js date 相差多少天

function daysBetween(date1, date2) {
    // 将日期转换为毫秒数
    const oneDay = 24 * 60 * 60 * 1000; // 一天的毫秒数
    const diffDays = Math.round(Math.abs((date2 - date1) / oneDay));
    return diffDays;
}

// 示例使用
const date1 = new Date('2023-10-01');
const date2 = new Date('2023-10-10');
console.log(daysBetween(date1, date2)); // 输出: 9

function daysBetweenUTC(date1, date2) {
    const oneDay = 24 * 60 * 60 * 1000;
    const diffDays = Math.round(Math.abs((date2.getTime() - date1.getTime()) / oneDay));
    return diffDays;
}

const date1UTC = new Date('2023-10-01T00:00:00Z');
const date2UTC = new Date('2023-10-10T00:00:00Z');
console.log(daysBetweenUTC(date1UTC, date2UTC)); // 输出: 9

const moment = require('moment');

function daysBetweenWithMoment(dateStr1, dateStr2) {
    const date1 = moment(dateStr1);
    const date2 = moment(dateStr2);
    return date2.diff(date1, 'days');
}

console.log(daysBetweenWithMoment('2023-10-01', '2023-10-10')); // 输出: 9