HTML - How can I determine a web user's time zone?

Is there a standard way for a web server to determine what time zone offset a user is in?
From an HTTP header or part of the user-agent description, perhaps?

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Question by (8/1/2008 12:42:38 AM)

Answer

timezone.js:

function ajaxpage(){
    var url = "timezone.php";
    var visitortime = new Date();
    vat time = visitortime.getTimezoneOffset()/60;
    var page_request = false
    if (window.XMLHttpRequest)
            page_request = new XMLHttpRequest()
    else if (window.ActiveXObject){ 
            try {
                    page_request = new ActiveXObject("Msxml2.XMLHTTP")
            } catch (e){
                    try{
                            page_request = new ActiveXObject("Microsoft.XMLHTTP")
                    } catch (e) {}
            }
    } else
            return false

    page_request.onreadystatechange=function() {
            loadpage(page_request, containerid)
    }

    if (bustcachevar)
            bustcacheparameter=(url.indexOf("?")!=-1) ? "&"+new Date().getTime() : "?"+new Date().getTime()

    page_request.open('GET', url+bustcacheparameter+"&time="+time, true)
    page_request.send(null) }


function loadpage(page_request, containerid){
    if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1))
            document.write('<meta http-equiv="refresh" content="0;url=http://example.com/"/>');
}

timezone.php:

<?php
session_start();
$_SESSION['time'] = $_GET['time'];
?>

When you want to use it add onLoad="ajaxpage();" to the body tag and it should cause the timezone to be stored in the PHP session variable $_SESSION['time']

Edit: P.S. This is untested.

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Related Topics  html  browser  time  timezone
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