title: `as_datetime()` in lubridate package
body: <p>Why there is a strange behavior in the following expressions (why the dates are different):</p>
  <pre><code>today(&quot;America/New_York&quot;)
  [1] &quot;2021-02-28&quot;
  
  as_datetime(today(&quot;America/New_York&quot;), tz = &quot;America/New_York&quot;)
  [1] &quot;2021-02-27 19:00:00 EST&quot;
  </code></pre>
  <p>Also, the local time in New York is 19:09. Is it rounding this time to get &quot;19:00:00&quot;?</p>