js12 hours convert code

function f2(){

    d=new Date();

    hours=d.getHours();//24

    min=d.getMinutes();

    sec=d.getSeconds();

    ampm="am";

    // if(hours>12){

    //     hours=hours%12;

    //     if(hours==0){

    //         hours=12;

    //     }

    //     ampm="pm";

    // }

    // if(min<10){

    //     min='0'+min;

    // }

    // if(sec<10){

    //     sec='0'+sec;

    // }

    ampm=hours>=12?'pm':'am';

hours=hours%12;

hours=hours?hours:12;

min=min<10?'0'+min:min;

sec=sec<10?'0'+sec:sec;

    d1=hours+":"+min+":"+sec+""+ampm;

    //console.log(d1);

    document.getElementById('a').innerHTML=d1;

}