时间间隔格式化

public class DurationFormat {

    public static String format(long durationMilliseconds) {
        // milliseconds
        long iterator = durationMilliseconds;
        long milliseconds = iterator % 1000;
        // seconds
        iterator /= 1000;
        long seconds = iterator % 60;
        // minutes
        iterator /= 60;
        long minutes = iterator % 60;
        // hours
        iterator /= 60;
        long hours = iterator % 24;
        // days
        iterator /= 24;
        long days = iterator;

        StringBuilder sb = new StringBuilder(64);
        if (days != 0) {
            sb.append(days).append(days == 1 ? " day " : " days ");
        }
        if (hours != 0) {
            sb.append(hours).append(hours == 1 ? " hour " : " hours ");
        }
        if (minutes != 0) {
            sb.append(minutes).append(minutes == 1 ? " minute " : " minutes ");
        }
        if (seconds != 0) {
            sb.append(seconds).append(seconds == 1 ? " second " : " seconds ");
        }
        if ((milliseconds != 0) || (sb.length() == 0)) {
            sb.append(milliseconds).append(milliseconds == 1 ? " millisecond " : " milliseconds ");
        }
        // remove last space
        String result = sb.substring(0, sb.length() - 1);
        return result;
    }

}

用例：

public class Test {

    public static void main(String[] args) {

        System.out.println(DurationFormat.format(Duration.ofDays(1).getSeconds() * 1000));
        System.out.println(DurationFormat.format(Duration.ofDays(2).getSeconds() * 1000));
        System.out.println(DurationFormat.format(Duration.ofHours(1).getSeconds() * 1000));
        System.out.println(DurationFormat.format(Duration.ofHours(2).getSeconds() * 1000));
        System.out.println(DurationFormat.format(Duration.ofMinutes(1).getSeconds() * 1000));
        System.out.println(DurationFormat.format(Duration.ofMinutes(2).getSeconds() * 1000));
        System.out.println(DurationFormat.format(Duration.ofSeconds(1).getSeconds() * 1000));
        System.out.println(DurationFormat.format(Duration.ofSeconds(2).getSeconds() * 1000));
        System.out.println(DurationFormat.format(0));
        System.out.println(DurationFormat.format(1));
        System.out.println(DurationFormat.format(2));

        System.out.println(DurationFormat.format(10000L));
        System.out.println(DurationFormat.format(100000L));
        System.out.println(DurationFormat.format(1000000L));
        System.out.println(DurationFormat.format(10000000L));
        System.out.println(DurationFormat.format(100000000L));
        System.out.println(DurationFormat.format(1000000002L));
    }

}

效果：

1 day
2 days
1 hour
2 hours
1 minute
2 minutes
1 second
2 seconds
0 milliseconds
1 millisecond
2 milliseconds
10 seconds
1 minute 40 seconds
16 minutes 40 seconds
2 hours 46 minutes 40 seconds
1 day 3 hours 46 minutes 40 seconds
11 days 13 hours 46 minutes 40 seconds 2 milliseconds