diff --git a/merchant_ops/services/action_stats.py b/merchant_ops/services/action_stats.py
index 2db3ced..bdcdd16 100644
--- a/merchant_ops/services/action_stats.py
+++ b/merchant_ops/services/action_stats.py
@@ -15,22 +15,35 @@ from products.models import ShangpinLeixing
 
 
 def _parse_dt(value, end_of_day=False):
+    """解析时间；USE_TZ=False 时必须返回 naive datetime（MySQL）。"""
     if value is None or value == '':
         return None
+    dt = None
     if isinstance(value, datetime):
-        return value
-    text = str(value).strip().replace('/', '-')
-    for fmt in ('%Y-%m-%d %H:%M:%S', '%Y-%m-%d %H:%M', '%Y-%m-%d'):
-        try:
-            dt = datetime.strptime(text, fmt)
-            if fmt == '%Y-%m-%d' and end_of_day:
-                dt = dt.replace(hour=23, minute=59, second=59)
-            if timezone.is_naive(dt):
-                dt = timezone.make_aware(dt, timezone.get_current_timezone())
-            return dt
-        except ValueError:
-            continue
-    return None
+        dt = value
+    else:
+        text = str(value).strip().replace('/', '-')
+        for fmt in ('%Y-%m-%d %H:%M:%S', '%Y-%m-%d %H:%M', '%Y-%m-%d'):
+            try:
+                dt = datetime.strptime(text, fmt)
+                if fmt == '%Y-%m-%d' and end_of_day:
+                    dt = dt.replace(hour=23, minute=59, second=59)
+                break
+            except ValueError:
+                continue
+    if dt is None:
+        return None
+
+    from django.conf import settings
+    use_tz = bool(getattr(settings, 'USE_TZ', False))
+
+    if use_tz:
+        if timezone.is_naive(dt):
+            dt = timezone.make_aware(dt, timezone.get_current_timezone())
+    else:
+        if timezone.is_aware(dt):
+            dt = timezone.make_naive(dt, timezone.get_current_timezone())
+    return dt
 
 
 def _money(val):