[js] 날짜

    let today = new Date(); // Thu Oct 29 2020 13:29:51 GMT+0900 (대한민국 표준시)

    let year = today.getFullYear(); // 년도
    let month = today.getMonth() + 1;  // 월
    let date = today.getDate();  // 날짜

    let date_str = year+month+date;