为什么 Java Calendar set(int year, int month, int date) 没有

Why Java Calendar set(int year, int month, int date) not returning correct date?(为什么 Java Calendar set(int year, int month, int date) 没有返回正确的日期?)

问题描述

根据文档，日历 set() 是:

According to doc, calendar set() is:

http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Calendar.html#set%28int,%20int,%20int%29

set(int year, int month, int date) 
Sets the values for the calendar fields YEAR, MONTH, and DAY_OF_MONTH.

代码:

Calendar c1 = GregorianCalendar.getInstance();
c1.set(2000, 1, 30);  //January 30th 2000
Date sDate = c1.getTime();

System.out.println(sDate);

输出:

Wed Mar 01 19:32:21 JST 2000

为什么不是 1 月 30 日???

推荐答案

1 月是二月.2 月 30 日改为 3 月 1 日.您应该为月份设置 0.最好是使用 Calendar 中定义的常量:

1 for month is February. The 30th of February is changed to 1st of March. You should set 0 for month. The best is to use the constant defined in Calendar:

c1.set(2000, Calendar.JANUARY, 30);

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