C# 中的日期时间格式

本文关键字：时间 格式 日期 | 更新日期: 2023-09-18 11:27:13

在 C# 中，可以使用 ToString() 方法将日期和字符串从DateTime对象获取为不同的格式。 在 ToString() 方法中将格式指定为字符串参数，以获取所需格式的日期字符串。

下面的示例演示如何获取不同格式的日期和时间字符串。

示例： DateTime Formats using ToString()

//4th August 2021, 23:58:30:999 (hours:minutes:seconds:milliseconds)
var mydate = new DateTime(2021,8,4,23,58,30,999); 
mydate.ToString("MM/dd/yy"); // 08/4/21
mydate.ToString("MM/dd/yyyy");//08/04/2021
mydate.ToString("dd/MM/yy");//04/08/21
mydate.ToString("dd-MM-yy");//04-08-21
mydate.ToString("ddd, dd MMM yyyy"); // Wed, 04 Aug 2021
mydate.ToString("dddd, dd MMMM yy"); // Wednesday, 04 August 21
mydate.ToString("dddd, dd MMMM yyyy HH:mm"); // Wednesday, 04 August 2021 23:58
mydate.ToString("MM/dd/yy HH:mm"); // 08/04/21 23:58
mydate.ToString("MM/dd/yyyy hh:mm tt"); // 08/04/2021 11:58 PM
mydate.ToString("MM/dd/yyyy H:mm t"); // Wed, 04 Aug 2021 P
mydate.ToString("MM/dd/yyyy H:mm:ss"); // 08/04/2021 23:58:30
mydate.ToString("MMM dd"); // Aug 04
mydate.ToString("MM-dd-yyyTHH:mm:ss.fff"); // 08-04-2021T23:58:30.999
mydate.ToString("MM-dd-yyy g"); // 08-04-2021 A.D.
mydate.ToString("HH:mm"); // 23:58
mydate.ToString("hh:mm tt"); // 11:58 PM
mydate.ToString("HH:mm:ss"); // 23:58:30
mydate.ToString("'Full DateTime:' MM-dd-yyyTHH:mm:ss"); // Full DateTime: 08-04-2021T23:58:30

自定义日期格式说明符(Custom Date Format Specifiers)

可以在 ToString() 方法中使用一个或多个以下格式说明符的组合来根据需要获取日期字符串。

下面的示例演示了上表的所有格式说明符。

示例： DateTime Formats in C#

var mydate = new DateTime(2021, 8, 4, 23, 58, 30, 999);
//day formats
Console.WriteLine(""d" -> {0}", mydate.ToString("d"));
Console.WriteLine(""d/M/yy" -> {0}", mydate.ToString("d/M/yy"));
Console.WriteLine(""dd" -> {0}", mydate.ToString("dd"));
Console.WriteLine(""ddd" -> {0}", mydate.ToString("ddd"));
Console.WriteLine(""dddd" -> {0}", mydate.ToString("dddd"));
//month formats
Console.WriteLine(""M" -> {0}", mydate.ToString("M"));
Console.WriteLine(""d/M/yy" -> {0}", mydate.ToString("d/M/yy"));
Console.WriteLine(""MM" -> {0}", mydate.ToString("MM"));
Console.WriteLine(""MMm" -> {0}", mydate.ToString("MMM"));
Console.WriteLine(""MMMM" -> {0}", mydate.ToString("MMMM"));
//year formats
Console.WriteLine(""y" -> {0}", mydate.ToString("y"));
Console.WriteLine(""yy" -> {0}", mydate.ToString("yy"));
Console.WriteLine(""yyy" -> {0}", mydate.ToString("yyy"));
Console.WriteLine(""yyyy" -> {0}", mydate.ToString("yyyy"));
Console.WriteLine(""yyyyy" -> {0}", mydate.ToString("yyyyy"));
//hour formats
Console.WriteLine(""mm/dd/yy h" -> {0}", mydate.ToString("MM/dd/yy h"));
Console.WriteLine(""hh" -> {0}", mydate.ToString("hh"));
Console.WriteLine(""mm/dd/yy h" -> {0}", mydate.ToString("MM/dd/yy H"));
Console.WriteLine(""HH" -> {0}", mydate.ToString("HH"));
//minuts formats
Console.WriteLine(""m" -> {0}", mydate.ToString("m"));
Console.WriteLine(""mm" -> {0}", mydate.ToString("mm"));
Console.WriteLine(""h:m" -> {0}", mydate.ToString("h:m"));
Console.WriteLine(""hh:mm" -> {0}", mydate.ToString("hh:mm"));
//second formats
Console.WriteLine(""s" -> {0}", mydate.ToString("s"));
Console.WriteLine(""ss" -> {0}", mydate.ToString("ss"));
//AM/PM
Console.WriteLine(""hh:mm t" -> {0}", mydate.ToString("hh:mm t"));
Console.WriteLine(""hh:mm tt" -> {0}", mydate.ToString("hh:mm tt"));
//timezone formats
Console.WriteLine(""mm/dd/yy K" -> {0}", mydate.ToString("MM/dd/yy K"));
Console.WriteLine(""mm/dd/yy z" -> {0}", mydate.ToString("MM/dd/yy z"));
Console.WriteLine(""zz" -> {0}", mydate.ToString("zz"));
Console.WriteLine(""zzz" -> {0}", mydate.ToString("zzz"));

了解有关自定义日期格式的详细信息here。

本文内容总结：

• 自定义日期格式说明符(Custom Date Format Specifiers)