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 = "0" + 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 (dst == 1){
      hr -= -1
      if (hr >= 24){
      hr = hr-24
      day -= -1
      }
      if (hr < 10){
      hr = "0" + hr
      }
      if(day > monthDays[month]){
      day = 1
      if(month == 11){
      month = 0
      year -= -1
      }
      else{
      month -= -1
      }
      }
    return hr + ":" + min
    }
    else{
    return hr + ":" + min
    }
    }
    
    function worldClockZone(){
    document.getElementById("GMT").innerHTML = worldClock(0, "Greenwich")
    document.getElementById("London").innerHTML = worldClock(0, "Europe")
    document.getElementById("NewYork").innerHTML = worldClock(-5, "NAmerica")
    document.getElementById("Mauritius").innerHTML = worldClock(4, "Mauritius")
    
    setTimeout("worldClockZone()", 1000)
    }
    window.onload=worldClockZone;
    
    //-->