I want to compare 3 dates in javascript

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Javascript

I have 3 Dates in javascript

1)

var vDate = document.getElementById('AppliedFor' + RowNo).value;

it gives date as

"25/May/2018"

2)

var HDNSessionFromDate1 = document.getElementById('HDNSessionFromDate').value;

it Gives me Date as

"01/Apr/2018"

3)

var HDNSessionToDate = document.getElementById('HDNSessionToDate').value;

it gives Date as

"31/Mar/2019"

now I want To check my date

vDate should be in between <pre>HDNSessionFromDate1 

and

HDNSessionToDate 

What I have tried:

I have 3 Dates in javascript

1)  <pre>var vDate = document.getElementById('AppliedFor' + RowNo).value;

it gives date as

"25/May/2018"

2)

var HDNSessionFromDate1 = document.getElementById('HDNSessionFromDate').value;

it Gives me Date as

"01/Apr/2018"

3)

var HDNSessionToDate = document.getElementById('HDNSessionToDate').value;

it gives Date as

"31/Mar/2019"

now I want To check my date

vDate should be in between <pre>HDNSessionFromDate1 

and

HDNSessionToDate 

now I am converting it into mm/dd/yyyy format for that I have function
GetNewFormat()

var temp = GetNewFormat(vDate);

here I am getting Date  as 05/25/2018

        temp = temp.split("/");
        var month = parseInt(temp[0]);
        var day = parseInt(temp[1]);
        var year =parseInt(temp[2]);


        var temp1 = GetNewFormat(HDNSessionFromDate1);

here I am getting Date  as "04/01/2018"

        temp1 = temp1.split("/");
        var month1 = parseInt(temp1[0]);
        var day1 = parseInt(temp1[1]);
        var year1 = parseInt(temp1[2]);

        var temp2 = GetNewFormat(HDNSessionToDate);

     here I am getting Date  as  "03/31/2019"       

        temp2 = temp2.split("/");
        var month2 =parseInt(temp2[0]);
        var day2 =parseInt(temp2[1]);
        var year2 =parseInt(temp2[2]);
        alert(year2);
        var vDate1 = new Date(year, month, day);
        alert(vDate1);

now I have

var vDate1 = new Date(year, month, day);
        var vDate2=new Date(year1, month1, day1);
        var vDate3=new Date(year2, month2, day2);
        alert(vDate1);


        if (vDate1 >= vDate2 && vDate1 <= vDate3)
        {
            lblresult.innerHTML = "Please Enter Valid Date"
                lblresult.className = 'Red';
                document.getElementById('AppliedFor' + RowNo).focus();
                return false;
        }

but It Gives error at
var vDate1 = new Date(year, month, day);



I created Function which gives date in following format


<pre>function GetNewFormat(datevar) {
    var mon;
    var m1 = datevar.substring(3, 6);

    switch (m1.toLowerCase()) {
        case "jan":
            mon = 01;
            break;
        case "feb":
            mon = 02;
            break;
        case "mar":
            mon = 03;
            break;
        case "apr":
            mon = 04;
            break;
        case "may":
            mon = 05;
            break;
        case "jun":
            mon = 06;
            break;
        case "jul":
            mon = 07;
            break;
        case "aug":
            mon = 08;
            break;
        case "sep":
            mon = 09;
            break;
        case "oct":
            mon = 10;
            break;
        case "nov":
            mon = 11;
            break;
        case "dec":
            mon = 12;
            break;
    }
    datevar = mon + "/" + datevar.substring(0, 3) + datevar.substring(7);
    return datevar;
}