diff --git a/product_contract/__manifest__.py b/product_contract/__manifest__.py
index fc857821..d1dc37ee 100644
--- a/product_contract/__manifest__.py
+++ b/product_contract/__manifest__.py
@@ -7,15 +7,10 @@
     'version': '12.0.1.0.0',
     'category': 'Contract Management',
     'license': 'AGPL-3',
-    'author': "LasLabs, "
-              "ACSONE SA/NV, "
-              "Odoo Community Association (OCA)",
+    'author': "LasLabs, " "ACSONE SA/NV, " "Odoo Community Association (OCA)",
     'website': 'https://github.com/oca/contract',
     'depends': ['product', 'contract_sale'],
-    'data': [
-        'views/product_template.xml',
-        'views/sale_order.xml',
-    ],
+    'data': ['views/product_template.xml', 'views/sale_order.xml'],
     'installable': True,
     'application': False,
 }
diff --git a/product_contract/models/sale_order_line.py b/product_contract/models/sale_order_line.py
index 4a41c2a6..07195dcc 100644
--- a/product_contract/models/sale_order_line.py
+++ b/product_contract/models/sale_order_line.py
@@ -2,6 +2,7 @@
 # Copyright 2017 ACSONE SA/NV.
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
+from dateutil.relativedelta import relativedelta
 from odoo import api, fields, models, _
 from odoo.exceptions import ValidationError
 
@@ -105,20 +106,23 @@ class SaleOrderLine(models.Model):
             'discount': self.discount,
             'date_end': self.date_end,
             'date_start': self.date_start or fields.Date.today(),
-            'recurring_next_date': contract_line_env._compute_first_recurring_next_date(
-                self.date_start or fields.Date.today(),
-                self.recurring_invoicing_type,
-                self.recurring_rule_type,
-                self.recurring_interval,
-            ),
+            'recurring_next_date': 
+                contract_line_env._compute_first_recurring_next_date(
+                    self.date_start or fields.Date.today(),
+                    self.recurring_invoicing_type,
+                    self.recurring_rule_type,
+                    self.recurring_interval,
+                ),
             'recurring_interval': self.recurring_interval,
             'recurring_invoicing_type': self.recurring_invoicing_type,
             'recurring_rule_type': self.recurring_rule_type,
             'is_auto_renew': self.product_id.is_auto_renew,
             'auto_renew_interval': self.product_id.auto_renew_interval,
             'auto_renew_rule_type': self.product_id.auto_renew_rule_type,
-            'termination_notice_interval': self.product_id.termination_notice_interval,
-            'termination_notice_rule_type': self.product_id.termination_notice_rule_type,
+            'termination_notice_interval':
+                self.product_id.termination_notice_interval,
+            'termination_notice_rule_type':
+                self.product_id.termination_notice_rule_type,
             'contract_id': contract.id,
             'sale_order_line_id': self.id,
         }
@@ -133,7 +137,9 @@ class SaleOrderLine(models.Model):
             )
             contract_line |= new_contract_line
             if rec.contract_line_id:
-                rec.contract_line_id.stop(rec.date_start)
+                rec.contract_line_id.stop(
+                    rec.date_start - relativedelta(days=1)
+                )
                 rec.contract_line_id.successor_contract_line_id = (
                     new_contract_line
                 )
diff --git a/product_contract/tests/test_sale_order.py b/product_contract/tests/test_sale_order.py
index de46f93c..5409ebc3 100644
--- a/product_contract/tests/test_sale_order.py
+++ b/product_contract/tests/test_sale_order.py
@@ -208,7 +208,7 @@ class TestSaleOrder(TransactionCase):
         self.order_line1.onchange_product()
         self.sale.action_confirm()
         self.assertEqual(
-            self.contract_line.date_end, Date.to_date("2018-06-01")
+            self.contract_line.date_end, Date.to_date("2018-05-31")
         )
         self.assertFalse(self.contract_line.is_auto_renew)
         new_contract_line = self.env['account.analytic.invoice.line'].search(