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public class Util {
    public static String displayTime(long millis){
        long second = (millis / 1000) % 60;
        long minute = (millis / (1000 * 60)) % 60;
        long hour = (millis / (1000 * 60 * 60)) % 24;
        return String.format(Locale.getDefault(),"%02d:%02d:%02d:%d", hour, minute, second, millis);
    }

    public static String displayTime(Date startDate){
        long diffDate = (new Date()).getTime() - startDate.getTime();
        return displayTime(diffDate);
    }
}