js date 格式转换

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

const now = new Date();
console.log(formatDate(now)); // 输出格式如 "2023-04-01"

const now = new Date();
console.log(now.toLocaleDateString()); // 输出可能如 "2023/4/1" 或 "4/1/2023"，取决于本地设置

function customFormatDate(date, format) {
    const map = {
        'Y': date.getFullYear(),
        'M': String(date.getMonth() + 1).padStart(2, '0'),
        'D': String(date.getDate()).padStart(2, '0'),
        'H': String(date.getHours()).padStart(2, '0'),
        'm': String(date.getMinutes()).padStart(2, '0'),
        's': String(date.getSeconds()).padStart(2, '0')
    };
    return format.replace(/Y|M|D|H|m|s/g, matched => map[matched]);
}

const now = new Date();
console.log(customFormatDate(now, 'YYYY-MM-DD HH:mm:ss')); // 输出格式如 "2023-04-01 12:34:56"

npm install date-fns

import { format } from 'date-fns';

const now = new Date();
console.log(format(now, 'yyyy-MM-dd HH:mm:ss')); // 输出格式如 "2023-04-01 12:34:56"