title: Formatting ISO time with Luxon
body: <p>Using <strong>Luxon JS</strong>, I've been trying to format datetime to output in a certain format, using the native <strong>toISO</strong> function:</p>
  <p>This is what I <em>get</em>:</p>
  <pre><code>&quot;2018-08-25T09:00:40.000-04:00&quot;
  </code></pre>
  <p>And this is what I <em>want</em>:</p>
  <pre><code>&quot;2018-08-25T13:00:40.000Z&quot;
  </code></pre>
  <p>I know that they are both equivalent in terms of unix time and mean the same thing except in a different format, I just want to be able to out the second string rather than the first. I looked through the Luxon docs but was unable to find any arguments/options that would give me what I need.</p>