diff --git a/test.html b/test.html
index 36e74a67..d1d7c730 100644
--- a/test.html
+++ b/test.html
@@ -2,3 +2,8 @@
 <iframe src="https://testsafebrowsing.appspot.com/"></iframe>
 
 <a href="https://testsafebrowsing.appspot.com/">https://testsafebrowsing.appspot.com/</a>
+
+<script>
+  alert(window.Intl.DateTimeFormat().resolvedOptions().timeZone);
+  alert(Date().toLocaleString('en-us',{timeZoneName:'long'}));
+</script>