Difference between dates in months javascript [duplicate]

See if this is ... The accepted format is with bars: yyyy / mm / dd or dd / mm / yyyy or commas yyyy, mm, dd

<input type="date" id="dt1">Data 1</br>
<input type="date" id="dt2">Data 2</br>
<input type="text" id="result">Resultado</br>
<input type="submit" value="calcular" onclick="calcular();">
<script>
function calcular(){
var dt1 = document.getElementById("dt1").value; 
var dt2 = document.getElementById("dt2").value; 

var data1 = new Date(dt1); 
var data2 = new Date(new Date(dt2));
var total = (data2.getFullYear() - data1.getFullYear())*12 + (data2.getMonth() - data1.getMonth());
document.getElementById("result").value = total;
}
</script>

Anything says agent fits.

If any of the answers are valid, you could validate, under the green icon, below the evaluation arrows.     

You need to instantiate the dates in the javascript pattern.

var DateDiff = {

inMonths: function(d1, d2) {
d1 = new Date(d1);
d2 = new Date(d2);
var d1Y = d1.getFullYear();
var d2Y = d2.getFullYear();
var d1M = d1.getMonth();
var d2M = d2.getMonth();

return (d2M+12*d2Y)-(d1M+12*d1Y);
}}
var dataInicio= document.getElementById("dataInicio").value;
var dataFinal = document.getElementById("dataFinal").value;
document.write("<br />Numero de <b>months</b> since "+dataInicio+": "+DateDiff.inMonths(dataInicio, dataFinal));

Your date must be in a pattern accepted by the javascript "yyyy-mm-dd" or "mm / dd / yyyy", for example, to use new Date ().