Get date before and after and query out free dates on range

When double booking in calender, the user get prompted to an dialog where Current day and +1 och -1 on day and then display the free dates, doing all this code wihout +1 om fromTime, and -1 on toTime, so for ex when the user adds 2014-12-10 12:00 to 2014-12-10 to 13:00 my query gets all items from 2014-12-09 from 08:00 to 2014-12-11 to 17:00 then is takes fromTime input 12 toTime input 13 and takes fromtime-toTime, to get the time out, in this case 1 hour.

var fromTime;
var toTime;
var listItemCustom;
var listItemtoDate;
var fromTimeConverted;
var toTimeConverted;
function checkFreebookingdateTime() {

getListCalender = document.getElementById('CalenderListDrop').value;
spHostUrl = decodeURIComponent(getQueryStringParameter('SPHostUrl'));
context = new SP.ClientContext.get_current();
parentContext = new SP.AppContextSite(context, spHostUrl);
web = parentContext.get_web();
list = web.get_lists().getByTitle(getListCalender);
context.load(list);

var fromDate08 = "T08:00:00Z";
var toDate17 = "T17:00:00Z";
listItemCustom = document.getElementById('datepicker').value;
var listItemFromTime = document.getElementById('timepicker').value;
listItemtoDate = document.getElementById('datepickerto').value;
var listItemToTime = document.getElementById('timepickerTo').value;
var result = listItemCustom + "T" + listItemFromTime + ":00" + "Z";
var result2 = listItemtoDate + "T" + listItemToTime + ":00" + "Z";
fromTime = new Date(result);
var numberToAddbefore = -1;
fromTime.setDate(fromTime.getDate() + numberToAddbefore);


fromTimeConverted = fromTime.toJSON().split('T')[0] + fromDate08;
toTime = new Date(result2);
var numberToAddafter = 1;
toTime.setDate(toTime.getDate() + numberToAddafter);


toTimeConverted = toTime.toJSON().split('T')[0] + toDate17;

var camlQuery = new SP.CamlQuery('<View><Query><Where><And><Geq><FieldRef Name=\'EventDate\' /><Value IncludeTimeValue=\'TRUE\' Type=\'DateTime\'>' + fromTimeConverted + '</Value></Geq><Leq><FieldRef Name=\'EndDate\' /><Value IncludeTimeValue=\'TRUE\' Type=\'DateTime\'>' + toTimeConverted + '</Value></Leq></And></Where></Query></View>');
camlQuery.set_viewXml();


collListItem = list.getItems(camlQuery);
context.load(collListItem);


context.executeQueryAsync(onQuerySucceeded, onQueryFailed);

}

function onQuerySucceeded() {

var dtstartCon = new Date(fromTimeConverted);
var dtEndCon = new Date(toTimeConverted);
var convertUtctoFromtime = new Date(dtstartCon.getTime() + dtstartCon.getTimezoneOffset() * 60 * 1000);
var start = new Date(convertUtctoFromtime);
var convertUtcToTime = new Date(dtEndCon.getTime() + dtEndCon.getTimezoneOffset() * 60 * 1000);
var end = new Date(convertUtcToTime);

var listItemEnumerator = collListItem.getEnumerator();
var bookedTimes = [];
var bookedFreeTimes = [];
while (listItemEnumerator.moveNext()) {
    var oListItem = listItemEnumerator.get_current();
    var eventDate = new Date(oListItem.get_item('EventDate'));
    var endDate = new Date(oListItem.get_item('EndDate'));


    bookedTimes.push([eventDate, endDate]);
}

while (start.getTime() < end.getTime()) {

    var mili = toTime - fromTime;

    var timeFree = true;
    var firstnewDate = (start.setTime(start.getTime()));
    var firstNewDt = new Date(firstnewDate);
    var newDate = start.setTime(start.getTime()+mili);
    start = new Date(newDate);

    for (var i = 0; i < bookedTimes.length; i++) {
        var date = bookedTimes[i][0];
        var date2 = bookedTimes[i][1];
        if (firstNewDt.getTime() != date.getTime() && start.getTime() != date2.getTime()) {


