update

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

@@ -694,7 +694,7 @@ public class TeacherAttendanceServiceImpl extends BaseServiceImpl<Long, TeacherA
 			if(signInStatus != null && teacherAttendance.getSignInStatus() != YesOrNoEnum.YES){
 				String startTime = DateUtil.format(courseSchedule.getStartClassTime(), DateUtil.EXPANDED_TIME_FORMAT);
 				Date date = DateUtil.stringToDate(classDate + ' ' + startTime, DateUtil.EXPANDED_DATE_TIME_FORMAT);
-				teacherAttendance.setSignInTime(DateUtil.addMinutes(date,1));
+				teacherAttendance.setSignInTime(DateUtil.addMinutes(date,-1));
 				teacherAttendance.setSignInStatus(YesOrNoEnum.YES);
 			}
 			if(signOutStatus != null && teacherAttendance.getSignOutStatus() != YesOrNoEnum.YES){