title: get time in a specified timezone using moment.js
body: <pre><code>Thu Apr 06 2018 09:24:00 GMT+0530 (India Standard Time)
  </code></pre>
  
  <p>I want to get this date in ISO format.(Not just in IST timezone, but other timezones as well). If I use <code>.toISOString()</code> method of Date it converts the date to UTC. I want to get the date in ISO format but retain the date in the given timezone. How can I do that?</p>