在 .NET 中计算月份中的一周 [英] Calculate week of month in .NET

问题描述

.NET 库是否有返回给定日期的周数的简单方法?例如输入Year = 2010, Month = 1, Day = 25，应该输出5作为周数.

Do the .NET libraries have an easy way of returning the week number for a given date? For example, input of Year = 2010, Month = 1, Day = 25, should output 5 for the week number.

我发现最近的是 Calendar.GetWeekOfYear，几乎就在那里.

Closest I found was Calendar.GetWeekOfYear, which is almost there.

Java 有一个日期字符串格式W"，它按月返回一周，但我在 .NET 中看不到任何等效的东西.

Java has a date string format "W" which returns week in month but I can't see anything equivalent in .NET.

推荐答案

没有内置的方法可以做到这一点，但这里有一个扩展方法可以为您完成这项工作:

There is no built in way to do this but here is an extension method that should do the job for you:

static class DateTimeExtensions {
    static GregorianCalendar _gc = new GregorianCalendar();
    public static int GetWeekOfMonth(this DateTime time) {
        DateTime first = new DateTime(time.Year, time.Month, 1);
        return time.GetWeekOfYear() - first.GetWeekOfYear() + 1;
    }

    static int GetWeekOfYear(this DateTime time) {
        return _gc.GetWeekOfYear(time, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
    }
}

用法:

DateTime time = new DateTime(2010, 1, 25);
Console.WriteLine(time.GetWeekOfMonth());

输出:

5

您可以根据需要更改GetWeekOfYear.

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