.net 框架基础(二) 日期和时间

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日期和时间

System空间下有三个不可变的结构体进行事件表示:DateTime、DateTimeOffset、TimeSpan

1. TimeSpan

创建TimeSpan方法：

• 通过构造器
• 通过调用其中一个静态 From … 方法
• 通过两个 DateTime相减得到

Console.WriteLine(new TimeSpan(2,30,0));        //02:30:00
Console.WriteLine(TimeSpan.FromHours(2.5));     //02:30:00
Console.WriteLine(TimeSpan.FromHours(-2.5));    //-02:30:00

TimeSpan TheDays = TimeSpan.FromDays(10) - TimeSpan.FromSeconds(1);
Console.WriteLine(TheDays.Days);            //9
Console.WriteLine(TheDays.Hours);           //23
Console.WriteLine(TheDays.Minutes);         //23
Console.WriteLine(TheDays.Seconds);         //59
Console.WriteLine(TheDays.Milliseconds);    //0

Console.WriteLine(TheDays.TotalDays);       //9.999988425925926
Console.WriteLine(TheDays.TotalHours);      //239.99972222222223
Console.WriteLine(TheDays.TotalMinutes);    //14399.983333333334
Console.WriteLine(TheDays.TotalSeconds);    //863999
Console.WriteLine(TheDays.TotalMilliseconds);   //863999000

2. DateTime

Console.WriteLine(DateTime.Now);            //2024/5/9 10:28:49
Console.WriteLine(DateTimeOffset.Now);      //2024/5/9 10:28:49 +08:00

Console.WriteLine(DateTime.UtcNow);         //2024/5/9 2:29:40      UTC标准时间
//格式化
string localDate = $"{DateTime.Now.Year}年{DateTime.Now.Month}月{DateTime.Now.Day}日 {DateTime.Now.Hour}:{DateTime.Now.Minute}:{DateTime.Now.Second}";
Console.WriteLine(localDate);   //2024年5月9日 10:33:21

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C# 语法总目录