diff --git a/src/data/schemas/chat/chat_send_response.ts b/src/data/schemas/chat/chat_send_response.ts
index 74dd4550..d022c9d5 100644
--- a/src/data/schemas/chat/chat_send_response.ts
+++ b/src/data/schemas/chat/chat_send_response.ts
@@ -15,7 +15,8 @@ export const ChatSendResponseSchema = z.object({
   currentMood: z.string().default(""),
   messageId: z.string(),
   isGuest: z.boolean().default(false),
-  timestamp: z.number().default(0),
+  // 函数式 default —— 每次 parse 时**重新**调 Date.now()（后端不返回 timestamp 时用**当下**时间）
+  timestamp: z.number().default(() => Date.now()),
 });
 
 export type ChatSendResponseInput = z.input<typeof ChatSendResponseSchema>;
diff --git a/src/stores/chat/chat-machine.actors.ts b/src/stores/chat/chat-machine.actors.ts
index b09a9bc4..b5d9fb78 100644
--- a/src/stores/chat/chat-machine.actors.ts
+++ b/src/stores/chat/chat-machine.actors.ts
@@ -68,6 +68,7 @@ export const sendMessageHttpActor = fromPromise<
     messageId: result.data.messageId,
     timestamp: result.data.timestamp,
   });
+
   const reply = sendResponseToUiMessage(result.data);
   console.log("[chat-machine] sendMessageHttpActor done", {
     replyContentLength: reply.content.length,