Long和Datetime转换

    public static long ConvertDataTimeLong(DateTime dt)
    {
      DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
      TimeSpan toNow = dt.Subtract(dtStart);
      long timeStamp = toNow.Ticks;
      timeStamp = long.Parse(timeStamp.ToString().Substring(0, timeStamp.ToString().Length - 4));
      return timeStamp;
    }
     
    public static DateTime ConvertLongDateTime(long d)
    {
      DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
      long lTime = long.Parse(d + "0000");
      TimeSpan toNow = new TimeSpan(lTime);
      DateTime dtResult = dtStart.Add(toNow);
      return dtResult;
    }