javascript - date and time (2) - Imporved Version

The javascript posted below outputs the local time where the computer or client is located. If it is in England, the local time will be the England's time. If it is in New York, it will show the New York's time. The script also outputs the time in Japan, Singapore, New York, San Francisco, and Hawaii. The data will be passed to HTML in the format formXxx.datesXxx.

The javascript library doesn't give the time in the different zone areas or Coordinated Universal Time (UTC). It does, however, provide the current local time, and the offset for the local zone. Use the object of Date() class and its member fuctions ot get these two data.

UTC = the current local time + local offset
the time in different zone area = UTC + its offset


<!--

function startClock(){

    // local time
    document.formLoc.datesLoc.value=getTimeAndDate(13);

    // san francisco time:  UTF-8
    var offsetSfo = -8;
    document.formSfo.datesSfo.value=getTimeAndDate(offsetSfo);
   
    // new york time:  UTF-5
    var offsetJfk = -5;
    document.formJfk.datesJfk.value=getTimeAndDate(offsetJfk);

    // hawaii time:  UTF-10
    var offsetHnl = -10;
    document.formHnl.datesHnl.value=getTimeAndDate(offsetHnl);    

    // japan time:  UTF+9
    var offsetKix = 9;
    document.formKix.datesKix.value=getTimeAndDate(offsetKix);

    // singapore time:  UTF+8
    var offsetSin = 8;
    document.formSin.datesSin.value=getTimeAndDate(offsetSin);
       
    /*  document.write(localTime);  */       
    /*  these debug stuff, cause the form outputs NOT to work.
        even one of these makes it fail to display
        the data in the form! */    

    setTimeout('startClock()',1000);
}

/*
 * returns the formatted time and data
 * for local time, set offset to 13
 */

function getTimeAndDate(offset){
    var mS;
    var time;

    // 1. get the local time
    var d=new Date();   

    // getTime() returns mS since 1970.01.01
    var localTime = d.getTime();

    // 2. find the local time offset  
    //    converting minutes to mS
    var localOffset=d.getTimezoneOffset()*60000;
   
    // 3. obtain UTC
    var utc = localTime + localOffset;
   
    if((offset<=12)&&(offset>=-12)){
        mS = utc + (3600000*offset); // converting mS to hours
        time = new Date(mS);        // new object       
    }
    else{
        time = new Date();          // new object for local 
    }
   
    var year=time.getFullYear();
    var month=time.getMonth();
    var day=time.getDay();
    var date=time.getDate();      
    var hour=time.getHours();
    var min=time.getMinutes();
    var sec=time.getSeconds();
    var ampm="  ";
    ampm=fixAmpm(hour);
    hour=fixHour(hour);
    min=fix0(min);
    sec=fix0(sec);
    date=fix0(date);
    day=fixDay(day);
    var time=
    (year+"."+month+"."+date+" "+day
    +"  "+hour+":"+min+":"+sec+" "+ampm);
    return time;
}
function fixAmpm(h){
    if (h>=12){
        ap="PM";
    }
    else{
        ap="AM";
    }
    return ap;
}
function fix0(n){
    if(n<10){
        n="0"+n;
    }
    return n;
}
function fixHour(h){
    if(h>=13){
        h-=12;
    }
    if(h==0){
        h=12;
    }
    if(h<10){
        h=fix0(h);
    }
    return h;
}
function fixDay(d){
    var dA;
    switch(d){
        case 0:
            dA="SUN";
            break;
        case 1:
            dA="MON";
            break;
        case 2:
            dA="TUE";
            break;
        case 3:
            dA="WED";
            break;
        case 4:
            dA="THR";
            break;
        case 5:
            dA="FRI";
            break;
        case 6:
            dA="SAT"
            break;
        default:
            dA="error";
    }
    return dA;
}

-->