对任何一天是星期几算法的实现

    /// <summary>
        ///获取当天是星期几
        /// </summary>
        /// <param name="year">年</param>
        /// <param name="month">月</param>
        /// <param name="day">日</param>
        /// <returns>string </returns>
        public static string GetWeek ( string year, string month, string day )
            {
            string str_date = year + "-" + month + "-" + day;
            return Convert.ToDateTime ( str_date ).ToString ( "ddd", new System.Globalization.CultureInfo ( "zh-cn" ) );

            }

更详细请点击:http://www.cnblogs.com/yice/archive/2005/09/02/228881.html