fix:后端创建时间默认值约定修改

src/modules/course-manage/components/LiveCourseList.jsx

@@ -299,7 +299,7 @@ class LiveCourseList extends React.Component {
           dataIndex: 'created',
           sorter: true,
           render: (val, item) => {
-            return <span>{val === 0 ? '-' : formatDate('YYYY-MM-DD H:i', val)}</span>;
+            return <span>{val === -29000 ? '-' : formatDate('YYYY-MM-DD H:i', val)}</span>;
           },
         },
         {