console.clear();

const now = new Date();

const dateOptions = {
  year: 'numeric',
  month: 'numeric',
  day: 'numeric',
};

const dateOptions2 = {
  year: 'numeric',
  month: '2-digit',
  day: '2-digit',
};

const dateOptions3 = {
  month: 'long',
  day: 'numeric'
};

const timeOptions = {
  hour12: false,
  hour: '2-digit',
  minute: '2-digit',
};

console.log( '目前時間是 ' + now.toLocaleString('zh-TW', {...dateOptions, ...timeOptions}) );
console.log( now.toLocaleString('zh-TW', dateOptions2) );
console.log( now.toLocaleString('zh-TW', dateOptions2).replace(/\//g, '-'));
console.log( '今天是' + now.toLocaleString('zh-TW', { weekday: 'long' }) );

const timeStr = now.toLocaleString('zh-TW', timeOptions);
console.log(`今天是${now.toLocaleString('zh-TW', dateOptions3)}，時間為 ${timeStr}`);
console.log(`今天是${toC(now.getMonth() + 1)}月${toC(now.getDate())}日，時間為 ${timeStr}`);

function toC(s) {
  const upperCaseNumber = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十'];
  let n = Number(s);
  if (n < 10) {
    return upperCaseNumber[n];
  } else {
    let str = '';
    Math.floor(n / 10) === 1 ? str += '十' : str += upperCaseNumber[Math.floor(n / 10)] + '十';
    if (n % 10 === 0) {
      return str;
    }
    return str + upperCaseNumber[n % 10];
  }
}