Daylight Savings Time Script

[Anfaenger]

I found the following script (freeware):

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("JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", 
			"SEPT", "OCT", "NOV", "DEC")
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 == "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 hr + ":" + min + " DST"
}
else{
if (region == "Greenwich") {
return monthArray[month] + " " + day + " " + year + ", " + hr + ":" + min + ":" + sec }
else { return hr + ":" + min }
}
}

 

It works fine but the daylight savings time is not correct. Can someone tell me how to fix it and what to change to display the correct DST?

 

Thank you