DateDeserializer.java

public class DateDeserializer implements JsonDeserializer {

    @Override
    public Date deserialize(JsonElement element, Type arg1, JsonDeserializationContext arg2) throws JsonParseException {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");

        try {
            return formatter.parse(element.getAsString());
        } catch (ParseException e) {
            return null;
        }
    }
}