js日期yyyy mm dd

// 获取当前日期
let today = new Date();

// 格式化为 "yyyy mm dd"
let year = today.getFullYear();
let month = String(today.getMonth() + 1).padStart(2, '0'); // 月份从0开始，需要加1
let day = String(today.getDate()).padStart(2, '0');

let formattedDate = `${year} ${month} ${day}`;
console.log(formattedDate); // 输出类似 "2023 04 30"

function isValidDate(dateStr) {
    let regex = /^\d{4} \d{2} \d{2}$/;
    if (!regex.test(dateStr)) return false;
    
    let [year, month, day] = dateStr.split(' ').map(Number);
    let date = new Date(year, month - 1, day);
    
    return date.getFullYear() === year && date.getMonth() + 1 === month && date.getDate() === day;
}

console.log(isValidDate("2023 04 30")); // true
console.log(isValidDate("2023 13 30")); // false