How to find the date is greater than or not using javascript?

function Date_Diff()
{
var dt1=document.getElementById('TextBox1').value;//Start Date
var dt2=document.getElementById('TextBox2').value;//End Date
dt1=dt1.split('/');
dt2=dt2.split('/');
var st=new Date(dt1[2],dt1[0],dt1[1]);
var ed=new Date(dt2[2],dt2[0],dt2[1]);
if (ed > st)
alert('True');
else
alert('False');
}