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DateTime today = DateTime.Today;     //  获取 当前日期： {2024-08-06 00:00:00}

DateTime newDate = today.AddDays(10);    //  当前日期 + 10天：{2024-08-16 00:00:00}

TimeSpan difference = newDate - today;    //  计算 两个日期 之间的 日期差：{10.00:00:00}

int aDay = difference.Days;   // 10

int weekOfYear = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(newDate, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);     //  获取 日期 是 多少周：33

int daysInMonth = DateTime.DaysInMonth(newDate.Year, newDate.Month);     //  获取 一个月中的 天数：31

DateTime dt = DateTime.Now;   // {2024-08-06 09:15:26}
string MM1 = dt.AddMonths(-1).ToString("MMM", new System.Globalization.CultureInfo("en-us"));   // 月英文缩写："Jul"
string MM2 = dt.AddMonths(1).ToString("MMM", new System.Globalization.CultureInfo("en-us"));   // 月英文缩写："Sep"

DateTime ThisMonth_Frist = DateTime.Now.AddDays(1 - DateTime.Now.Day).Date;   // 当月第一天：{2024-08-01 00:00:00}
DateTime ThisMOnth_Last = DateTime.Now.AddDays(1 - DateTime.Now.Day).Date.AddMonths(1).AddSeconds(-1);   // 当月最后一天：{2024-08-31 23:59:59}

DateTime Today = DateTime.Today;   // 当天时间：{2024-08-06 00:00:00}

DateTime ThisMonth = new DateTime(Today.Year, Today.Month, 1);   // 当前月第一天时间：{2024-08-01 00:00:00}

DateTime LastMonth_First = ThisMonth.AddMonths(-1);   // 上月第一天时间：{2024-07-01 00:00:00}
DateTime LastMonth_Last = ThisMonth.AddDays(-1);   // 上月最后一天时间：{2024-07-31 00:00:00}

int daysInWeek1 = (int)DateTime.Now.DayOfWeek;   // 注意：此处周日时返回0：2 周二
int daysInWeek2 = (int)DateTime.Now.DayOfWeek == 0 ? 7 : (int)DateTime.Now.DayOfWeek;   // 当前周第几天,注释:周日为0：2 周二

bool isWeekend = newDate.DayOfWeek == DayOfWeek.Saturday || newDate.DayOfWeek == DayOfWeek.Sunday;     //  获取 日期 是否 是周末：false

for (DateTime date = today; date <= newDate; date = date.AddDays(1))   // 获取 两个日期之间 的所有日期
{
    Debug.Print(date.ToString("dd-MM-yyyy"));  // Console.WriteLine(date.ToString("dd-MM-yyyy"));
}
/*
    06-08-2024
    07-08-2024
    08-08-2024
    09-08-2024
    10-08-2024
    11-08-2024
    12-08-2024
    13-08-2024
    14-08-2024
    15-08-2024
    16-08-2024
*/