diff --git a/apps/enm/tasks.py b/apps/enm/tasks.py
index 5fda51ab..dd81f3da 100644
--- a/apps/enm/tasks.py
+++ b/apps/enm/tasks.py
@@ -138,7 +138,7 @@ def correct_bill_date():
     now_time = datetime.datetime.now()
     update_time = now_time - datetime.timedelta(hours=24)
     bill_date = make_aware(update_time)
-    update_sysconfig({'enm1': {'bill_date': str(bill_date)}})
+    update_sysconfig({'enm1': {'bill_date': bill_date.strftime('%Y-%m-%d %H:%M:%S')}})
 
 
 @shared_task(base=CustomTask)