public class DateTimeConverter implements JsonSerializer<DateTime>, JsonDeserializer<DateTime>
{
    private static final DateTimeFormatter DATE_FORMAT = ISODateTimeFormat.dateHourMinuteSecondMillis();
    @Override
    public JsonElement serialize(DateTime src, Type typeOfSrc, JsonSerializationContext context)
    {
        final DateTimeFormatter fmt = ISODateTimeFormat.dateHourMinuteSecondMillis();
        return new JsonPrimitive(fmt.print(src));
    }


    @Override
    public DateTime deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException
    {
        final String dateAsString = json.getAsString();
        System.out.println(dateAsString);
        if (json.isJsonNull() || dateAsString.length()==0)
        {
            return null;
        }
        else
        {
            return DATE_FORMAT.parseDateTime(json.getAsString());
        }
    }
}