DateTime and long are mutually rotating

DateTime goes Long:

 Public Static LongGetdatelong (ObjectTime ) {DateTime Epoc= TimeZone.CurrentTimeZone.ToLocalTime (NewDateTime (1970,1,1)); TimeSpan Delta=NewTimeSpan (); if(Time isDateTime) Delta=(DateTime).            Subtract (EPOC); Else if(Time is string) Delta=DateTime.Parse (time. ToString ()).            Subtract (EPOC); Else                Throw NewArgumentOutOfRangeException ("time format error. 1"); if(Delta. TotalMilliseconds <0)                Throw NewArgumentOutOfRangeException ("time format error. 2"); LongTicks = (Long) Delta.            TotalMilliseconds; returnticks; }

Long turns datetime:

 Public Static DateTime Getdatefromlong (long  ticks)        {            var date = TimeZone.CurrentTimeZone.ToLocalTime (new DateTime (197011));             = date. Addmilliseconds (ticks);             return date;        }

Common errors on the Web:

New DateTime (197011);

DateTime and long are mutually rotating