JSFiddle - React, Tailwind, and code Playground

HTML

<button id="clean">Clean duplicate records</button>


   
<div id='output'></div>

JavaScript

var arr = {"Productos" : [
   {"Title":"Grabador de voz ISD1932","Results": [
      {"Stock":1,"Price":11.4,"Fecha":"18-8-2014:3:36"},
      {"Stock":1,"Price":12.4,"Fecha":"18-8-2014:3:38"},
      {"Stock":1,"Price":12.4,"Fecha":"19-8-2014:0:40"},
      {"Stock":1,"Price":12.4,"Fecha":"19-8-2014:21:46"},
      {"Stock":1,"Price":12.4,"Fecha":"21-8-2014:22:4"},
      {"Stock":1,"Price":12.4,"Fecha":"22-8-2014:0:40"},
      {"Stock":1,"Price":12.4,"Fecha":"23-8-2014:0:48"},
      {"Stock":1,"Price":12.4,"Fecha":"23-8-2014:13:56"},
      {"Stock":1,"Price":12.4,"Fecha":"23-8-2014:13:56"},
      {"Stock":1,"Price":12.4,"Fecha":"23-8-2014:13:56"},
      {"Stock":1,"Price":12.4,"Fecha":"23-8-2014:13:56"}, 
      {"Stock":1,"Price":12.4,"Fecha":"23-8-2014:13:56"},
      {"Stock":1,"Price":12.4,"Fecha":"23-8-2014:13:56"}],
    "id":"4a1e90d7-e578-4bd5-b888-38c7bbfb4af5"}]};

var data = arr.Productos[0].Results;

var printArr = function() {
    var out = "";
    for(var i = 0; i != data.length; i++) {    
        var stock = data[i].Stock;
        var price = data[i].Price;
        var fecha = data[i].Fecha;
        out += i  + " " + stock + " " + price + " "  + fecha + "<br>";
    }
    $('#output').html(out);
}

var cleanRecords = function() {
    for(var i = 0; i != data.length; i++) {    
        var stock = data[i].Stock;
        var price = data[i].Price;
        var fecha = data[i].Fecha;
        if( i < data.length - 1 && fecha === data[i + 1].Fecha) {
            data.splice(i + 1,1);
            i--;
        }
    }
    printArr();
}

printArr();

$('#clean').on('click', cleanRecords);