오늘날짜로 부터 

let todays = new Date();
let yy = todays.getFullYear();
let mm = todays.getMonth()+1;
let dd = todays.getDate();

console.log("YY_"+yy, "MM_"+mm, "DD_"+dd);

그저께, 어제, 오늘, 내일, 모레 날짜구하기

https://relation.co.kr/images_board/board_system_publishing/92/