按周数获取日期范围c# [英] Get Date Range by week number c#

问题描述

可能重复:
在 .net 中，了解周数如何获取工作日日期?

你好，

我有一个问题要问你们.如何获取给定周数的日期范围.

I've got a question for ya'll. How do i get the date range of a given week number.

例如:如果我进入第 12 周，输出应该是:

For example: If I enter week 12 the output should be:

21-03-2011
22-03-2011
23-03-2011
24-03-2011
25-03-2011
26-03-2011
27-03-2011

我真的希望你们能帮帮我，我只是在任何地方都找不到遮阳篷！

I really hope you guys can help me out, i just cant find the awnser anywhere!

提前致谢.

推荐答案

注意

我似乎错过了错误.当前代码已于 2012 年 1 月 30 日更新以说明这一事实，我们现在根据 Mikael Svenson 似乎解决了这个问题.

Note

I appear to have missed bug. The current code have been updated as of 2012-01-30 to account for this fact and we now derive the daysOffset based on Tuesday which according to Mikael Svenson appears to solve the problem.

这些 ISO8601 周日期计算有点不靠谱，但你是这样做的:

These ISO8601 week date calculations are a bit wonky, but this is how you do it:

DateTime jan1 = new DateTime(yyyy, 1, 1); 

int daysOffset = DayOfWeek.Tuesday - jan1.DayOfWeek; 

DateTime firstMonday = jan1.AddDays(daysOffset); 

var cal = CultureInfo.CurrentCulture.Calendar; 

int firstWeek = cal.GetWeekOfYear(jan1, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

var weekNum = ww;

if (firstWeek <= 1) 
{ 
    weekNum -= 1; 
}

var result = firstMonday.AddDays(weekNum * 7 + d - 1);

return result;

基本上计算一个参考点，然后加上天，困难的事情与第 53 周有时可能发生在 1 月而第 1 周有时可能发生在 12 月这一事实有关.您需要对此进行调整，这是一种方法.

Basically calculate a reference point, then add days, the hard stuff has to do with the fact that week 53 can sometimes occur in January and week 1 can sometimes occur in December. You need to adjust for that and this is one way to do that.

上面的代码计算了一年的日期(yyyy)和周数(ww)和星期几(d).

The above code calculates the date off a year (yyyy) and week number (ww) and day of week (d).

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