title: How to get default ZoneOffset in Java 8?
body: <p>With Java 8 we know use <code>ZoneId.default()</code> can get system default <code>ZoneId</code>, but how to get default <code>ZoneOffset</code>?</p>
  <p>I see that a <code>ZoneId</code> has some &quot;rules&quot; and each rule has a <code>ZoneOffset</code>, is that means a <code>ZoneId</code> may have more than one <code>ZoneOffset</code>?</p>