C#常用获取本周、本月、本季度、本年的时间起止段代码

        /// <summary>
        /// 今日
        /// </summary>
        /// <param name="start"></param>
        /// <param name="end"></param>
        public static void GetRangeToday(out DateTime start, out DateTime end)
        {
            start = DateTime.Now.Date;
            end = start; 
        }

        /// <summary>
        /// 本周
        /// </summary>
        /// <param name="start"></param>
        /// <param name="end"></param>
        public static void GetRangeThisWeek(out DateTime start, out DateTime end)
        {
            DateTime dt = DateTime.Now.Date;
            start = dt.AddDays(-(int)dt.DayOfWeek); 
            end = start.AddDays(6); 
        }

        /// <summary>
        /// 本月
        /// </summary>
        /// <param name="start"></param>
        /// <param name="end"></param>
        public static void GetRangeThisMonth(out DateTime start, out DateTime end)
        {
            DateTime dt = DateTime.Now;
            start = new DateTime(dt.Year, dt.Month, 1);
            end = start.AddMonths(1).AddDays(-1); 
        }

        /// <summary>
        /// 本季度
        /// </summary>
        /// <param name="start"></param>
        /// <param name="end"></param>
        public static void GetRangeThisSeason(out DateTime start, out DateTime end)
        {
            DateTime dt = DateTime.Now;
            int month = (dt.Month - 1)/3 * 3 + 1;
            start = new DateTime(dt.Year, month, 1);
            end = start.AddMonths(3).AddDays(-1); 

        }

        /// <summary>
        /// 本季度
        /// </summary>
        /// <param name="start"></param>
        /// <param name="end"></param>
        public static void GetRangeThisYear(out DateTime start, out DateTime end)
        {
            DateTime dt = DateTime.Now;
            start = new DateTime(dt.Year, 1, 1);
            end = start.AddYears(1).AddDays(-1);
        }