a best way to do is as follows
DateTime dt = Convert.ToDateTime(lblDate.Text);
lblYear.Text = dt.Year;
lblMonth.Text = dt.Month;
lblDate.Text = dt.Date;
or you can do by finding in string too, but its not a good idea.. still I am showing it here..
lblYear.Text = lblDateTime.Text.Substring(0,4);
lblMonth.Text = lblDateTime.Text.Substring(5,2);
lblDate.Text = lblDateTime.Text.Substring(8,2);
mark as answer if solves your problem, it motivates :)