you don't need to use the Joda time library as the standard java one can be used it is an option though
using the same general structure as above, define your date format then try to parse the value into that format, if the data doesn't adhere to the format the exception is thrown
import com.eviware.soapui.support.XmlHolder
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
def dateFieldValue = context.expand( 'INSERT RESPONSE ELEMENT HERE' )
assert dateFieldValue != null
log.info dateFieldValue
try {date = new Date().parse('dd/MM/yyyy', dateFieldValue)
} catch (Exception e) {
assert false
}
log.info "Expected date format = 'dd/MM/yyyy', value found = '"+dateFieldValue+"'"
assert true