C#Datetime和long之间转换

        //long转DateTime
        private DateTime ConvertLongToDateTime(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;
        }
        //DateTime类型转成long 
        private long ConvertDataTimeToLong(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 / 1000;
        }

        //long转DateTime        private DateTime ConvertLongToDateTime(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;        }        //DateTime类型转成long         private long ConvertDataTimeToLong(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 / 1000;        }