System.DateTime dt = System.DateTime.Now;
System.DateTime ThisMonBeginDay = new System.DateTime(dt.Year, dt.Month, 1);
System.DateTime UltMonEndDay = ThisMonBeginDay.AddDays(-1);
System.DateTime ThisMonEndDay = ThisMonBeginDay.AddMonths(1).AddDays(-1);
利用System.DateTime Contructor找出本月月初的日期。上月月底 = 本月月初 - 1天;本月月底 = 本月月初 + 1個月 - 1天。如此利用簡單的概念即可算出日期。
另外System.Globalization命名空間中提供了2個類別:TaiwanCalendar、TaiwanLunisolarCalendar。
System.DateTime dt = System.DateTime.Now;
TaiwanCalendar tc = new TaiwanCalendar();
int Year = tc.GetYear(dt);
// 97
int Mon = tc.GetMonth(dt);
// 6
int day = tc.GetDayOfMonth(dt);
// 9
TaiwanLunisolarCalendar tlc = new TaiwanLunisolarCalendar();
int LuniYear = tlc.GetYear(dt);
// 97
int LuniMon = tlc.GetMonth(dt);
// 5
int Luniday = tlc.GetDayOfMonth(dt);
// 6
綜合上述可以得到以下這張圖
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