有什么好的方法来得到下周三的日期? [英] Is there a good way to get the date of the coming Wednesday?
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问题描述
有什么好的方法来得到下周三的日期?
也就是说,如果今天是星期二,我想获得本周三的日期;如果今天是星期三,我想得到下周三的日期;如果今天是星期四,我想在下周获得星期三的日期。
Is there a good way to get the date of the coming Wednesday? That is, if today is Tuesday, I want to get the date of Wednesday in this week; if today is Wednesday, I want to get the date of next Wednesday; if today is Thursday, I want to get the date of Wednesday in the following week.
谢谢。
推荐答案
基本算法如下:
- 获取当前日期 $ b $ 未来日期)
- 添加差异
- Get the current date
- Get its day of week
- Find its difference with Wednesday
- If the difference is not positive, add 7 (i.e. insist on next coming/future date)
- Add the difference
这里有一个代码段,这与 java.util.Calendar
:
Here's a snippet to show how to do this with java.util.Calendar
:
import java.util.Calendar;
public class NextWednesday {
public static Calendar nextDayOfWeek(int dow) {
Calendar date = Calendar.getInstance();
int diff = dow - date.get(Calendar.DAY_OF_WEEK);
if (!(diff > 0)) {
diff += 7;
}
date.add(Calendar.DAY_OF_MONTH, diff);
return date;
}
public static void main(String[] args) {
System.out.printf(
"%ta, %<tb %<te, %<tY",
nextDayOfWeek(Calendar.WEDNESDAY)
);
}
}
相对于我这里和现在,以上代码段2010年8月18日星期三
。
Relative to my here and now, the output of the above snippet is "Wed, Aug 18, 2010"
.
-
java.util.Calendar
-
java.util.Formatter
- 用于格式化字符串语法
java.util.Calendar
java.util.Formatter
- for the formatting string syntax
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