I think maybe the core issue is described here <http://stackoverflow.com/questions/21663262/xpath-query-filtering-by-date> , with respect to XPath functions. I think the suggestion to use the XML reader code that works to get the whole string and then process that property in some way is a good idea. While I prefer C++ CAs, maybe the WixPsExtension would help you with a PowerShell script or some other script approach, if the limitations are acceptable.
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