diff --git a/sale.py b/sale.py
index 0ae54fc..a2941e7 100644
--- a/sale.py
+++ b/sale.py
@@ -5,7 +5,7 @@ from operator import attrgetter
 from decimal import Decimal
 from sql import Table
 from sql.aggregate import Sum
-from datetime import date, timedelta
+from datetime import date, timedelta, datetime
 from time import sleep
 
 from trytond.pool import Pool, PoolMeta