update

app/service/student.js

@@ -419,7 +419,7 @@ class StudentService extends CrudService {
     for (const id of ids) {
       const cla = await this.ctx.service.class.fetch({ id });
       if (!cla) continue;
-      cla.date = moment(cla.date).add(1, 'd').format('YYYY-MM-DD');
+      cla.date = moment(cla.startdate).add(1, 'd').format('YYYY-MM-DD');
       classList.push(cla);
     }
     studentList = studentList.map(i => {