DateAdapterForDay

public class DateAdapterForDay extends XmlAdapter<String, Date> {

    private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");  

    @Override
    public String marshal(Date v) throws Exception {
        if (null == v) {
            return null;
        }
        return dateFormat.format(v);
    }  

    @Override
    public Date unmarshal(String v) throws Exception {
        if (!StringUtil.isNotBlank(v)) {
            return null;
        }
        return dateFormat.parse(v);
    }  

}