Probleme Call to undefined method Mage_Core_Model_Locale::getDateFormatWithLongYear() in /home/.../public_html/.../app/code/core/Mage/Adminhtml/Block/Widget/Form.php on line 207 Solutions I fixed by copying /app/code/core/Mage/Adminhtml/Block/Widget/Form.php to /app/code/local/Mage/Adminhtml/Block/Widget/Form.php Changing line 207 to read: $element->setFormat(Mage::app()->getLocale()->getDateFormat(Mage_Core_Model_Locale::FORMAT_TYPE_SHORT));