</code> is already of POSIXct or POSIXt class, the code verifies that the number of elements on it be equal to the number of elements in <code>x</code></p></dd>

  <dt>date.fmt</dt>
<dd><p>character indicating the format in which the dates are stored in <code>dates</code>, By default <code>date.fmt=%Y-%m-%d %H:%M:%S</code>. See <code>format</code> in <code><a href="https://rdrr.io/r/base/as.Date.html" class="external-link">as.Date</a></code>. <br>
ONLY required when <code>class(dates)=="factor"</code> or <c