title: Java 8 time zone ZoneRulesException: Unknown time-zone ID: EST
body: <p>"EST" is one of the timeZone id from TimeZone.getAvailableIDs();</p>
  
  <p>but</p>
  
  <pre><code>TimeZone.getAvailableIDs();  // contains EST
  ZoneId.of("EST")
  </code></pre>
  
  <p>java.time.zone.ZoneRulesException: Unknown time-zone ID: EST</p>