日付と時間のチートシート

サンプル

00:00:00

コードをコピー

const d = new Date();
const year = d.getFullYear();
const month = d.getMonth();
const date = d.getDate();
let day = d.getDay();
result.textContent = `${year}年${month+1}月${date}日`;

const d = new Date();
const year = d.getFullYear();
const month = d.getMonth();
const date = d.getDate();
let day = d.getDay();
let reiwa = year - 2019;

if (reiwa === 0) {
  reiwa = '元';
}

result.textContent =
`令和${reiwa}年${month+1}月${date}日`;

const d = new Date();
const year = d.getFullYear();
const month = d.getMonth();
const date = d.getDate();
let day = d.getDay();
const youbi = ['日', '月', '火', '水', '木', '金', '土'];

result.textContent = `${year}年${month+1}月${date}日(${youbi[day]})`;

const d = new Date();
const h = d.getHours();
const m = d.getMinutes();

result.textContent =
` ${String(h).padStart(2,'0')}:${String(m).padStart(2,'0')}`;

const d = new Date();
let ap = 'AM';
let h = d.getHours();
const m = d.getMinutes();

if (h >= 13) {
  h -= 12;
  ap = 'PM';
}

result.textContent =
`${ap} ${String(h).padStart(2,'0')}:${String(m).padStart(2,'0')}`;

const d = new Date();
let ap = 'AM';
let h = d.getHours();
const m = d.getMinutes();
const s = d.getSeconds();

if (h >= 13) {
  h -= 12;
  ap = 'PM';
}

result.textContent =
` ${ap} ${String(h).padStart(2,'0')}:${String(m).padStart(2,'0')}
:${String(s).padStart(2,'0')}`;