diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index b74bc8a4e96..fef4856a46e 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -6083,7 +6083,7 @@ abstract class CommonObject
 						$datenotinstring = $this->array_options['options_' . $key];
 						if (! is_numeric($this->array_options['options_' . $key]))	// For backward compatibility
 						{
-							$datenotinstring = $db->jdate($datenotinstring);
+							$datenotinstring = $this->db->jdate($datenotinstring);
 						}
 						$value = GETPOSTISSET($keyprefix.'options_'.$key.$keysuffix)?dol_mktime(GETPOST($keyprefix.'options_'.$key.$keysuffix."hour", 'int', 3), GETPOST($keyprefix.'options_'.$key.$keysuffix."min",'int',3), 0, GETPOST($keyprefix.'options_'.$key.$keysuffix."month",'int',3), GETPOST($keyprefix.'options_'.$key.$keysuffix."day",'int',3), GETPOST($keyprefix.'options_'.$key.$keysuffix."year",'int',3)):$datenotinstring;
 					}