Question

我想编写一个函数，该函数在一年内获得一个周数，并返回该周的开始日期。另一个获取周数的函数，并返回该周的结束日期。

伪代码：

public DateTime GetSaturdayDateOfWeek(int weekNumberInYear)
{
    // calculations, that finds the Saturday of that week, 00:00:00 of midnight
    return DateTime.Now;
}

public DateTime GetFriddayDateOfWeek(int weekNumberInYear)
{
    // calculations, that finds the Friday of that week, 23:59:59
    return DateTime.Now;
}

如何计算这些日期？

This question is in PHP并没有帮助我。 this question gets the week number of the month也是this。我有一年中的周数。

Answer 1

它并不漂亮，Zohar Peled的评论是非常有效的，但这适用于正常的＆＃34; （因为缺少一个更好的词）日历。（IE：没有本地化，没什么特别的）这应该提供足够的基础来实现。

public DateTime GetSaturdayDateOfWeek(int weekNumberInYear)
{
    var myDate = new DateTime(DateTime.Now.Year, 1, 1);
    myDate = myDate.AddDays((weekNumberInYear -1)* 7);
    if (myDate.DayOfWeek < DayOfWeek.Saturday)
    {
        myDate = myDate.AddDays(DayOfWeek.Saturday - myDate.DayOfWeek);
    }
    if (myDate.DayOfWeek > DayOfWeek.Saturday)
    {
        myDate = myDate.AddDays(myDate.DayOfWeek - DayOfWeek.Saturday);
    }
    return myDate;
}

给定C＃中的一周数，我如何获得该周的开始和结束日期？

1 个答案: