Sayler91,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<table>
<tr>
<th>Обращение:</th>
<td>
<span id="DATA" xmlpathvalue="//Information/Who">12.11.1956</span></td>
<td>
<span id="_DATA" class="PrintFill" xmlpathvalue="//New_Information/Who">111256789</span></td>
</tr>
</table>
<input name="" type="button" value="test" onclick="test();">
<script>
function test() {
var a = document,
b = a.getElementById("DATA"),
a = a.getElementById("_DATA");
a.style.backgroundColor = b.textContent == a.textContent.replace(/(\d{2})(\d{2})(\d{2})(\d+)/, "$2.$1.19$3") ? "green" : "red";
}
</script>
</body>
</html>
учите
Регулярные выражения