js 累加日期以及追加小时

//追加日期
 function addDay(dates,num)
 { 
    var   d=new   Date(dates.replace(/-/g,"/")); 
    d.setDate(d.getDate()+num); 
    var tempday=d.getDate();
    var tempmonth=(1+d.getMonth());

    if(tempday.toString().length==1)
        tempday="0"+tempday;
    if(tempmonth.toString().length==1)
        tempmonth="0"+tempmonth;
    return   d.getFullYear()+ "-"+tempmonth+ "-"+tempday; 
 }
  //追加小时
 function addHour(dates,num)
 { 
    var   d=new   Date(dates.replace(/-/g,"/")); 
    d.setHours(d.getHours()+num); 
    var tempday=d.getDate();
    var tempmonth=(1+d.getMonth());
    var temphour=d.getHours();
    var tempmin=d.getMinutes();

    if(tempday.toString().length==1)
        tempday="0"+tempday;
    if(tempmonth.toString().length==1)
        tempmonth="0"+tempmonth;
    if(temphour.toString().length==1)
        temphour="0"+temphour;
    if(tempmin.toString().length==1)
        tempmin="0"+tempmin;
     return   d.getFullYear()+ "-"+tempmonth+ "-"+tempday+" "+temphour+":"+tempmin; 
 }