p></td>
    </tr>
    <tr>
      <th>date2</th>
      <td><p>A date-time object</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p>a numeric value representing the number of years between
<code>date1</code> and <code>date2</code>.</p>
    <h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>

    <p>where:</p>
<ul>
<li><p>\(d_1\) is the remaining days in the first date's year including
both the start an