JavaScript Tutorial/Date/getTimezoneOffset
Date().getTimezoneOffset()
The getTimezoneOffset() method returns the difference between the time zones of local time and Greenwich Mean Time (GMT).
This difference is returned as an integer.
Although this is a method of a Date object, the actual date and time associated with the date is irrelevant because the time zone difference is based on the environment settings.
<html>
<head>
<title>Determine Time Zone</title>
</head>
<body>
<script language="JavaScript" type="text/javascript">
<!--
var current_date = new Date();
var current_timezone = current_date.getTimezoneOffset();
document.write("Your time zone is " + current_timezone + " minutes from GMT");
//-->
</script>
</body>
</html>
Display the timezone offsets for two different dates
<html>
<script language="JavaScript">
<!--
//Create 2 very different date objects
aDate1 = new Date(1990,1,1,0,0,0,0);
aDate2 = new Date(1994,2,13,8,24,45,300);
//
document.write("The timezone offset of aDate1 is ");
document.write(aDate1.getTimezoneOffset()," minutes.<br>");
document.write("The timezone offset of aDate2 is "
document.write(aDate2.getTimezoneOffset()," minutes.");
-->
</script>
</html>