title: lubridate::as_datetime() fails when as.POSIXct() works?
body: <p>Could someone explain why <code>lubridate::as_datetime()</code> fails here, but <code>as.POSIXct()</code> works?</p>
  <pre><code>&gt; as.POSIXct(&quot;2020-10-27 20:25&quot;)
  [1] &quot;2020-10-27 20:25:00 CDT&quot;
  
  &gt; lubridate::as_datetime(&quot;2020-10-27 20:25&quot;)
  [1] NA
  Warning message:
  All formats failed to parse. No formats found. 
  </code></pre>