diff --git a/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/mongo/service/team/TeamBillCycleUtils.java b/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/mongo/service/team/TeamBillCycleUtils.java
index 84f10b64..2adebcb4 100644
--- a/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/mongo/service/team/TeamBillCycleUtils.java
+++ b/rc-service/rc-service-other/other-infrastructure/src/main/java/com/red/circle/other/infra/database/mongo/service/team/TeamBillCycleUtils.java
@@ -719,37 +719,30 @@ public final class TeamBillCycleUtils {
         return String.format("%d年%d月（%s）", year, month, batchDesc);
     }
 
-    public static LocalDateTime getBillBelongStartTime(Integer billBelong) {
-        int year, month;
+  public static LocalDateTime getBillBelongStartTime(Integer billBelong) {
+    // billBelong 格式：20251101 或 20251116
+    int year = billBelong / 10000;      // 2025
+    int month = (billBelong / 100) % 100;  // 11
+    int day = billBelong % 100;         // 01 或 16
 
-        if (billBelong > 999999) {
-            // 8位格式：20251016
-            year = billBelong / 10000;
-            month = (billBelong / 100) % 100;
-        } else {
-            // 6位格式：202510
-            year = billBelong / 100;
-            month = billBelong % 100;
-        }
-        LocalDateTime startTime = LocalDateTime.of(year, month, 1, 0, 0, 0);
-        return startTime;
-    }
-
-    public static LocalDateTime getBillBelongEndTime(Integer billBelong) {
-        int year, month;
-
-        if (billBelong > 999999) {
-            // 8位格式：20251016
-            year = billBelong / 10000;
-            month = (billBelong / 100) % 100;
-        } else {
-            // 6位格式：202510
-            year = billBelong / 100;
-            month = billBelong % 100;
-        }
-        LocalDateTime startTime = LocalDateTime.of(year, month, 1, 0, 0, 0);
-        LocalDateTime endTime = startTime.plusMonths(1).minusSeconds(1);
-        return endTime;
+    return LocalDateTime.of(year, month, day, 0, 0, 0);
+  }
+
+  public static LocalDateTime getBillBelongEndTime(Integer billBelong) {
+    // billBelong 格式：20251101 或 20251116
+    int year = billBelong / 10000;      // 2025
+    int month = (billBelong / 100) % 100;  // 11
+    int day = billBelong % 100;         // 01 或 16
+
+    LocalDateTime startTime = LocalDateTime.of(year, month, day, 0, 0, 0);
+
+    if (day == 1) {
+      // 如果是1号，结束时间是当月16号0点
+      return LocalDateTime.of(year, month, 16, 0, 0, 0);
+    } else {
+      // 如果是16号，结束时间是下个月1号0点
+      return startTime.plusMonths(1).withDayOfMonth(1);
     }
+  }
 
 }