复制代码 代码如下:

DateTime dt = DateTime.Now;

//本月第一天时间

DateTime dt_First = dt.AddDays(-(dt.Day) + 1);

Label1.Text = dt_First.ToString("yyyy-MM-dd");

//将本月月数+1

DateTime dt2 = dt.AddMonths(1);

//本月最后一天时间

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;

//本周第一天

lblBegin.Text = System.DateTime.Now.AddDays(daydiff).ToString("yyyy-MM-dd");

//本周最后一天

lblEnd.Text = System.DateTime.Now.AddDays(dayadd).ToString("yyyy-MM-dd");