title: Rails 5: Not converting DateTime object timezone correctly
body: <p>This issue has been eating away at me for a while.</p>
  
  <p>I take a date time string:</p>
  
  <pre><code>[14] pry(#&lt;EventsController&gt;)&gt; params[:event][:ended_at]
  =&gt; "05/31/2017 2:00 PM"
  </code></pre>
  
  <p>I convert it to a DateTime object:</p>
  
  <pre><code>pry(#&lt;EventsController&gt;)&gt; to_datetime = DateTime.strptime(params[:event][:ended_at], "%m/%d/%Y %H:%M %p")
  =&gt; Wed, 31 May 2017 14:00:00 +0000
  </code></pre>
  
  <p>If I run the <code>in_time_zone</code> method on the <code>to_datetime</code> object it outputs the wrong time for pacific timezone:</p>
  
  <pre><code>[16] pry(#&lt;EventsController&gt;)&gt; to_datetime.in_time_zone("Pacific Time (US &amp; Canada)")
  =&gt; Wed, 31 May 2017 07:00:00 PDT -07:00
  </code></pre>
  
  <p>It should read "2:00PM" the same as how it is entered.</p>
  
  <p>If I go to google and check to see if "14:00:00 +0000" is the correct entry for PDT time it verifies as correct:</p>
  
  <p><a href="https://imgur.com/a/ZJ80F" rel="nofollow noreferrer">http://imgur.com/a/ZJ80F</a></p>
  
  <p>Any clues about why it's not converting correctly? </p>