获取每月的C＃周 [英] Get week of month C#

问题描述

我想使用c＃桌面应用程序查找日期是星期几。

I want to find a date are now on week number with c# desktop Application.

我一直在Google上搜索，但都不符合我的需求。

I've been looking on google, but none that fit my needs.

如何在一个月内得到一个星期，如下例所示？

How do I get a week in a month as the example below?

示例：

我想要2014年1月6日= 1月的第一周

I want January 6, 2014 = the first week of January

2014年1月30日=一月的第四周

January 30, 2014 = fourth week of January

但2014年2月1日= 1月的第4周

but 1 February 2014 = week 4 in January

，2014年2月3日是2月的第一周

and 3 February 2014 was the first week in February

推荐答案

这里是方法：

static int GetWeekNumberOfMonth(DateTime date)
{
    date = date.Date;
    DateTime firstMonthDay = new DateTime(date.Year, date.Month, 1);
    DateTime firstMonthMonday = firstMonthDay.AddDays((DayOfWeek.Monday + 7 - firstMonthDay.DayOfWeek) % 7);
    if (firstMonthMonday > date)
    {
        firstMonthDay = firstMonthDay.AddMonths(-1);
        firstMonthMonday = firstMonthDay.AddDays((DayOfWeek.Monday + 7 - firstMonthDay.DayOfWeek) % 7);
    }
    return (date - firstMonthMonday).Days / 7 + 1;
}

测试：

Console.WriteLine(GetWeekNumberOfMonth(new DateTime(2014, 1, 6)));  // 1
Console.WriteLine(GetWeekNumberOfMonth(new DateTime(2014, 1, 30))); // 4
Console.WriteLine(GetWeekNumberOfMonth(new DateTime(2014, 2, 1)));  // 4
Console.WriteLine(GetWeekNumberOfMonth(new DateTime(2014, 2, 3)));  // 1

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