diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index a96c8cc0222..ad5ea4383f0 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -2053,7 +2053,7 @@ class AccountMove(models.Model):
             if not move.line_ids.filtered(lambda line: not line.display_type):
                 raise UserError(_('You need to add a line before posting.'))
             if move.auto_post and move.date > fields.Date.today():
-                date_msg = move.date.strftime(self.env['res.lang']._lang_get(self.env.user.lang).date_format)
+                date_msg = move.date.strftime(get_lang(self.env).date_format)
                 raise UserError(_("This move is configured to be auto-posted on %s" % date_msg))
 
             if not move.partner_id:
@@ -2084,7 +2084,7 @@ class AccountMove(models.Model):
         self.mapped('line_ids').create_analytic_lines()
         for move in self:
             if move.auto_post and move.date > fields.Date.today():
-                raise UserError(_("This move is configured to be auto-posted on {}".format(move.date.strftime(self.env['res.lang']._lang_get(self.env.user.lang).date_format))))
+                raise UserError(_("This move is configured to be auto-posted on {}".format(move.date.strftime(get_lang(self.env).date_format))))
 
             move.message_subscribe([p.id for p in [move.partner_id, move.commercial_partner_id] if p not in move.sudo().message_partner_ids])