年龄和周年之间的差异？ [英] Difference between year-of-era and week-based-year?

问题描述

Java 8的 DateTimeFormatter 类有一个方法，即图形（String pattern），可以让您从Az，az字母的字符串中定义格式。这些例子并没有明确y，年龄和Y之间的差异，周年。这是什么？

Java 8's DateTimeFormatter class has a method, ofPattern(String pattern), that lets you define a format from a string of A-z, a-z letters. The examples don't clarify the difference between y, year-of-era and Y, week-based-year. What is it?

Symbol  Meaning                     Presentation      Examples
------  -------                     ------------      -------
 y       year-of-era                 year              2004; 04
 Y       week-based-year             year              1996; 96

推荐答案

这是年周风格的年值日期，如2006W52。
如果有问题的星期跨越年边界，可能会超过年龄值+1或-1。

That's year value for "year-week" style dates, as in 2006W52. It may be off the year-of-era value by +1 or -1 if the week in question straddles year boundary.

请参阅http://en.wikipedia.org/wiki/ISO_8601#Week_dates

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