JSFiddle - React, Tailwind, and code Playground

JavaScript

function stringToDate(s) {
    var dateParts = s.split(' ')[0].split('/');
    var timeParts = s.split(' ')[1].split(':');
    var d = new Date(dateParts[0], --dateParts[1], dateParts[2]);
    d.setHours(timeParts[0], timeParts[1])
    return d
}

function test() {
    var a = '28/01/2015 00:00';
    var b = '27/01/2015 00:00';
    alert(stringToDate(a) - stringToDate(b));
}

$(function(){
    test();
});