调整时区，

message_sign/main.py

@@ -194,6 +194,11 @@ class SignInSystem:
         streak = 0
         if user_record and user_record['sign_stat']:
             last_sign_date = user_record['sign_stat'].replace(hour=0, minute=0, second=0, microsecond=0)
+            # 确保 sign_stat 和 today_start 是同一时区对象
+            if isinstance(last_sign_date, datetime) and last_sign_date.tzinfo is None:
+                last_sign_date = pytz.timezone(self.timezone).localize(last_sign_date)
+            print(f"last_sign_date:{last_sign_date}")
+            print(f"yesterday:{yesterday}")
             if last_sign_date == yesterday:
                 streak = user_record['signin_streak'] + 1
             else: