//創建date

var nowDate = new Date();

//添加天數

nowDate.setDate(nowDate.getDate() + 1);

//添加周 添加周用添加天的方式，來添加七天，即為一周

nowDate.setDate(nowDate.getDate() + 7);

//添加月數

nowDate.setMonth(nowDate.getMonth() + 1);

//添加年數

nowDate.setYear(nowDate.getFullYear() + 1);

打印格式為年月日時分秒

const year = nowDate.getFullYear();

const month = (nowDate.getMonth() + 1).toString().padStart(2, '0');

const day = nowDate.getDate().toString().padStart(2, '0');

const hours = nowDate.getHours().toString().padStart(2, '0');

const minutes = nowDate.getMinutes().toString().padStart(2, '0');

const seconds = nowDate.getSeconds().toString().padStart(2, '0');

console.log(`${year}-${month}-${day} ${hours}:${minutes}:${seconds}`);