一个月的最后一个星期一 [英] last monday of month

问题描述

请问如何获取每月的最后一个星期一?
感谢

Hi,
How do I get the last monday of the month please?
Thanks

推荐答案

在这里看看:

Have a look here: DateTime extensions to make some simple tasks a little more readable[^] - it includes last-x-of month.

尝试一下:

Try this:

public static DateTime LastMonday(int year, int month)
{
    DateTime dt;
    if (month < 12)
        dt = new DateTime(year, month + 1, 1);
    else
        dt = new DateTime(year + 1, 1, 1);
    dt = dt.AddDays(-1);
    while (dt.DayOfWeek != DayOfWeek.Monday) dt = dt.AddDays(-1);
    return dt;
}

以下代码可用于获取LastDayOfMonth

The following code can be used to get the LastDayOfMonth

void Main()
{
    DateTime date = LastDayOfMonth(2012, 6, DayOfWeek.Monday);
    
    //date = 6/25/2012
}
    
public DateTime LastDayOfMonth(int year, int month, DayOfWeek dayOfWeek){
    DateTime lastDateOfMonth = new DateTime(year, month,
                                 DateTime.DaysInMonth(year,month));
    return lastDateOfMonth.AddDays(lastDateOfMonth.DayOfWeek < dayOfWeek ? 
    			dayOfWeek - lastDateOfMonth.DayOfWeek -  7 : 
    			dayOfWeek - lastDateOfMonth.DayOfWeek);
}

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