java - joda time periodFormatter 不打印年份

Question

我有一个格式化程序如下:

 private static PeriodFormatter formatter = new PeriodFormatterBuilder()
            .printZeroNever()
            .appendYears().appendSuffix(" years ")
            .appendMonths().appendSuffix(" months ")
            .appendWeeks().appendSuffix(" weeks ")
            .appendDays().appendSuffix(" days ")
            .appendHours().appendSuffix(" hours ")
            .appendMinutes().appendSuffix(" minutes ")
            .appendSeconds().appendSuffix(" seconds")
            .toFormatter();

并按如下方式使用它:

        DateTime dt = DateTime.parse("2010-06-30T01:20");
        Duration duration = new Duration(dt.toInstant().getMillis(), System.currentTimeMillis());

        Period period = duration.toPeriod().normalizedStandard(PeriodType.yearMonthDayTime());
        formatter.print(period);

输出是:

2274 days 13 hours 59 minutes 39 seconds

那么岁月在哪里呢？

Answer 1

这里的根本问题是您首先使用Duration，IMO。 Duration 只是几毫秒...考虑其中的年数有点麻烦，因为一年要么是 365 天，要么是 366 天(甚至这取决于日历系统)。这就是为什么 toPeriod method you're calling明确表示:

Only precise fields in the period type will be used. Thus, only the hour, minute, second and millisecond fields on the period will be used. The year, month, week and day fields will not be populated.

那么您调用normalizedStandard(PeriodType)其中包括:

The days field and below will be normalized as necessary, however this will not overflow into the months field. Thus a period of 1 year 15 months will normalize to 2 years 3 months. But a period of 1 month 40 days will remain as 1 month 40 days.

不要从 Duration 创建周期，而是直接从 DateTime 和“now”创建，例如

DateTime dt = DateTime.parse("2010-06-30T01:20");
DateTime now = DateTime.now(); // Ideally use a clock abstraction for testability
Period period = new Period(dt, now, PeriodType.yearMonthDayTime());