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function phpbb_switch_tz_date(keep_selection)
{
var timezone_groups = document.getElementById("timezone");
for (var i = 0; i < timezone_groups.childElementCount; i++) {
if (timezone_groups.children[i].tagName == "OPTGROUP" &&
timezone_groups.children[i].label != document.getElementById("tz_date").value)
{
timezone_groups.children[i].style.display = "none";
}
else if (timezone_groups.children[i].tagName == "OPTGROUP")
{
// Display other options
timezone_groups.children[i].style.display = "block";
}
}
if (typeof keep_selection !== 'undefined')
{
if (!keep_selection)
{
timezone_groups.children[0].selected = true;
}
}
}
function phpbb_enable_tz_dates()
{
var tz_select_date = document.getElementById("tz_select_date");
tz_select_date.style.display = "block";
}
function phpbb_preselect_tz_select(force_selector, l_suggestion)
{
var selector = document.getElementById('tz_date');
// 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)
{
if (selector.value && selector.value != option.value && !force_selector)
{
// We do not select the option for the user, but notify him,
// that we would suggest a different setting.
document.getElementById("tz_select_date_suggest").style.display = "inline";
document.getElementById("tz_select_date_suggest").title = l_suggestion.replace("%s", option.innerHTML);
document.getElementById("tz_select_date_suggest").innerHTML = l_suggestion.replace("%s", option.innerHTML.substring(0, 9));
phpbb_switch_tz_date(true);
}
else
{
// 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;
phpbb_switch_tz_date(!force_selector);
document.getElementById("tz_select_date_suggest").style.display = "none";
}
break;
}
}
}
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