js 年月日 月日格式化

function formatDate(date, format) {
    const year = date.getFullYear();
    const month = (date.getMonth() + 1).toString().padStart(2, '0');
    const day = date.getDate().toString().padStart(2, '0');

    if (format === 'YYYY-MM-DD') {
        return `${year}-${month}-${day}`;
    } else if (format === 'MM/DD') {
        return `${month}/${day}`;
    }
}

const today = new Date();
console.log(formatDate(today, 'YYYY-MM-DD')); // 输出类似 2023-10-05
console.log(formatDate(today, 'MM/DD'));     // 输出类似 10/05

function formatDateWithIntl(date, locale, options) {
    return new Intl.DateTimeFormat(locale, options).format(date);
}

const today = new Date();
console.log(formatDateWithIntl(today, 'en-US', { year: 'numeric', month: '2-digit', day: '2-digit' })); // 输出类似 10/05/2023
console.log(formatDateWithIntl(today, 'zh-CN', { year: 'numeric', month: '2-digit', day: '2-digit' })); // 输出类似 2023/10/05

const month = (date.getMonth() + 1).toString().padStart(2, '0'); // 确保月份为两位数
const day = date.getDate().toString().padStart(2, '0');         // 确保日期为两位数