C#时间类型与Unix时间戳格式互转

1 将系统时间转换成UNIX时间戳

　　DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970,1,1));
　　DateTime dtNow = DateTime.Parse(DateTime.Now.ToString());
　　TimeSpan toNow = dtNow.Subtract(dtStart);
　　string timeStamp = toNow.Ticks.ToString();
　　timeStamp = timeStamp.Substring(0,timeStamp.Length - 7);

2将UNIX时间戳转换成系统时间

　　string timeStamp = "1144821796";
　　DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970,1,1));
　　long lTime = long.Parse(timeStamp + "0000000");
　　TimeSpan toNow = new TimeSpan(lTime);
　　DateTime dtResult = dtStart.Add(toNow);