diff --git a/ecommerce/pricing/lib/pricing/promotions_calendar.rb b/ecommerce/pricing/lib/pricing/promotions_calendar.rb
index 817d9aca..70b61e5e 100644
--- a/ecommerce/pricing/lib/pricing/promotions_calendar.rb
+++ b/ecommerce/pricing/lib/pricing/promotions_calendar.rb
@@ -45,9 +45,8 @@ def initialize(start_time, end_time, discount)
       end
 
       def running?(timestamp)
-        (@start_time...@end_time).include?(timestamp)
+        (@start_time...@end_time).cover?(timestamp)
       end
-
     end
   end
 end