Javascript и Timezone

[CaTaHuK]

Здравейте. Искам в javascript да мога сам да настройвам timezoe.
Ето го и кода

[js]window.addEvent('domready', function(){
var update_date = function () {
var tDate = new Date();
var hours = tDate.getHours();
var minutes = tDate.getMinutes();
var seconds = tDate.getSeconds();
var calc = ((minutes*5)/60).toInt();
$('hours').set('text',((hours%12)*5)+calc);
$('minutes').set('text',":"+minutes);
$('seconds').set('text',":"+seconds);
$('seconds').set('styles',{
'background-position': '-' + seconds + '00px -200px'
});
$('minutes').set('styles',{
'background-position': '-' + minutes + '00px -100px'
});
$('hours').set('styles',{
'background-position': '-' + (((hours%12)*5)+calc) + '00px 0'
});
};
update_date();
update_date.periodical(1000);

});[/js]