diff --git a/apps/payment/models.py b/apps/payment/models.py
index 8dbbccb6..b1368dc4 100644
--- a/apps/payment/models.py
+++ b/apps/payment/models.py
@@ -188,7 +188,7 @@ class SchoolPayment(Payment):
             month_price_sum = aggregate.get('month_price__sum', 0) * weekday_count // all_weekday_count
         else:
             month_price_sum = aggregate.get('month_price__sum', 0)
-        if month_price_sum > config.SERVICE_DISCOUNT_MIN_AMOUNT:
+        if month_price_sum >= config.SERVICE_DISCOUNT_MIN_AMOUNT:
             discount = config.SERVICE_DISCOUNT
         else:
             discount = 0
diff --git a/apps/payment/views.py b/apps/payment/views.py
index d719beb9..7d9aeded 100644
--- a/apps/payment/views.py
+++ b/apps/payment/views.py
@@ -1,5 +1,6 @@
-import logging
+import arrow
 import json
+import logging
 
 from datetime import timedelta
 from urllib.parse import urlsplit
@@ -203,11 +204,11 @@ class PaymentwallCallbackView(View):
                             date_start = now()
                             date_end = school_payment.date_end
                         else:
-                            date_start = school_payment.date_end + timedelta(days=1)
-                            date_end = date_start + timedelta(days=30)
+                            date_start = arrow.get(school_payment.date_end).shift(days=1).datetime
+                            date_end = arrow.get(date_start).shift(months=1).datetime
                     else:
                         date_start = now()
-                        date_end = now() + timedelta(days=30)
+                        date_end = arrow.get(date_start).shift(months=1).datetime
                     payment.date_start = date_start
                     payment.date_end = date_end
             if product_type_name == 'course':