s"></a> Arguments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>this_date</th>
      <td><p>Date; formatted as Date, POSIXct, or POSIXlt</p></td>
    </tr>
    <tr>
      <th>daytime</th>
      <td><p>character; either "beginning" or "end" so that the function 
knows which hours to set if needed</p></td>
    </tr>
    <tr>
      <th>timeZoneID</th>
      <td><p>character; a string indicating the timezone that should be used. 
The 