void WriteModificationDate(DateTimeOffset dateTime)
{
xmlWriter.WriteStartElement("ModifyDate");
// Date
xmlWriter.WriteStartElement("Date");
xmlWriter.WriteString(dateTime.ToString("yyyy-MM-dd"));
xmlWriter.WriteEndElement();
// Time
xmlWriter.WriteStartElement("Clock");
xmlWriter.WriteString(dateTime.ToString("HH:mm"));
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
}