Compare Two Dates in javascript

  

var firstDate=new Date();

firstDate.setFullYear(start[0],(start[1] - 1 ),start[2]);

var secondDate=new Date();

secondDate.setFullYear(end[0],(end[1] - 1 ),end[2]);

if(firstDate > secondDate)

{

alert("first date is greater");

}

else

{

alert("second date is greater");

}