Determine a User's Timezone Is there any standard way for a Web Server to be able to determine a user's timezone within a web page? Perhaps from a HTTP header or part of the user-agent string? Answer: timezone.js: function ajaxpage() { var url = "timezone.php"; var visitortime = new Date(); var 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");