diff --git a/api/@ohos.data.unifiedDataChannel.d.ts b/api/@ohos.data.unifiedDataChannel.d.ts
index 162cf9b92..edc3f3ec8 100644
--- a/api/@ohos.data.unifiedDataChannel.d.ts
+++ b/api/@ohos.data.unifiedDataChannel.d.ts
@@ -115,7 +115,7 @@ declare namespace unifiedDataChannel {
      * @atomicservice
      * @since 12
      */
-    timestamp?: Date;
+    readonly timestamp?: Date;
     /**
      * Indicates the scope of clipboard data which can be used.
      * If it is not set or is incorrectly set, The default value is CrossDevice.