueryException;
+
+/**
+ * "DATE_ADD(date1, interval, unit)"
+ *
+ * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
+ * @link    www.doctrine-project.org
+ * @since   2.0
+ * @author  Benjamin Eberlei <kontakt@beberlei.de>
+ */
+class DateSubFunction extends DateAddFunction
+{
+    public $firstDateExpression = null;
+    public $intervalExpression = null;
+    public $unit = null;
+
+    public function getSql(SqlWalker $sqlWalker)
+    {
+        $unit = strtolower($this->unit);
+        if ($unit == "day") {
+            return $sqlWalker->getConnection()->getDatabasePlatform()->getDateSubDaysExpression(
+                $this->firstDateExpression->dispatch($sqlWalker),
+                $this->intervalExpression->dispatch($sqlWalker)
+            );
+        } else if ($unit == "month") {
+            return $sqlWalker->getConnection()->getDatabasePlatform()->getDateSubMonthExpression(
+                $this->firstDateExpression->dispatch($sqlWalker),
+                $this->intervalExpression->dispatch($sqlWalker)
+            );
+        } else {
+            throw QueryException::semanticalError('DATE_SUB() only supports units of type day and month.');
+        }
+    }
+}
\ No newline at end of file