添加记录统计时间

app/controllers/courses_controller.rb

@@ -1548,7 +1548,8 @@ class CoursesController < ApplicationController
     render json: {
       total_duration: @total_duration,
       freq: @frequencies,
-      people_num: @people_num
+      people_num: @people_num,
+      begin_at: '2020-03-13 24:00'
     }
   end