diff --git a/houtai/tixian_profit_views.py b/houtai/tixian_profit_views.py
index 5dc634a..932cd3c 100644
--- a/houtai/tixian_profit_views.py
+++ b/houtai/tixian_profit_views.py
@@ -12,6 +12,7 @@ import logging
 from datetime import datetime, time
 from decimal import Decimal
 
+from django.conf import settings
 from django.db.models import (
     Count, DecimalField, F, Q, Sum, Value,
 )
@@ -59,10 +60,10 @@ def _parse_date(s):
 
 
 def _day_bounds(d):
-    """本地日历日 → aware datetime 区间 [start, end)"""
+    """日历日 → datetime 区间 [start, end]；兼容 USE_TZ=False（MySQL 禁止 aware datetime）。"""
     start = datetime.combine(d, time.min)
-    end = datetime.combine(d, time.max)
-    if timezone.is_naive(start):
+    end = datetime.combine(d, time(23, 59, 59, 999999))
+    if getattr(settings, 'USE_TZ', False):
         tz = timezone.get_current_timezone()
         start = timezone.make_aware(start, tz)
         end = timezone.make_aware(end, tz)