How to pass a javascript variable to PHP without using $_GET?
If you don't want to use a GET request, you could consider using a POST request instead. You can send the data from with an Ajax request in JavaScript. Using jQuery, this would look something like:
$.ajax({ 'url': 'PATH_TO_PHP_SCRIPT', 'type': 'POST', 'data': 'timezone=' + timezoneVariable});
If you don't want to use JSON and ajax(XMLHttpRequest), you can use cookies. Since both javascript and php can read these, create one using javascript to store the timezone . Then in your php code read that cookie.
to create a cookie in javascript use :
document.cookie = 'myName=' + value + '; expires=' + now.toGMTString() + '; path=/';and to read it in your php :
$_COOKIE['myName']
You can simply GET/POST an URL like /tz/TIME_ZONE where TIME_ZONE is whatever timezone you want to set.