<td><p>To determine the formatting of the last value in <code>x</code>,
the length of the last period has to be specified. If <code>NULL</code> the
function guesses based on the interval of <code>x</code>.
Specify in days when <code>x</code> is <code>Date</code>, or in seconds when <code>x</code> is
<code>POSIXct</code> or <code>POSIXlt</code>.</p></td>
    </tr>
    </table>
    
    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p>A character vector showing the inter