diff --git a/core/lib/Thelia/Coupon/ExpirationDateTransformer.php b/core/lib/Thelia/Coupon/ExpirationDateTransformer.php
deleted file mode 100644
index f63d8ebdd..000000000
--- a/core/lib/Thelia/Coupon/ExpirationDateTransformer.php
+++ /dev/null
@@ -1,105 +0,0 @@
-<?php
-/*************************************************************************************/
-/*      This file is part of the Thelia package.                                     */
-/*                                                                                   */
-/*      Copyright (c) OpenStudio                                                     */
-/*      email : dev@thelia.net                                                       */
-/*      web : http://www.thelia.net                                                  */
-/*                                                                                   */
-/*      For the full copyright and license information, please view the LICENSE.txt  */
-/*      file that was distributed with this source code.                             */
-/*************************************************************************************/
-
-namespace Thelia\Coupon;
-
-use Symfony\Component\Form\DataTransformerInterface;
-use Symfony\Component\Form\Exception\TransformationFailedException;
-use Thelia\Model\LangQuery;
-
-/**
- * @author Franck Allimant <franck@cqfdev.fr>
- *
- * Creation date: 02/05/14 15:20
- */
-class ExpirationDateTransformer implements DataTransformerInterface
-{
-
-    /**
-     * Transforms a value from the original representation to a transformed representation.
-     *
-     * This method is called on two occasions inside a form field:
-     *
-     * 1. When the form field is initialized with the data attached from the datasource (object or array).
-     * 2. When data from a request is bound using {@link Form::bind()} to transform the new input data
-     *    back into the renderable format. For example if you have a date field and bind '2009-10-10' onto
-     *    it you might accept this value because its easily parsed, but the transformer still writes back
-     *    "2009/10/10" onto the form field (for further displaying or other purposes).
-     *
-     * This method must be able to deal with empty values. Usually this will
-     * be NULL, but depending on your implementation other empty values are
-     * possible as well (such as empty strings). The reasoning behind this is
-     * that value transformers must be chainable. If the transform() method
-     * of the first value transformer outputs NULL, the second value transformer
-     * must be able to process that value.
-     *
-     * By convention, transform() should return an empty string if NULL is
-     * passed.
-     *
-     * @param mixed $value The value in the original representation
-     *
-     * @return mixed The value in the transformed representation
-     *
-     * @throws TransformationFailedException When the transformation fails.
-     */
-    public function transform($value)
-    {
-        if (empty($value)) return '';
-
-        // Get the default language
-        $lang = LangQuery::create()->findOneByByDefault(1);
-
-        if (false !== $dt = \DateTime::createFromFormat($lang->getDateFormat(), $value)) {
-            return $dt->format("Y-m-d");
-        }
-
-        throw new TransformationFailedException(sprintf('Failed to transform "%s" using format "%s"', $value, $lang->getDateFormat()));
-    }
-
-    /**
-     * Transforms a value from the transformed representation to its original
-     * representation.
-     *
-     * This method is called when {@link Form::bind()} is called to transform the requests tainted data
-     * into an acceptable format for your data processing/model layer.
-     *
-     * This method must be able to deal with empty values. Usually this will
-     * be an empty string, but depending on your implementation other empty
-     * values are possible as well (such as empty strings). The reasoning behind
-     * this is that value transformers must be chainable. If the
-     * reverseTransform() method of the first value transformer outputs an
-     * empty string, the second value transformer must be able to process that
-     * value.
-     *
-     * By convention, reverseTransform() should return NULL if an empty string
-     * is passed.
-     *
-     * @param mixed $value The value in the transformed representation
-     *
-     * @return mixed The value in the original representation
-     *
-     * @throws TransformationFailedException When the transformation fails.
-     */
-    public function reverseTransform($value)
-    {
-        if (empty($value)) return '';
-
-        // Get the default language
-        $lang = LangQuery::create()->findOneByByDefault(1);
-
-        if (false !== $dt = \DateTime::createFromFormat('Y-m-d', $value)) {
-            return $dt->format($lang->getDateFormat());
-        }
-
-        throw new TransformationFailedException(sprintf('Failed to reverse transform "%s" using format "%s"', $value, $lang->getDateFormat()));
-    }
-}
\ No newline at end of file