diff --git a/kipina-codebench/benchmark.mjs b/kipina-codebench/benchmark.mjs
index 5bc6f03..297e072 100644
--- a/kipina-codebench/benchmark.mjs
+++ b/kipina-codebench/benchmark.mjs
@@ -29,7 +29,7 @@ const OLLAMA_URL = arg('ollama', process.env.OLLAMA_URL || 'http://127.0.0.1:114
 const HUB_URL = arg('hub', '');
 const FILTER_MODELS = arg('models', '');
 const SCENARIO_FILTER = arg('scenarios', 'default');
-const TIMESTAMP = new Date().toISOString().replace(/[:.]/g, '-').slice(0, 16);
+const TIMESTAMP = new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19);
 const OUTPUT_DIR = arg('output', `/tmp/kipina-benchmark/${TIMESTAMP}`);
 const RESULTS_DIR = join(__dirname, 'results');
 const THINK_MODE = args.includes('--think');