static void Main(string[] args)
        {
            //将本地时间转换为美国标准中部时间
            DateTime dt=TimeZoneInfo.ConvertTimeToUtc(DateTime.Now, TimeZoneInfo.Local);
            Console.WriteLine(dt.ToString());

            dt = TimeZoneInfo.ConvertTimeFromUtc(dt, TimeZoneInfo.FindSystemTimeZoneById("Central America Standard Time"));
            Console.WriteLine(dt.ToString());




            //列举所有支持的时区列表
            ReadOnlyCollection<TimeZoneInfo> lst=TimeZoneInfo.GetSystemTimeZones();
            foreach(TimeZoneInfo tzi in lst)
            {
                Console.WriteLine(tzi.Id);
            }

        }