JS实现多少小时前，多少天前...

最近需要实现题目的功能，因为我的时间戳是PHP生成的，所以转换JS时间戳需要乘1000，废话不多说，看下面的代码把！

大家可以判断一下传进来的值是否为数值型，还有判断是否比当前的时间戳大！可以根据结果提示非法参数等等！

function getDateDiff(dateTimeStamp){
        var minute = 1000 * 60;
        var hour = minute * 60;
        var day = hour * 24;
        var halfamonth = day * 15;
        var month = day * 30;

        var now = new Date().getTime();
        var diffValue = now - dateTimeStamp;

        var monthC =diffValue/month;
        var weekC =diffValue/(7*day);
        var dayC =diffValue/day;
        var hourC =diffValue/hour;
        var minC =diffValue/minute;
        if(hourC>=12){
             result = "over";
         }
         else if(hourC>=1){
             result = parseInt(hourC) +"个小时前";
         }
         else if(minC>=1){
            result = parseInt(minC) +"分钟前";
         }else
             result = "刚刚发表";
        return result;
    }

    var time = getDateDiff('1466555123000');
    alert(time);