diff --git a/sao/src/common.js b/sao/src/common.js
index 2e2aece0b0..7b01470a8d 100644
--- a/sao/src/common.js
+++ b/sao/src/common.js
@@ -228,16 +228,8 @@
     ];
 
     Sao.common.date_format = function(format) {
-        if (jQuery.isEmptyObject(format)) {
-            format = '%x';
-            if (Sao.Session.current_session) {
-                var context = Sao.Session.current_session.context;
-                if (context.locale && context.locale.date) {
-                    format = context.locale.date;
-                }
-            }
-        }
-        return Sao.common.moment_format(format);
+        return Sao.common.moment_format(
+            format || Sao.i18n.locale.date || '%x');
     };
 
     Sao.common.format_time = function(format, date) {
diff --git a/tryton/tryton/common/common.py b/tryton/tryton/common/common.py
index 5d3d6dd36f..67f2beb05d 100644
--- a/tryton/tryton/common/common.py
+++ b/tryton/tryton/common/common.py
@@ -37,6 +37,7 @@ from string import Template
 from threading import Lock, Thread
 
 import tryton.rpc as rpc
+import tryton.translate as translate
 from tryton.cache import CacheDict
 from tryton.config import CONFIG, PIXMAPS_DIR, SOUNDS_DIR, TRYTON_ICON
 
@@ -1528,7 +1529,7 @@ def get_align(float_, expand=True):
 
 
 def date_format(format_=None):
-    return format_ or rpc.CONTEXT.get('locale', {}).get('date', '%x')
+    return format_ or translate.DATE or '%x'
 
 
 def idle_add(func):
diff --git a/tryton/tryton/translate.py b/tryton/tryton/translate.py
index 8b764bb222..7eae072873 100644
--- a/tryton/tryton/translate.py
+++ b/tryton/tryton/translate.py
@@ -12,6 +12,7 @@ from gi.repository import Gtk
 from tryton.config import CURRENT_DIR
 
 _ = gettext.gettext
+DATE = None
 
 _LOCALE2WIN32 = {
     'af_ZA': 'Afrikaans_South Africa',
@@ -196,8 +197,10 @@ def setlang(lang=None, locale_dict=None):
         conv = locale.localeconv()
         for field in list(locale_dict.keys()):
             if field == 'date':
-                continue
-            conv[field] = locale_dict[field]
+                global DATE
+                DATE = locale_dict[field]
+            else:
+                conv[field] = locale_dict[field]
         locale.localeconv = lambda: conv