C#中时间的格式化

C#中各种时间格式化方法的效果如下：（可以和sql sever中作以下比较，sql sever中提供的方法也比较多）

DateTime dt = DateTime.Now;
Label1.Text = dt.ToString();                                           //2005-11-5 13:21:25
Label2.Text = dt.ToFileTime().ToString();                      //127756416859912816
Label3.Text = dt.ToFileTimeUtc().ToString();                 //127756704859912816
Label4.Text = dt.ToLocalTime().ToString();                   //2005-11-5 21:21:25
Label5.Text = dt.ToLongDateString().ToString();            //2005年11月5日
Label6.Text = dt.ToLongTimeString().ToString();            //13:21:25
Label7.Text = dt.ToOADate().ToString();                       //38661.5565508218
Label8.Text = dt.ToShortDateString().ToString();            //2005-11-5
Label9.Text = dt.ToShortTimeString().ToString();            //13:21
Label10.Text = dt.ToUniversalTime().ToString();             //2005-11-5 5:21:25

Label1.Text = dt.Year.ToString();                                         //2005
Label2.Text = dt.Date.ToString();                                         //2005-11-5 0:00:00
Label3.Text = dt.DayOfWeek.ToString();                             //Saturday
Label4.Text = dt.DayOfYear.ToString();                               //309
Label5.Text = dt.Hour.ToString();                                         //13
Label6.Text = dt.Millisecond.ToString();                               //441
Label7.Text = dt.Minute.ToString();                                      //30
Label8.Text = dt.Month.ToString();                                       //11
Label9.Text = dt.Second.ToString();                                      //28
Label10.Text = dt.Ticks.ToString();                                       //632667942284412864
Label11.Text = dt.TimeOfDay.ToString();                              //13:30:28.4412864
Label1.Text = dt.ToString();                                                   //2005-11-5 13:47:04
Label2.Text = dt.AddYears(1).ToString();                              //2006-11-5 13:47:04
Label3.Text = dt.AddDays(1.1).ToString();                            //2005-11-6 16:11:04
Label4.Text = dt.AddHours(1.1).ToString();                           //2005-11-5 14:53:04
Label5.Text = dt.AddMilliseconds(1.1).ToString();                  //2005-11-5 13:47:04
Label6.Text = dt.AddMonths(1).ToString();                            //2005-12-5 13:47:04
Label7.Text = dt.AddSeconds(1.1).ToString();                        //2005-11-5 13:47:05
Label8.Text = dt.AddMinutes(1.1).ToString();                         //2005-11-5 13:48:10
Label9.Text = dt.AddTicks(1000).ToString();                          //2005-11-5 13:47:04
Label10.Text = dt.CompareTo(dt).ToString();                          //0
//Label11.Text = dt.Add(?).ToString();                                     //问号为一个时间段
Label1.Text = dt.Equals("2005-11-6 16:11:04").ToString();      //False
Label2.Text = dt.Equals(dt).ToString();                                     //True
Label3.Text = dt.GetHashCode().ToString();                            //1474088234
Label4.Text = dt.GetType().ToString();                                     //System.DateTime
Label5.Text = dt.GetTypeCode().ToString();                             //DateTime

Label1.Text = dt.GetDateTimeFormats('s')[0].ToString();          //2005-11-05T14:06:25
Label2.Text = dt.GetDateTimeFormats('t')[0].ToString();           //14:06
Label3.Text = dt.GetDateTimeFormats('y')[0].ToString();           //2005年11月
Label4.Text = dt.GetDateTimeFormats('D')[0].ToString();          //2005年11月5日
Label5.Text = dt.GetDateTimeFormats('D')[1].ToString();          //2005 11 05
Label6.Text = dt.GetDateTimeFormats('D')[2].ToString();          //星期六 2005 11 05
Label7.Text = dt.GetDateTimeFormats('D')[3].ToString();          //星期六 2005年11月5日
Label8.Text = dt.GetDateTimeFormats('M')[0].ToString();         //11月5日
Label9.Text = dt.GetDateTimeFormats('f')[0].ToString();           //2005年11月5日 14:06
Label10.Text = dt.GetDateTimeFormats('g')[0].ToString();        //2005-11-5 14:06
Label11.Text = dt.GetDateTimeFormats('r')[0].ToString();         //Sat, 05 Nov 2005 14:06:25 GMT

Label1.Text =? string.Format("{0:d}",dt);                                   //2005-11-5
Label2.Text =? string.Format("{0:D}",dt);                                  //2005年11月5日
Label3.Text =? string.Format("{0:f}",dt);                                    //2005年11月5日 14:23
Label4.Text =? string.Format("{0:F}",dt);                                  //2005年11月5日 14:23:23
Label5.Text =? string.Format("{0:g}",dt);                                   //2005-11-5 14:23
Label6.Text =? string.Format("{0:G}",dt);                                  //2005-11-5 14:23:23
Label7.Text =? string.Format("{0:M}",dt);                                 //11月5日
Label8.Text =? string.Format("{0:R}",dt);                                  //Sat, 05 Nov 2005 14:23:23 GMT
Label9.Text =? string.Format("{0:s}",dt);                                   //2005-11-05T14:23:23
Label10.Text = string.Format("{0:t}",dt);                                   //14:23
Label11.Text = string.Format("{0:T}",dt);                                  //14:23:23
Label12.Text = string.Format("{0:u}",dt);                                   //2005-11-05 14:23:23Z
Label13.Text = string.Format("{0:U}",dt);                                  //2005年11月5日 6:23:23
Label14.Text = string.Format("{0:Y}",dt);                                  //2005年11月
Label15.Text = string.Format("{0}",dt);                                      //2005-11-5 14:23:23?
Label16.Text = string.Format("{0:yyyyMMddHHmmssffff}",dt);  //yyyymm等可以设置,比如Label16.Text = string.Format("{0:yyyyMMdd}",dt);