日期周期计算

方法一：

protected void Page_Load(object sender, EventArgs e)
    {

        string[] Day = new string[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };

        string[] data = { "2015-03-15", "2015-03-16", "2015-03-17", "2015-03-18", "2015-03-19", "2015-03-20", "2015-03-21" };

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < data.Length; i++)
        {
            int y = Convert.ToInt32(Convert.ToDateTime(data[i]).DayOfWeek.ToString("d"));
            Response.Write(y);
            Response.Write("</br>");

            //string week = Day[y].ToString();
            DateTime start = (Convert.ToDateTime(data[i])).AddDays(1 - y);
            DateTime end = (Convert.ToDateTime(data[i])).AddDays(6 - y);
            sb.Append("</br>");
            sb.Append(":" + data[i] + "  本周开始：" + start + "   本周结束" + end + "  \n");
            sb.Append("</br>");
        }

        Response.Write(sb.ToString());
}

方法二：

protected void Page_Load(object sender, EventArgs e)
{

　　StringBuilder sb = new StringBuilder();
        string[] data = getNowTime((DateTime.Now.DayOfWeek.ToString("d"))).Split(‘,‘);
        int num = Shove._Convert.StrToInt(DateTime.Now.DayOfWeek.ToString("d"), 0);
        List<string> wheres = new List<string>();
        for (int i = 0; i < Shove._Convert.StrToInt(data[0].ToString(), 0); i++)//前面
        {
            wheres.Add(DateTime.Now.AddDays(i - num).ToString("yyyy-MM-dd"));
        }
        //今天
        wheres.Add(DateTime.Now.ToString("yyyy-MM-dd"));
        //今天以后的
        for (int i = 0; i < Shove._Convert.StrToInt(data[1].ToString(), 0); i++)
        {
            wheres.Add(DateTime.Now.AddDays(i + 1).ToString("yyyy-MM-dd"));
        }


        for (int i = 0; i < wheres.Count; i++)
        {
            //wheres[i].ToString() + " 59:59:59";
        } 

}

 public string getNowTime(string str)
    {
        string strTemp = "";
        switch (str)
        {
            case "0":
                strTemp = "0,6";
                   break;
            case "1":
                   strTemp = "1,5";
                   break;
            case "2":
                   strTemp = "2,4";
                   break;
            case "3":
                   strTemp = "3,3";
                   break;
            case "4":
                   strTemp = "4,2";
                   break;
            case "5":
                   strTemp = "5,1";
                   break;
            case "6":
                   strTemp = "6,0";
                   break;
             default:
                   strTemp = "0,6";
                   break;

        }
         return strTemp;
    }

日期周期计算

原文：http://www.cnblogs.com/lizihong/p/4346195.html