C#/.NET怎么样将UTC时间转换成美国东部时间(EST)

C#/.NET将UTC时间转换成美国东部时间(EST)时，我们需要使用到.NET Framework中与时区有关的TimeZoneInfo类的静态方法：FindSystemTimeZoneById("时区名称")；然后再用TimeZoneInfo的静态方法：TimeZoneInfo.ConvertTimeFromUtc()将UTC时间转换成指定时区中的时间，具体示例代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      TimeZoneInfo easternZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
      DateTime easternTime = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, easternZone);
      Console.WriteLine("Local Time:{0}", DateTime.Now);
      Console.WriteLine("UTC Time:{0}", DateTime.UtcNow);
      Console.WriteLine("EST Time:{0}", easternTime);

      Console.ReadKey();
    }
  }
}

运行结果如下： 如果我们还需要将上例转换得到的EST时间格式化成ISO 8601格式的，又应该怎么做呢？答案有很多种，这里列举其中一种，即使用DateTime.ToString()方法，还是把完整的示例代码贴出来：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      TimeZoneInfo easternZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
      DateTime easternTime = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, easternZone);
      Console.WriteLine("Local Time:{0}", DateTime.Now);
      Console.WriteLine("UTC Time:{0}", DateTime.UtcNow);
      Console.WriteLine("EST Time:{0}", easternTime);

      Console.WriteLine("{0}", easternTime.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff'z'"));

      Console.ReadKey();
    }
  }
}

运行结果如下图：