diff --git a/web/src/components/Settings/PreferencesSection.tsx b/web/src/components/Settings/PreferencesSection.tsx
index f3f825b6..d9b5c7e2 100644
--- a/web/src/components/Settings/PreferencesSection.tsx
+++ b/web/src/components/Settings/PreferencesSection.tsx
@@ -42,10 +42,10 @@ const PreferencesSection: React.FC<Props> = () => {
 
           for (const memo of memoList) {
             const content = memo.content || "";
-            const createdAt = utils.getDateTimeString(memo.createdTs || Date.now());
+            const createdTs = (memo as any).createdAt || memo.createdTs || Date.now();
 
             try {
-              await memoService.importMemo(content, createdAt);
+              await memoService.importMemo(content, createdTs);
               succeedAmount++;
             } catch (error) {
               // do nth
diff --git a/web/src/services/memoService.ts b/web/src/services/memoService.ts
index cddf2741..4819c21b 100644
--- a/web/src/services/memoService.ts
+++ b/web/src/services/memoService.ts
@@ -129,12 +129,10 @@ const memoService = {
     await api.unpinMemo(memoId);
   },
 
-  importMemo: async (content: string, createdAt: string) => {
-    const createdTs = Math.floor(utils.getTimeStampByDate(createdAt) / 1000);
-
+  importMemo: async (content: string, createdTs: TimeStamp) => {
     await api.createMemo({
       content,
-      createdTs,
+      createdTs: Math.floor(utils.getTimeStampByDate(createdTs) / 1000),
     });
   },
 };