Generic Web Service and xmlgregoriancalendar date format

Hi Jon, Unfortunately, I get the same error passing an xml style date value like: 

<startDate>2013-08-06</startDate> OR
<startTime>2013-08-07T05:51:37</startTime>

No matter what value I pass back, I get the error: "java.text.ParseException: Unparseable date:" .I can get the web service to respond correctly in SOAP UI, but just can't work out if it's even possible to pass a date value to the wsdl using the generic soap client at all. Thanks for your suggestion though.

Hopefully someone has succesfully passed a xmlgregoriancalendar date format value back using this node?