调整

app/views/courses/settings.json.jbuilder

@@ -5,6 +5,7 @@ json.course_id @course.id
 json.school @course.school&.name
 json.class_period @course.class_period
 json.credit @course.credit
+json.start_date @course.start_date
 json.end_date @course.end_date
 json.is_public @course.is_public
 json.course_module_types @course.course_modules.where(hidden: 0).pluck(:module_type)