Update Metadata from MP3 File in Java

public class UpdatingMetadata {
    public static void run() {
        Date threeDaysAgo = new Date(System.currentTimeMillis() - TimeUnit.DAYS.toMillis(3));
        try (Metadata metadata = new Metadata("input.mp3")) {
                // Update the file creation date/time if the existing value is older than 3 days
                int affected = metadata.updateProperties(new ContainsTagSpecification(Tags.getTime().getCreated()).and(
                        new OfTypeSpecification(MetadataPropertyType.DateTime)).and(
                        new UpdatingMetadata().new DateBeforeSpecification(threeDaysAgo)), new PropertyValue(new Date()));

                System.out.println(String.format("Affected properties: %s", affected));

                metadata.save("output.mp3");
        }
    }

    // Define your own specifications to filter metadata properties
    public class DateBeforeSpecification extends Specification {
        public DateBeforeSpecification(Date date) {
            setValue(date);
        }

        public final Date getValue() {
            return auto_Value;
        }

        private void setValue(Date value) {
            auto_Value = value;
        }

        private Date auto_Value;

        public boolean isSatisfiedBy(MetadataProperty candidate) {
            Date date = candidate.getValue().toClass(Date.class);
            if (date != null) {
                return date.before(getValue());
            }
            return false;
        }
    }
}