Promise for forEach wit SetTimOut in resolve

const fs = require('fs');
console.time('chunk_execute_time');
var now = new Date();
var daysOf = [];
var game = "IL"
var timerId = 0;
var outarray = [];
const datafile = __dirname + '/files/file.txt';

for (var d = new Date(2017, 0, 1); d <= now; d.setDate(d.getDate() + 1)) {
    daysOf.push(new Date(d).toLocaleDateString().replace(/-([0-9]{1})(\s|-|$)/, '-0$1$2').replace(/-([0-9]{1})(\s|-|$)/, '-0$1$2'));
}

function chunker(n) {
    return function (p, c, i) {
        (p[i / n | 0] = p[i / n | 0] || []).push(c);
        return p;
    };
}

var chunks = daysOf.reduce(chunker(50), []);

// chunks.forEach(chunk => {
//     var fromDate = chunk[0];
//     var toDate = chunk[chunk.length - 1];
//     filename = __dirname + `/files/${game}-fromDate-${fromDate}-toDate-${toDate}.json`;
// });

console.timeEnd('chunk_execute_time');

function sleep(milliseconds) {
    var start = new Date().getTime();
    for (var i = 0; i < 1e7; i++) {
        if ((new Date().getTime() - start) > milliseconds) {
            break;
        }
    }
}

const addDrawObj = (obj) => {
    outarray.push(obj);
};



var getPage = (item, callback) => {
    sleep(15);
    fs.readFile(datafile, 'utf8', function (err, contents) {
        callback(contents);
    });
}

const parsePage = (data,item) => {
    sleep(15);
    var out = JSON.parse(data);
    out[0].date = item+' 00:00:01';
    out[1].date = item+' 00:00:02';
    out[2].date = item+' 00:00:03';
    return (out);
}

// pętla główna dla jednego kawałka tablicy
console.time('loop_time');
var days = chunks[0];
  var go = new Promise((resolve, reject) => {
        days.forEach((item) => {
            getPage(item, (html) => {
                let data = parsePage(html,item);
                    addDrawObj(data);
            });
        });

        setTimeout(function() {
            resolve();
          }, 30); // działa od minimum 3ms ???

    });

// go.then((value) => {
//     console.log(value);
//     //console.log(outarray);
// });

Promise.all([go]).then(() => {
    if (outarray.length>0) {
        outarray.sort((a,b)=>{
            let da = new Date(a[0].date);
            let db = new Date(b[0].date);
            return da-db;
        })
        }
    outarray.forEach((element,idx) => {
        if (idx>45)
        console.log(element);
    });
    console.log('length data:'+outarray.length);
    console.timeEnd('loop_time');
});