Map xs:string to xs:datetime

Remember that situation where you needed to convert a string representation of a DateTime to a valid DataTime using the BizTalk mapper? No? Well, I do. The parsing of the string as a DateTime is not the real problem here. Once you know how the string is formatted it is simply writing a way to parse it, either using substrings or using the DateTime.Parse method. Once you have a DateTime though, you need to format it to be valid according to the XSD spec.