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<script> function displayTime(){ var h = new Date().getHours(); var m = new Date().getMinutes() var s =...

<script>
function displayTime(){
var h = new Date().getHours();
var m = new Date().getMinutes()
var s = new Date().getSeconds()
var ha = h * (360/12) + (m*.5);
var ma = m * (360/60)
var sa = s * (360/60);

document.getElementById("sec").style.transform = 'translate(150px) rotate(' + sa + 'deg)'
document.getElementById("min").style.transform = 'translate(150px,20px) rotate(' + ma + 'deg)'
document.getElementById("hour").style.transform = 'translate(150px,50px) rotate(' + ha + 'deg)'
}
function start(){
displayTime();
setInterval("displayTime()", 1000);
}
</script>
</head>

<body onload='start()'>
<select name="DropDownTimezone" id="DropDownTimezone">
<option value="default">You are here</option>
<option value="-12.0">(GMT -12:00) Eniwetok, Kwajalein</option>
<option value="-11.0">(GMT -11:00) Midway Island, Samoa</option>
<option value="-10.0">(GMT -10:00) Hawaii</option>
<option value="-9.0">(GMT -9:00) Alaska</option> </select>

I have this html and java script code. This webpage gives user to select different timezone and displays that time in a analog clock. I just want to know how to use getTimezoneOffset() to make this dropdown menu functional. I would really appreciate if someone could help me. Thank you.

engineering   Computer-Science   
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Homework Answers

Answer #1

The client’s timezone offset could be detected by using the Date object’s getTimezoneOffset() method.

The getTimezoneOffset() method returns the time difference between UTC time and local time, that is the time offset, in minutes. This offset is changed by dividing by 60 and negating the result.

below function will return the getTimeZone()

<input type="text" name="result" id="result" value="">

<select name="timezone" onChange="calcTime(this.value)">

<script language="JavaScript">
function calcTime(offset) 
{
    d = new Date();
    utc = d.getTime() + (d.getTimezoneOffset() * 60000);
    nd = new Date(utc + (3600000*offset));
    document.getElementById('result').value=nd.toLocaleString();
}      
</script>
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