Date comparision javascript

I am facing some problem in comparing dates in javascript.

I have dates in "1-Dec-2014" & "19-Nov-2014" format.

While I compared the dates like

var stDate='19-Nov-2014';
var endDate='1-Dec-2014';
if(stDate < endDate){
    console.log('Hi');
}else{
console.log('Bye');
}

In out put it shows me "Bye", but it should be "Hi".

What I observed it this comparison compares the date (initial argument) in respective dates.

I am very new to javascript . I am not getting any way to solve this .

Please help me.