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  • DateHelper

    public static class DateHelp
        {
            /// <summary>
            /// 获取当前日期是该月的第几周
            /// </summary>
            /// <param name="dateNow"></param>
            /// <returns>该日期所在周是第几周</returns>
            public static int WeekOfMonth(DateTime dateNow)
            {
                DateTime StartDate = new DateTime(dateNow.Year, dateNow.Month, 1);
                DateTime EndDate = StartDate.AddMonths(1).AddDays(-1);
                int WeekIndex = 1;
                TimeSpan ts = dateNow - StartDate;
                DateTime TempDate = StartDate;
                if (TempDate.DayOfWeek == System.DayOfWeek.Monday)
                    TempDate = TempDate.AddDays(1);
                while (TempDate <= EndDate)
                {
                    if (TempDate.DayOfWeek == System.DayOfWeek.Monday && dateNow.ToString("yyyy-MM-dd") != StartDate.ToString("yyyy-MM-dd"))
                    {
                        WeekIndex++;
                    }
                    if (TempDate.ToString("yyyy-MM-dd") == dateNow.ToString("yyyy-MM-dd"))
                    {
                        break;
                    }
                    TempDate = TempDate.AddDays(1);
                }
    
                return WeekIndex;
    
            }
    
            /// <summary>
            /// 获取当前日期所在周的周一日期
            /// </summary>
            /// <param name="dateNow"></param>
            /// <returns></returns>
            public static DateTime? GetStartWeekDate(DateTime dateNow)
            {
                for (int i = 0; i < 7; i++)
                {
                    DateTime temp = dateNow.AddDays(i * (-1));
                    if (temp.DayOfWeek == System.DayOfWeek.Monday)
                        return temp;
                }
                return null;
            }
            /// <summary>
            /// 获取当前日期所在周的周日日期
            /// </summary>
            /// <param name="dateNow"></param>
            /// <returns></returns>
            public static DateTime? GetEndWeekDate(DateTime dateNow)
            {
                for (int i = 0; i < 7; i++)
                {
                    DateTime temp = dateNow.AddDays(i);
                    if (temp.DayOfWeek == System.DayOfWeek.Sunday)
                        return temp;
                }
                return null;
            }
        }
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  • 原文地址:https://www.cnblogs.com/MrZheng/p/8968106.html
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