diff --git a/site/src/testHelpers/entities.ts b/site/src/testHelpers/entities.ts
index 76de23d2dacf4..5954c69a8de4f 100644
--- a/site/src/testHelpers/entities.ts
+++ b/site/src/testHelpers/entities.ts
@@ -112,7 +112,7 @@ export const MockWorkspaceAutostopEnabled: TypesGen.UpdateWorkspaceAutostartRequ
 export const MockWorkspaceBuild: TypesGen.WorkspaceBuild = {
   after_id: "",
   before_id: "",
-  created_at: new Date().toDateString(),
+  created_at: new Date().toString(),
   id: "test-workspace-build",
   initiator_id: "",
   job: MockProvisionerJob,