C# DateTime的格式化日期

C# DateTime的格式化日期

DateTime dt = new DateTime(2019, 9, 6, 13, 4, 5, 100);                              //中文系统
Console.WriteLine(string.Format("{0:y yy yyy yyyy}", dt));                          //19 19 2019 2019
Console.WriteLine(string.Format("{0:M MM MMM MMMM}", dt));                          //9 09 9月 九月
Console.WriteLine(string.Format("{0:d dd ddd dddd}", dt));                          //6 06 周五 星期五
Console.WriteLine(string.Format("{0:t tt}", dt));                                   //下 下午
Console.WriteLine(string.Format("{0:H HH}", dt));                                   //13 13
Console.WriteLine(string.Format("{0:h hh}", dt));                                   //1 01
Console.WriteLine(string.Format("{0:m mm}", dt));                                   //4 04
Console.WriteLine(string.Format("{0:s ss}", dt));                                   //5 05
Console.WriteLine(string.Format("{0:F FF FFF FFFF FFFFF FFFFFF FFFFFFF}", dt));     //1 1 1 1 1 1 1
Console.WriteLine(string.Format("{0:f ff fff ffff fffff ffffff fffffff}", dt));     //1 10 100 1000 10000 100000 1000000
Console.WriteLine(string.Format("{0:z zz zzz}", dt));                               //+8 +08 +08:00
Console.WriteLine(string.Format("{0:yyyy/MM/dd HH:mm:ss.fff}", dt));                //2019/09/06 13:04:05.100
Console.WriteLine(string.Format("{0:yyyy/MM/dd dddd}", dt));                        //2019/09/06 星期五
Console.WriteLine(string.Format("{0:yyyy/MM/dd dddd tt hh:mm}", dt));               //2019/09/06 星期五 下午 01:04
Console.WriteLine(string.Format("{0:yyyyMMdd}", dt));                               //20190906
Console.WriteLine(string.Format("{0:yyyy-MM-dd HH:mm:ss.fff}", dt));                //2019-09-06 13:04:05.100

Console.WriteLine();

DateTime dt2 = new DateTime(2019, 9, 6, 13, 4, 5, 100);										//换成英文
System.Globalization.DateTimeFormatInfo dtInfo = new System.Globalization.CultureInfo("en-US", false).DateTimeFormat;
Console.WriteLine(string.Format(dtInfo, "{0:y yy yyy yyyy}", dt2));                         //19 19 2019 2019
Console.WriteLine(string.Format(dtInfo, "{0:M MM MMM MMMM}", dt2));                         //9 09 Sep September
Console.WriteLine(string.Format(dtInfo, "{0:d dd ddd dddd}", dt2));                         //6 06 Fri Friday
Console.WriteLine(string.Format(dtInfo, "{0:t tt}", dt2));                                  //P PM
Console.WriteLine(string.Format(dtInfo, "{0:H HH}", dt2));                                  //13 13
Console.WriteLine(string.Format(dtInfo, "{0:h hh}", dt2));                                  //1 01
Console.WriteLine(string.Format(dtInfo, "{0:m mm}", dt2));                                  //4 04
Console.WriteLine(string.Format(dtInfo, "{0:s ss}", dt2));                                  //5 05
Console.WriteLine(string.Format(dtInfo, "{0:F FF FFF FFFF FFFFF FFFFFF FFFFFFF}", dt2));    //1 1 1 1 1 1 1
Console.WriteLine(string.Format(dtInfo, "{0:f ff fff ffff fffff ffffff fffffff}", dt2));    //1 10 100 1000 10000 100000 1000000
Console.WriteLine(string.Format(dtInfo, "{0:z zz zzz}", dt2));                              //+8 +08 +08:00
Console.WriteLine(string.Format(dtInfo, "{0:yyyy/MM/dd HH:mm:ss.fff}", dt2));               //2019/09/06 13:04:05.100
Console.WriteLine(string.Format(dtInfo, "{0:yyyy/MM/dd dddd}", dt2));                       //2019/09/06 Friday
Console.WriteLine(string.Format(dtInfo, "{0:yyyy/MM/dd dddd tt hh:mm}", dt2));              //2019/09/06 Friday PM 01:04
Console.WriteLine(string.Format(dtInfo, "{0:yyyyMMdd}", dt2));                              //20190906
Console.WriteLine(string.Format(dtInfo, "{0:yyyy-MM-dd HH:mm:ss.fff}", dt2));               //2019-09-06 13:04:05.100 

Console.ReadKey();

除去string.Format()可以对日期进行格式化之外，*.ToString()也可以实现相同的效果：

DateTime dt = new DateTime(2019, 9, 6, 13, 4, 5, 100);                    //中文系统
Console.WriteLine(dt.ToString("y yy yyy yyyy"));                          //19 19 2019 2019
Console.WriteLine(dt.ToString("M MM MMM MMMM"));                          //9 09 9月 九月
Console.WriteLine(dt.ToString("d dd ddd dddd"));                          //6 06 周五 星期五
Console.WriteLine(dt.ToString("t tt"));                                   //下 下午
Console.WriteLine(dt.ToString("H HH"));                                   //13 13
Console.WriteLine(dt.ToString("h hh"));                                   //1 01
Console.WriteLine(dt.ToString("m mm"));                                   //4 04
Console.WriteLine(dt.ToString("s ss"));                                   //5 05
Console.WriteLine(dt.ToString("F FF FFF FFFF FFFFF FFFFFF FFFFFFF"));     //1 1 1 1 1 1 1
Console.WriteLine(dt.ToString("f ff fff ffff fffff ffffff fffffff"));     //1 10 100 1000 10000 100000 1000000
Console.WriteLine(dt.ToString("z zz zzz"));                               //+8 +08 +08:00
Console.WriteLine(dt.ToString("yyyy/MM/dd HH:mm:ss.fff"));                //2019/09/06 13:04:05.100
Console.WriteLine(dt.ToString("yyyy/MM/dd dddd"));                        //2019/09/06 星期五
Console.WriteLine(dt.ToString("yyyy/MM/dd dddd tt hh:mm"));               //2019/09/06 星期五 下午 01:04
Console.WriteLine(dt.ToString("yyyyMMdd"));                               //20190906
Console.WriteLine(dt.ToString("yyyy-MM-dd HH:mm:ss.fff"));                //2019-09-06 13:04:05.100