diff --git a/klp-wms/src/main/java/com/klp/service/impl/WmsAttendanceCheckServiceImpl.java b/klp-wms/src/main/java/com/klp/service/impl/WmsAttendanceCheckServiceImpl.java
index 45b4179d..9bd57956 100644
--- a/klp-wms/src/main/java/com/klp/service/impl/WmsAttendanceCheckServiceImpl.java
+++ b/klp-wms/src/main/java/com/klp/service/impl/WmsAttendanceCheckServiceImpl.java
@@ -130,11 +130,12 @@ public class WmsAttendanceCheckServiceImpl implements IWmsAttendanceCheckService
         List<WmsAttendanceCheck> checksToInsert = new ArrayList<>(toProcess.size());
         for (WmsAttendanceScheduleVo schedule : toProcess) {
             boolean crossDay = isCrossDayShift(schedule);
+            boolean backward = isBackwardCrossDay(schedule);
             List<AttendanceRecords> records = sliceRecordsForDay(
                 recordsByEmployee.get(schedule.getEmployeeName()),
                 schedule.getWorkDate(),
-                crossDay);
-            checksToInsert.add(buildCheck(schedule, rule, records));
+                crossDay, backward);
+            checksToInsert.add(buildCheck(schedule, rule, records, crossDay));
         }
 
         baseMapper.insertBatch(checksToInsert, BATCH_SIZE);
@@ -146,6 +147,12 @@ public class WmsAttendanceCheckServiceImpl implements IWmsAttendanceCheckService
         return schedule.getShiftIsCrossDay() != null && schedule.getShiftIsCrossDay() == 1;
     }
 
+    private boolean isBackwardCrossDay(WmsAttendanceScheduleVo schedule) {
+        if (!isCrossDayShift(schedule)) return false;
+        if (schedule.getShiftStartTime() == null || schedule.getShiftEndTime() == null) return false;
+        return toLocalTime(schedule.getShiftStartTime()).getHour() >= 16;
+    }
+
     private WmsAttendanceRule getActiveRule() {
         LambdaQueryWrapper<WmsAttendanceRule> wrapper = Wrappers.lambdaQuery();
         wrapper.eq(WmsAttendanceRule::getDelFlag, 0);
@@ -207,13 +214,13 @@ public class WmsAttendanceCheckServiceImpl implements IWmsAttendanceCheckService
     /**
      * 与原先 {@code getRecords(ename, workDate, crossDay)} 的时间窗口一致。
      */
-    private List<AttendanceRecords> sliceRecordsForDay(List<AttendanceRecords> prefetched, Date workDate, boolean crossDay) {
+    private List<AttendanceRecords> sliceRecordsForDay(List<AttendanceRecords> prefetched, Date workDate, boolean crossDay, boolean backward) {
         if (prefetched == null || prefetched.isEmpty()) {
             return new ArrayList<>();
         }
         LocalDate ld = toLocalDate(workDate);
         LocalDateTime rangeStart = ld.atStartOfDay();
-        LocalDateTime rangeEnd = crossDay
+        LocalDateTime rangeEnd = crossDay && !backward
             ? ld.plusDays(1).atTime(LocalTime.of(23, 59, 59))
             : ld.atTime(LocalTime.of(23, 59, 59));
         return prefetched.stream()
@@ -238,7 +245,7 @@ public class WmsAttendanceCheckServiceImpl implements IWmsAttendanceCheckService
     }
 
     private WmsAttendanceCheck buildCheck(WmsAttendanceScheduleVo schedule, WmsAttendanceRule rule,
-                                           List<AttendanceRecords> records) {
+                                           List<AttendanceRecords> records, boolean crossDay) {
         WmsAttendanceCheck check = new WmsAttendanceCheck();
         check.setScheduleId(schedule.getScheduleId());
         check.setUserId(schedule.getUserId());
@@ -249,7 +256,6 @@ public class WmsAttendanceCheckServiceImpl implements IWmsAttendanceCheckService
         check.setShiftType(schedule.getShiftType());
 
         boolean hasPeriod2 = schedule.getShiftStartTime2() != null && schedule.getShiftEndTime2() != null;
-        boolean crossDay = isCrossDayShift(schedule);
 
         if (records.isEmpty()) {
             check.setOverallStatus("absent_full");
@@ -303,7 +309,12 @@ public class WmsAttendanceCheckServiceImpl implements IWmsAttendanceCheckService
         LocalDateTime windowStart;
         LocalDateTime windowEnd;
 
-        if (crossDay) {
+        boolean backward = st != null && et != null && st.getHour() >= 16 && crossDay;
+
+        if (crossDay && backward) {
+            windowStart = LocalDateTime.of(ld, et).minusHours(2);
+            windowEnd = LocalDateTime.of(ld, et).plusHours(2);
+        } else if (crossDay) {
             windowStart = LocalDateTime.of(ld, st).minusHours(2);
             windowEnd = LocalDateTime.of(ld.plusDays(1), et).plusHours(2);
         } else if (st != null && et != null) {