Playing with JavaScript String

I must clarify that since you have defined the variable timestamp this is not string, so to extract the substrings I have to convert it into the following code, however if it were timestamp = '20160525083000', we will get to line 2 where I convert to string the variable timestamp . Your string consists of 14 characters, the first 4 is the year of your date so substr (0,4) corresponds to this part, the next 2 are the month, which is represented by the substr (4,2), the Next 2 is the day, ie substr (6.2), and so on until the hour and minute part.

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);

I'll give you a way to do it using the date management library called Moments.js

var timestamp = 20160525083000;

var fecha = moment(timestamp, "YYYYMMDDhmmss");

var1 = fecha.format('DD-MM-YYYY');
var2 = fecha.format('h:mm');

console.log(var1);
console.log(var2);

<script src="https://momentjs.com/downloads/moment.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

  

Hi, I need some advice on this, it turns out that I have this   string

var timestamp = 20160525083000

The value you are assigning to timestamp is not a string, it is a number. To be treated as a string you should do the assignment by placing the value in single or double quotes, as follows:

var timestamp = '20160525083000';

There are several ways to extract substrings and then use these to "arm" other strings. Here are two of them:

var timestamp = '20160525083000';

var var1 = timestamp.substr(0,4) + '-' + timestamp.substr(4,2) + '-' + timestamp.substr(6,2);
console.info(var1);

var var2 = timestamp.substr(8,2) + ':' + timestamp.substr(10,2);
console.info(var2);

var timestamp = '20160525083000';

var var1 = timestamp.replace(/(\d{4})(\d{2})(\d{2})(\d{6})/, '$3-$2-$1');
console.info(var1);

var var2 = timestamp.replace(/(\d{8})(\d{2})(\d{2})(\d{2})/, '$2:$3');
console.info(var2);

Regarding the error, this happens because JavaScript does not have a syntax like oFecha(valor1,valor2) for variables. That syntax could be used for functions, but that should be treated in another question.

If the string timestamp will always have that format yyyymmddhhiiss you have a substring and store it in the variables you need.

  

STRING.substr (Int home, Length);

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);

I have done it in the following way ... Creating an object with the number of characters that each part of the date has ... minutes has 2 , year has 4 , and so on with all the parts.

Finally, I call the function that formats the date, I declare the variables var1 and var2 and I show them.

function formatear_fecha(timestamp)
{
  var texto=""+timestamp
  
  /* Objeto tiempo
    c es la cantidad de caracteres
    v es el valor
  */
  var t = {
    minutos:{c:2},
    horas  :{c:2},
    día    :{c:2},
    mes    :{c:2},
    año    :{c:4}
  }
  var posición = -2
  for(var i in t)
  {
    var siguiente = t[i].c
    t[i].v=texto.slice(posición-siguiente,posición)
    console.log(i,t[i].c)
    posición -= t[i].c
  }
  return [
    t.día.v+"-"+t.mes.v+"-"+t.año.v,
    t.horas.v+":"+t.minutos.v
  ]
}

var timestamp = 20160525083000

var fecha_formateada =  formatear_fecha(timestamp)
var var1 = fecha_formateada[0]
var var2 = fecha_formateada[1]

console.log("var1 es "+var1)
console.log("var2 es "+var2)