1、存在毫秒导致的日期判断错误

mec-biz/src/main/java/com/ym/mec/biz/service/impl/PracticeGroupServiceImpl.java

@@ -72,8 +72,6 @@ public class PracticeGroupServiceImpl extends BaseServiceImpl<Long, PracticeGrou
     private MusicGroupDao musicGroupDao;
     @Autowired
     private ImFeignService imFeignService;
-    @Autowired
-    private StudentDao studentDao;
 
     private static Map<Integer, Map<Integer, List<Integer>>> schoolSubjectTeachersMap;