获取时间偏移的js ，如2天前，23小时前，59分钟前，刚刚，59秒前，MM-DD ， YY-MM-DD ，以时间最短可读计算。

getDateTimeStamp.js

/* dateStr 的格式为'2018-11-25 16:14:24' */

function getDateDiff(dateStr) {
    var publishTime = getDateTimeStamp(dateStr) / 1000,
    d_seconds,
    d_minutes,
    d_hours,
    d_days,
    timeNow = parseInt(new Date().getTime() / 1000),
    d,

    date = new Date(publishTime * 1000),
    Y = date.getFullYear(),
    M = date.getMonth() + 1,
    D = date.getDate(),
    H = date.getHours(),
    m = date.getMinutes(),
    s = date.getSeconds();
    //小于10的在前面补0
    if (M < 10) {
            M = '0' + M;
    }
    if (D < 10) {
            D = '0' + D;
    }
    if (H < 10) {
            H = '0' + H;
    }
    if (m < 10) {
            m = '0' + m;
    }
    if (s < 10) {
            s = '0' + s;
    }

    d = timeNow - publishTime;
    d_days = parseInt(d / 86400);
    d_hours = parseInt(d / 3600);
    d_minutes = parseInt(d / 60);
    d_seconds = parseInt(d);

    if (d_days > 0 && d_days < 3) {
            return d_days + '天前';
    } else if (d_days <= 0 && d_hours > 0) {
            return d_hours + '小时前';
    } else if (d_hours <= 0 && d_minutes > 0) {
            return d_minutes + '分钟前';
    } else if (d_seconds < 60) {
            if (d_seconds <= 0) {
                    return '刚刚';
            } else {
                    return d_seconds + '秒前';
            }
    } else if (d_days >= 3 && d_days < 30) {
            return M + '-' + D;
    } else if (d_days >= 30) {
            return Y + '-' + M + '-' + D;
    }
}

function getDateTimeStamp(dateStr) {
    return Date.parse(dateStr.replace(/-/gi, "/"));
}