Java SimpleDateFormat 将日期移动一年

Question

我得到的结果很奇怪，我无法理解。

public class Test {

  private static DateFormat df = new SimpleDateFormat("dd.MM.YYYY HH:mm");

  public static void main(String[] args) {
    Date d = new Date(1356912000000L);
    System.out.println(d);
    System.out.println(df.format(d));
  }  
}

给出输出：

Mon Dec 31 01:00:00 CET 2012
31.12.2013 01:00

我认为这可能是语言环境的一些问题，但这是整整一年的转变！任何人都可以解释为什么它以这种方式执行吗？

Answer 1

而不是：

"dd.MM.YYYY HH:mm"

使用：

"dd.MM.yyyy HH:mm"

Answer 2

YYYY 是周年，不是日历年。你想要 yyyy 代替。这是 Java 的相关详细信息：

Week Of Year and Week Year

Values calculated for the WEEK_OF_YEAR field range from 1 to 53. The first week of a calendar year is the earliest seven day period starting on getFirstDayOfWeek() that contains at least getMinimalDaysInFirstWeek() days from that year. It thus depends on the values of getMinimalDaysInFirstWeek(), getFirstDayOfWeek(), and the day of the week of January 1. Weeks between week 1 of one year and week 1 of the following year (exclusive) are numbered sequentially from 2 to 52 or 53 (except for year(s) involved in the Julian-Gregorian transition).

The getFirstDayOfWeek() and getMinimalDaysInFirstWeek() values are initialized using locale-dependent resources when constructing a GregorianCalendar. The week determination is compatible with the ISO 8601 standard when getFirstDayOfWeek() is MONDAY and getMinimalDaysInFirstWeek() is 4, which values are used in locales where the standard is preferred. These values can explicitly be set by calling setFirstDayOfWeek() and setMinimalDaysInFirstWeek().

A week year is in sync with a WEEK_OF_YEAR cycle. All weeks between the first and last weeks (inclusive) have the same week year value. Therefore, the first and last days of a week year may have different calendar year values.

For example, January 1, 1998 is a Thursday. If getFirstDayOfWeek() is MONDAY and getMinimalDaysInFirstWeek() is 4 (ISO 8601 standard compatible setting), then week 1 of 1998 starts on December 29, 1997, and ends on January 4, 1998. The week year is 1998 for the last three days of calendar year 1997. If, however, getFirstDayOfWeek() is SUNDAY, then week 1 of 1998 starts on January 4, 1998, and ends on January 10, 1998; the first three days of 1998 then are part of week 53 of 1997 and their week year is 1997.

Java SimpleDateFormat 将日期移动一年

Java SimpleDateFormat shifts Date by one year

java

date

type-conversion

simpledateformat

Week Of Year and Week Year