i am trying to insert toISOString() inside

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Javascript

for ex 2014-12-13T20:00:00Z to 2014-12-14T21:00:00Z
In an Date get error invalid date

var strArray = listItemFromAndToDate.split(' , ');
        var dateAndTimeFrom = strArray[0];
        var dateAndTimeTo = strArray[1];

        var fromArray = dateAndTimeFrom.split(' ');
        var toArray = dateAndTimeTo.split(' ');

        var fromdate = fromArray[0]; // year month day
        var fromtime = fromArray[1]; // hours minutes
        var toDate = toArray[0];  // yearsto monthto dayto
        var totime = toArray[1]; // hoursto hoursfrom


        var resultnew = fromdate + "T" + fromtime + ":00" + "Z";
        var result2New = toDate + "T" + totime + ":00" + "Z";
        var fromTimenew = new Date(resultnew);
        var toTimenew = new Date(result2New);

bookedFreeTimes.push(year + "-" + month + "-" + day + " " + hours + ":" + minutes + " , " + yearto + "-" + monthto + "-" + dayto + " " + hoursto + ":" + minutesto);

here is my string that i splitting my resultnew and result2new get as in the string in the top, but when trying to add new date to them i get invalid date?

But another place i have 2 datepicker were i select date and time to and from.

var listItemCustom = document.getElementById('datepicker').value;
        var listItemFromTime = document.getElementById('timepicker').value;
        var 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";
        var fromTime = new Date(result);
        var toTime = new Date(result2);

Like this works, i dont get invalid date here , and the string are displayed the same.