JS从日期输入开始减去1天

// 假设用户输入的日期是 '2023-10-05'
let userInputDate = '2023-10-05';

// 将字符串转换为Date对象
let date = new Date(userInputDate);

// 减去一天
date.setDate(date.getDate() - 1);

// 将结果转换回字符串格式
let resultDate = date.toISOString().split('T')[0];

console.log(resultDate); // 输出 '2023-10-04'

let date = new Date(userInputDate);
date = new Date(date.toISOString()); // 转换为UTC时间
date.setDate(date.getDate() - 1);
let resultDate = date.toISOString().split('T')[0];

function isValidDate(dateString) {
    let date = new Date(dateString);
    return !isNaN(date.getTime());
}

if (isValidDate(userInputDate)) {
    let date = new Date(userInputDate);
    date.setDate(date.getDate() - 1);
    let resultDate = date.toISOString().split('T')[0];
    console.log(resultDate);
} else {
    console.error('Invalid date format');
}