How to calculate time for India

[Greg]

I am trying to calculate current time for India (+5:30 GMT). I am selecting
town in India from drop-down box with the value:

<option value="5"> Bangalore, India</option>

Can I get help for to change this function so 30 min will be added (clock
now shows only 5 hrs. difference. Thanks

function updateclock(z){
zone=z.options[z.selectedIndex].value;
isitlocal=(z.options[0].selected)?true:false;
}

function WorldClock(){
now=new Date();
ofst=now.getTimezoneOffset()/60;
secs=now.getSeconds();
sec=-1.57+Math.PI*secs/30;
mins=now.getMinutes();
min=-1.57+Math.PI*mins/30;
hr=(isitlocal)?now.getHours()now.getHours() + parseInt(ofst)) +
parseInt(zone);
hrs=-1.575+Math.PI*hr/6+Math.PI*parseInt(now.getMinutes())/360;
if (hr < 0) hr+=24;
if (hr > 23) hr-=24;
ampm = (hr > 11)?"PM":"AM";
statusampm = ampm.toLowerCase();

hr2 = hr;
if (hr2 == 0) hr2=12;
(hr2 < 13)?hr2:hr2 %= 12;
if (hr2<10) hr2="0"+hr2

var finaltime=hr2+':'+((mins < 10)?"0"+mins:mins)+':'+((secs <
10)?"0"+secs:secs)+' '+statusampm;