Calculate the timestamp before and after two times.

        Private   Void Buttonsure_click ( Object  Sender, eventargs e ){  //  MessageBox. Show (this. usercontrolchoicetime1.getuserchoicetime (). tolocaltime (). tostring ()); Datetime userchoicetime = This  . Usercontrolchoicetime1.getuserchoicetime ();  //  Timespan ts1 = new timespan (userchoicetime. ticks );  // Timespan ts2 = new timespan (datetime. Now. ticks );  //  Timespan Ts = ts1.subtract (ts2). duration ();              If (Convertdatetimeint (userchoicetime)-convertdatetimeint (datetime. Now) < 0  ) {MessageBox. Show (  "  O (sort _ messages) O does not seem to be able to send emails back!  "  );}}  //  Convert datetime to Unix timestamp format         Public   Int  Convertdatetimeint (system. datetime time) {system. datetime starttime = Timezone. currenttimezone. tolocaltime ( New System. datetime ( 1970 , 1 , 1  ));  Return ( Int ) (Time- Starttime). totalseconds ;}