title: moment-timezone America/Sao_Paulo wrong timezone offset
body: <p>I'm getting an error using <code>moment-timezone</code> with <code>America/Sao_Paulo</code> trying to parse date with <code>America/Sao_Paulo</code> offset. I've created this code:</p>
  
  <pre><code>const date = "2019-1-1 23:30";
  const format = "YYYY-M-D HH:mm";
  const timezone = "America/Sao_Paulo";
  const dateMoment = moment.tz(date, format, timezone);
  </code></pre>
  
  <p>The output of <code>dateMoment</code> is <code>2019-01-01T23:30:00-02:00</code> but I expect <code>2019-01-01T23:30:00-03:00</code>, since <code>America/Sao_Paulo</code> has offset <code>-03:00</code>.</p>
  
  <p>Am I missing something or did I initialize <code>dateMoment</code> wrong?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>const date = "2019-1-1 23:30";
  const format = "YYYY-M-D HH:mm";
  const timezone = "America/Sao_Paulo";
  const dateMoment = moment.tz(date, format, timezone);
  
  console.log(dateMoment.format());
  console.log(moment.tz(timezone).format('Z'));</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.6/moment.min.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="http://momentjs.com/downloads/moment-timezone-with-data.js"&gt;&lt;/script&gt;</code></pre>
  </div>
  </div>
  </p>