title: Why do these twix range tests fail?
body: <p>I'm using the twix library to check for clashing date ranges, yet nothing I do seems to trigger the checks. For example, here is the test I've been using:</p>
  
  <pre><code>eventTimeRange = moment("18-01-2018 02:00").twix("18-01-2018 03:00");
  newEventTimeRange = moment("18-01-2018 02:00").twix("18-01-2018 03:00");
  console.log(eventTimeRange.overlaps(newEventTimeRange)) //false
  console.log(eventTimeRange.engulfs(newEventTimeRange)) //false
  console.log(eventTimeRange.equals(newEventTimeRange)) //false
  </code></pre>
  
  <p>What am I doing wrong here?</p>