js字符串日期格式

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

const now = new Date();
console.log(formatDate(now)); // 输出格式如：2023-10-05

const isoString = '2023-10-05T14:48:00.000Z';
const date = new Date(isoString);
console.log(date); // 输出Date对象

function customFormatDate(date) {
    const year = date.getFullYear();
    const month = (date.getMonth() + 1).toString().padStart(2, '0');
    const day = date.getDate().toString().padStart(2, '0');
    return `${day}/${month}/${year}`;
}

const now = new Date();
console.log(customFormatDate(now)); // 输出格式如：05/10/2023

// 使用date-fns
import { parseISO, format } from 'date-fns';

const isoString = '2023-10-05T14:48:00.000Z';
const date = parseISO(isoString);
console.log(format(date, 'yyyy-MM-dd')); // 输出：2023-10-05

const isoString = '2023-10-05T14:48:00.000Z';
const date = new Date(isoString);
console.log(date.toISOString()); // 输出UTC时间

function isValidDate(dateString) {
    const regex = /^\d{4}-\d{2}-\d{2}$/;
    if (!regex.test(dateString)) return false;
    const date = new Date(dateString);
    return !isNaN(date.getTime());
}

console.log(isValidDate('2023-10-05')); // true
console.log(isValidDate('2023/10/05')); // false