title: How to get Google spreadsheet time zone offset string instead of timezone string?
body: <p>Google sheet spreadsheet have a time zone setting viewed via the File -&gt; Settings menu. see image.
  <a href="https://i.stack.imgur.com/QA2Jz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QA2Jz.png" alt="enter image description here" /></a>
  However following code line</p>
  <pre><code>SpreadsheetApp.getActive().getSpreadsheetTimeZone();
  </code></pre>
  <p>returns: <strong>America/New_York</strong></p>
  <p>I'd like to get using app script the time zone string as it appears in the file setting (<strong>(GMT-5) Eastern Time</strong>) rathen than as it is returned by <code>getSpreadsheetTimeZone()</code>. Is it possible?</p>