如何计算两个日期之间的星期日没有 [英] How to calculate no of sundays between two dates

问题描述

大家好，



我想计算两个日期之间的星期日。



请让我知道如何计算它？



感谢你

Mohammad wasif

Hi All,

I want to calculate no of Sunday between two dates.

Please let me know how to calculate it?

Thanking you
Mohammad wasif

推荐答案

请参阅下面的代码，前提是sDate< fDate。

添加条件来操纵sDate（startDate）和fDate（finishDate）

See the code below, provided that sDate < fDate.
Add conditions to manipulate the sDate(startDate) and fDate(finishDate)

//DateTime fdate = DateTime.Now.AddDays(10);
DateTime fdate = yourFinishDate;
//DateTime sdate = DateTime.Now.AddDays(-1);
DateTime sdate = yourStartDate;
TimeSpan ts = fdate - sdate;
var sundays = ((ts.TotalDays / 7) + (sdate.DayOfWeek == DayOfWeek.Sunday || fdate.DayOfWeek == DayOfWeek.Sunday || fdate.DayOfWeek > sdate.DayOfWeek ? 1 : 0));

sundays = Math.Round(sundays - .5, MidpointRounding.AwayFromZero);

Btw，代码在c＃中。祝你好运！

Btw, code in c#. Good luck!

DateTime fdate = yourFinishDate;
DateTime sdate = yourStartDate;

int CountSundays = (1 + fdate.Subtract(sdate).Days + (6 + (int)sdate.DayOfWeek) % 7) / 7;

static int CountDays(DayOfWeek day, DateTime start, DateTime end)
   {
       TimeSpan ts = end - start;                       // Total duration
       int count = (int)Math.Floor(ts.TotalDays / 7);   // Number of whole weeks
       int remainder = (int)(ts.TotalDays % 7);         // Number of remaining days
       int sinceLastDay = (int)(end.DayOfWeek - day);   // Number of days since last [day]
       if (sinceLastDay < 0) sinceLastDay += 7;         // Adjust for negative days since last [day]

       // If the days in excess of an even week are greater than or equal to the number days since the last [day], then count this one, too.
       if (remainder >= sinceLastDay) count++;

       return count;
   }

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-KR

[source]

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