GSON builder with date format

gistfile1.txt

GsonBuilder builder = new GsonBuilder();
        builder.registerTypeAdapter(Date.class, new JsonDeserializer<Date>() {
            DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");
            @Override
            public Date deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context)
                    throws JsonParseException {
                try {
                    return df.parse(json.getAsString());
                } catch (ParseException e) {
                    return null;
                }
            }
        });
        try
        {
        Gson gson = builder.create();