const today = new Date("2022-05-12"); //오늘 날짜 입력
const holiday = new Date("2022-10-01"); //공휴일 날짜 입력
  
const  diffDate= today.getTime() - holiday.getTime();
  
const  dday= Math.abs(diffDate / (1000 * 3600 * 24));
  
console.log(dday);