.net格式化时间

//2007年4月24日
     this.TextBox6.Text = System.DateTime.Now.ToString("D");
     //2007-4-24
     this.TextBox7.Text = System.DateTime.Now.ToString("d");

     //2007年4月24日 16:30:15
     this.TextBox8.Text = System.DateTime.Now.ToString("F");
     //2007年4月24日 16:30
     this.TextBox9.Text = System.DateTime.Now.ToString("f");

     //2007-4-24 16:30:15
     this.TextBox10.Text = System.DateTime.Now.ToString("G");
     //2007-4-24 16:30
     this.TextBox11.Text = System.DateTime.Now.ToString("g");

     //16:30:15
     this.TextBox12.Text = System.DateTime.Now.ToString("T");
     //16:30
     this.TextBox13.Text = System.DateTime.Now.ToString("t");

     //2007年4月24日 8:30:15
     this.TextBox14.Text = System.DateTime.Now.ToString("U");
     //2007-04-24 16:30:15Z
     this.TextBox15.Text = System.DateTime.Now.ToString("u");

     //4月24日
     this.TextBox16.Text = System.DateTime.Now.ToString("m");
     this.TextBox16.Text = System.DateTime.Now.ToString("M");
     //Tue, 24 Apr 2007 16:30:15 GMT
     this.TextBox17.Text = System.DateTime.Now.ToString("r");
     this.TextBox17.Text = System.DateTime.Now.ToString("R");
     //2007年4月
     this.TextBox19.Text = System.DateTime.Now.ToString("y");
     this.TextBox19.Text = System.DateTime.Now.ToString("Y");
     //2007-04-24T15:52:19.1562500+08:00
     this.TextBox20.Text = System.DateTime.Now.ToString("o");
     this.TextBox20.Text = System.DateTime.Now.ToString("O");
     //2007-04-24T16:30:15
     this.TextBox18.Text = System.DateTime.Now.ToString("s");
     //2007-04-24 15:52:19
     this.TextBox21.Text = System.DateTime.Now.ToString("yyyy-MM-dd HH：mm：ss：ffff");
     //2007年04月24 15时56分48秒
     this.TextBox22.Text = System.DateTime.Now.ToString("yyyy年MM月dd HH时mm分ss秒");

     //星期二, 四月 24 2007
     this.TextBox1.Text = System.DateTime.Now.ToString("dddd, MMMM dd yyyy");
     //二, 四月 24 '07
     this.TextBox2.Text = System.DateTime.Now.ToString("ddd, MMM d "'"yy");
     //星期二, 四月 24
     this.TextBox3.Text = System.DateTime.Now.ToString("dddd, MMMM dd");
     //4-07
     this.TextBox4.Text = System.DateTime.Now.ToString("M/yy");
     //24-04-07
     this.TextBox5.Text = System.DateTime.Now.ToString("dd-MM-yy");

DateTime.Now的后面有若干个ToString(),ToShortTimeString()之类的东东，到底都是干啥用的，还是做个程序测试一下吧

            string str = "";
            
            str += "ToShortDateString:" + DateTime.Now.ToShortDateString() + "<br>";
            str += "ToShortTimeString:" + DateTime.Now.ToShortTimeString() + "<br>";
            str += "ToLongDateString" + DateTime.Now.ToLongDateString() + "<br>";
            str += "ToLongTimeString" + DateTime.Now.ToLongTimeString() + "<br>";
            str += "ToString:" + DateTime.Now.ToString() + "<br>";

            Response.Write( str );