find no of days between 2 selected dates in jquery - php

Question

I need to find number of days between 2 selected dates. I have tried the following code but it returns error results for some dates.
function getDateObject(str) {
var arr = str.split("-");
return new Date(arr[0], arr[1], arr[2]);
}
$('#from_date,#to_date').bind("change paste keyup", function() {
var date1 = getDateObject($('#from_date').val());
var date2 = getDateObject($('#to_date').val());
var days = (date2 - date1) / 86400000;
alert(days); //it returns -1 for from:2016-01-31 - to:2016-02-01.
//other dates like from:2016-01-13 - to:2016-01-14 returns 1 correctly
}
please help me to resolve this issue.

Answer 1

You need to parse your dates correctly, currently:
new Date("2016", "01", "31");
will give
Wed Mar 02 2016 00:00:00 GMT+0530 (IST)
Just this will work fine
// str should be in yy-mm-dd
function getDateObject(str) {
return new Date(str);
}

Answer 2

finally I found a solution.
function getDateObject(str) {
var arr = str.split("-");
return new Date(arr[0], arr[1]-1, arr[2]);//just added -1 in arr[1] that is month.
}
$('#from_date,#to_date').bind("change paste keyup", function() {
var date1 = getDateObject($('#from_date').val());
var date2 = getDateObject($('#to_date').val());
var days = (date2 - date1) / 86400000;
alert(days);
}
this gave me the output I needed.
Thanks you all tried to help me.