RFID的winform程序心得1

 /// 根据日期获取当周星期一
         /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static DateTime StartOfTheWeek(DateTime dt)
        {
            return dt.AddDays(-(Convert.ToInt16(dt.DayOfWeek)-1));
        }
        /// <summary>
        /// 根据日期获取当周末
         /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static DateTime EndOfTheWeek(DateTime dt)
        {
            return StartOfTheWeek(dt).AddDays(6);
        }
        /// <summary>
        ///根据日期获取月初日期
         /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static DateTime StartOfTheMonth(DateTime dt)
        {
            return new DateTime(dt.Year, dt.Month, 1);
        }
        /// <summary>
        /// 根据日期获取月底日期
         /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static DateTime EndOfTheMonth(DateTime dt)
        {
            return StartOfTheMonth(dt).AddMonths(1).AddDays(-1);
        }
        /// <summary>
        /// 感觉日期年初日期
         /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static DateTime StartOfTheYear(DateTime dt)
        {
            return new DateTime(dt.Year, 1, 1);
        }

        /// <summary>
        /// 根据日期获取年底日期
         /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static DateTime EndOfTheYear(DateTime dt)
        {
            return StartOfTheYear(dt).AddYears(1).AddDays(-1);
        }

View Code