title: How to detect an ambiguous DST overlap?
body: <p>When daylight saving ends the clock goes back 1 hour. This means there will be 2 <code>01:30 AM</code> on Novermber 5, 2017. So here is how it will work</p>
  
  <pre><code>01:59:58
  01:59:59
  01:00:00
  01:00:01
  </code></pre>
  
  <p>As you can see when the time approaches 02:00:00 it will go back 1 hour to 01:00:00. This means there will be an overlap of one hour on November 5. I need to detect if the time given is within an overlap period?</p>