js 零点时间戳

function getMidnightTimestamp() {
    const now = new Date();
    const midnight = new Date(now.getFullYear(), now.getMonth(), now.getDate());
    return midnight.getTime(); // 返回毫秒级别的时间戳
}

console.log(getMidnightTimestamp()); // 输出当前日期的零点时间戳（毫秒）

function getMidnightTimestampInSeconds() {
    return Math.floor(getMidnightTimestamp() / 1000);
}

console.log(getMidnightTimestampInSeconds()); // 输出当前日期的零点时间戳（秒）

function daysBetweenMidnights(timestamp1, timestamp2) {
    const msPerDay = 24 * 60 * 60 * 1000; // 一天的毫秒数
    const diffInMs = Math.abs(timestamp2 - timestamp1); // 计算时间戳差值（绝对值）
    return Math.floor(diffInMs / msPerDay); // 转换为天数
}

const midnightToday = getMidnightTimestamp();
const midnightTomorrow = midnightToday + (24 * 60 * 60 * 1000); // 明天的零点时间戳

console.log(daysBetweenMidnights(midnightToday, midnightTomorrow)); // 输出1，表示相差一天