js计算时间差以个性化显示日期时间

var minute = 1000 * 60;
var hour = minute * 60;
var day = hour * 24;
var halfamonth = day * 15;
var month = day * 30;
 
function getdatediff(dateTimeStamp){
var now = new Date().getTime();
var diffValue = now - dateTimeStamp;
 
if(diffValue < 0){
   //非法操作
   //alert("结束日期不能小于开始日期！");
}
 
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="发表于" + parseInt(monthC) + "个月前";
 }
 else if(weekC>=1){
    result="发表于" + parseInt(weekC) + "个星期前";
 }
 else if(dayC>=1){
    result="发表于"+ parseInt(dayC) +"天前";
 }
 else if(hourC>=1){
    result="发表于"+ parseInt(hourC) +"个小时前";
 }
 else if(minC>=1){
    result="发表于"+ parseInt(minC) +"分钟前";
 }else
   result="刚刚发表";
   return result;
}