title: Convert char to POSIXct
body: <p>this is my date to convert:
  "16:00:00 CT 08 Apr 2018"</p>
  
  <p>and this is my try:</p>
  
  <pre><code>x &lt;- "16:00:00 CT 08 Apr 2018"
  Sys.setlocale(category = "LC_ALL", locale = "English_United States.1252")
  as.POSIXct(x, format = '%H:%M:%S %A %d %b %Y')
  </code></pre>
  
  <p>and it returns NA</p>