diff --git a/backend/src/controllers/syncController.ts b/backend/src/controllers/syncController.ts
index 9cc1cf7..0129a09 100644
--- a/backend/src/controllers/syncController.ts
+++ b/backend/src/controllers/syncController.ts
@@ -138,7 +138,7 @@ export const syncStatus = async (req: AuthRequest, res: Response) => {
       const clientUpdatedAt = clientEndpointMap.get(ep.id);
       if (!clientUpdatedAt) {
         newEndpoints.push({ id: ep.id, name: ep.name });
-      } else if (new Date(ep.updated_at).getTime() > new Date(clientUpdatedAt).getTime()) {
+      } else if (new Date(String(ep.updated_at)).getTime() > new Date(String(clientUpdatedAt)).getTime()) {
         changedEndpoints.push({ id: ep.id, name: ep.name, server_updated_at: ep.updated_at });
       }
     }
@@ -155,7 +155,7 @@ export const syncStatus = async (req: AuthRequest, res: Response) => {
       const clientUpdatedAt = clientFolderMap.get(f.id);
       if (!clientUpdatedAt) {
         newFolders.push({ id: f.id, name: f.name });
-      } else if (new Date(f.updated_at).getTime() > new Date(clientUpdatedAt).getTime()) {
+      } else if (new Date(String(f.updated_at)).getTime() > new Date(String(clientUpdatedAt)).getTime()) {
         changedFolders.push({ id: f.id, name: f.name, server_updated_at: f.updated_at });
       }
     }