diff --git a/modules/purchase/purchase.py b/modules/purchase/purchase.py
index 420423a..87b2c2c 100755
--- a/modules/purchase/purchase.py
+++ b/modules/purchase/purchase.py
@@ -741,6 +741,7 @@ class Purchase(
 
     @classmethod
     def copy(cls, purchases, default=None):
+        Date = Pool().get('ir.date')
         if default is None:
             default = {}
         else:
@@ -749,7 +750,7 @@ class Purchase(
         default.setdefault('invoice_state', 'none')
         default.setdefault('invoices_ignored', None)
         default.setdefault('shipment_state', 'none')
-        default.setdefault('purchase_date', None)
+        default.setdefault('purchase_date', Date.today())
         default.setdefault('quoted_by')
         default.setdefault('confirmed_by')
         default.setdefault('untaxed_amount_cache')
diff --git a/modules/sale/sale.py b/modules/sale/sale.py
index 3e64200..947b633 100755
--- a/modules/sale/sale.py
+++ b/modules/sale/sale.py
@@ -817,6 +817,7 @@ class Sale(
 
     @classmethod
     def copy(cls, sales, default=None):
+        Date = Pool().get('ir.date')
         if default is None:
             default = {}
         else:
@@ -825,7 +826,7 @@ class Sale(
         default.setdefault('invoice_state', 'none')
         default.setdefault('invoices_ignored', None)
         default.setdefault('shipment_state', 'none')
-        default.setdefault('sale_date', None)
+        default.setdefault('sale_date', Date.today())
         default.setdefault('quoted_by')
         default.setdefault('confirmed_by')
         default.setdefault('untaxed_amount_cache')