        } else {
            bookedTimes.splice(i, 1);
            timeFree = false;
            break;
        }

    }

    if (timeFree) {

        var from = new Date(firstNewDt);
        var to = new Date(start);
        var day = from.getDate();

        if (from.getHours() <= 16 && from.getMinutes() <= 30 && from.getHours() >= 8 && !(from.getDay() == 0 || from.getDay() == 6)) {

            if (day <= 9) {
                day = "0" + day;
            }
            var month = from.getMonth() + 1;
            if (month <= 9) {

                month = "0" + month;
            }
            var year = from.getFullYear();
            var hours = from.getHours();
            if (hours < 10) {
                hours = "0" + hours;
            }

            var minutes = from.getMinutes();
            if (minutes < 30) {
                minutes = "0" + minutes;
            }


            var dayto = to.getDate();
            if (dayto <= 9) {
                dayto = "0" + dayto;
            }
            var monthto = to.getMonth() + 1;
            if (monthto <= 9) {
                monthto = "0" + monthto;
            }
            var yearto = to.getFullYear();
            var hoursto = to.getHours();
            if (hoursto < 10) {
                hoursto = "0" + hoursto;
            }
            var minutesto = to.getMinutes();
            if (minutesto < 30) {
                minutesto = "0" + minutesto;
            }
            bookedFreeTimes.push(year + "-" + month + "-" + day + " " + hours + ":" + minutes + " , " + yearto + "-" + monthto + "-" + dayto + " " + hoursto + ":" + minutesto);
        }
    }

}


$(function () {
    $("#dialog").dialog({
        autoOpen: false,
        modal: true,
        width: 400,
        height: 400,

    });
    var bokupptagentext = document.createTextNode("Din bokning är upptagen här nedan listas");
    var createpupptagentext = document.createElement("p");

    var node = document.createTextNode("Lediga tider");
    var para = document.createElement("p");
    para.style.fontSize = "14px";
    var selectList = document.createElement("select");
    var t = document.createTextNode("Boka möte");
    var createButton = document.createElement("button");
    var buttonElementcreate = document.getElementById("buttonResultpopup");
    while (buttonElementcreate.hasChildNodes()) {
        buttonElementcreate.removeChild(buttonElementcreate.firstChild);
    }
    var element = document.getElementById("textresultfree");
    while (element.hasChildNodes()) {
        element.removeChild(element.firstChild);
    }
    var myDiv = document.getElementById("myDivResult");
    while (myDiv.hasChildNodes()) {
        myDiv.removeChild(myDiv.firstChild);
    }

    var myDiv2 = document.getElementById("bokningupptagentext");
    while (myDiv2.hasChildNodes()) {
        myDiv2.removeChild(myDiv2.firstChild);
    }
    createButton.appendChild(t);
    createButton.onclick = createbookingpopup;
    buttonElementcreate.appendChild(createButton);
    para.appendChild(node);
    element.appendChild(para);
    myDiv.appendChild(selectList);
    createpupptagentext.appendChild(bokupptagentext);
    myDiv2.appendChild(createpupptagentext);


    $("#dialog").dialog("open");
    var free = "";
    for (var j = 0; j < bookedFreeTimes.length; j++) {

        free = bookedFreeTimes[j];
        var array = new Array(free);

        for (var k = 0; k < array.length; k++) {

            var option = document.createElement("option");

            option.text = array[k];
            option.value = array[k];
            selectList.appendChild(option);

        }
    }

}

    );

}

function onQueryFailed(sender, args) {

alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());

}

Right not it adds time 2014-12-09 08:00 2014 12-11 09:00 And 2014-12-11 09 2014-12-13 10:00

to my select option tag.

Wihout only getting the current day, works fine but when trying to use also get 1 day before and one day after, it dont get the right values