Use ir.date

sale.py

@@ -1,8 +1,8 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of this repository contains the full copyright notices and license terms.
+#This file is part of Tryton.  The COPYRIGHT file at the top level
+#of this repository contains the full copyright notices and license terms.
 "Sale"
 
 from trytond.osv import fields, OSV
-import datetime
 from decimal import Decimal
 from trytond.netsvc import LocalService
 from trytond.report import CompanyReport
@@ -158,7 +158,8 @@ class Sale(OSV):
         return 'draft'
 
     def default_sale_date(self, cursor, user, context=None):
-        return datetime.date.today()
+        date_obj = self.pool.get('ir.date')
+        return date_obj.today(cursor, user, context=context)
 
     def default_currency(self, cursor, user, context=None):
         company_obj = self.pool.get('company.company')