c# 擷取 本周、本月、本季度、本年 的開始時間或結束時間

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        #region 擷取 本周、本月、本季度、本年 的開始時間或結束時間        /// <summary>        /// 擷取結束時間        /// </summary>        /// <param name="TimeType">Week、Month、Season、Year</param>        /// <param name="now"></param>        /// <returns></returns>        public static DateTime? GetTimeStartByType(string TimeType, DateTime now)        {            switch (TimeType)            {                case "Week":                    return now.AddDays(-(int)now.DayOfWeek + 1);                case "Month":                    return now.AddDays(-now.Day + 1);                case "Season":                    var time = now.AddMonths(0 - ((now.Month - 1) % 3));                    return time.AddDays(-time.Day + 1);                case "Year":                    return now.AddDays(-now.DayOfYear + 1);                default:                    return null;            }        }        /// <summary>        /// 擷取結束時間        /// </summary>        /// <param name="TimeType">Week、Month、Season、Year</param>        /// <param name="now"></param>        /// <returns></returns>        public static DateTime? GetTimeEndByType(string TimeType, DateTime now)        {            switch (TimeType)            {                case "Week":                    return now.AddDays(7 - (int)now.DayOfWeek);                case "Month":                    return now.AddMonths(1).AddDays(-now.AddMonths(1).Day + 1).AddDays(-1);                case "Season":                    var time = now.AddMonths((3 - ((now.Month - 1) % 3) - 1));                    return time.AddMonths(1).AddDays(-time.AddMonths(1).Day + 1).AddDays(-1);                case "Year":                    var time2 = now.AddYears(1);                    return time2.AddDays(-time2.DayOfYear);                default :                    return null;            }        }        #endregion

 

c# 擷取 本周、本月、本季度、本年 的開始時間或結束時間