javascript 날짜비교/일수 차이 계산

http://jwchoi85.tistory.com/230

var sNowDay = "2016-07-25";
var sWinDay = "2016-08-01";
var todayArray = sNowDay.split("-");  
var todayObj = new Date(todayArray[0], Number(todayArray[1])-1, todayArray[2]);

var winArray = sWinDay.split("-");  
var winObj = new Date(winArray[0], Number(winArray[1])-1, winArray[2]);
var nBetweenCnt = (todayObj.getTime() - winObj.getTime())/1000/60/60/24;  

if(nBetweenCnt < 0){
	alert(nBetweenCnt +"일 남음");
	return;
}else{
	return;
}