diff --git a/karma.conf.js b/karma.conf.js
index 83306fa..00742da 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -1,14 +1,13 @@
-/* Copyright 2019 The Chromium Authors. All Rights Reserved.
- *
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
+// Copyright 2019 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 process.env.CHROME_BIN = require('puppeteer').executablePath();
 
 module.exports = function(config) {
   const isDebug = process.argv.some((arg) => arg === '--debug');
   const coverage = process.argv.some((arg) => arg === '--coverage');
+  process.env.TZ = 'America/Los_Angeles';
   config.set({
 
     // base path that will be used to resolve all patterns (eg. files, exclude)