title: Parse date and time from string with time zone using Arrow
body: <p>I have</p>
  
  <pre><code>import arrow
  s = '2015/12/1 19:00:00'
  tz = 'Asia/Hong_Kong'
  </code></pre>
  
  <p>How can I parse this with Arrow such that I get an Arrow object with the time zone <code>tz</code>?  The following defaults to UTC time.</p>
  
  <pre><code>In [30]: arrow.get(s, 'YYYY/M/D HH:mm:ss')
  Out[30]: &lt;Arrow [2015-12-01T19:00:00+00:00]&gt;
  </code></pre>
  
  <p>I know the <code>.to</code> function but that converts a time zone and but doesn't allow me to change to time zone.</p>