diff --git a/app/controllers/graduation_tasks_controller.rb b/app/controllers/graduation_tasks_controller.rb
index a159cff59..841b516bb 100644
--- a/app/controllers/graduation_tasks_controller.rb
+++ b/app/controllers/graduation_tasks_controller.rb
@@ -324,7 +324,7 @@ class GraduationTasksController < ApplicationController
     tip_exception("缺少截止时间参数") if params[:end_time].blank?
     tip_exception("截止时间必须晚于当前时间") if params[:end_time] <= strf_time(Time.now)
     tip_exception("截止时间不能晚于课堂结束时间（#{@course.end_date.end_of_day.strftime("%Y-%m-%d %H:%M")}）") if
-      @course.end_date.present? && params[:end_time] > @course.end_date.end_of_day
+      @course.end_date.present? && params[:end_time] > strf_time(@course.end_date.end_of_day)
 
     # ActiveRecord::Base.transaction do
       begin
@@ -401,7 +401,7 @@ class GraduationTasksController < ApplicationController
             tip_exception("截止时间不能早于当前时间") if params[:end_time] <= Time.now.strftime("%Y-%m-%d %H:%M:%S")
             tip_exception("截止时间不能早于发布时间") if params[:publish_time] > params[:end_time]
             tip_exception("截止时间不能晚于课堂结束时间（#{@course.end_date.end_of_day.strftime("%Y-%m-%d %H:%M")}）") if
-              @course.end_date.present? && params[:end_time] > @course.end_date.end_of_day
+              @course.end_date.present? && params[:end_time] > strf_time(@course.end_date.end_of_day)
 
             @task.publish_time = params[:publish_time]
             @task.end_time = params[:end_time]
@@ -414,7 +414,7 @@ class GraduationTasksController < ApplicationController
             tip_exception("截止时间不能为空") if params[:end_time].blank?
             tip_exception("截止时间不能早于当前时间") if params[:end_time] <= Time.now.strftime("%Y-%m-%d %H:%M:%S")
             tip_exception("截止时间不能晚于课堂结束时间（#{@course.end_date.end_of_day.strftime("%Y-%m-%d %H:%M")}）") if
-              @course.end_date.present? && params[:end_time] > @course.end_date.end_of_day
+              @course.end_date.present? && params[:end_time] > strf_time(@course.end_date.end_of_day)
             @task.end_time = params[:end_time]
           end
 
@@ -426,7 +426,7 @@ class GraduationTasksController < ApplicationController
             tip_exception("补交结束时间不能为空") if params[:late_time].blank?
             tip_exception("补交结束时间不能早于截止时间") if params[:late_time] <= @task.end_time
             tip_exception("补交结束时间不能晚于课堂结束时间（#{@course.end_date.end_of_day.strftime("%Y-%m-%d %H:%M")}）") if
-              @course.end_date.present? && params[:late_time] > @course.end_date.end_of_day
+              @course.end_date.present? && params[:late_time] > strf_time(@course.end_date.end_of_day)
             tip_exception("迟交扣分应为正整数") if params[:late_penalty] && params[:late_penalty].to_i < 0
 
             @task.allow_late = true