diff --git a/addons/account/account.py b/addons/account/account.py
index 8134c6d0c30..7fbab48d436 100644
--- a/addons/account/account.py
+++ b/addons/account/account.py
@@ -48,7 +48,7 @@ class account_payment_term(osv.osv):
 
     def compute(self, cr, uid, id, value, date_ref=False, context={}):
         if not date_ref:
-            date_ref = now().strftime('%Y-%m-%d')
+            date_ref = datetime.now().strftime('%Y-%m-%d')
         pt = self.browse(cr, uid, id, context)
         amount = value
         result = []
diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index ba44f413410..15c2c93b8fb 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -24,7 +24,7 @@ import netsvc
 from osv import fields, osv
 from tools.translate import _
 
-from datetime import now
+from datetime import datetime
 
 import tools
 
@@ -484,7 +484,7 @@ class account_move_line(osv.osv):
         if not partner_id:
             return {'value':val}
         if not date:
-            date = now().strftime('%Y-%m-%d')
+            date = datetime.now().strftime('%Y-%m-%d')
         part = self.pool.get('res.partner').browse(cr, uid, partner_id)
 
         if part.property_payment_term and part.property_payment_term.line_ids:
diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index f3997e6334d..60e5b39a183 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -22,7 +22,7 @@
 import time
 import netsvc
 from osv import fields, osv
-from datetime import datetime, now
+from datetime import datetime
 from dateutil.relativedelta import relativedelta
 from tools import config
 from tools.translate import _