C # time format converted to timestamp (reciprocal)

The timestamp is defined as the total number of seconds from GMT January 01, 1970 00:00 00 seconds (Beijing time January 01, 1970 08:00 00 seconds).

<summary>
///time stamp timestamp
///</summary>
///<returns></returns>
private int Getcreatetime ()
{
    datetime datestart= new DateTime (1970,1,1,8,0,0);
    Return Convert.ToInt32 ((Datetime.now-datestart). totalseconds);
}

</pre><p><pre name= "code" class= "CSharp" >///<summary>
///timestamp to C # format time
///</ summary>
///<param name= "TimeStamp" ></param>
///<returns></returns>
Private datetime GetTime (string timeStamp)
{
  DateTime Dtstart = TimeZone.CurrentTimeZone.ToLocalTime (new DateTime (1970, 1, 1));
  Long ltime = long. Parse (TimeStamp + "0000000");
  TimeSpan Tonow = new TimeSpan (ltime); Return Dtstart.add (Tonow);
}