I am trying to compare dates  to allow the clone functionality to work. I have following javascript on a custom button but it doesnt work.
var SCAssgn = "{!Quote__c.CreatedDate}"; 
var mydate = new Date(SCAssgn); 
alert(mydate); 
var cutoff = new Date("10/6/2017") 
alert(cutoff) ; 
if(SCAssgn < cutoff ) 
{ 
alert("You cannot clone this quote. Please create a new Quote"); 
} 
else { 
cloneQuote(); 
}