var timestamp = 20160525083000

var1= 25-05-2016

var2= 08:30

var oFecha = timestamp;
var fecha_f = oFecha(0,7);

var oHora = timestamp;
var Hora = timestamp(8,11);

var timestamp = 20160525083000;
timestamp = timestamp.toString();
var fecha = timestamp.substr(6,2)+ "-" +
            timestamp.substr(4,2)+ "-" +
            timestamp.substr(0,4);

var hora = timestamp.substr(8,2) + ":" +
            timestamp.substr(10,2);

var timestamp = 20160525083000

var timestamp = '20160525083000';

var timestamp = 20160525083000; //numerico
timestamp = timestamp.toString(); // String

var fecha_f = timestamp.substr(6,2) + "-" + timestamp.substr(4,2) + "-" + timestamp.substr(0,4);
var Hora = timestamp.substr(8,2)+":"+timestamp.substr(10,2);