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function phpbb_preselect_tz_select()
{
var selector = document.getElementsByClassName('tz_select')[0];
if (selector.value)
{
return;
}
// The offset returned here is in minutes and negated.
// http://www.w3schools.com/jsref/jsref_getTimezoneOffset.asp
var offset = (new Date()).getTimezoneOffset();
if (offset < 0)
{
var sign = '+';
offset = -offset;
}
else
{
var sign = '-';
}
var minutes = offset % 60;
var hours = (offset - minutes) / 60;
if (hours < 10)
{
hours = '0' + hours.toString();
}
else
{
hours = hours.toString();
}
if (minutes < 10)
{
minutes = '0' + minutes.toString();
}
else
{
minutes = minutes.toString();
}
var prefix = 'GMT' + sign + hours + ':' + minutes;
var prefix_length = prefix.length;
for (var i = 0; i < selector.options.length; ++i)
{
var option = selector.options[i];
if (option.value.substring(0, prefix_length) == prefix)
{
// Firefox scrolls the selector only to put the option into view;
// for negative-offset timezones, this means the first timezone
// of a particular offset will be the bottom one, and selected,
// with all other timezones not visible. Not much can be done
// about that here unfortunately.
option.selected = true;
break;
}
}
}
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