title: Parse Date string to datetime with timezone
body: <p>I have a string:</p>
  <pre><code>r = 'Thu Dec 17 08:56:41 CST 2020'
  </code></pre>
  <p>Here CST represent China central time('Asia/Shanghai'). I wanted to parse it to datetime...I am doing something like</p>
  <pre><code>from dateparser import parse
  r1 = parse(r)
  </code></pre>
  <p>Which is giving me r1 as:</p>
  <pre><code>2020-12-17 08:56:41-06:00
  </code></pre>
  <p>And I am also doing this</p>
  <pre><code>r2 = r1.replace(tzinfo=pytz.timezone(&quot;Asia/Shanghai&quot;))
  </code></pre>
  <p>And this is giving me r2 as:</p>
  <pre><code> 2020-12-17 08:50:41+08:00
  </code></pre>
  <p>There is 6 min lag in r2 can someone tell me why is that? And how to correctly transfer my raw string r1 to desired r2 which is:</p>
  <pre><code>2020-12-17 08:56:41 in Asia/Shanghai timezone
  </code></pre>
  <p>Thanks</p>