Hongtting

var startDate = '2019-02-01';
var startDateArr = startDate.split('-');
var endDate = search_day_1;  // 비교데이터 
var endDateArr = endDate.split('-');

var startDateCompare = new Date(startDateArr[0], parseInt(startDateArr[1])-1, startDateArr[2]);
var endDateCompare = new Date(endDateArr[0], parseInt(endDateArr[1])-1, endDateArr[2]);

console.log(" startDateCompare.getTime() : "+startDateCompare.getTime());
console.log(" endDateCompare.getTime() : "+endDateCompare.getTime());

if(startDateCompare.getTime() > endDateCompare.getTime())
{
    alert("검색의 시작날짜는 2019-02-01 이전날은 \n 확인 할수 없습니다.");
}
else
{
    location.href = '원하는곳으로';
}