JavaScript Tutorial/Date/getTimezoneOffset

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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.

<title>Determine Time Zone</title>
<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");

Display the timezone offsets for two different dates

    <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.");