<body>
  <div>
    <table style="border:1px solid black;">
    <tr>
      <td>Pierwsza data (DD/MM/RRRR)</td>
      <td><input type="text" id="tfD1" /></td>
    </tr>
    <tr>
      <td>Druga data (DD/MM/RRRR)</td>
      <td><input type="text" id="tfD2" /></td>
    </tr>
    <tr>
      <td colspan="2" style="text-align:center;">
      <input type="button" value="Oblicz" onclick="btnObliczClick();">
      </td>
    </tr>
    <tr>
      <td colspan="2" style="text-align:center;" id="wynik">
      </td>
    </tr>
    </table>
  </div>
</body>
