28     ## timezone-autodetect

    29     % if prefs and prefs.is_default('timezone') :

    30         <script language="Javascript" type="text/javascript">

    31 /*

    32  * Set a preference cookie

    33  */

    34 function set_pref (name, value) {

    35     // XXX: expire?

    36     document.cookie = (name + "=" + value + "; path=/");

    37 }

    38 

    39 /*

    40  * Set the timezone_offset cookie to the current Date's timezone offset

    41  */

    42 function autodetect_tz_offset () {

    43     // current datetime

    44     var now = new Date();

    45 

    46     // timezone offset from UTC in minutes

    47     var timezone_offset = -now.getTimezoneOffset()

    48     

    49     // store cookie with offset in minutes

    50     set_pref('timezone_offset', timezone_offset);

    51 }

    52 

    53 /*

    54  * Autodetect at load

    55  */

    56 window.onload = autodetect_tz_offset;

    57         </script>

    58     % endif