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 DateTime dt = DateTime.Now;
 //±¾ÔµÚÒ»Ììʱ¼ä   
DateTime dt_First = dt.AddDays(-(dt.Day) + 1);
 Label1.Text = dt_First.ToString("yyyy-MM-dd");
//½«±¾ÔÂÔÂÊý+1 
DateTime dt2 = dt.AddMonths(1);
//±¾ÔÂ×îºóÒ»Ììʱ¼ä  
DateTime dt_Last = dt2.AddDays(-(dt.Day));
Label2.Text = dt_Last.ToString("yyyy-MM-dd");
int weeknow = Convert.ToInt32(System.DateTime.Now.DayOfWeek);
int daydiff = (-1) * weeknow + 1;
int dayadd = 7 - weeknow;
//±¾ÖܵÚÒ»Ìì
string datebegin = System.DateTime.Now.AddDays(daydiff).ToString("yyyy-MM-dd");
//±¾ÖÜ×îºóÒ»Ìì
string dateend = System.DateTime.Now.AddDays(dayadd).ToString("yyyy-MM-dd");
Label3.Text = datebegin;
Label4.Text = dateend;


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