JS与当前系统日期时间比较大小

//输入时间早于当前系统时间
function smallerThanNow(time){
	var myDate = new Date();
	//2012年12月30日 13:13:00
	var now = myDate.toLocaleDateString()+" "+myDate.toLocaleTimeString();
	//2012-12-30 13:13:00
	now = now.replace("年","-").replace("月","-").replace("日",""); 
	now = new Date(now.replace(/-/g, "/")); //2012/12/30 13:13:00
	time = new Date(time.replace(/-/g, "/"));
	if(time==null || Date.parse(time) - Date.parse(now) < 0){
		return true;
	}else{
		return false;
	}
}