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

那么岁月呢？

Answer 1

这里的根本问题是您开始使用 Duration，IMO。 Duration 只是几毫秒...考虑其中的年数有点麻烦，因为一年是 365 天或 366 天（甚至取决于日历系统）。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.

那么您正在调用 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.

与其从 Duration 创建句点，不如直接从 DateTime 和 "now" 创建句点，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());

joda time PeriodFormatter 不打印年份

joda time PeriodFormatter does not print years

java

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