gistfile1.cs

protected XElement TransformDates(XElement inputXml, string schema)
{
    var inputXmlDoc = new XmlDocument();
    inputXmlDoc.Load(inputXml.CreateReader());
    var asm = GetType().Assembly;
    //get namespace from xml
    var xmlString = inputXmlDoc.DocumentElement.OuterXml;
    var xPathXml = new XPathDocument(inputXml.CreateReader());
    var navigator = xPathXml.CreateNavigator();
    navigator.MoveToFollowing(XPathNodeType.Element);
    var namespaces = navigator.GetNamespacesInScope(XmlNamespaceScope.All);
    string nms;
    namespaces.TryGetValue(string.Empty, out nms);
    //namespace
    var ns = new XmlNamespaceManager(inputXmlDoc.NameTable);
    ns.AddNamespace("x", nms);
    //load schema
    var tr = new XmlTextReader(new StringReader(xmlString));
    var vr = new XmlReaderSettings
    {
        ValidationType = ValidationType.Schema
    };
    using (var resource = asm.GetManifestResourceStream(asm.GetManifestResourceNames().First(m => m.EndsWith(schema))))
    {
        using (var r = XmlReader.Create(resource))
        {
            vr.Schemas.Add(nms, r);
        }
        using (var reader = XmlReader.Create(tr, vr))
        {
            reader.MoveToContent();
            while (reader.Read())
            {
                if (reader.NodeType != XmlNodeType.Element)
                    continue;
                var name = reader.Name;
                try
                {
                    if (reader.ValueType != typeof(DateTime))
                        continue;
                    var el = XNode.ReadFrom(reader) as XElement;
                    if (el != null)
                        inputXmlDoc.DocumentElement.SelectSingleNode("//x:" + name, ns).InnerText = DateTime.Parse(el.Value).ToString("ddMMyyyy");
                }
                catch
                {
                }
            }
        }
    }
    return XElement.Parse(inputXmlDoc.OuterXml);
}