当我将参数传递为星期和年份时如何获取当前日期 [英] How to get the current date when i pass the parameter as week and year

问题描述

当我将参数传递为星期和年份时，如何获取当前日期.

例子，

我有25-2011(星期和年)，如何获取这个星期和年的日期...?

Hi,

How to get the current date when i pass the parameter as week and year.

Example,

I have 25-2011 (week and year), How to get the date for this week and year...?

推荐答案

检查此链接.

http://stackoverflow.com/questions/662379/calculate-date-from-week-number [^ ]

Check this link.

http://stackoverflow.com/questions/662379/calculate-date-from-week-number[^]

此处的逻辑:
1.找出一年中1月1日的星期几(星期日或星期一等).
2.根据步骤1的结果，确定一年中的第一个星期日.
3.如果1月1日本身是星期日，则成为第一周，否则就是第二周.
4.使用第3步中的结果，以一周中有7天这一事实来确定任何特定星期的天数.

Heres the logic:
1. Find out the Day of Week of Jan 1 of the year (Sunday or Monday etc......)
2. Based on results from step 1, determine the first Sunday of the year.
3. If Jan 1st itself is a Sunday, that becomes the first week, else it is the second week.
4. Use results from step 3 to determine the days for any specific week # using the fact that a week has 7 days.

尝试:

private static DateTime GetDateFromWeek(int year, int weekOfYear)
   {
   DateTime jan1 = new DateTime(year, 1, 1);
   int daysOffset = (int)CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek - (int)jan1.DayOfWeek;
   DateTime firstMonday = jan1.AddDays(daysOffset);
   int firstWeek = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(jan1, CultureInfo.CurrentCulture.DateTimeFormat.CalendarWeekRule, CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek);
   if (firstWeek <= 1)
      {
      weekOfYear -= 1;
      }
   return firstMonday.AddDays(weekOfYear * 7);
   }

不记得我从哪里得到的，但是你去了...

Can''t remember where I got it, but there you go...

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