*오늘 날짜 구하기
var today = new Date();
// 2021-02-19
console.log("today : " + today) ==> Feb 19 2021 00:00:00 GMT+0827(대한민국 표준시)
*어제 날짜 구하기
//2020-02-19
var today = new Date();
var yesterday = new Date(today.setDate(today.getDate() - 1));
console.log("yesterday : " + yesterday )
// Feb 18 2021 00:00:00 GMT+0827( 대한민국 표준시 )
* 내일 날짜 구하기
//2020-02-19
var today = new Date();
var tomorrow = new Date(today.setDate(today.getDate() + 1));
console.log("tomorrow : " + tomorrow )
// Feb 20 2021 00:00:00 GMT+0827( 대한민국 표준시 )
*한달전, 일년전 날짜 구하기
//2020-02-19
var today = new Date();
var monthAgo = new Date(today.setDate(today.getMonth() - 1));
console.log("monthAgo : " + monthAgo )
// Jan 19 2021 00:00:00 GMT+0827( 대한민국 표준시 )
var yearAgo = new Date(today.setDate(today.getYear() - 1));
console.log("yearAgo : " + yearAgo )
// Feb 19 2020 00:00:00 GMT+0827( 대한민국 표준시 )