diff --git a/orders/services/fake_order_pool.py b/orders/services/fake_order_pool.py
index dd6a1aa..cfa5384 100644
--- a/orders/services/fake_order_pool.py
+++ b/orders/services/fake_order_pool.py
@@ -1,6 +1,6 @@
 """抢单大厅假单：无资格/封禁打手仅展示假数据。"""
 import random
-from datetime import timedelta
+from datetime import datetime, timedelta
 from decimal import Decimal
 
 from django.core.exceptions import ObjectDoesNotExist
@@ -55,6 +55,26 @@ def _ensure_aware(dt):
     return dt
 
 
+def _to_unix_ts(dt):
+    """统一转为 Unix 时间戳，避免 naive/aware 直接相减报错。"""
+    if dt is None:
+        return None
+    if timezone.is_aware(dt):
+        return dt.timestamp()
+    try:
+        return timezone.make_aware(dt, timezone.get_current_timezone()).timestamp()
+    except Exception:
+        return dt.timestamp()
+
+
+def _elapsed_seconds(since_dt, until_dt):
+    since_ts = _to_unix_ts(since_dt)
+    until_ts = _to_unix_ts(until_dt)
+    if since_ts is None or until_ts is None:
+        return None
+    return until_ts - since_ts
+
+
 def _parse_shuffle_time(value):
     if not value:
         return None
@@ -68,8 +88,14 @@ def _display_time_str_for_order(order_id, anchor_dt):
     """同一假单在打乱窗口内展示时间固定。"""
     seed = abs(hash(str(order_id))) % (2 ** 32)
     seconds_ago = 120 + (seed % 181)
-    base = _ensure_aware(anchor_dt) or timezone.now()
-    return fmt_datetime(base - timedelta(seconds=seconds_ago))
+    base_ts = _to_unix_ts(_ensure_aware(anchor_dt) or timezone.now())
+    if base_ts is None:
+        base_ts = _to_unix_ts(timezone.now()) or 0
+    display_dt = datetime.fromtimestamp(
+        base_ts - seconds_ago,
+        tz=timezone.get_current_timezone(),
+    )
+    return fmt_datetime(display_dt)
 
 
 def _load_fake_rows_in_saved_order(club_id, leixing_id):
@@ -107,10 +133,12 @@ def _load_fake_rows_in_saved_order(club_id, leixing_id):
         if not last_dt and not created:
             last_dt = _ensure_aware(state.LastShuffleTime)
 
+        elapsed = _elapsed_seconds(last_dt, now)
         need_reshuffle = (
             not stored_ids
             or last_dt is None
-            or (now - last_dt).total_seconds() >= interval
+            or elapsed is None
+            or elapsed >= interval
         )
 
         if need_reshuffle: