--- old/test/jdk/sun/security/tools/jarsigner/warnings/NoTimestampTest.java	2019-03-13 15:59:23.000000000 +0800
+++ new/test/jdk/sun/security/tools/jarsigner/warnings/NoTimestampTest.java	2019-03-13 15:59:23.000000000 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,6 +27,7 @@
 import java.security.cert.X509Certificate;
 import java.util.Date;
 import java.util.Locale;
+import java.util.TimeZone;
 
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.util.JarUtils;
@@ -59,8 +60,9 @@
     }
 
     private void start() throws Throwable {
-        String timezone = System.getProperty("user.timezone");
+        String timezone = System.getProperty("user.timezone", "UTC");
         System.out.println(String.format("Timezone = %s", timezone));
+        TimeZone.setDefault(TimeZone.getTimeZone(timezone));
 
         // create a jar file that contains one class file
         Utils.createFiles(FIRST_FILE);