根据年月获取每周起止时间

 #region  根据年月获取每周起止时间
    public string RegexDay(string time)
    {
        Regex r = new Regex("-"); // Split on hyphens.
        string[] s = r.Split(time);
        return s[s.Length - 1].ToString();
    }
    public  string GetWeekRange(System.DateTime dt)
    {
        int weeknow = Convert.ToInt32(dt.DayOfWeek);
        int daydiff = (-1) * weeknow;
        int dayadd = 6 - weeknow;
        string dateBegin = dt.AddDays(daydiff).Date.ToString("yyyy-mm-dd");
        string dateEnd = dt.AddDays(dayadd).Date.ToString("yyyy-mm-dd");
        return dateBegin + " - " + dateEnd;
    }
    public void GetDay(int year, int month, ref string[] weekrangeStart, ref string[] weekrangeEnd)
    {
        
        //第一周
        string firstdayofmonth = year + "-" + month + "-1";
        weekrangeStart[0]=firstdayofmonth;
        firstdayofmonth = GetWeekRange(Convert.ToDateTime(firstdayofmonth));
        int firstweeklastday = Convert.ToInt32(RegexDay(firstdayofmonth));
        weekrangeEnd[0] = year + "-" + month + "-" + firstweeklastday;

        //第二周
        weekrangeStart[1] = (Convert.ToDateTime(weekrangeEnd[0])).AddDays(1).Date.ToString("yyyy-MM-dd");
        weekrangeEnd[1] = (Convert.ToDateTime(weekrangeStart[1])).AddDays(7 - 1).Date.ToString("yyyy-MM-dd");
        //第三周
        weekrangeStart[2] = (Convert.ToDateTime(weekrangeEnd[1])).AddDays(1).Date.ToString("yyyy-MM-dd");
        weekrangeEnd[2] = (Convert.ToDateTime(weekrangeStart[2])).AddDays(7 - 1).Date.ToString("yyyy-MM-dd");
        //第四周
        weekrangeStart[3] = (Convert.ToDateTime(weekrangeEnd[2])).AddDays(1).Date.ToString("yyyy-MM-dd");
        weekrangeEnd[3] = (Convert.ToDateTime(weekrangeStart[3])).AddDays(7 - 1).Date.ToString("yyyy-MM-dd");
        //第五周
        weekrangeStart[4] = (Convert.ToDateTime(weekrangeEnd[3])).AddDays(1).Date.ToString("yyyy-MM-dd");
        weekrangeEnd[4] = (Convert.ToDateTime(weekrangeStart[4])).AddDays(7 - 1).Date.ToString("yyyy-MM-dd");
       
    }
    #endregion

转载于:https://www.cnblogs.com/super-yc/archive/2007/03/08/668104.html