计算一个给定日期范围星期一的数 [英] Count number of Mondays in a given date range

问题描述

给定一个日期范围，我需要知道很多星期一（或星期二，星期三等），如何在这个范围内。

Given a date range, I need to know how many Mondays (or Tuesdays, Wednesdays, etc) are in that range.

我目前工作在C＃。

推荐答案

试试这个：

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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