diff --git a/im-center-api/src/main/java/cn/axzo/im/center/api/vo/resp/GroupMessagePageQueryResponse.java b/im-center-api/src/main/java/cn/axzo/im/center/api/vo/resp/GroupMessagePageQueryResponse.java
index 307d253..7ae641a 100644
--- a/im-center-api/src/main/java/cn/axzo/im/center/api/vo/resp/GroupMessagePageQueryResponse.java
+++ b/im-center-api/src/main/java/cn/axzo/im/center/api/vo/resp/GroupMessagePageQueryResponse.java
@@ -58,7 +58,7 @@ public class GroupMessagePageQueryResponse {
     /**
      * 发送时间
      */
-    private Date sendTime;
+    private Long sendTime;
     /**
      * 消息体. 具体格式根据messageType来定, 字段参考云信文档的body部分: https://doc.yunxin.163.com/messaging/server-apis/DE0MTk0OTY?platform=server#%E5%8E%86%E5%8F%B2%E6%B6%88%E6%81%AF%E6%9F%A5%E8%AF%A2%E8%BF%94%E5%9B%9E%E7%9A%84%E6%B6%88%E6%81%AF%E6%A0%BC%E5%BC%8F%E8%AF%B4%E6%98%8E
      */