Fix Admin Interface

frontend/src/pages/admin/AdminCatalogPage.tsx

@@ -958,6 +958,16 @@ export const AdminCatalogPage: React.FC = () => {
     }
   }, [canViewLevel, currentLevelRequirement.message, selection]);
 
+  const formatDateValue = useCallback((value?: string) => {
+    if (!value) {
+      return '—';
+    }
+    const date = new Date(value);
+    return Number.isNaN(date.valueOf())
+      ? '—'
+      : date.toLocaleDateString();
+  }, []);
+
   const columns = useMemo<GridColumn<CatalogRow>[]>(() => {
     const baseColumns: GridColumn<CatalogRow>[] = [
       {
@@ -974,14 +984,14 @@ export const AdminCatalogPage: React.FC = () => {
         headerName: 'Created',
         sortable: true,
         renderCell: (row) =>
-          new Date(row.createdAt).toLocaleDateString(),
+          formatDateValue(row.createdAt),
       },
       {
         field: 'updatedAt',
         headerName: 'Updated',
         sortable: true,
         renderCell: (row) =>
-          new Date(row.updatedAt).toLocaleDateString(),
+          formatDateValue(row.updatedAt),
       },
       {
         field: 'actions',
@@ -1041,7 +1051,7 @@ export const AdminCatalogPage: React.FC = () => {
     ];
 
     return baseColumns;
-  }, [handleDeleteSingle, handleDrillDown, openEditDialog, selection.level]);
+  }, [formatDateValue, handleDeleteSingle, handleDrillDown, openEditDialog, selection.level]);
 
   const renderTree = useCallback(
     (nodes: TreeNode[], depth = 0): React.ReactNode =>