<!DOCTYPE html>
<html>
<head>
<title>Der Titel des Dokuments</title>
<style>
table,th,td{border:1px solid #cccccc}
</style>
</head>
<body>
<table >
<tr>
<th>Monat</th>
<th>Datum</th>
</tr>
<tr>
<td>Januar</td>
<td rowspan="2">10.01.2014</td>
</tr>
<tr>
<td>Februar</td>
</tr>
</table>
</body>
</html>