How to map javax.xml.datatype.XMLGregorianCalendar to java.util.Calendar

Hi ,
How to map javax.xml.datatype.XMLGregorianCalendar to java.util.Calendar so that i can use pass String parameter in YYYY-MM-DD format to my Web service.
I generated the schema classes using Jaxb 2.1.5.
Please give suggestion
Thanks in Advance.

toGregorianCalendar().getTime()

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