JS时间转时间戳，时间戳转时间。时间显示模式。

函数内容

// 时间转为时间戳
function date2timestamp(datetime) {
    var timestamp = new Date(Date.parse(datetime));
    timestamp = timestamp.getTime();
    timestamp = timestamp / 1000;
    return timestamp;
}

// 时间戳转时间
function timestamp2date(timestamp, mode) {
    var tt = new Date(parseInt(timestamp) * 1000).toLocaleString().replace(/:\d{1,2}$/, ' ').replace(/年|月/g, "-").replace(/日/g, " ").replace(/上午/g, "").replace(/下午/g, "");
    var date_arr = tt.split(" ");

    if (mode == 3) {
        var minute = 60;
        var hour = minute * 60;
        var day = hour * 24;
        var halfamonth = day * 15;
        var month = day * 30;
        var current_timestamp = parseInt(Date.parse(new Date()) / 1000);
        var diffValue = current_timestamp - timestamp;
        var monthC = diffValue / month;
        var weekC = diffValue / (7 * day);
        var dayC = diffValue / day;
        var hourC = diffValue / hour;
        var minC = diffValue / minute;
        if (monthC >= 1) {
            result = parseInt(monthC) + "月前";
        }
        else if (weekC >= 1) {
            result = parseInt(weekC) + "周前";
        }
        else if (dayC >= 1) {
            result = parseInt(dayC) + "天前";
        }
        else if (hourC >= 1) {
            result = parseInt(hourC) + "小时前";
        }
        else if (minC >= 1) {
            result = parseInt(minC) + "分钟前";
        } else
            result = "刚刚";
        return result;
    }

    if (mode == 2) {
        var current_timestamp = parseInt(Date.parse(new Date()) / 1000);
        if ((current_timestamp - timestamp) > 7 * 24 * 60 * 60) {
            // 一周之前，显示日期
            return date_arr[0];
        } else {
            var d = new Date();
            var date = d.getFullYear() + "/" + (d.getMonth() + 1) + "/" + d.getDate();
            var b_date = date2timestamp(date + " 00:00:00");
            var e_date = date2timestamp(date + " 23:59:59");

            if (parseInt(timestamp) > parseInt(b_date) && parseInt(timestamp) < parseInt(e_date)) {
                // 今天,只显示时间
                return date_arr[1];
            }

            if (parseInt(timestamp) > parseInt(b_date - 24 * 60 * 60) && parseInt(timestamp) < parseInt(e_date - 24 * 60 * 60)) {
                // 昨天，显示昨天
                return "昨天";
            }

            // 显示周几
            var days = new Array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
            var day  = new Date(date_arr[0]).getDay();
            return days[day];
        }
    }

    if (mode == 1) {
        // 如果是当天，就不显示日期
        var d = new Date();
        var date = d.getFullYear() + "/" + (d.getMonth() + 1) + "/" + d.getDate();
        var b_date = date2timestamp(date + " 00:00:00");
        var e_date = date2timestamp(date + " 23:59:59");

        if (parseInt(timestamp) > parseInt(b_date) && parseInt(timestamp) < parseInt(e_date)) {
            return date_arr[1];
        }
        return tt;
    }

    return tt;
}

// 1498806947 2017.6.30 15:15

// 1498720547 2017.6.29 15:15

// 1498634147 2017.6.28 15:15

// 1497942947 2017.6.20 15:15

console.log(timestamp2date('1498806947', 3));
console.log(timestamp2date('1498720547', 3));
console.log(timestamp2date('1498634147', 3));
console.log(timestamp2date('1497942947', 3));

console.log("-------------------------------");

console.log(timestamp2date('1498806947', 2));
console.log(timestamp2date('1498720547', 2));
console.log(timestamp2date('1498634147', 2));
console.log(timestamp2date('1497942947', 2));

console.log("-------------------------------");

console.log(timestamp2date('1498806947', 1));
console.log(timestamp2date('1498720547', 1));
console.log(timestamp2date('1498634147', 1));
console.log(timestamp2date('1497942947', 1));

console.log("-------------------------------");

console.log(timestamp2date('1498806947'));
console.log(timestamp2date('1498720547'));
console.log(timestamp2date('1498634147'));
console.log(timestamp2date('1497942947'));

执行结果

1小时前
1天前
2天前
1周前
-------------------------------
15:15
昨天
星期三
2017-06-20
-------------------------------
15:15
2017-06-29 15:15
2017-06-28 15:15
2017-06-20 15:15
-------------------------------
2017-06-30 15:15
2017-06-29 15:15
2017-06-28 15:15
2017-06-20 15:15

小结

JS对于时间戳处理不太便捷。需要自己计算处理。根据需要，显示不同的时间模式。