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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.convert;

import java.sql.Time;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Date;

import org.directwebremoting.ConversionException;
import org.directwebremoting.extend.AbstractConverter;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.NonNestedOutboundVariable;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;
import org.directwebremoting.extend.ProtocolConstants;

/**
 * An implementation of Converter for Dates.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DateConverter extends AbstractConverter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertInbound(java.lang.Class, org.directwebremoting.InboundVariable, org.directwebremoting.InboundContext)
     */
    public Object convertInbound(Class paramType, InboundVariable data) throws ConversionException
    {
        if (data.isNull())
        {
            return null;
        }

        String value = data.getValue();

        // If the text is null then the whole bean is null
        if (value.trim().equals(ProtocolConstants.INBOUND_NULL))
        {
            return null;
        }

        try
        {
            long millis = 0;
            if (value.length() > 0)
            {
                millis = Long.parseLong(value);
            }

            Date date = new Date(millis);
            if (paramType == Date.class)
            {
                return date;
            }
            else if (paramType == java.sql.Date.class)
            {
                return new java.sql.Date(date.getTime());
            }
            else if (paramType == Time.class)
            {
                return new Time(date.getTime());
            }
            else if (paramType == Timestamp.class)
            {
                return new Timestamp(date.getTime());
            }
            else if (paramType == Calendar.class)
            {
                Calendar cal = Calendar.getInstance();
                cal.setTime(date);
                return cal;
            }
            else
            {
                throw new ConversionException(paramType);
            }
        }
        catch (ConversionException ex)
        {
            throw ex;
        }
        catch (Exception ex)
        {
            throw new ConversionException(paramType, ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object data, OutboundContext outctx) throws ConversionException
    {
        long millis;

        if (data instanceof Calendar)
        {
            Calendar cal = (Calendar) data;
            millis = cal.getTime().getTime();
        }
        else if (data instanceof Date)
        {
            Date date = (Date) data;
            millis = date.getTime();
        }
        else
        {
            throw new ConversionException(data.getClass());
        }

        return new NonNestedOutboundVariable("new Date(" + millis + ")");
    }
}