提交试卷时，后端时间和前端不一致的处理方法

app/controllers/exercises_controller.rb

@@ -1103,6 +1103,7 @@ class ExercisesController < ApplicationController
     ActiveRecord::Base.transaction do
       begin
         can_commit_exercise = false
+        user_left_time = nil
         if @user_course_identity > Course::ASSISTANT_PROFESSOR  #为学生时
           if params[:commit_method].to_i == 2   #自动提交时
             user_left_time = get_exercise_left_time(@exercise,current_user)
@@ -1131,7 +1132,7 @@ class ExercisesController < ApplicationController
             CommitExercsieNotifyJobJob.perform_later(@exercise.id, current_user.id)
             normal_status(0,"试卷提交成功！")
           else
-            normal_status(-1,"提交失败，未到截止时间!")
+            normal_status(-2,"#{user_left_time.to_i}")
           end
         else
           normal_status(-1,"提交失败，当前用户不为课堂学生!")