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);