function worldClock(zone, region){
var dst = 0;
var time = new Date();
var gmtMS = time.getTime() + (time.getTimezoneOffset() * 60000);
var gmtTime = new Date(gmtMS);
var day = gmtTime.getDate();
var month = gmtTime.getMonth();
var year = gmtTime.getYear();
if(year < 1000){
year += 1900;
}
var monthArray = new Array("January", "February", "March", "April", "May", "June", "July", "August", 
				"September", "October", "November", "December");
var monthDays = new Array("31", "28", "31", "30", "31", "30", "31", "31", "30", "31", "30", "31");
if (year%4 == 0){
monthDays = new Array("31", "29", "31", "30", "31", "30", "31", "31", "30", "31", "30", "31");
}
if(year%100 == 0 && year%400 != 0){
monthDays = new Array("31", "28", "31", "30", "31", "30", "31", "31", "30", "31", "30", "31");
}

var hr = gmtTime.getHours() + zone;
var min = gmtTime.getMinutes();
var sec = gmtTime.getSeconds();

if (hr >= 24){
hr = hr-24;
day -= -1;
}
if (hr < 0){
hr -= -24;
day -= 1;
}
if (hr < 10){
hr = " " + hr;
}
if (min < 10){
min = "0" + min;
}
if (sec < 10){
sec = "0" + sec;
}
if (day <= 0){
if (month == 0){
	month = 11;
	year -= 1;
	}
	else{
	month = month -1;
	}
day = monthDays[month];
}
if(day > monthDays[month]){
	day = 1;
	if(month == 11){
	month = 0;
	year -= -1;
	}
	else{
	month -= -1;
	}
}
if (region == "NAmerica"){
	var startDST = new Date();
	var endDST = new Date();
	startDST.setMonth(3);
	startDST.setHours(2);
	startDST.setDate(1);
	var dayDST = startDST.getDay();
	if (dayDST != 0){
		startDST.setDate(8-dayDST);
		}
		else{
		startDST.setDate(1);
		}
	endDST.setMonth(9);
	endDST.setHours(1);
	endDST.setDate(31);
	dayDST = endDST.getDay();
	endDST.setDate(31-dayDST);
	var currentTime = new Date();
	currentTime.setMonth(month);
	currentTime.setYear(year);
	currentTime.setDate(day);
	currentTime.setHours(hr);
	if(currentTime >= startDST && currentTime < endDST){
		dst = 1;
		}
}
if (region == "Europe"){
	var startDST = new Date();
	var endDST = new Date();
	startDST.setMonth(2);
	startDST.setHours(1);
	startDST.setDate(31);
	var dayDST = startDST.getDay();
	startDST.setDate(31-dayDST);
	endDST.setMonth(9);
	endDST.setHours(0);
	endDST.setDate(31);
	dayDST = endDST.getDay();
	endDST.setDate(31-dayDST);
	var currentTime = new Date();
	currentTime.setMonth(month);
	currentTime.setYear(year);
	currentTime.setDate(day);
	currentTime.setHours(hr);
	if(currentTime >= startDST && currentTime < endDST){
		dst = 1;
		}
}

if (region == "SAmerica"){
	var startDST = new Date();
	var endDST = new Date();
	startDST.setMonth(9);
	startDST.setHours(0);
	startDST.setDate(1);
	var dayDST = startDST.getDay();
	if (dayDST != 0){
		startDST.setDate(22-dayDST);
		}
		else{
		startDST.setDate(15);
		}
	endDST.setMonth(1);
	endDST.setHours(11);
	endDST.setDate(1);
	dayDST = endDST.getDay();
	if (dayDST != 0){
		endDST.setDate(21-dayDST);
		}
		else{
		endDST.setDate(14);
		}
	var currentTime = new Date();
	currentTime.setMonth(month);
	currentTime.setYear(year);
	currentTime.setDate(day);
	currentTime.setHours(hr);
	if(currentTime >= startDST || currentTime < endDST){
		dst = 1;
		}
}
if (region == "Israel"){
	var startDST = new Date();
	var endDST = new Date();
	startDST.setMonth(3);
	startDST.setHours(2);
	startDST.setDate(1);
	endDST.setMonth(8);
	endDST.setHours(2);
	endDST.setDate(25);
	dayDST = endDST.getDay();
	if (dayDST != 0){
	endDST.setDate(32-dayDST);
	}
	else{
	endDST.setDate(1);
	endDST.setMonth(9);
	}
	var currentTime = new Date();
	currentTime.setMonth(month);
	currentTime.setYear(year);
	currentTime.setDate(day);
	currentTime.setHours(hr);
	if(currentTime >= startDST && currentTime < endDST){
		dst = 1;
		}
}
if (region == "Australia"){
	var startDST = new Date();
	var endDST = new Date();
	startDST.setMonth(9);
	startDST.setHours(2);
	startDST.setDate(31);
	var dayDST = startDST.getDay();
	startDST.setDate(31-dayDST);
	endDST.setMonth(2);
	endDST.setHours(2);
	endDST.setDate(31);
	dayDST = endDST.getDay();
	endDST.setDate(31-dayDST);
	var currentTime = new Date();
	currentTime.setMonth(month);
	currentTime.setYear(year);
	currentTime.setDate(day);
	currentTime.setHours(hr);
	if(currentTime >= startDST || currentTime < endDST){
		dst = 1;
		}
}

	
if (dst == 1){
	hr -= -1;
	if (hr >= 24){
	hr = hr-24;
	day -= -1;
	}
	if (hr < 10){
	hr = " " + hr;
	}
	if(day > monthDays[month]){
	day = 1;
	if(month == 11){
	month = 0;
	year -= -1;
	}
	else{
	month -= -1;
	}
	}
  //return monthArray[month] + " " + day + ", " + year + "<br>" + hr + ":" + min + ":" + sec + " DST";
  return hr + ":" + min;
}
else{
//return monthArray[month] + " " + day + ", " + year + "<br>" + hr + ":" + min + ":" + sec;
return hr + ":" + min ;
}
}

function worldClockZone(){
document.getElementById("GMT").innerHTML = worldClock(0, "Greenwich");
document.getElementById("NewYork").innerHTML = worldClock(-5, "NAmerica");
document.getElementById("Paris").innerHTML = worldClock(1, "Europe");
document.getElementById("Tokyo").innerHTML = worldClock(9, "Tokyo");
document.getElementById("Jerusalem").innerHTML = worldClock(2, "Israel");
document.getElementById("HongKong").innerHTML = worldClock(8, "HongKong");
document.getElementById("Sydney").innerHTML = worldClock(10, "Australia")


setTimeout("worldClockZone()", 1000);
}