diff --git a/app/serializers/api/admin/index_standing_order_serializer.rb b/app/serializers/api/admin/index_standing_order_serializer.rb
index 8c26d58c4a..1fb1effa2d 100644
--- a/app/serializers/api/admin/index_standing_order_serializer.rb
+++ b/app/serializers/api/admin/index_standing_order_serializer.rb
@@ -13,10 +13,10 @@ class Api::Admin::IndexStandingOrderSerializer < ActiveModel::Serializer
   end
 
   def begins_on
-    object.begins_at.strftime('%b %d, %Y')
+    object.begins_at.strftime('%a, %b %d, %Y')
   end
 
   def ends_on
-    object.ends_at.andand.strftime('%b %d, %Y') || I18n.t(:ongoing)
+    object.ends_at.andand.strftime('%a, %b %d, %Y') || I18n.t(:ongoing)
   end
 end