diff --git a/backend/scheduler.py b/backend/scheduler.py
index ab2a52b..0b75ba7 100644
--- a/backend/scheduler.py
+++ b/backend/scheduler.py
@@ -63,7 +63,7 @@ class LotteryScheduler:
             db = SessionLocal()
             try:
                 # 判断彩种
-                weekday = datetime.datetime.now().isoweekday()
+                weekday = datetime.now().isoweekday()
                 if weekday == 5:
                     logger.info("周五休息，不推送推荐")
                     return
@@ -80,7 +80,7 @@ class LotteryScheduler:
                     title = "你好，帮忙买下双色球。"
                     dlt_append = False
                 # 生成batch_id
-                today = datetime.datetime.now().strftime('%Y%m%d')
+                today = datetime.now().strftime('%Y%m%d')
                 batch_id = f"{today}-{random.randint(1000, 9999)}"
                 # 推荐4注（集成预测+智能选号补足）
                 service = PredictionService(db)
diff --git a/backend/update_lottery.py b/backend/update_lottery.py
index c0ed6da..6e77507 100644
--- a/backend/update_lottery.py
+++ b/backend/update_lottery.py
@@ -258,7 +258,7 @@ class LotteryUpdater:
     def update_bet_issues_by_date(self, lottery_type: str):
         """
         根据投注日期更新期号
-        查找相同日期的投注记录，将期号设置为当天开奖的期号
+        查找投注记录，将期号设置为投注日期之后最近的开奖期号
         """
         try:
             db = self.SessionLocal()
@@ -280,16 +280,29 @@ class LotteryUpdater:
                 # 获取投注日期
                 bet_date = bet.bet_time.date()
 
-                # 查找相同日期的开奖记录
+                # 查找投注日期之后最近的开奖记录
+                # 先尝试找投注当天的开奖
                 draw = db.query(LotteryModel).filter(
                     LotteryModel.open_time == bet_date).first()
 
+                # 如果投注当天没有开奖，找投注日期之后最近的开奖
+                if not draw:
+                    draw = db.query(LotteryModel).filter(
+                        LotteryModel.open_time > bet_date
+                    ).order_by(LotteryModel.open_time.asc()).first()
+
+                # 如果还是没找到，找投注日期之前最近的开奖（兜底逻辑）
+                if not draw:
+                    draw = db.query(LotteryModel).filter(
+                        LotteryModel.open_time <= bet_date
+                    ).order_by(LotteryModel.open_time.desc()).first()
+
                 if draw:
                     # 更新投注记录的期号
                     old_issue = bet.issue
                     bet.issue = draw.issue
                     logger.debug(
-                        f"更新投注记录 ID {bet.id}: 期号 {old_issue} -> {draw.issue} (日期匹配: {bet_date})")
+                        f"更新投注记录 ID {bet.id}: 期号 {old_issue} -> {draw.issue} (投注日期: {bet_date}, 开奖日期: {draw.open_time})")
                 else:
                     logger.debug(
                         f"投注记录 ID {bet.id} 的日期 {bet_date} 暂无开奖数据，期号保持 PENDING")