 to the ending DateTime defined by <code>from</code>.</p></dd>

  <dt>dates</dt>
<dd><p>numeric, factor, POSIXct or POSIXt object indicating how to obtain the dates and times for each column of <code>x</code> (e.g., gauging station) <br>
If <code>dates</code> is a number, it indicates the index of the column in <code>x</code> that stores the date and times <br>
If <code>dates</code> is a factor, it is converted into POSIXct class, using the date format specified by <code>date.fmt</code>  <br>
If <code>dates